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

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Likely due to https://chromium-review.googlesource.com/1014606
Possibly a duplicate of 834850.

ClusterFuzz has detected this issue as fixed in range 552439:552443.

Detailed report: https://clusterfuzz.com/testcase?key=4696826742308864

Fuzzer: inferno_twister
Job Type: linux_ubsan_vptr_content_shell_drt
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x375b04c50000
Crash State:
  Bad-cast to const blink::InlineTextBox from blink::InlineBox
  blink::LeftPositionOf
  blink::SelectionModifier::ModifyMovingLeft
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=551491:551503
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=552439:552443

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4696826742308864

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