[FFmpeg-trac] #4856(swscale:open): Crash in swscale when resizing to rgb24

FFmpeg trac at avcodec.org
Wed Sep 16 10:25:21 CEST 2015


#4856: Crash in swscale when resizing to rgb24
-------------------------------------+-------------------------------------
             Reporter:  rxt          |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:  crash        |               Blocked By:
  SIGSEGV regression                 |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * priority:  normal => important
 * status:  new => open
 * component:  undetermined => swscale
 * reproduced:  0 => 1


Old description:

> Summary of the bug:
> Segmentation fault within swscale when resizing to rgb24.
> Happens only for some values of destination height (eg. 1079 to 1088 ok,
> 1089 to 1102 not ok), so seems related to buffer alignment (align to 16).
> Component undetermined, probably swscale but could also be ffmpeg.
>

> How to reproduce:
> {{{
> % ffmpeg -f rawvideo -s 1920x1080 -i /dev/zero -dsth 1096 -pix_fmt rgb24
> -f null /dev/null
> ffmpeg version N-74636-g164cd9b Copyright (c) 2000-2015 the FFmpeg
> developers
>   built with gcc 4.9.2 (Debian 4.9.2-10)
>   configuration: --enable-gpl --enable-postproc --enable-libopencore-
> amrnb --enable-libopencore-amrwb --enable-nonfree --enable-version3
> --enable-libmp3lame --samples=fate-suite/
>   libavutil      55.  2.100 / 55.  2.100
>   libavcodec     57.  2.100 / 57.  2.100
>   libavformat    57.  2.100 / 57.  2.100
>   libavdevice    57.  0.100 / 57.  0.100
>   libavfilter     6.  4.100 /  6.  4.100
>   libswscale      4.  0.100 /  4.  0.100
>   libswresample   2.  0.100 /  2.  0.100
>   libpostproc    54.  0.100 / 54.  0.100
> Input #0, rawvideo, from '/dev/zero':
>   Duration: N/A, start: 0.000000, bitrate: 622080 kb/s
>     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080,
> 622080 kb/s, 25 tbr, 25 tbn, 25 tbc
> Output #0, null, to '/dev/null':
>   Metadata:
>     encoder         : Lavf57.2.100
>     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24,
> 1920x1080, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc57.2.100 rawvideo
> Stream mapping:
>   Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
> Press [q] to stop, [?] for help
> Errore di segmentazione
> }}}
>
> gdb
> {{{
> Starting program: /usr/local/src/ffmpeg/ffmpeg_g -f rawvideo -s 1920x1080
> -i /dev/zero -dsth 1096 -pix_fmt rgb24 -f null /dev/null
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-
> gnu/libthread_db.so.1".
> ffmpeg version N-74636-g164cd9b Copyright (c) 2000-2015 the FFmpeg
> developers
>   built with gcc 4.9.2 (Debian 4.9.2-10)
>   configuration: --enable-gpl --enable-postproc --enable-libopencore-
> amrnb --enable-libopencore-amrwb --enable-nonfree --enable-version3
> --enable-libmp3lame --samples=fate-suite/
>   libavutil      55.  2.100 / 55.  2.100
>   libavcodec     57.  2.100 / 57.  2.100
>   libavformat    57.  2.100 / 57.  2.100
>   libavdevice    57.  0.100 / 57.  0.100
>   libavfilter     6.  4.100 /  6.  4.100
>   libswscale      4.  0.100 /  4.  0.100
>   libswresample   2.  0.100 /  2.  0.100
>   libpostproc    54.  0.100 / 54.  0.100
> Input #0, rawvideo, from '/dev/zero':
>   Duration: N/A, start: 0.000000, bitrate: 622080 kb/s
>     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080,
> 622080 kb/s, 25 tbr, 25 tbn, 25 tbc
> [New Thread 0x7ffff4668700 (LWP 24144)]
> [New Thread 0x7ffff3e67700 (LWP 24145)]
> [New Thread 0x7ffff3666700 (LWP 24146)]
> [New Thread 0x7ffff2e65700 (LWP 24147)]
> [New Thread 0x7ffff2664700 (LWP 24148)]
> [New Thread 0x7ffff1e63700 (LWP 24149)]
> [New Thread 0x7ffff1662700 (LWP 24150)]
> [New Thread 0x7ffff0e61700 (LWP 24151)]
> [New Thread 0x7ffff0660700 (LWP 24152)]
> Output #0, null, to '/dev/null':
>   Metadata:
>     encoder         : Lavf57.2.100
>     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24,
> 1920x1080, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc57.2.100 rawvideo
