[FFmpeg-trac] #1940(avutil:new): segfault on av_malloc()
FFmpeg
trac at avcodec.org
Wed Nov 21 15:36:58 CET 2012
#1940: segfault on av_malloc()
-------------------------------------+-------------------------------------
Reporter: | Type: defect
leandrosansilva | Priority: critical
Status: new | Version: git-
Component: avutil | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I'm using ffmpeg in a c++ project and at a point at my code I try to call
av_malloc() bu it results in a segfault. As I'm using ubuntu amd64 arch, I
don't think I don't have enough memory. It's also strange it happens only
in one point of my code, where I create a new pointer and just assign the
return of av_malloc() (here the size is 460800) as parameter. It causes a
segfault before return. It makes me think if libav keeps a internal state
of general memory alocation system...
The ffmpeg version I'm using is the commit
e94f4294746d50ef7b25993fa59a9be32023d3bb checked out today (21th November)
from master branch.
The backtrace related to this problem is:
{{{
Program received signal SIGSEGV, Segmentation fault.
_int_malloc (av=0x7ffff6b63720, bytes=460880) at malloc.c:3868
3868 malloc.c: Arquivo ou diretório não encontrado.
(gdb) bt full
#0 _int_malloc (av=0x7ffff6b63720, bytes=460880) at malloc.c:3868
p = <optimized out>
iters = <optimized out>
nb = 460896
idx = <optimized out>
bin = <optimized out>
victim = 0x1d6fae0
size = 7740398493674188424
victim_index = <optimized out>
remainder = 0x1de0340
remainder_size = <optimized out>
block = 4
bit = 1073741824
map = <optimized out>
fwd = <optimized out>
bck = <optimized out>
errstr = 0x0
__func__ = "_int_malloc"
#1 0x00007ffff682c801 in _int_memalign (av=0x7ffff6b63720, alignment=32,
bytes=<optimized out>) at malloc.c:4492
nb = 460816
m = <optimized out>
p = <optimized out>
brk = <optimized out>
newp = <optimized out>
newsize = <optimized out>
leadsize = <optimized out>
remainder = <optimized out>
remainder_size = <optimized out>
size = <optimized out>
__func__ = "_int_memalign"
#2 0x00007ffff682eac6 in __GI___libc_memalign (alignment=32,
bytes=460800) at malloc.c:3102
ar_ptr = <optimized out>
p = <optimized out>
hook = <optimized out>
__func__ = "__libc_memalign"
#3 0x00007ffff682fd09 in __posix_memalign (memptr=0x7fffffffdc88,
alignment=<optimized out>, size=<optimized out>) at malloc.c:5038
mem = <optimized out>
hook = <optimized out>
#4 0x0000000000cfb22a in av_malloc (size=460800) at libavutil/mem.c:97
ptr = 0x0
#5 av_mallocz (size=460800) at libavutil/mem.c:203
(...) my code bt (...)
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1940>
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