Control: reassign -1 mesa-va-drivers 20.3.5-1 On 2022-02-19 18:38:32 +0100, Francesco Muzio wrote: > gdb stack trace of the crash: > > Thread 25 "vlc" received signal SIGSEGV, Segmentation fault. > [Switching to Thread 0x7fffbc7fb700 (LWP 9949)] > 0x00007fffab507cb3in ??() from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so > (gdb) bt > #0 0x00007fffab507cb3in () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so > #1 0x00007fffab4d7f09in () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so > #2 0x00007fffab4d6221in () at /usr/lib/x86_64-linux-gnu/dri/r600_dri.so > #3 0x00007fff7b5a14c5in () at > /usr/lib/x86_64-linux-gnu/dri/r600_drv_video.so > #4 0x00007fffa0473adfin vaEndPicture() at > /usr/lib/x86_64-linux-gnu/libva.so.2 > #5 0x00007fff831757c8in () at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #6 0x00007fff83185c6ein () at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #7 0x00007fff82f9dfcain () at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #8 0x00007fff82f9e70din () at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #9 0x00007fff82ca92bbin () at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #10 0x00007fff82ca9db8in avcodec_send_packet() > at /usr/lib/x86_64-linux-gnu/libavcodec.so.58 > #11 0x00007fffbc20966cin () > at /usr/lib/x86_64-linux-gnu/vlc/plugins/codec/libavcodec_plugin.so > #12 0x00007ffff7cb01c8in () at /usr/lib/x86_64-linux-gnu/libvlccore.so.9 > #13 0x00007ffff7cafdf5in () at /usr/lib/x86_64-linux-gnu/libvlccore.so.9 > #14 0x00007ffff7cb0412in () at /usr/lib/x86_64-linux-gnu/libvlccore.so.9 > #15 0x00007ffff7f44ea7in start_thread(arg=<optimized out>) at > pthread_create.c:477 > #16 0x00007ffff7e6edefin clone() at > ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 > > > The crash seems a curious combination between a (probably) not perfect > signal reception, libvlc and the driver/hardware video. > It not happens on another machine with same debian release, same > architecture and same radeon driver video (but different GPU) > It not happens if I disable HW decoding on VLC > > with HW decoding enabled, when VLC start playing, shows me this message: > [00007f91d0c0b170] avcodec decoder: Using Mesa Gallium driver 20.3.5 for AMD > RS880 (DRM 2.50.0 / 5.10.0-11-amd64, LLVM 11.0.1) for hardware decoding So this sounds a lot like a bug in the vaapi driver for that GPU. Especially since playing without hardware decoding works as expected. Reassigning accordingly. Cheers > > when VLC segfaults I see these messages in dmesg logs > [ 9647.012821] vlc[7168]: segfault at 30 ip 00007fe06b0ffcb3 sp > 00007fe06846d738 error 4 in r600_dri.so[7fe06a6a5000+d47000] > [ 9647.012857] Code: 1f 84 00 00 00 00 00 48 8b 46 30 ff 60 10 66 0f 1f 84 > 00 00 00 00 00 48 8b 06 48 8b 40 30 ff 60 18 66 0f 1f 44 00 00 48 8b 06 <48> > 8b 40 30 ff 60 20 66 0f 1f 44 00 00 41 57 41 56 41 55 41 54 55 > > so, as a workaround, I use --avcodec-hw none to VLC (or settings > VDPAU_DRIVER=none LIBVA_DRIVER_NAME=none for other software using libvlc) to > avoid the crash > -- Sebastian Ramacher
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