> Stream mapping:
>   Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
> Press [q] to stop, [?] for help
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000000de6ae7 in yuv2rgb_write (hasAlpha=0, target=AV_PIX_FMT_RGB24,
>     y=1088, _b=0x1baad89, _g=0x1baaeec, _r=0x1baadb7, A2=0, A1=0,
>     Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
>     _dest=0x7fffefe5f040 "") at libswscale/output.c:1246
> 1246            dest[i * 6 + 0] = r_b[Y1];
> }}}
>
> Backtrace
> {{{
> #0  0x0000000000de6ae7 in yuv2rgb_write (hasAlpha=0,
> target=AV_PIX_FMT_RGB24,
>     y=1088, _b=0x1baad89, _g=0x1baaeec, _r=0x1baadb7, A2=0, A1=0,
>     Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
>     _dest=0x7fffefe5f040 "") at libswscale/output.c:1246
> #1  yuv2rgb_X_c_template (hasAlpha=0, target=AV_PIX_FMT_RGB24, y=1088,
>     dstW=1920, dest=0x7fffefe5f040 "", alpSrc=0x0, chrFilterSize=4,
>     chrVSrc=0x1b64190, chrUSrc=0x1b6edd0, chrFilter=0x1b6ad60,
>     lumFilterSize=4, lumSrc=0x1b6ecb8, lumFilter=0x1b640e0, c=<optimized
> out>)
>     at libswscale/output.c:1370
> #2  yuv2rgb24_X_c (c=0x1ba4260, lumFilter=0x1b640e0, lumSrc=0x1b6ecb8,
>     lumFilterSize=4, chrFilter=0x1b6ad60, chrUSrc=0x1b6edd0,
>     chrVSrc=0x1b64190, chrFilterSize=4, alpSrc=0x0, dest=0x7fffefe5f040
> "",
>     dstW=1920, y=1088) at libswscale/output.c:1515
> #3  0x0000000000dcb61e in packed_vscale (c=<optimized out>,
>     desc=<optimized out>, sliceY=1088, sliceH=<optimized out>)
>     at libswscale/vscale.c:129
> #4  0x0000000000dc6dc1 in swscale (c=0x1b4b1c0, src=0x1baaeec,
> srcStride=0x0,
>     srcSliceY=28618424, srcSliceH=28618384, dst=0x1b6edd0,
>     dstStride=0x7fffffffd6d0) at libswscale/swscale.c:682
> #5  0x0000000000dc814a in sws_scale (c=0x1b4b1c0,
> srcSlice=0x7fffffffd6e0,
>     srcStride=0x1b6ecb8, srcSliceY=4, srcSliceH=28749152,
> dst=0x7fffffffd700,
>     dstStride=0x7fffffffd7b0) at libswscale/swscale.c:1263
> #6  0x000000000050a5c8 in scale_slice (y=<optimized out>,
>     link=<optimized out>, field=<optimized out>, mul=<optimized out>,
>     h=<optimized out>, sws=<optimized out>, cur_pic=<optimized out>,
>     out_buf=<optimized out>) at libavfilter/vf_scale.c:477
> #7  filter_frame (link=0x1b4a740, in=0x1b61c00) at
> libavfilter/vf_scale.c:579
> #8  0x000000000049f71f in ff_filter_frame_framed (link=0x1b4a740,
>     frame=0x1b61c00) at libavfilter/avfilter.c:1089
> #9  0x00000000004a17d9 in ff_filter_frame (link=0x1b4a740,
> frame=0x1b61c00)
>     at libavfilter/avfilter.c:1173
> #10 0x000000000049f71f in ff_filter_frame_framed (link=0x1b4a1c0,
>     frame=0x1b61c00) at libavfilter/avfilter.c:1089
> #11 0x00000000004a17d9 in ff_filter_frame (link=0x1b4a1c0,
> frame=0x1b61c00)
>     at libavfilter/avfilter.c:1173
> #12 0x00000000004a58e2 in request_frame (link=0x1b4a1c0)
>     at libavfilter/buffersrc.c:378
> #13 0x00000000004a5614 in av_buffersrc_add_frame_internal (
>     ctx=ctx at entry=0x1b48680, frame=frame at entry=0x1b616e0,
> flags=flags at entry=4)
>     at libavfilter/buffersrc.c:180
> #14 0x00000000004a5b0d in av_buffersrc_add_frame_flags (ctx=0x1b48680,
>     frame=frame at entry=0x1b616e0, flags=flags at entry=4)
>     at libavfilter/buffersrc.c:105
> #15 0x0000000000487572 in decode_video (ist=0x1b46bc0, pkt=<optimized
> out>,
>     got_output=<optimized out>) at ffmpeg.c:2179
> #16 0x00000000004718d3 in process_input_packet (pkt=<optimized out>,
>     ist=<optimized out>) at ffmpeg.c:2327
> #17 process_input (file_index=<optimized out>) at ffmpeg.c:3833
> #18 transcode_step () at ffmpeg.c:3921
> #19 transcode () at ffmpeg.c:3974
> #20 main (argc=28601280, argv=0x7fffffffdff0) at ffmpeg.c:4157
> }}}
>
> Disassembly
> {{{
> Dump of assembler code from 0xde6ac7 to 0xde6b07:
>    0x0000000000de6ac7 <yuv2rgb24_X_c+311>:      movslq (%r10,%r11,4),%r10
>    0x0000000000de6acb <yuv2rgb24_X_c+315>:      mov    -0x20(%rsp),%r15
>    0x0000000000de6ad0 <yuv2rgb24_X_c+320>:      add    0x2e00(%rdi),%r10
