Predator and CL did not provide any possible CL.
Using Code Search for the file, "LayoutSlider.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/a333b76c54e0058b23fa8f2ffb6a64dc53fbb6e1

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

We don't fix crashes by internals.shadowRoot().

ClusterFuzz has detected this issue as fixed in range 474922:474938.

Detailed report: https://clusterfuzz.com/testcase?key=6448187155152896

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000010
Crash State:
  blink::Node::GetLayoutBox
  blink::LayoutSlider::UpdateLayout
  blink::LayoutBlockFlow::LayoutInlineChildren
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=338204:338244
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=474922:474938

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6448187155152896


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.