On 7/6/2015 4:34 PM, Vladan D wrote:
Background: Firefox shutdown hangs are turned into shutdown crashes by a
watchdog thread [1] that forces a crash if shutdown hasn't completed within 1
minute. Thanks to the watchdog and the Windows profile unlocker [2], shutdown
hangs aren't as frustrating as they used to be. However, shutdown hangs might
still be causing data loss and they are indicative of potentially-serious bugs
in the code.
According to this graph of Firefox crash rate history, shutdown hangs (crashes)
make up about one third of all browser crashes [3]:
https://crash-analysis.mozilla.com/rkaiser/crash-report-tools/longtermgraph/?fxrel
I've been told shutdown hangs often don't get enough attention.
Should fixing shutdown hangs be higher priority?
And if so, should we allow features with shutdown hangs to be released?
Notes:
1. Force Firefox crash if shutdown hangs
https://bugzilla.mozilla.org/show_bug.cgi?id=1038342
2. win32 implementation of nsIProfileUnlocker
https://bugzilla.mozilla.org/show_bug.cgi?id=286355
3. The graph above shows that the overall crash rate jumped up by roughly a third when
the watchdog code shipped in Firefox 36. Hover over the "36" box on the blue
line
Windows mochitest-bc shutdown hangs have been on of the top oranges in
our automation for months now. See bug 1121145. Would be great if we
could get more eyes on the problem.
-Ryan
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