Ulan, could it be related to worker case with http://www.findyourwaytooz.com/ which we debugged during BlinkOn ?

I'll take a look.

Fix in flight: https://codereview.chromium.org/2723003003/

[Auto-generated comment by a script] We noticed that this issue is targeted for M-58; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-58 label, otherwise remove Merge-TBD label. Thanks.

We can merge after getting canary coverage.

+hablich@ for M58 merge review

Your change meets the bar and is auto-approved for M58. Please go ahead and merge the CL to branch 3029 manually. Please contact milestone owner if you have questions.
Owners: amineer@(clank), cmasso@(bling), bhthompson@(cros), govind@(desktop)

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

We are planning to cut Dev RC today (03/08) at 5.00 PM PST. Please merge the CL to M58 branch (3029) ASAP.

Please merge your change to M58 branch 3029 before 5:00 PM PT, Monday (03/13/17) so we can take it in for next week dev release. Thank you!

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/f3243e920a18ab5fc9a96e392a499ff06ed5a224

commit f3243e920a18ab5fc9a96e392a499ff06ed5a224
Author: Ulan Degenbaev <ulan@chromium.org>
Date: Mon Mar 13 08:58:18 2017

Merged: [heap] Do not delay mark-compact by doing scavenge.

Revision: af55a29706703121f83837d0c9020649bb9ec6ce

BUG= chromium:697119 
LOG=N
NOTRY=true
NOPRESUBMIT=true
NOTREECHECKS=true
R=hablich@chromium.org

Review-Url: https://codereview.chromium.org/2750463002 .
Cr-Commit-Position: refs/branch-heads/5.8@{#25}
Cr-Branched-From: eda659cc5e307f20ac1ad542ba12ab32eaf4c7ef-refs/heads/5.8.283@{#1}
Cr-Branched-From: 4310cd02d2160b1457baed81a2f40063eb264a21-refs/heads/master@{#43429}

[modify] https://crrev.com/f3243e920a18ab5fc9a96e392a499ff06ed5a224/src/heap/heap.cc

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

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If there is no pending work, can we tag this as fixed?