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

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/+/deb6bb60b6d562719d04c6a564717b332d9c55bd (Let SelectionPaintRange iterator iterate on a flat tree.).

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.

ClusterFuzz has detected this issue as fixed in range 571075:571076.

Detailed report: https://clusterfuzz.com/testcase?key=4780738051047424

Fuzzer: bj_broddelwerk
Job Type: windows_asan_content_shell
Platform Id: windows

Crash Type: Use-after-poison READ 8
Crash Address: 0x7ee7bc401c50
Crash State:
  blink::HTMLSlotElement::DetachLayoutTree
  blink::ContainerNode::DetachLayoutTree
  blink::ShadowRoot::DetachLayoutTree
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_content_shell&range=569167:569168
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_content_shell&range=571075:571076

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4780738051047424

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