Predator and CL did not find any possible suspects.
Using Code Search for the file, "Node.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/47ac662b73ab95e33844fe6e6a9ce06104708ebb

@rune -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Test case and stack points to editing.

Lower to Pri-2, because of real world usage of InsertUnorderedList command is low.

ClusterFuzz has detected this issue as fixed in range 455091:455394.

Detailed report: https://clusterfuzz.com/testcase?key=6604411448328192

Fuzzer: bj_broddelwerk
Job Type: linux_lsan_chrome_mp
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x000000000010
Crash State:
  getFlag
  isConnected
  blink::Node::isDescendantOf
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_lsan_chrome_mp&range=297214:297254
Fixed: https://clusterfuzz.com/revisions?job=linux_lsan_chrome_mp&range=455091:455394

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv95RuQMeVmbCROJ5_txcAWlNhS9Wuij7vnUckpwv7Er2EsrXmlGbR-jvhpZ_51FutnplvBCjRW86Ucnofe8aqJ-SYY_0aBB93lc-yTscx3PbxI_e5PDsQVR7uY--hXkcpXhmxguRPv39pcaa_tLz7sfkJDeL_ykOcxgDaeaK7KLXNoFBf0QPSh_1kTKnRoTbFG6ILN8aEfDKEzGrMiy7kTcD6cTgAZnJR2h8Um7Kg63HPLWfHgymTqdc_v4iWtpL__OE5Lg5XUL7GPRApEnk8UyLl8bSvhimxqbDYQWnvVlXjLhJqDzh9anL00DmxrNilpr2o_Tz17wB-f2v9BSyktR7Ed82ABJJ1KYRkv8j5V4S6TxXWkPHUFYT4CMBWVkqdyGEC8v4VId7rlk7gjLUZ_fSKQxIzg?testcase_id=6604411448328192


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 6604411448328192 is verified as fixed, so closing issue.

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