Fix race condition in InternalFFMpegRegister initialization.#25419
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asmorkalov merged 3 commits intoopencv:4.xfrom Apr 17, 2024
Merged
Fix race condition in InternalFFMpegRegister initialization.#25419asmorkalov merged 3 commits intoopencv:4.xfrom
asmorkalov merged 3 commits intoopencv:4.xfrom
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| if(!threadSafe) | ||
| lock.lock(); | ||
| static InternalFFMpegRegister instance; | ||
| initLogger_(); // update logger setup unconditionally (GStreamer's libav plugin may override these settings) |
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I take a look on the comment.
It comes from this commit: 7baf2e8
which commit message says "repair FFmpeg logger settings on each .open() call"
@mshabunin Do you remember which reproducer we had for this case?
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@mshabunin Do you remember which reproducer we had for this case?
No, I don't 🙁
PR was #19661
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FYI, the stack trace we have is (line numbers might be off by a few units; if needed I can get the exact code references): |
opencv-alalek
approved these changes
Apr 16, 2024
initLogger_ does not check if the logger has been initizalized before and it might initialize it several times from different threads, racing with other threads that are logging.
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klatism
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May 17, 2024
Fix race condition in InternalFFMpegRegister initialization. opencv#25419 initLogger_ does not check if the logger has been initizalized before and it might initialize it several times from different threads, racing with other threads that are logging. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work
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initLogger_ does not check if the logger has been initizalized before and it might initialize it several times from different threads, racing with other threads that are logging.
Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request