Source: ffmpeg Version: 7:3.3.3-3 Severity: important Control: found -1 7:3.2.4-1 Control: affects -1 src:winff
Hi, Just noticed that winff's autopkgtests fail on armhf because ffmpeg receives a SIGBUS. The failing command is: > /usr/bin/ffmpeg -i test.avi -vcodec flv -f flv -r 29.97 -vf scale=w=320:h=240 > -aspect 4:3 -b:v 300k -g 160 -cmp dct -subcmp dct -mbd 2 -flags +aic+mv0+mv4 > -trellis 1 -ac 1 -ar 22050 -b:a 56k -y -t 1 test.flv Where test.avi can be obtained from the winff source package: https://sources.debian.net/src/winff/1.5.5-1/debian/tests/test.avi/ Backtrace: > (gdb) bt > #0 ff_diff_pixels_armv6 () at src/libavcodec/arm/pixblockdsp_armv6.S:46 > #1 0xf6540fe8 in dct_sad8x8_c (h=8, stride=352, > src2=0xaacf377f > "ddefhiiihllllmmmnllllllllnnoopqqruuuvvvwwyyz{{|}}\200\200\201\201\202\203\203\203\202\202\202\203\203\203\204\204\206\205\205\204\204\203\203\203\200\201\201\201\201\202\202\202\206\206\206\206\206\206\206\206\210\212\215\220\222\222\221\220\220\220\220\221\221\222\222\222\223\223\224\225\225\226\226\227\235\235\236\236\236", > '\237' <repeats 13 times>, > "\240\240\241\241\242\242\243\243\243\244\245\245\246\246\247\250\250\251\251\252\252\253\251\251\252\252\252\253\253\253\255\255\255\255\255\255\255\255\256\256\257\257\257\260\260\260\261\261\261\261\261\261\261\261\263\263\263\264\264\264\265\265\264\264\264\264\264\264\264"..., > src1=0xaadf6990 > "bcegijjkkklononnnmmmmmnnnoppqqqrvvuuuvwxy{|}}}}~~\177\200\201\201\202\203\202\202\203\204\204\204\204\205\205\206\206\206\206\205\205\205\204\203\203\203\202\202\202\202\202\203\204\204\205\205\207\211\210\211\213\215\220\222\222\221\221\221\221\220\220\220\220\221\223\223\224\225\226\225\225\225\227\232\233\234\235\235\234\234\235\235\235\236\237\236\237\240\237\236\236\237\237\237\240\241\241\241\241\242\243\243\243\244\245\244\245\246\246\246\247\247\250\251\252\253\253\253\253\252\252\254\254\254\254\254\255\255\256\257\257\257\257\257\257\257\257\260\260\261\262\262\261\260\261\261\262\262\262\263\264\264\264\264\264\264\264\264\264\264\263"..., > s=0xaac58b10) at src/libavcodec/me_cmp.c:631 > #2 dct_sad16_c (s=0xaac58b10, > dst=0xaadf6990 > "bcegijjkkklononnnmmmmmnnnoppqqqrvvuuuvwxy{|}}}}~~\177\200\201\201\202\203\202\202\203\204\204\204\204\205\205\206\206\206\206\205\205\205\204\203\203\203\202\202\202\202\202\203\204\204\205\205\207\211\210\211\213\215\220\222\222\221\221\221\221\220\220\220\220\221\223\223\224\225\226\225\225\225\227\232\233\234\235\235\234\234\235\235\235\236\237\236\237\240\237\236\236\237\237\237\240\241\241\241\241\242\243\243\243\244\245\244\245\246\246\246\247\247\250\251\252\253\253\253\253\252\252\254\254\254\254\254\255\255\256\257\257\257\257\257\257\257\257\260\260\261\262\262\261\260\261\261\262\262\262\263\264\264\264\264\264\264\264\264\264\264\263"..., > src=0xaacf377f > "ddefhiiihllllmmmnllllllllnnoopqqruuuvvvwwyyz{{|}}\200\200\201\201\202\203\203\203\202\202\202\203\203\203\204\204\206\205\205\204\204\203\203\203\200\201\201\201\201\202\202\202\206\206\206\206\206\206\206\206\210\212\215\220\222\222\221\220\220\220\220\221\221\222\222\222\223\223\224\225\225\226\226\227\235\235\236\236\236", > '\237' <repeats 13 times>, > "\240\240\241\241\242\242\243\243\243\244\245\245\246\246\247\250\250\251\251\252\252\253\251\251\252\252\252\253\253\253\255\255\255\255\255\255\255\255\256\256\257\257\257\260\260\260\261\261\261\261\261\261\261\261\263\263\263\264\264\264\265\265\264\264\264\264\264\264\264"..., > stride=352, h=16) at src/libavcodec/me_cmp.c:971 > #3 0xf6570cec in cmp_inline (chroma=0, qpel=0, chroma_cmp_func=<optimized > out>, cmp_func=0x0, src_index=<optimized out>, ref_index=<optimized out>, > h=16, size=0, suby=0, subx=0, y=<optimized