Summary of the bug:
UBSan: libavcodec/vp9.c:2838:49: runtime error: left shift of negative value -12
How to reproduce:
% ffmpeg -f ivf -i <test_case> -f null -
ffmpeg version N-77718-g72673ad Copyright (c) 2000-2016 the FFmpeg developers
built with Ubuntu clang version 3.7.1-svn253742-1~exp1 (branches/release_37) (based on LLVM 3.7.1)
configuration: --cc=clang --cxx=clang++ --disable-libxcb --disable-xlib --disable-logging --disable-ffprobe --disable-ffplay --disable-sdl --disable-ffserver --disable-doc --disable-pthreads --disable-network --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --disable-stripping --disable-runtime-cpudetect --disable-securetransport --disable-iconv
libavutil 55. 12.100 / 55. 12.100
libavcodec 57. 22.100 / 57. 22.100
libavformat 57. 21.101 / 57. 21.101
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 23.100 / 6. 23.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
[NULL @ 0x619000005a80] [IMGUTILS @ 0x7f82ba2f61a0] Picture size 0x0 is invalid
[NULL @ 0x619000005a80] Ignoring invalid width/height values
[NULL @ 0x619000005a80] [IMGUTILS @ 0x7f82ba2f65a0] Picture size 0x0 is invalid
[vp9 @ 0x619000005a80] Warning: not compiled with thread support, using thread emulation
Truncating packet of size 536879170 to 124
Input #0, ivf, from '/home/user/Desktop/ffmpeg/ivf_corpus/00ab3dc20d1e87034e06d4de4f4ba944dea4b906':
Duration: 00:00:00.19, start: 1179551295.937500, bitrate: 8 kb/s
Stream #0:0: Video: vp9 (Profile 1) (VP90 / 0x30395056), yuv444p(tv), 1x1916, 16 tbr, 16 tbn, 16 tbc
[wrapped_avframe @ 0x619000002380] Warning: not compiled with thread support, using thread emulation
[vp9 @ 0x619000002d80] Warning: not compiled with thread support, using thread emulation
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf57.21.101
Stream #0:0: Video: wrapped_avframe, yuv444p, 1x1916, q=2-31, 200 kb/s, 16 fps, 16 tbn, 16 tbc
Metadata:
encoder : Lavc57.22.100 wrapped_avframe
Stream mapping:
Stream #0:0 -> #0:0 (vp9 (native) -> wrapped_avframe (native))
Press [q] to stop, [?] for help
libavcodec/vp9.c:2838:49: runtime error: left shift of negative value -12
#0 0x1dc1f12 in mc_luma_scaled /home/user/code/ffmpeg/libavcodec/vp9.c:2838:49
#1 0x1dc1f12 in inter_pred_scaled_8bpp /home/user/code/ffmpeg/libavcodec/vp9_mc_template.c:212
#2 0x1ca196f in inter_recon /home/user/code/ffmpeg/libavcodec/vp9.c:2980:13
#3 0x1ca196f in inter_recon_8bpp /home/user/code/ffmpeg/libavcodec/vp9.c:3040
#4 0x1ca196f in decode_b /home/user/code/ffmpeg/libavcodec/vp9.c:3294
#5 0x1c8fbbd in decode_sb /home/user/code/ffmpeg/libavcodec/vp9.c:3386:9
#6 0x1c903d1 in decode_sb /home/user/code/ffmpeg/libavcodec/vp9.c:3434:13
#7 0x1c903d1 in decode_sb /home/user/code/ffmpeg/libavcodec/vp9.c:3434:13
#8 0x1c903d1 in decode_sb /home/user/code/ffmpeg/libavcodec/vp9.c:3434:13
#9 0x1c75f55 in vp9_decode_frame /home/user/code/ffmpeg/libavcodec/vp9.c:4164:29
#10 0x1a3fc96 in avcodec_decode_video2 /home/user/code/ffmpeg/libavcodec/utils.c:2107:19
#11 0x589546 in decode_video /home/user/code/ffmpeg/ffmpeg.c:2069:11
#12 0x589546 in process_input_packet /home/user/code/ffmpeg/ffmpeg.c:2318
#13 0x5990bc in process_input /home/user/code/ffmpeg/ffmpeg.c:3980:5
#14 0x5726c6 in transcode_step /home/user/code/ffmpeg/ffmpeg.c:4068:11
#15 0x5726c6 in transcode /home/user/code/ffmpeg/ffmpeg.c:4122
#16 0x56f73c in main /home/user/code/ffmpeg/ffmpeg.c:4314:9
#17 0x7f82bd066ec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
#18 0x466445 in _start (/home/user/Desktop/ffmpeg/ffmpeg_full+0x466445)
Fixed in b86339a9f8d7cf86995e89c7d6683ce3f64a7525.