>    0x0000000000de6ad7 <yuv2rgb24_X_c+327>:      mov    0x4600(%rdi),%rdi
>    0x0000000000de6ade <yuv2rgb24_X_c+334>:      movzbl
> (%rax,%r14,1),%r11d
>    0x0000000000de6ae3 <yuv2rgb24_X_c+339>:      add    $0x6,%r15
> => 0x0000000000de6ae7 <yuv2rgb24_X_c+343>:      mov    %r11b,-0x6(%r15)
>    0x0000000000de6aeb <yuv2rgb24_X_c+347>:      movzbl
> (%r10,%r14,1),%r11d
>    0x0000000000de6af0 <yuv2rgb24_X_c+352>:      mov    %r11b,-0x5(%r15)
>    0x0000000000de6af4 <yuv2rgb24_X_c+356>:      movzbl
> (%rdi,%r14,1),%r11d
>    0x0000000000de6af9 <yuv2rgb24_X_c+361>:      mov    %r11b,-0x4(%r15)
>    0x0000000000de6afd <yuv2rgb24_X_c+365>:      movzbl (%rax,%rbx,1),%eax
>    0x0000000000de6b01 <yuv2rgb24_X_c+369>:      mov    %al,-0x3(%r15)
>    0x0000000000de6b05 <yuv2rgb24_X_c+373>:      movzbl (%r10,%rbx,1),%eax
> }}}
>
> Registers
> {{{
> rax            0x1baadb7        29011383
> rbx            0x0      0
> rcx            0x4      4
> rdx            0x1b6ecb8        28765368
> rsi            0x1b640e0        28721376
> rdi            0x1baad89        29011337
> rbp            0x542    0x542
> rsp            0x7fffffffd3e8   0x7fffffffd3e8
> r8             0x1b6ad60        28749152
> r9             0x1b6edd0        28765648
> r10            0x1baaeec        29011692
> r11            0x0      0
> r12            0xa84    2692
> r13            0x1b64190        28721552
> r14            0x0      0
> r15            0x7fffefe60006   140737218215942
> rip            0xde6ae7 0xde6ae7 <yuv2rgb24_X_c+343>
> eflags         0x10206  [ PF IF RF ]
> cs             0x33     51
> ss             0x2b     43
> ds             0x0      0
> es             0x0      0
> fs             0x0      0
> gs             0x0      0
> st0            0        (raw 0x00000000000000000000)
> st1            0        (raw 0x00000000000000000000)
> st2            0        (raw 0x00000000000000000000)
> st3            0        (raw 0x00000000000000000000)
> st4            0        (raw 0x00000000000000000000)
> st5            0        (raw 0x00000000000000000000)
> st6            0        (raw 0x00000000000000000000)
> st7            0        (raw 0x00000000000000000000)
> fctrl          0x37f    895
> fstat          0x0      0
> ftag           0xffff   65535
> fiseg          0x0      0
> fioff          0x0      0
> foseg          0x0      0
> fooff          0x0      0
> fop            0x0      0
> mxcsr          0x1fa8   [ OE PE IM DM ZM OM UM PM ]
> ymm0           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm1           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm2           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0},
> v32_int8 = {
>     0x6d <repeats 16 times>, 0x0 <repeats 16 times>}, v16_int16 =
> {0x6d6d,
>     0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x6d6d6d6d, 0x6d6d6d6d,
> 0x6d6d6d6d,
>     0x6d6d6d6d, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {0x6d6d6d6d6d6d6d6d,
>     0x6d6d6d6d6d6d6d6d, 0x0, 0x0}, v2_int128 = {
>     0x6d6d6d6d6d6d6d6d6d6d6d6d6d6d6d6d,
> 0x00000000000000000000000000000000}}
> ymm3           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm4           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm5           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm6           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0},
> v32_int8 = {
>     0x0, 0x0, 0x0, 0x0, 0xff <repeats 12 times>, 0x0 <repeats 16 times>},
>   v16_int16 = {0x0, 0x0, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
> 0x0,
>     0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x0, 0xffffffff,
>     0xffffffff, 0xffffffff, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {
>     0xffffffff00000000, 0xffffffffffffffff, 0x0, 0x0}, v2_int128 = {
>     0xffffffffffffffffffffffff00000000,
> 0x00000000000000000000000000000000}}
> ymm7           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm8           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm9           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm10          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0},
