Predator and CL did not provide any possible suspects.
Using Code Search for the file, "layoutmulticolumnset.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/ed375c02e956ef832e8ed6223435f0d78d6bdf77

@dcheng -- 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 449940:449957.

Detailed report: https://clusterfuzz.com/testcase?key=5627268740415488

Fuzzer: bj_broddelwerk
Job Type: windows_syzyasan_chrome
Platform Id: windows

Crash Type: UNKNOWN
Crash Address: 0x000000af
Crash State:
  WTF::Vector<blink::PluginInfo,0,WTF::PartitionAllocator>::at
  blink::LayoutMultiColumnSet::isPageLogicalHeightKnown
  blink::LayoutMultiColumnSet::newFragmentainerGroupsAllowed
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=449612:449627
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=449940:449957

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv97MhbMdskJdrXuzgfzjGb3l9gGjv0FyEOmQA75eAMbPkQBNWEqaETahfpnZvJBl5je83m4A_mOtKkHAm2xebHtN47cHDoo6mqy57WsJdUO07Tvl9jp34p_59wOI0H_vs81fBb3VM5ssTs_zeK4oBxHNwDTYA_XNAORbUjUzJDErgqcSXDpc3HScumzBRUMKFu7dzk0zB7zs92URFuaJ5p8n5IB4gpjZ0r01DJ7BPWVh3H3VoTeTOlJ3yzUz1G-MfdXgJCtG15S2eNtv1u9HbkkXQwlBZZxU5z8Czgi4d4d80-TSfcxCvCofSA_LCRGd_qyLrTrJiOHNoTW1b7UY2MwGkLDyCdnbP2Rm3PO3wrIJhOjwO2CNM2vnH49lh4i2y5ZDGr9I36RaP17ZRMh09IEFpjyA2g?testcase_id=5627268740415488


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs 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 5627268740415488 is verified as fixed, so closing issue.

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