out>, x=-1, s=0x0) at > src/libavcodec/motion_est.c:217 > #4 cmp_simple (chroma_cmp_func=<optimized out>, cmp_func=0x0, > src_index=<optimized out>, ref_index=<optimized out>, y=<optimized out>, > x=-1, s=0x0) > at src/libavcodec/motion_est.c:234 > #5 cmp (flags=0, chroma_cmp_func=<optimized out>, cmp_func=0x0, > src_index=<optimized out>, ref_index=<optimized out>, h=16, size=0, suby=0, > subx=0, > y=<optimized out>, x=-1, s=0x0) at src/libavcodec/motion_est.c:266 > #6 small_diamond_search (flags=0, h=16, size=0, penalty_factor=-16, > ref_index=240, src_index=2, dmin=<optimized out>, best=0xfffee064, s=0x0) > at src/libavcodec/motion_est_template.c:445 > #7 diamond_search (flags=0, h=16, size=0, penalty_factor=-16, ref_index=240, > src_index=2, dmin=<optimized out>, best=0xfffee064, s=0x0) > at src/libavcodec/motion_est_template.c:840 > #8 epzs_motion_search_internal (h=16, size=0, flags=0, ref_mv_scale=0, > last_mv=0x0, ref_index=-162058212, src_index=0, P=0xfffee01c, > my_ptr=0xf77efce8 <__stack_chk_guard>, mx_ptr=0x15, s=0x1196a700) at > src/libavcodec/motion_est_template.c:966 > #9 ff_epzs_motion_search (s=0x1196a700, s@entry=0xaac58b10, mx_ptr=0x15, > mx_ptr@entry=0xfffee0e4, my_ptr=0xf77efce8 <__stack_chk_guard>, > my_ptr@entry=0xfffee0e8, P=P@entry=0xfffee0ec, > src_index=src_index@entry=0, ref_index=ref_index@entry=0, last_mv=0xaaccf9b8, > ref_mv_scale=32768, > ref_mv_scale@entry=65536, size=size@entry=0, h=h@entry=16) at > src/libavcodec/motion_est_template.c:984 > #10 0xf657301c in ff_estimate_p_frame_motion (s=s@entry=0xaac58b10, mb_x=49, > mb_y=-1428350416) at src/libavcodec/motion_est.c:978 > #11 0xf65c1cd4 in estimate_motion_thread (c=<optimized out>, arg=<optimized > out>) at src/libavcodec/mpegvideo_enc.c:2876 > #12 0xf671d23c in avcodec_default_execute (c=0xaac5c580, func=0xf65c1c18 > <estimate_motion_thread>, arg=<optimized out>, ret=<optimized out>, > count=1, size=4) at src/libavcodec/utils.c:1015 > #13 0xf65c9304 in encode_picture (picture_number=0, s=0xaac58b10) at > src/libavcodec/mpegvideo_enc.c:3824 > #14 ff_mpv_encode_picture (avctx=avctx@entry=0xaac5c580, > pkt=pkt@entry=0xaac698e0, pic_arg=pic_arg@entry=0xaacf1fd0, > got_packet=got_packet@entry=0xfffee308) at > src/libavcodec/mpegvideo_enc.c:1962 > #15 0xf671e110 in avcodec_encode_video2 (avctx=avctx@entry=0xaac5c580, > avpkt=0xaac698e0, frame=frame@entry=0xaacf1fd0, > got_packet_ptr=got_packet_ptr@entry=0xfffee308) at > src/libavcodec/utils.c:2008 > #16 0xf671e488 in do_encode (avctx=0xaac5c580, frame=0xaacf1fd0, > got_packet=0xfffee308) at src/libavcodec/utils.c:2979 > #17 0xf6725330 in avcodec_send_frame (avctx=0xaac5c580, frame=0xaacf1fd0) at > src/libavcodec/utils.c:3028 > #18 0xaaacc824 in do_video_out (of=0xf4240, ost=0xaac5c3c0, > next_picture=0xaac5bf10, sync_ipts=1) at src/ffmpeg.c:1289 > #19 0xaaad15bc in reap_filters (flush=-1431350620) at src/ffmpeg.c:1507 > #20 0xaaad5df4 in transcode_step () at src/ffmpeg.c:4538 > #21 transcode () at src/ffmpeg.c:4582 > #22 0xaaab1cf4 in main (argc=<optimized out>, argv=<optimized out>) at > src/ffmpeg.c:4787 Note the backtrace is taken just before the SIGBUS because ff_diff_pixels_armv6 reuses lr which makes obtaining a backtrace difficult otherwise. > (gdb) c > Continuing. > > Thread 1 "ffmpeg" received signal SIGBUS, Bus error. > ff_diff_pixels_armv6 () at src/libavcodec/arm/pixblockdsp_armv6.S:52 > 52 ldrd_post r6, r7, r2, r3 It appears that the 3rd argument (r2 / src2) is misaligned which causes the SIGBUS: > (gdb) info reg > r0 0xfffedf20 4294893344 > r1 0xaadf6af0 2866768624 > r2 0xaacf377f 2865706879 > r3 0x160 352 At this point I stopped looking into the bug for now. James
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