> v32_int8 = {
>     0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff, 0x0, 0x0, 0x0, 0xff,
> 0xff,
>     0xff, 0xff, 0xff, 0x0 <repeats 16 times>}, v16_int16 = {0x0, 0x0,
> 0xffff,
>     0xffff, 0x0, 0xff00, 0xffff, 0xffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0}, v8_int32 = {0x0, 0xffffffff, 0xff000000, 0xffffffff, 0x0, 0x0,
> 0x0,
>     0x0}, v4_int64 = {0xffffffff00000000, 0xffffffffff000000, 0x0, 0x0},
>   v2_int128 = {0xffffffffff000000ffffffff00000000,
>     0x00000000000000000000000000000000}}
> ymm11          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0},
> v32_int8 = {
>     0x0, 0x0, 0x0, 0x0, 0xff <repeats 12 times>, 0x0 <repeats 16 times>},
>   v16_int16 = {0x0, 0x0, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
> 0x0,
>     0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x0, 0xffffffff,
>     0xffffffff, 0xffffffff, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {
>     0xffffffff00000000, 0xffffffffffffffff, 0x0, 0x0}, v2_int128 = {
>     0xffffffffffffffffffffffff00000000,
> 0x00000000000000000000000000000000}}
> ymm12          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
> ---Type <return> to continue, or q <return> to quit---
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
>   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
> 0x0,
>     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
>     0x00000000000000000000000000000000,
> 0x00000000000000000000000000000000}}
> ymm13          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0, 0x0, 0x0, 0x0, 0x0,
> 0x80,
>     0x59, 0xbc, 0x0 <repeats 24 times>}, v16_int16 = {0x0, 0x0, 0x8000,
>     0xbc59, 0x0 <repeats 12 times>}, v8_int32 = {0x0, 0xbc598000, 0x0,
> 0x0,
>     0x0, 0x0, 0x0, 0x0}, v4_int64 = {0xbc59800000000000, 0x0, 0x0, 0x0},
>   v2_int128 = {0x0000000000000000bc59800000000000,
>     0x00000000000000000000000000000000}}
> ymm14          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x8e, 0x85, 0x83, 0xe8,
> 0xf0,
>     0x24, 0x53, 0x3c, 0x0 <repeats 24 times>}, v16_int16 = {0x858e,
> 0xe883,
>     0x24f0, 0x3c53, 0x0 <repeats 12 times>}, v8_int32 = {0xe883858e,
>     0x3c5324f0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int64 =
> {0x3c5324f0e883858e,
>     0x0, 0x0, 0x0}, v2_int128 = {0x00000000000000003c5324f0e883858e,
>     0x00000000000000000000000000000000}}
> ymm15          {v8_float = {0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
>   v4_double = {0x2d, 0x0, 0x0, 0x0}, v32_int8 = {0xc0, 0x9, 0xf2, 0x16,
> 0xb5,
>     0xdf, 0x46, 0x40, 0x0 <repeats 24 times>}, v16_int16 = {0x9c0,
> 0x16f2,
>     0xdfb5, 0x4046, 0x0 <repeats 12 times>}, v8_int32 = {0x16f209c0,
>     0x4046dfb5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int64 =
> {0x4046dfb516f209c0,
>     0x0, 0x0, 0x0}, v2_int128 = {0x00000000000000004046dfb516f209c0,
>     0x00000000000000000000000000000000}}
> }}}
>
> git bisect points to this commit
>
> 6dbaeed6b7b7c858dffdf141b725506b887660e7 is the first bad commit
> commit 6dbaeed6b7b7c858dffdf141b725506b887660e7
> Author: Michael Niedermayer <michael at niedermayer.cc>
> Date:   Sat Aug 8 13:33:46 2015 +0200
>
>     ffmpeg: switch swscale option handling to AVDictionary similar to
> what the other subsystems use
>
>     Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
>
> :100644 100644 434abd4d053734028a5049b64082a5e1b0cbaea5
> 9dcd641d8f1a9d20586a942350865c10691ce19c M      ffmpeg.c
> :100644 100644 03ba2d0d99027eb33d33a6857b4daadc6ae8f90b
> 6544e6fb05ad9c99631a0342e7ae0561856cfe19 M      ffmpeg.h
> :100644 100644 ce2ffc0b7acb0e6d6d15894a1572384fe9e535b7
> 8a96c4be86734fd12c85dbd3d2c6f3fe773c2d1b M      ffmpeg_filter.c
> :100644 100644 66a43b4093f56f0362701368c69ff42dd072b81e
> 28d305103a1dbac2d734be5a4ec320cca82f2ffd M      ffmpeg_opt.c
>
> even if I can't see a relation to the problem.

