Using code search, suspected CL could be:
https://chromium.googlesource.com/chromium/src/+/423c887243774bcf76886b34c007c5d68cf93414

Assigning to the CL reviewer haraken@, could you please have a look?

Thank you

Moving this nonessential bug to the next milestone.

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/+/32ab2d4c4cdca33398c7af1e05c058d5f10102ab

commit 32ab2d4c4cdca33398c7af1e05c058d5f10102ab
Author: keishi <keishi@chromium.org>
Date: Fri Jun 10 06:47:50 2016

Fix data race in blink::ThreadHeap::detach

BUG= 618504 

Review-Url: https://codereview.chromium.org/2051053002
Cr-Commit-Position: refs/heads/master@{#399126}

[modify] https://crrev.com/32ab2d4c4cdca33398c7af1e05c058d5f10102ab/third_party/WebKit/Source/platform/heap/Heap.cpp

ClusterFuzz has detected this issue as fixed in range 399117:399141.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4761867058937856

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_tsan_chrome_mp
Platform Id: linux

Crash Type: Data race WRITE 4
Crash Address: 0x7d380000da14
Crash State:
  blink::ThreadHeap::detach
  blink::ThreadState::detachCurrentThread
  blink::WebThreadSupportingGC::shutdown
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_tsan_chrome_mp&range=398351:398496
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_tsan_chrome_mp&range=399117:399141

Minimized Testcase (3.00 Kb): https://cluster-fuzz.appspot.com/download/AMIfv94KrKfRwG5RnD-Obsc6LXTIP532pRJ-3FFGdXLhLf-jrb3dmI833W1J5tBQ9FcsL7LfCGDwV5ZEn5H3hiCAUEOeoO59R-sUjocXJNmAwD8ygNZdF_S4y1tPWrouI_dq9Nn_EdaoiryEEBLdp5pKQ5TzKuRonQ

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/+/32ab2d4c4cdca33398c7af1e05c058d5f10102ab

commit 32ab2d4c4cdca33398c7af1e05c058d5f10102ab
Author: keishi <keishi@chromium.org>
Date: Fri Jun 10 06:47:50 2016

Fix data race in blink::ThreadHeap::detach

BUG= 618504 

Review-Url: https://codereview.chromium.org/2051053002
Cr-Commit-Position: refs/heads/master@{#399126}

[modify] https://crrev.com/32ab2d4c4cdca33398c7af1e05c058d5f10102ab/third_party/WebKit/Source/platform/heap/Heap.cpp

Removing EditIssue view restrictions from ClusterFuzz filed bugs. If you believe that this issue should still be restricted, please reapply the label.

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