Through code search on file system_tray.cc, suspected CL is
https://chromium.googlesource.com/chromium/src/+/589a5bec0318f116d4f269facc6d9b6b79fda9c1
sky@, Could you please clarify below issue?.
Thank you.

Oshima added this check to help track what I think is the same clusterfuzz report. Specifically 651242. Passing to Oshima.

warx@, let's have a chat today.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/85eb99035fea825bca1ecb8b12b36fb12f6065ea

commit 85eb99035fea825bca1ecb8b12b36fb12f6065ea
Author: warx <warx@chromium.org>
Date: Thu Mar 30 01:23:05 2017

cros: do not try to activate system tray bubble if it is in process of closing

Changes:
SystemTray::CloseSystemBubble() !activating_ is caught, reported in  crbug.com/702267 . Widget::IsClosed() indicates a widget is in process of closing, so we use this to do the check in ActivateBubble().
This is speculative fix for the bug.

BUG= 702267 
TEST=none

Review-Url: https://codereview.chromium.org/2785823002
Cr-Commit-Position: refs/heads/master@{#460616}

[modify] https://crrev.com/85eb99035fea825bca1ecb8b12b36fb12f6065ea/ash/common/system/tray/system_tray.cc

A speculative fix is just landed. Assign back to mummareddy@. Please assign back to me if CHECK failure still happens. Thanks!

ClusterFuzz has detected this issue as fixed in range 460544:460618.

Detailed report: https://clusterfuzz.com/testcase?key=4818830703722496

Fuzzer: cdiehl_peach
Job Type: linux_asan_chrome_chromeos
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  !activating_ in system_tray.cc
  ash::SystemTray::ActivationObserver::OnWindowActivated
  ash::WmShell::OnWindowActivated
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_chromeos&range=423512:423881
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_chromeos&range=460544:460618

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv94eFJVyeUj73nJy5tTmZhPoU2FM5M-AQwaHJGxoVKEmgIu4nYcMdbDZyRenl5UQnbGoRehhuhwuGmctPlVNZgyBnODXQL4ZpSY6I7XlvJQCIFqhH76wzcPteT82R5Yrnuegy4Qn0H3pu63c6MCwpIhBMEzbZo7uPkJTqFZ0lAl5I4yyImOh0NTCn8w1_33zQMVQjasdWh7HWCEBBxIBhxb95WKkkQD8wyfzZ6RrLTd9SVHn4PgSTkc4XsR9wzUegz8aS6m3Mr6Lh66BZ7Ryz7oultBDwwRCeA5rxnJueB4RvgxlJRS00wSw5XuleKjB03fx9IrNURcd15yrfs4Fy1Jbicb8jeu19tsI08Qqk0D3efFg-Z1Va63PeFpalP_2raTZKfUAALEYOd5dPW7kbRjIYGf9sQ?testcase_id=4818830703722496


Additional requirements: Requires Gestures

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 4818830703722496 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

Thank you warx@ for fixing this one. will assign if it fails again.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/78581ae9b930e09bb0640986eb693d703dde905c

commit 78581ae9b930e09bb0640986eb693d703dde905c
Author: warx <warx@chromium.org>
Date: Mon Apr 03 20:39:24 2017

cleanup: Remove the system tray bubble crash investigation CHECK

Changes:
Now that Clusterfuzz reports crash fixed in  crbug.com/702267 , it is time to remove the check induced in crrev.com/2392183002.

BUG= 702267 
BUG= 651242 
TEST=none

Review-Url: https://codereview.chromium.org/2789653002
Cr-Commit-Position: refs/heads/master@{#461523}

[modify] https://crrev.com/78581ae9b930e09bb0640986eb693d703dde905c/ash/common/system/tray/system_tray.cc
[modify] https://crrev.com/78581ae9b930e09bb0640986eb693d703dde905c/ash/common/system/tray/system_tray.h