Predator and CL could not provide any possible suspects.
Using the code search for the file, “platform_font_linux.cc” assigning to concern owner from GIT blame.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/393cc78cf982dacd721f3616b0afb752d42d9c77

@jonross -- Could you please look into this issue, kindly reassign if it has nothing to do with your changes.
Thank You.

My change logs a fatal error of system resource files not being available.

This can be caused by:
  -font_loader service shutting down/crashing
  -overall shutdown of the browser triggering while trying to load fonts
  -files not being on the system

The first two would hopefully have crashes elsewhere in the logs. The later would require debugging the machine.

However this CHECK is just a symptom of the problem this clusterfuzz case has uncovered. It will need further triaging to find the root cause

mmoroz@ -- Could you please help in this for C#2.

Thanks in advance!

I'm afraid we don't have a reliably way to reproduce this crash, since it's marked as non-reproducible. However, we see that crash happening quite often, this is why it got reported. Probably the best advice here would be to try landing a speculative fix based on the stacktrace, if possible. Then, after a couple of days, check Statistics section on ClusterFuzz report page: https://clusterfuzz.com/v2/testcase-detail/4504570213695488?noredirect=1

If the fix worked, total number of crashes should significantly drop.

CC'ing Marty in case there is anything else we can do.

ClusterFuzz has detected this issue as fixed in range 514495:514498.

Detailed report: https://clusterfuzz.com/testcase?key=4504570213695488

Fuzzer: jsbell_serviceworker
Job Type: linux_msan_chrome
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  InitDefaultFont(). Could not find the default font in platform_font_linux.cc
  gfx::PlatformFontLinux::PlatformFontLinux
  gfx::PlatformFont::CreateDefault
  
Sanitizer: memory (MSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_chrome&range=510349:510357
Fixed: https://clusterfuzz.com/revisions?job=linux_msan_chrome&range=514495:514498

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4504570213695488

Additional requirements: Requires Gestures

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 4504570213695488 is verified as fixed, so closing issue as verified.

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