Due to the CrossThreadPersistent<> usage introduced in https://codereview.chromium.org/2025783002

Having CrossThreadPersistent<> as members of heap objects means you have to take care of the effects of lazy sweeping.

i.e., annotating the WebSocket object which uses that persistent with EAGERLY_FINALIZE() (next to its DECLARE_TRACE()), will most likely take care of it.

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

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5c41255da77e26cfd08bc1ff29f09214dba3bea4

commit 5c41255da77e26cfd08bc1ff29f09214dba3bea4
Author: sigbjornf <sigbjornf@opera.com>
Date: Mon Jun 13 13:34:34 2016

Promptly release cross-thread websocket bridge/proxy references

To prevent other threads using cross-thread persistents from accessing
to-be-finalized websocket Peer and Bridge abstractions, promptly free
them on becoming garbage. Delaying this until lazy sweeping runs risks
(benignly) touching poisoned objects.

R=
BUG= 619373 

Review-Url: https://codereview.chromium.org/2064633002
Cr-Commit-Position: refs/heads/master@{#399442}

[modify] https://crrev.com/5c41255da77e26cfd08bc1ff29f09214dba3bea4/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.h

ClusterFuzz has detected this issue as fixed in range 399438:399445.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6166696889155584

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_chrome
Platform Id: mac

Crash Type: Use-after-poison READ 8
Crash Address: 0x7eb14bc0c830
Crash State:
  blink::CrossThreadPersistentRegion::prepareForThreadStateTermination
  blink::ThreadState::runTerminationGC
  blink::ThreadHeap::detach
  
Recommended Security Severity: High

Regressed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=398867:398897
Fixed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=399438:399445

Minimized Testcase (2.39 Kb): https://cluster-fuzz.appspot.com/download/AMIfv94I8ZHEi-iQfXaoPWRA9tUYmrgIQyuzeSf75RA4DF9IMnY_ATc0uYU1QSa-Cn_BpWvvw076K9iDEZ4-z-zQpncAJ2JluYfB3Sa5XQNhxoWWYapM2cW7r_ui7mdBrA5wPkoeu3AuQfUTnECNzxqJ16TWoK1mcQ

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.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5c41255da77e26cfd08bc1ff29f09214dba3bea4

commit 5c41255da77e26cfd08bc1ff29f09214dba3bea4
Author: sigbjornf <sigbjornf@opera.com>
Date: Mon Jun 13 13:34:34 2016

Promptly release cross-thread websocket bridge/proxy references

To prevent other threads using cross-thread persistents from accessing
to-be-finalized websocket Peer and Bridge abstractions, promptly free
them on becoming garbage. Delaying this until lazy sweeping runs risks
(benignly) touching poisoned objects.

R=
BUG= 619373 

Review-Url: https://codereview.chromium.org/2064633002
Cr-Commit-Position: refs/heads/master@{#399442}

[modify] https://crrev.com/5c41255da77e26cfd08bc1ff29f09214dba3bea4/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.h

 Issue 620754  has been merged into this issue.

Fix already in M53, removing ReleaseBlock-Beta.

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

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

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