ossu, could you please take a look, or assign this to the right person? thanks!

This issue is a security regression. If you are not able to fix this quickly, please revert the change that introduced it.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I'm having a look at it but have not been able to pin it down yet.

Have been trying (and succeeding) to replicate this locally. Looks like it appeared with my CL changing WebRTC encoder management[1]. Running a Chrome built with WebRTC ToT, I can no longer reproduce it. Most likely fixed by henrika@'s CL[2].

I'll reassign to you, henrika@ to keep an eye on over the next few days. Once the next WebRTC is imported into Chromium, the problem should go away by itself.

[1] https://codereview.webrtc.org/2705093002
[2] https://codereview.webrtc.org/2861583005

Makes sense. Can we do anything else?

Nope. Looks like your changes have made it in now, so we should be all set. I've tried to re-run the task to get an all-clear from the bot, but it seems unable to reproduce it even with a version it previously could. I expect we'll have to wait for it to figure this out on its own.

Should we not mark is as fixed then? I am not sure what to track otherwise actually.

We probably should. I was hoping ClusterFuzz would do that for us, but that may take too long considering this is a high prio bug.

ClusterFuzz has detected this issue as fixed in range 469194:469222.

Detailed report: https://clusterfuzz.com/testcase?key=5467756974833664

Fuzzer: phoglund_webrtc_peerconnection
Job Type: linux_tsan_chrome_mp
Platform Id: linux

Crash Type: Use of an invalid mutex
Crash Address: 
Crash State:
  pthread_mutex_unlock
  rtc::CritScope::~CritScope
  webrtc::voe::Channel::ProcessAndEncodeAudioOnTaskQueue
  
Sanitizer: thread (TSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_tsan_chrome_mp&range=468550:468553
Fixed: https://clusterfuzz.com/revisions?job=linux_tsan_chrome_mp&range=469194:469222

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5467756974833664


Additional requirements: Requires HTTP

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot