[FFmpeg-trac] #5231(avcodec:closed): Crashes in ff_deblock_v_luma_8_sse2

FFmpeg trac at avcodec.org
Fri Oct 7 18:25:10 EEST 2016

#5231: Crashes in ff_deblock_v_luma_8_sse2
             Reporter:  mi           |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:  fixed
             Keywords:  h264 crash   |               Blocked By:
  SIGSEGV                            |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |

Comment (by mi):

 Replying to [comment:24 cehoyos]:
 --- a/configure
 +++ b/configure
 @@ -6202,6 +6202,7 @@ elif enabled llvm_gcc; then
      check_cflags -mllvm -stack-alignment=16
  elif enabled clang; then
      check_cflags -mllvm -stack-alignment=16
 +    check_cflags -mstack-alignment=16
      check_cflags -Qunused-arguments
      check_cflags -Werror=implicit-function-declaration
      check_cflags -Werror=missing-prototypes
 Does this not cause a pessimization in other parts of the code, though?
 That was my worry -- that by setting the stack-alignment to a non-default
 value to solve a problem in one function slows things down (or increases
 memory use) everywhere else...

 > Thanks to Mikhail
 You are welcome. I'll keep your account on the box active. In addition to
 clang-3.4.1 (a.k.a. `cc`) and gcc-4.2.1 (a.k.a. `gcc`), it has the latest
 versions of clang-3.6 (`clang36`), 3.7 (`clang37`), 3.8 (`clang38`) and
 gcc-6 (`gcc6`). You are most welcome -- indeed ''encouraged'' -- to
 routinely test with any/all of these compilers. Thank you!

Ticket URL: <https://trac.ffmpeg.org/ticket/5231#comment:25>
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