User Advocacy reports that users of Firefox 29 are seeing Firefox take a
long time to shut down and that they are getting the "Firefox is already
running" error message (i.e. a locked profile) when they try to relaunch
Firefox.
Can anyone think of any bugs or patches from that time frame that might
be responsible?
---
We analyzed some of the Telemetry data to try to identify the source of
this regression:
1. The time it takes Firefox to shut down "cleanly" (i.e. successfully)
is basically unchanged across versions: http://mzl.la/1hCbMMX
2. The distribution of clean shutdown times in Firefox 27+28+29 has an
odd secondary peak at 5-8 seconds:
* Firefox 26 has a normal distribution: http://mzl.la/1hCezFO (see the
histogram on the bottom of the page)
* Firefox 27 has a secondary peak between 5 & 8 seconds:
http://mzl.la/1hCeFxb
* Firefox 28: http://mzl.la/1hCeHVO
* Firefox 29: http://mzl.la/1qkiXcD
3. We have information on the number of startups that failed because of
a locked profile via the SIMPLE_MEASURES_FAILEDPROFILELOCKCOUNT
Telemetry probe. These failed startups are preceded by an unclean shutdown.
There was an an increase in the proportion of "failed startups" from
Firefox 28 to Firefox 29 although there was also a major improvement in
Firefox 26:
* Firefox 24: 2.46M startups were preceded by at least one "locked
profile" failed startup out of a total 319.58M normal startups. This is
a failure rate of 0.770%
* Firefox 25: 3.16M / 406.83M = 0.777%
* Firefox 26: 3.33M / 468.88M = 0.710%
* Firefox 27: 1.26M / 422.52M = 0.298%
* Firefox 28: 1.03M / 341.73M = 0.301%
* Firefox 29: 276.08K / 71.56M = 0.385%
In other words, the proportion of failed startups increased by a quarter
in Firefox 29 vs Firefox 28.
4. We did not find any correlations between users getting the "locked
profile" message and any particular extension. There is also no
correlation with any Flash plug-in version.
5. We also looked at the stacks of temporary hangs (aka "chrome hangs")
occurring around shutdown time and we did not find any smoking guns there.
Any ideas?
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