New description:

 Summary of the bug:
 Segmentation fault within swscale when resizing to rgb24.
 Happens only for some values of destination height (eg. 1079 to 1088 ok,
 1089 to 1102 not ok), so seems related to buffer alignment (align to 16).
 Component undetermined, probably swscale but could also be ffmpeg.


 How to reproduce:
 {{{
 % ffmpeg -f rawvideo -s 1920x1080 -i /dev/zero -dsth 1096 -pix_fmt rgb24
 -f null /dev/null
 ffmpeg version N-74636-g164cd9b Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --enable-gpl --enable-postproc --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-nonfree --enable-version3 --enable-
 libmp3lame --samples=fate-suite/
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  2.100 / 57.  2.100
   libavformat    57.  2.100 / 57.  2.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6.  4.100 /  6.  4.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, rawvideo, from '/dev/zero':
   Duration: N/A, start: 0.000000, bitrate: 622080 kb/s
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080,
 622080 kb/s, 25 tbr, 25 tbn, 25 tbc
 Output #0, null, to '/dev/null':
   Metadata:
     encoder         : Lavf57.2.100
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1920x1080,
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc57.2.100 rawvideo
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
 Press [q] to stop, [?] for help
 Errore di segmentazione
 }}}

 gdb
 {{{
 Starting program: /usr/local/src/ffmpeg/ffmpeg_g -f rawvideo -s 1920x1080
 -i /dev/zero -dsth 1096 -pix_fmt rgb24 -f null /dev/null
 [Thread debugging using libthread_db enabled]
 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
 ffmpeg version N-74636-g164cd9b Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --enable-gpl --enable-postproc --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-nonfree --enable-version3 --enable-
 libmp3lame --samples=fate-suite/
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  2.100 / 57.  2.100
   libavformat    57.  2.100 / 57.  2.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6.  4.100 /  6.  4.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
   libpostproc    54.  0.100 / 54.  0.100
 Input #0, rawvideo, from '/dev/zero':
   Duration: N/A, start: 0.000000, bitrate: 622080 kb/s
     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080,
 622080 kb/s, 25 tbr, 25 tbn, 25 tbc
 [New Thread 0x7ffff4668700 (LWP 24144)]
 [New Thread 0x7ffff3e67700 (LWP 24145)]
 [New Thread 0x7ffff3666700 (LWP 24146)]
 [New Thread 0x7ffff2e65700 (LWP 24147)]
 [New Thread 0x7ffff2664700 (LWP 24148)]
 [New Thread 0x7ffff1e63700 (LWP 24149)]
 [New Thread 0x7ffff1662700 (LWP 24150)]
 [New Thread 0x7ffff0e61700 (LWP 24151)]
 [New Thread 0x7ffff0660700 (LWP 24152)]
 Output #0, null, to '/dev/null':
   Metadata:
     encoder         : Lavf57.2.100
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1920x1080,
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc57.2.100 rawvideo
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
 Press [q] to stop, [?] for help

 Program received signal SIGSEGV, Segmentation fault.
 0x0000000000de6ae7 in yuv2rgb_write (hasAlpha=0, target=AV_PIX_FMT_RGB24,
     y=1088, _b=0x1baad89, _g=0x1baaeec, _r=0x1baadb7, A2=0, A1=0,
     Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
     _dest=0x7fffefe5f040 "") at libswscale/output.c:1246
 1246            dest[i * 6 + 0] = r_b[Y1];
 }}}

