Predator and CL could not provide any possible suspects.
Using the code search for the file, “TextIterator.cpp” assigning to concern owner from GIT blame.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/c8070f461957f5f2aaaf41147538ebe811b4abce

@xiaochengh  -- Could you please look into this issue, kindly reassign if it has nothing to do with your changes.
Thank You.

Lower to P3 due to low usage of InsertUnorderedListCommand

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a7ece4a8392ad07bcbd813dd01c3641d58781388

commit a7ece4a8392ad07bcbd813dd01c3641d58781388
Author: tanvir.rizvi <tanvir.rizvi@samsung.com>
Date: Wed Jan 10 09:17:08 2018

InsertListCommand crash while cleanup

InsertListCommand tries to clean the destination
node during one scenario, when on the
table element webkit-appearance property is
applied.
Because of this DCHECK is reached.

Bug:  798176 
Change-Id: Id5c60e2cf4c8b95c746456d663aacea2f64d07ab
Reviewed-on: https://chromium-review.googlesource.com/856416
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Tanvir Rizvi <tanvir.rizvi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#528266}
[modify] https://crrev.com/a7ece4a8392ad07bcbd813dd01c3641d58781388/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp
[modify] https://crrev.com/a7ece4a8392ad07bcbd813dd01c3641d58781388/third_party/WebKit/Source/core/editing/commands/InsertListCommandTest.cpp

ClusterFuzz has detected this issue as fixed in range 528265:528270.

Detailed report: https://clusterfuzz.com/testcase?key=5441234708725760

Fuzzer: bj_broddelwerk
Job Type: windows_asan_chrome_no_sandbox
Platform Id: windows

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::TextIteratorAlgorithm<class blink::EditingAlgorithm<class blink::NodeTrav
  blink::TextIteratorAlgorithm<class blink::EditingAlgorithm<class blink::NodeTrav
  blink::CompositeEditCommand::MoveParagraphs
  
Sanitizer: address (ASAN)

Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=528265:528270

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5441234708725760

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.

ClusterFuzz testcase 5441234708725760 is verified as fixed, so closing issue as verified.

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