Predator and CL could not provide any possible suspects.
Using the code search for the file, “partition_alloc.h” assigning to concern owner from GIT blame.
Suspecting Commit#
https://pdfium.googlesource.com/pdfium.git/+/79e548eb98caefd3ea0f0e4806a7abca6654e7dc%5E%21/third_party/base/allocator/partition_allocator/partition_alloc.h

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

The commit given in #1 doesn't make any sense; GetHandleVerifier doesn't even appear in PDFium. It could be that a Chromium renderer embedding PDFium calls GetHandleVerifier, which can call `new ActiveVerifier`, which might...? call into Partition Alloc.

But this looks like allocation simply failed due to e.g. OOM.

ClusterFuzz testcase 6034421391294464 is still reproducing on tip-of-tree build (trunk).

If this testcase was not reproducible locally or unworkable, ignore this notification and we will file another bug soon with hopefully a better and workable testcase.

Otherwise, if this is not intended to be fixed (e.g. this is an intentional crash), please add ClusterFuzz-Ignore label to prevent future bug filing with similar crash stacktrace.

ClusterFuzz has detected this issue as fixed in range 513950:513982.

Detailed report: https://clusterfuzz.com/testcase?key=6034421391294464

Fuzzer: inferno_twister
Job Type: windows_asan_chrome
Platform Id: windows

Crash Type: CHECK failure
Crash Address: 
Crash State:
  result || flags & PartitionAllocReturnNull in partition_alloc.h
  GetHandleVerifier
  GetHandleVerifier
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=500786:500791
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=513950:513982

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6034421391294464

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.