 Backtrace
 {{{
 #0  0x0000000000de6ae7 in yuv2rgb_write (hasAlpha=0,
 target=AV_PIX_FMT_RGB24,
     y=1088, _b=0x1baad89, _g=0x1baaeec, _r=0x1baadb7, A2=0, A1=0,
     Y2=<optimized out>, Y1=<optimized out>, i=<optimized out>,
     _dest=0x7fffefe5f040 "") at libswscale/output.c:1246
 #1  yuv2rgb_X_c_template (hasAlpha=0, target=AV_PIX_FMT_RGB24, y=1088,
     dstW=1920, dest=0x7fffefe5f040 "", alpSrc=0x0, chrFilterSize=4,
     chrVSrc=0x1b64190, chrUSrc=0x1b6edd0, chrFilter=0x1b6ad60,
     lumFilterSize=4, lumSrc=0x1b6ecb8, lumFilter=0x1b640e0, c=<optimized
 out>)
     at libswscale/output.c:1370
 #2  yuv2rgb24_X_c (c=0x1ba4260, lumFilter=0x1b640e0, lumSrc=0x1b6ecb8,
     lumFilterSize=4, chrFilter=0x1b6ad60, chrUSrc=0x1b6edd0,
     chrVSrc=0x1b64190, chrFilterSize=4, alpSrc=0x0, dest=0x7fffefe5f040
 "",
     dstW=1920, y=1088) at libswscale/output.c:1515
 #3  0x0000000000dcb61e in packed_vscale (c=<optimized out>,
     desc=<optimized out>, sliceY=1088, sliceH=<optimized out>)
     at libswscale/vscale.c:129
 #4  0x0000000000dc6dc1 in swscale (c=0x1b4b1c0, src=0x1baaeec,
 srcStride=0x0,
     srcSliceY=28618424, srcSliceH=28618384, dst=0x1b6edd0,
     dstStride=0x7fffffffd6d0) at libswscale/swscale.c:682
 #5  0x0000000000dc814a in sws_scale (c=0x1b4b1c0, srcSlice=0x7fffffffd6e0,
     srcStride=0x1b6ecb8, srcSliceY=4, srcSliceH=28749152,
 dst=0x7fffffffd700,
     dstStride=0x7fffffffd7b0) at libswscale/swscale.c:1263
 #6  0x000000000050a5c8 in scale_slice (y=<optimized out>,
     link=<optimized out>, field=<optimized out>, mul=<optimized out>,
     h=<optimized out>, sws=<optimized out>, cur_pic=<optimized out>,
     out_buf=<optimized out>) at libavfilter/vf_scale.c:477
 #7  filter_frame (link=0x1b4a740, in=0x1b61c00) at
 libavfilter/vf_scale.c:579
 #8  0x000000000049f71f in ff_filter_frame_framed (link=0x1b4a740,
     frame=0x1b61c00) at libavfilter/avfilter.c:1089
 #9  0x00000000004a17d9 in ff_filter_frame (link=0x1b4a740,
 frame=0x1b61c00)
     at libavfilter/avfilter.c:1173
 #10 0x000000000049f71f in ff_filter_frame_framed (link=0x1b4a1c0,
     frame=0x1b61c00) at libavfilter/avfilter.c:1089
 #11 0x00000000004a17d9 in ff_filter_frame (link=0x1b4a1c0,
 frame=0x1b61c00)
     at libavfilter/avfilter.c:1173
 #12 0x00000000004a58e2 in request_frame (link=0x1b4a1c0)
     at libavfilter/buffersrc.c:378
 #13 0x00000000004a5614 in av_buffersrc_add_frame_internal (
     ctx=ctx at entry=0x1b48680, frame=frame at entry=0x1b616e0,
 flags=flags at entry=4)
     at libavfilter/buffersrc.c:180
 #14 0x00000000004a5b0d in av_buffersrc_add_frame_flags (ctx=0x1b48680,
     frame=frame at entry=0x1b616e0, flags=flags at entry=4)
     at libavfilter/buffersrc.c:105
 #15 0x0000000000487572 in decode_video (ist=0x1b46bc0, pkt=<optimized
 out>,
     got_output=<optimized out>) at ffmpeg.c:2179
 #16 0x00000000004718d3 in process_input_packet (pkt=<optimized out>,
     ist=<optimized out>) at ffmpeg.c:2327
 #17 process_input (file_index=<optimized out>) at ffmpeg.c:3833
 #18 transcode_step () at ffmpeg.c:3921
 #19 transcode () at ffmpeg.c:3974
 #20 main (argc=28601280, argv=0x7fffffffdff0) at ffmpeg.c:4157
 }}}

