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

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

ClusterFuzz has detected this issue as fixed in range 422899:423265.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5881943935942656

Fuzzer: therealholden_worker
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x3aa36f9224d8
Crash State:
  Bad-cast to blink::Supplementable<blink::WorkerClients> from invalid vptr
  blink::Supplement<blink::WorkerClients>::from
  blink::LocalFileSystem::from
  
Recommended Security Severity: High

Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_chrome&range=422132:422169
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_vptr_chrome&range=422899:423265

Unminimized Testcase: https://cluster-fuzz.appspot.com/download/AMIfv97_p7YR8dARrbgoNGYBJkpUrC8M8yZ08A7dHWqE-sQFM9o-mAq5E5ZgiKyK5TvpGz4DUXI0ILWxyJFh899aOiST-Zs64Pin9iIqO-1am_yAESHmozCI3RLVmvmTThkioVGMRT1gykBVE1vTvWRiikcPi5SJcg?testcase_id=5881943935942656


Additional requirements: Requires HTTP

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.

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