Predator and CL could not provide any possible suspects.
Using the code search for the file, “cttfontdesc.cpp” assigning to owner concerned from GIT blame.
Suspecting Commit#
https://pdfium.googlesource.com/pdfium.git/+/962760426dcb1801683e6fd91c4f3650eea51155

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

Also, CC'ing tsepez@ for the recent changes made to the file - cttfontdesc.cpp

Thank You.

ClusterFuzz has detected this issue as fixed in range 619153:619154.

Detailed report: https://clusterfuzz.com/testcase?key=6320019046400000

Fuzzer: ifratric_pdf_generic
Job Type: linux_debug_chrome
Platform Id: linux

Crash Type: ASSERT
Crash Address: 
Crash State:
  m_RefCount == 0
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_debug_chrome&range=618786:618787
Fixed: https://clusterfuzz.com/revisions?job=linux_debug_chrome&range=619153:619154

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6320019046400000

See https://github.com/google/clusterfuzz-tools for instructions to reproduce this bug locally.

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

ClusterFuzz testcase 6320019046400000 is verified as fixed, so closing issue as verified.

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

Not sure why this bug appeared and disappeared.