Unfortunately after patching our ffmpeg 8.1 with
https://source.ffmpeg.org/gitweb/ffmpeg.git/commit/3b939ced79655ed084e6bebc493fa8b11e9b9d8b
I still see this crash on x265 created hevc + alpha file:
Thread 301 "av:hevc:df1" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff82ffd700 (LWP 6407)]
alloc_frame (s=s@entry=0x7fff401ae8c0, l=l@entry=0x7fff401af698) at
libavcodec/hevc/refs.c:194
194 AVFrame *base = s->layers[0].cur_frame->f;
(gdb) bt full
#0 alloc_frame (s=s@entry=0x7fff401ae8c0, l=l@entry=0x7fff401af698)
at libavcodec/hevc/refs.c:194
alpha = 0x7fff0406bdc0
base = <optimized out>
frame = <optimized out>
vps = <optimized out>
i = <optimized out>
j = <optimized out>
ret = <optimized out>
#1 0x000000000100b7f3 in ff_hevc_set_new_ref
(s=s@entry=0x7fff401ae8c0, l=l@entry=0x7fff401af698, poc=123)
at libavcodec/hevc/refs.c:226
ref = <optimized out>
i = <optimized out>
no_output = <optimized out>
#2 0x0000000000fd7dd6 in hevc_frame_start (nal_idx=1,
l=0x7fff401af698, s=0x7fff401ae8c0)
at libavcodec/hevc/hevcdec.c:3337
pps = 0x7fff402c5640
new_sequence = 0
prev_layers_active_output = 1
ret = <optimized out>
sps = 0x7fff402c0640
pic_size_in_ctb = 2806
prev_layers_active_decode = 3
#3 decode_slice (gb=0x7fff82ffccc0, nal_idx=1, s=0x7fff401ae8c0) at
libavcodec/hevc/hevcdec.c:3580
---Type <return> to continue, or q <return> to quit---
layer_idx = <optimized out>
l = 0x7fff401af698
ret = <optimized out>
#4 decode_nal_unit (nal_idx=1, s=0x7fff401ae8c0) at
libavcodec/hevc/hevcdec.c:3663
nal = <optimized out>
gb = {
buffer = 0x7fff74000e9e
"\002\t\244\366W\346\024\210\022\003\001*$\004A\370\326\372\303\246\260\314\353\214c).z_=\351\021~\304\f\020'\247\222#gb\033/_\325H\261L\211v\037h\206\301\272\256[\"\377/\204|W\002pm\347\265\322\177e\030\220K\216!\224\b+mI\216\017\307\020\177\215#m\353\200\235W\215E\352K\031\275k\346\322\032g>'0\246C\274U\263v\236\215s\265y\312\245\t\255\203T\376\213Y\037\177`y\005\320\016\022R\036\035I\261\204w\202\271\311\311%S\313\322\370\306\250\241\065JW\224>1\247\234-_\243\317XO\361\003
\031\363\246X\363(s\252\214Pf\331\307o\352\266\201/\360c\020\fo\331\004\064/b"...,
index = 136,
size_in_bits = 5878, size_in_bits_plus8 = 5886}
ret = <optimized out>
#5 decode_nal_units (length=<optimized out>, buf=<optimized out>,
s=0x7fff401ae8c0) at libavcodec/hevc/hevcdec.c:3779
nal = <optimized out>
i = 1
ret = <optimized out>
eos_at_start = <optimized out>
flags = <optimized out>
#6 hevc_receive_frame (avctx=<optimized out>, frame=<optimized out>)
at libavcodec/hevc/hevcdec.c:3881
s = 0x7fff401ae8c0
avci = <optimized out>
avpkt = <optimized out>
---Type <return> to continue, or q <return> to quit---
ret = <optimized out>
sd = <optimized out>
sd_size = 0
#7 0x0000000000f1263f in ff_decode_receive_frame_internal
(avctx=avctx@entry=0x7fff402c6c00,
frame=frame@entry=0x7fff880f2f40) at libavcodec/decode.c:625
avci = 0x7fff402c6fc0
ret = <optimized out>
#8 0x000000000117b47a in frame_worker_thread (arg=0x7fff4006ff00) at
libavcodec/pthread_frame.c:291
ret = 0
p = 0x7fff4006ff00
avctx = 0x7fff402c6c00
#9 0x00007ffff540755a in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#10 0x00007fffedd02e5f in clone () from /lib64/libc.so.6
No symbol table info available.
There was another patch moving some of those i local variables into
loop, but I am not sure if or how it may help here ?
Will test more. (I wonder if disabling threaded decode will avoid this?)
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