 Disassembly
 {{{
 Dump of assembler code from 0xde6ac7 to 0xde6b07:
    0x0000000000de6ac7 <yuv2rgb24_X_c+311>:      movslq (%r10,%r11,4),%r10
    0x0000000000de6acb <yuv2rgb24_X_c+315>:      mov    -0x20(%rsp),%r15
    0x0000000000de6ad0 <yuv2rgb24_X_c+320>:      add    0x2e00(%rdi),%r10
    0x0000000000de6ad7 <yuv2rgb24_X_c+327>:      mov    0x4600(%rdi),%rdi
    0x0000000000de6ade <yuv2rgb24_X_c+334>:      movzbl (%rax,%r14,1),%r11d
    0x0000000000de6ae3 <yuv2rgb24_X_c+339>:      add    $0x6,%r15
 => 0x0000000000de6ae7 <yuv2rgb24_X_c+343>:      mov    %r11b,-0x6(%r15)
    0x0000000000de6aeb <yuv2rgb24_X_c+347>:      movzbl (%r10,%r14,1),%r11d
    0x0000000000de6af0 <yuv2rgb24_X_c+352>:      mov    %r11b,-0x5(%r15)
    0x0000000000de6af4 <yuv2rgb24_X_c+356>:      movzbl (%rdi,%r14,1),%r11d
    0x0000000000de6af9 <yuv2rgb24_X_c+361>:      mov    %r11b,-0x4(%r15)
    0x0000000000de6afd <yuv2rgb24_X_c+365>:      movzbl (%rax,%rbx,1),%eax
    0x0000000000de6b01 <yuv2rgb24_X_c+369>:      mov    %al,-0x3(%r15)
    0x0000000000de6b05 <yuv2rgb24_X_c+373>:      movzbl (%r10,%rbx,1),%eax
 }}}

