Predator and CL could not provide any possible suspects.
Using Code Search for the file, "GrTessellator.cpp" and assigning to the concern owner who might be related.

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

Automatically assigning owner based on suspected regression changelist https://skia.googlesource.com/skia/+/8296e752fa1803dcb8cf97d6ab10bb4f5f5f51f0 (Switch atlas clients over to using absolute texture coordinates (take 2)).

If this is incorrect, please remove the owner and apply the Test-Predator-Wrong-CLs label.

For more information, please see https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md.

The link referenced in the description is no longer valid.

ClusterFuzz has detected this issue as fixed in range 520985:521019.

Detailed report: https://clusterfuzz.com/testcase?key=5627677401939968

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  merge_edges_below
  merge_collinear_edges
  split_edge
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=497456:497511
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=520985:521019

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5627677401939968

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md 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 5627677401939968 is verified as fixed, so closing issue as verified.

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