1133405 - crash in shutdownhang | ZwFlushBuffersFile

Status: RESOLVED WORKSFORME

(Core :: Preferences: Backend, defect)

Description

[Hossain Al Ikram [:ikram] (QA Contact)]

This bug was filed from the Socorro interface and is 
report bp-71bab705-349c-4de2-a105-d9f6c2150216.
=============================================================

Comment 2

[Jesper Hansen]

Just met this bug as well.
274 others have met it the last 7 days as well: https://crash-stats.mozilla.com/report/list?product=Firefox&signature=shutdownhang+|+ZwFlushBuffersFile#tab-reports

Comment 3

[Wayne Mery (:wsmwk)]

I'm not finding anything remarkable in the crash reports. It's not a frequent crash. And most users crash only once with no other crashes reported. 

(In reply to Jesper Hansen from comment #2)
> Just met this bug as well.

Under what circumstances?
Have you seen it since?

Comment 4

[Jesper Hansen]

From the documentation it could appear the bug is met when ZwFlushBuffersFile is taking too long to finish since it is done synchronous and the watchdog then kills off firefox while it is shutting down.
I typically meet these shutdown bugs when I update firefox, mostly when I do the large updates because I skipped a few days to get the incremental nightly updates otherwise.
Now this is only a theory, but could it be that the downloaded update takes so long to flush to disk during some preparation operation towards the update that the watchdog simple kicks in?

This is a rather aged laptop, so these factors could contribute towards what we're seeing in this bug

Comment 5

[:Gijs (he/him)]

This looks like pref write shutdown hangs, based on https://crash-stats.mozilla.com/report/index/71bab705-349c-4de2-a105-d9f6c2150216#allthreads . Hopefully some of the stuff in bug 789945 will help here.

Comment 6

[Wayne Mery (:wsmwk)]

#93 crash for thunderbird 38.5.1

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

Crash volume for signature 'shutdownhang | ZwFlushBuffersFile':
 - nightly (version 51): 1 crash from 2016-08-01.
 - aurora  (version 50): 0 crashes from 2016-08-01.
 - beta    (version 49): 77 crashes from 2016-08-02.
 - release (version 48): 64 crashes from 2016-07-25.
 - esr     (version 45): 24 crashes from 2016-05-02.

Crash volume on the last weeks (Week N is from 08-22 to 08-28):
            W. N-1  W. N-2  W. N-3
 - nightly       0       0       1
 - aurora        0       0       0
 - beta         26      20       3
 - release      20      15       7
 - esr           2       1       7

Affected platform: Windows

Crash rank on the last 7 days:
           Browser     Content   Plugin
 - nightly
 - aurora
 - beta    #434
 - release #821
 - esr     #1255

Comment 8

[Milan Sreckovic [:milan] (needinfo for best results)]

Bug 789945 (async pref writes) is in nightly as of 20170615, we can see if it makes a difference here.  Though it seems that most crashes are in beta/release, so it may take a while to see if it makes a difference.

Comment 9

[Milan Sreckovic [:milan] (needinfo for best results)]

Some of these will not go away just from patches in bug 789945; https://crash-stats.mozilla.com/report/index/3bbde643-1b53-48bb-ab47-4e2060170613 seems to be on a suspend event, where we still do a blocking preferences write.

Comment 10

[Wayne Mery (:wsmwk)]

For Thunderbird, in the last 30 days the crash rate has dropped by at least 50% - but not solely because of version 60

Comment 11

[BugBot [:suhaib / :marco/ :calixte]]

Closing because no crashes reported for 12 weeks.