 Registers
 {{{
 rax            0x1baadb7        29011383
 rbx            0x0      0
 rcx            0x4      4
 rdx            0x1b6ecb8        28765368
 rsi            0x1b640e0        28721376
 rdi            0x1baad89        29011337
 rbp            0x542    0x542
 rsp            0x7fffffffd3e8   0x7fffffffd3e8
 r8             0x1b6ad60        28749152
 r9             0x1b6edd0        28765648
 r10            0x1baaeec        29011692
 r11            0x0      0
 r12            0xa84    2692
 r13            0x1b64190        28721552
 r14            0x0      0
 r15            0x7fffefe60006   140737218215942
 rip            0xde6ae7 0xde6ae7 <yuv2rgb24_X_c+343>
 eflags         0x10206  [ PF IF RF ]
 cs             0x33     51
 ss             0x2b     43
 ds             0x0      0
 es             0x0      0
 fs             0x0      0
 gs             0x0      0
 st0            0        (raw 0x00000000000000000000)
 st1            0        (raw 0x00000000000000000000)
 st2            0        (raw 0x00000000000000000000)
 st3            0        (raw 0x00000000000000000000)
 st4            0        (raw 0x00000000000000000000)
 st5            0        (raw 0x00000000000000000000)
 st6            0        (raw 0x00000000000000000000)
 st7            0        (raw 0x00000000000000000000)
 fctrl          0x37f    895
 fstat          0x0      0
 ftag           0xffff   65535
 fiseg          0x0      0
 fioff          0x0      0
 foseg          0x0      0
 fooff          0x0      0
 fop            0x0      0
 mxcsr          0x1fa8   [ OE PE IM DM ZM OM UM PM ]
 ymm0           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm1           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm2           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0}, v32_int8
 = {
     0x6d <repeats 16 times>, 0x0 <repeats 16 times>}, v16_int16 = {0x6d6d,
     0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x6d6d, 0x0, 0x0, 0x0,
     0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x6d6d6d6d, 0x6d6d6d6d,
 0x6d6d6d6d,
     0x6d6d6d6d, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {0x6d6d6d6d6d6d6d6d,
     0x6d6d6d6d6d6d6d6d, 0x0, 0x0}, v2_int128 = {
     0x6d6d6d6d6d6d6d6d6d6d6d6d6d6d6d6d,
 0x00000000000000000000000000000000}}
 ymm3           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm4           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm5           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm6           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0}, v32_int8
 = {
     0x0, 0x0, 0x0, 0x0, 0xff <repeats 12 times>, 0x0 <repeats 16 times>},
   v16_int16 = {0x0, 0x0, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
 0x0,
     0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x0, 0xffffffff,
     0xffffffff, 0xffffffff, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {
     0xffffffff00000000, 0xffffffffffffffff, 0x0, 0x0}, v2_int128 = {
     0xffffffffffffffffffffffff00000000,
 0x00000000000000000000000000000000}}
 ymm7           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm8           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm9           {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm10          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0}, v32_int8
 = {
     0x0, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff, 0x0, 0x0, 0x0, 0xff, 0xff,
     0xff, 0xff, 0xff, 0x0 <repeats 16 times>}, v16_int16 = {0x0, 0x0,
 0xffff,
     0xffff, 0x0, 0xff00, 0xffff, 0xffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0}, v8_int32 = {0x0, 0xffffffff, 0xff000000, 0xffffffff, 0x0, 0x0,
 0x0,
     0x0}, v4_int64 = {0xffffffff00000000, 0xffffffffff000000, 0x0, 0x0},
   v2_int128 = {0xffffffffff000000ffffffff00000000,
     0x00000000000000000000000000000000}}
 ymm11          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x8000000000000000, 0x8000000000000000, 0x0, 0x0}, v32_int8
 = {
     0x0, 0x0, 0x0, 0x0, 0xff <repeats 12 times>, 0x0 <repeats 16 times>},
   v16_int16 = {0x0, 0x0, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
 0x0,
     0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int32 = {0x0, 0xffffffff,
     0xffffffff, 0xffffffff, 0x0, 0x0, 0x0, 0x0}, v4_int64 = {
     0xffffffff00000000, 0xffffffffffffffff, 0x0, 0x0}, v2_int128 = {
     0xffffffffffffffffffffffff00000000,
 0x00000000000000000000000000000000}}
 ymm12          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
 ---Type <return> to continue, or q <return> to quit---
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0 <repeats 32 times>},
   v16_int16 = {0x0 <repeats 16 times>}, v8_int32 = {0x0, 0x0, 0x0, 0x0,
 0x0,
     0x0, 0x0, 0x0}, v4_int64 = {0x0, 0x0, 0x0, 0x0}, v2_int128 = {
     0x00000000000000000000000000000000,
 0x00000000000000000000000000000000}}
 ymm13          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x0, 0x0, 0x0, 0x0, 0x0,
 0x80,
     0x59, 0xbc, 0x0 <repeats 24 times>}, v16_int16 = {0x0, 0x0, 0x8000,
     0xbc59, 0x0 <repeats 12 times>}, v8_int32 = {0x0, 0xbc598000, 0x0,
 0x0,
     0x0, 0x0, 0x0, 0x0}, v4_int64 = {0xbc59800000000000, 0x0, 0x0, 0x0},
   v2_int128 = {0x0000000000000000bc59800000000000,
     0x00000000000000000000000000000000}}
 ymm14          {v8_float = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x0, 0x0, 0x0, 0x0}, v32_int8 = {0x8e, 0x85, 0x83, 0xe8,
 0xf0,
     0x24, 0x53, 0x3c, 0x0 <repeats 24 times>}, v16_int16 = {0x858e,
 0xe883,
     0x24f0, 0x3c53, 0x0 <repeats 12 times>}, v8_int32 = {0xe883858e,
     0x3c5324f0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int64 =
 {0x3c5324f0e883858e,
     0x0, 0x0, 0x0}, v2_int128 = {0x00000000000000003c5324f0e883858e,
     0x00000000000000000000000000000000}}
 ymm15          {v8_float = {0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
   v4_double = {0x2d, 0x0, 0x0, 0x0}, v32_int8 = {0xc0, 0x9, 0xf2, 0x16,
 0xb5,
     0xdf, 0x46, 0x40, 0x0 <repeats 24 times>}, v16_int16 = {0x9c0, 0x16f2,
     0xdfb5, 0x4046, 0x0 <repeats 12 times>}, v8_int32 = {0x16f209c0,
     0x4046dfb5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int64 =
 {0x4046dfb516f209c0,
     0x0, 0x0, 0x0}, v2_int128 = {0x00000000000000004046dfb516f209c0,
     0x00000000000000000000000000000000}}
 }}}

--

Comment:

 Regression since 6dbaeed6b7b7c858dffdf141b725506b887660e7

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4856#comment:1>
FFmpeg <https://ffmpeg.org>
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