Predator could not provide any possible suspects.
Assigning to concern owner from CL --
https://chromium.googlesource.com/chromium/src/+log/d0261c37e9385b97dbc34fc04fbde774f6be4fa7..0b130fdcf80dfaaeff366efc964678f3415750ca?pretty=fuller

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/675bedf94ebb776c10466ed5b784698e06b1068d

@servolk -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 503469:503500.

Detailed report: https://clusterfuzz.com/testcase?key=5101943965089792

Fuzzer: inferno_twister
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000030
Crash State:
  _pthread_key_global_init
  media::ChunkDemuxer::OnEnabledAudioTracksChanged
  base::debug::TaskAnnotator::RunTask
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=450980:451105
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=503469:503500

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5101943965089792

Additional requirements: Requires HTTP

See https://github.com/google/clusterfuzz-tools for more information.

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

ClusterFuzz testcase 5101943965089792 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.