Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/b6ec484f7d3153135b9640117a89252ff45829b8 (Launch Incremental Shadow DOM).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Let me merge this into 844301.
I confirmed that the WIP CL there fixed this.

ClusterFuzz has detected this issue as fixed in range 560220:560221.

Detailed report: https://clusterfuzz.com/testcase?key=5508919674535936

Fuzzer: bj_broddelwerk
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x3a640da1cba0
Crash State:
  Bad-cast to blink::LayoutObject from invalid vptr
  blink::TextOffsetMapping::InlineContents::NextOf
  blink::TextOffsetMapping::ForwardRange::Iterator::operator++
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=559423:559424
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=560220:560221

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5508919674535936

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.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot