[FFmpeg-trac] #407(avcodec:new): Crash in ff_put_pixels16_neon (EXC_BAD_ACCESS)
FFmpeg
trac at avcodec.org
Mon Aug 22 17:03:43 CEST 2011
#407: Crash in ff_put_pixels16_neon (EXC_BAD_ACCESS)
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Reporter: redeemarr | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: unspecified | Resolution:
Keywords: Crash, Error resilience | Blocked By:
Blocking: | Reproduced: 0
Analyzed: 0 |
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Comment (by redeemarr):
Added sample frame, what been last before crash. I'll try to capture all
the frames since last I-frame, if you need that.
Also, I've noticed another crash while decoding h.264. Assertion failed
in:
h264_refs.c: 482
av_assert(h->long_ref_count + h->short_ref_count <=
h->sps.ref_frame_count);
long_ref_count = 167772170
short_ref_count = -442687480
sps.ref_frame_count = 60829697
This values are odd, I guess. That never haven't happened with latest SVN
revision.
Backtrace is:
{{{
#0 0x3348fa1c in __pthread_kill ()
#1 0x310c63ba in pthread_kill ()
#2 0x310bebfe in abort ()
#3 0x0023c664 in ff_h264_decode_ref_pic_marking (h=0x7271000, gb=<value
temporarily unavailable, due to optimizations>) at
libavcodec/h264_refs.c:482
#4 0x00208744 in decode_slice_header (h=0x7271000, h0=0x7271000) at
libavcodec/h264.c:2917
#5 0x00217018 in decode_nal_units (h=0x7271000, buf=0x5e8afc0 "",
buf_size=409) at libavcodec/h264.c:3697
#6 0x00217a18 in decode_frame (avctx=0xb9ba00, data=0x70b7f0,
data_size=0x700cbe4, avpkt=<value temporarily unavailable, due to
optimizations>) at libavcodec/h264.c:3884
#7 0x0029b3bc in avcodec_decode_video2 (avctx=0xb9ba00, picture=0x70b7f0,
got_picture_ptr=0x700cbe4, avpkt=0x700cdd8) at libavcodec/utils.c:769
}}}
Also, I couldn't reproduce 'put_pixels16 crash' running on x86 (iPhone
simulator). But, assertion failed if I run on ARM or x86 as well.
Probably AV occurs on x86 too, but memory being read is valid. Just in
theory.
As result:
x86 crashes only on av_assert,
ARM crashes on av_assert and put_pixels16 as well.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/407#comment:8>
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