[FFmpeg-trac] #8669(avcodec:new): Data race in mpegvideo.c and mpeg4video.h

FFmpeg trac at avcodec.org
Sun May 24 20:08:30 EEST 2020

#8669: Data race in mpegvideo.c and mpeg4video.h
             Reporter:  Zu-Ming     |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  race        |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by Zu-Ming):

 Replying to [comment:2 cehoyos]:
 > How did you reproduce the issue an how can we reproduce it?

 I reproduce it using breakpoint. Specifically, I used llvm to instrument
 the code, and set breakpoint before the race instruction pair. By
 controling the breakpoints, I made the race instructions be executing
 concurrently. And then, I checked their access addresses and found they
 are same. So I am sure it is a real race .

 It may be hard for you to reproduce it easily. Gdb may be a good choice
 but it may require some your manual effort to set the breakpoint.

Ticket URL: <https://trac.ffmpeg.org/ticket/8669#comment:3>
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