As per code search on file render_frame_host_impl.cc, suspected CL could be

https://chromium.googlesource.com/chromium/src/+/43c38f1248a0e5f70c025675cd0de7c2f4628f0d
lukasza@, could you please take a look and help us correct owner if it is not your related changes.

ClusterFuzz has detected this issue as fixed in range 401832:401850.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6333169653776384

Fuzzer: ipc_fuzzer_gen
Job Type: linux_cfi_chrome_ipc
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  SiteIsolationPolicy::AreCrossProcessFramesPossible() in render_frame_host_impl.c
  content::RenderFrameHostImpl::OnDispatchLoad
  _ZN3IPC16DispatchToMethodIN7content19RenderFrameHostImplEMS2_FvvEvSt5tupleIJEEEE
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_cfi_chrome_ipc&range=401806:401832
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_cfi_chrome_ipc&range=401832:401850

Minimized Testcase (0.07 Kb): https://cluster-fuzz.appspot.com/download/AMIfv95kb-6Ll_bbye7AYqUJP1PrgOv7Vb5dtsLWWgYQTYWlkYNyaxVm795BpeEzrG3NeuAA16znMSWvtvisNUtPE91YpMIr44H9Jf0KdhRf_tUIDTkTyTCe07idlOk67ViDLJDBFa4fYT9cTMvZTukkOhqAxCvVjw?testcase_id=6333169653776384

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 is verified as fixed, closing issue.

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