Control: forwarded -1 https://code.ffmpeg.org/FFmpeg/FFmpeg/issues/21756
On 2026-02-13 23:54:51 +0100, Joachim Bauch wrote: > Package: ffmpeg > Version: 7:8.0.1-3+b1 > Severity: normal > X-Debbugs-Cc: [email protected] > User: [email protected] > Usertags: loong64 > Control: block 1127385 by -1 > > Dear Maintainer, > > ffmpeg segfaults in "buffer_pool_flush" when called from the kvazaar test > "test_invalid_input.sh" (see #1127385). Forwarded upstream. Cheers > > These are information to reproduce and some of my first findings. > > Command: > ffmpeg -f lavfi -i mandelbrot=size=1x65 -vframes 1 -pix_fmt yuv420p -f > yuv4mpegpipe /tmp/tmp.TfM9llmcRd > > Output (tested in virtual machine to reproduce issue from buildd): > ---------- > ffmpeg version 8.0.1-3+b1 Copyright (c) 2000-2025 the FFmpeg developers > built with gcc 15 (Debian 15.2.0-12) > configuration: --prefix=/usr --extra-version=3+b1 --toolchain=hardened > --libdir=/usr/lib/loongarch64-linux-gnu > --incdir=/usr/include/loongarch64-linux-gnu --arch=loong64 --enable-gpl > --disable-stripping --disable-pocketsphinx --disable-libcaca --disable-libmfx > --disable-omx --enable-gnutls --enable-libaom --enable-libass > --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d > --enable-libflite --enable-libfontconfig --enable-libfreetype > --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm > --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa > --enable-libopenjpeg --enable-libopenmpt --enable-libopus > --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr > --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab > --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 > --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal > --enable-opencl --enable-opengl --disable-sndio --disable-libvpl > --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint > --enable-frei0r --enable-ladspa --enable-libbluray --enable-libdvdnav > --enable-libdvdread --enable-libjack --enable-libjxl --enable-libpulse > --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh > --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi > --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e > --enable-librsvg --enable-shared > libavutil 60. 8.100 / 60. 8.100 > libavcodec 62. 11.100 / 62. 11.100 > libavformat 62. 3.100 / 62. 3.100 > libavdevice 62. 1.100 / 62. 1.100 > libavfilter 11. 4.100 / 11. 4.100 > libswscale 9. 1.100 / 9. 1.100 > libswresample 6. 1.100 / 6. 1.100 > Input #0, lavfi, from 'mandelbrot=size=1x65': > Duration: N/A, start: 0.000000, bitrate: N/A > Stream #0:0: Video: wrapped_avframe, rgb0, 1x65 [SAR 1:1 DAR 1:65], 25 fps, > 25 tbr, 25 tbn > Stream mapping: > Stream #0:0 -> #0:0 (wrapped_avframe (native) -> wrapped_avframe (native)) > Press [q] to stop, [?] for help > Output #0, yuv4mpegpipe, to '/tmp/tmp.TfM9llmcRd': > Metadata: > encoder : Lavf62.3.100 > Stream #0:0: Video: wrapped_avframe, yuv420p(progressive), 1x65 [SAR 1:1 > DAR 1:65], q=2-31, 200 kb/s, 25 fps, 25 tbn > Metadata: > encoder : Lavc62.11.100 wrapped_avframe > qemu: uncaught target signal 11 (Segmentation fault) - core dumped > Segmentation fault (core dumped) > ---------- > > I attached a remote gdb and got this stack trace: > ---------- > Thread 2 received signal SIGSEGV, Segmentation fault. > [Switching to Thread 92632.92650] > 0x00007fd9d8e509a4 in ?? () from > target:/usr/lib/loongarch64-linux-gnu/libc.so.6 > (gdb) bt > #0 0x00007fd9d8e509a4 in ?? () from > target:/usr/lib/loongarch64-linux-gnu/libc.so.6 > #1 0x00007fd9d8e50c7c in ?? () from > target:/usr/lib/loongarch64-linux-gnu/libc.so.6 > #2 0x00007fd9c90fc9dc in buffer_pool_flush (pool=0x7fd9ac0021e0) at > src/libavutil/buffer.c:308 > #3 av_buffer_pool_uninit (ppool=<optimized out>) at > src/libavutil/buffer.c:338 > #4 0x00007fd9d982359c in ff_frame_pool_uninit (pool=<optimized out>) at > src/libavfilter/framepool.c:291 > #5 ff_frame_pool_uninit (pool=0x7fd9ac002d78) at > src/libavfilter/framepool.c:283 > #6 0x00007fd9d97f2bf4 in link_free (link=0x7fd9bc8433f8) at > src/libavfilter/avfilter.c:207 > #7 free_link (link=<optimized out>) at src/libavfilter/avfilter.c:791 > #8 0x00007fd9d97f46d0 in avfilter_free (filter=0x7fd9ac002880) at > src/libavfilter/avfilter.c:815 > #9 0x00007fd9d97f757c in avfilter_graph_free (graphp=0x7fd9bc8434c8) at > src/libavfilter/avfiltergraph.c:128 > #10 0x00007fd9dad81768 in ?? () > #11 0x00007fd9dad94488 in ?? () > #12 0x00007fd9d8e3e504 in ?? () from > target:/usr/lib/loongarch64-linux-gnu/libc.so.6 > #13 0x00007fd9d8ebb350 in ?? () from > target:/usr/lib/loongarch64-linux-gnu/libc.so.6 > (gdb) f 2 > #2 0x00007fd9c90fc9dc in buffer_pool_flush (pool=0x7fd9ac0021e0) at > src/libavutil/buffer.c:308 > 308 in src/libavutil/buffer.c > (gdb) p *buf > $1 = {data = 0x7fd9ac07e0e0 "\244", opaque = 0x0, free = 0x7fd9c90fbdc0 > <av_buffer_default_free>, pool = 0x7fd9ac0021e0, next = 0x7fd9ac011660, > buffer = { > data = 0x0, size = 0, refcount = 0, free = 0x0, opaque = 0x0, flags = 0, > flags_internal = 0}} > ---------- > > Thanks, > Joachim > > > -- System Information: > Debian Release: forky/sid > APT prefers unstable-debug > APT policy: (500, 'unstable-debug'), (500, 'unstable') > Architecture: loong64 (loongarch64) > > Kernel: Linux 5.19.0 (SMP w/4 CPU threads) > Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set > Shell: /bin/sh linked to /usr/bin/dash > Init: unable to detect > > Versions of packages ffmpeg depends on: > ii libavcodec62 7:8.0.1-3+b1 > ii libavdevice62 7:8.0.1-3+b1 > ii libavfilter11 7:8.0.1-3+b1 > ii libavformat62 7:8.0.1-3+b1 > ii libavutil60 7:8.0.1-3+b1 > ii libc6 2.42-13 > ii libplacebo351 7.351.0-2+b1 > ii libsdl2-2.0-0 2.32.10+dfsg-6+b1 > ii libswresample6 7:8.0.1-3+b1 > ii libswscale9 7:8.0.1-3+b1 > ii zlib1g 1:1.3.dfsg+really1.3.1-2 > > ffmpeg recommends no packages. > > Versions of packages ffmpeg suggests: > pn ffmpeg-doc <none> > > -- no debconf information -- Sebastian Ramacher
