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Message #14577
[Bug 1322784] Re: Firefox crashes in flag_qsort during spellchecker initialization on x86 due to gcc bug
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gcc-4.8 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1322784
Title:
Firefox crashes in flag_qsort during spellchecker initialization on
x86 due to gcc bug
Status in The Mozilla Firefox Browser:
Confirmed
Status in “firefox” package in Ubuntu:
Confirmed
Status in “gcc-4.8” package in Ubuntu:
Confirmed
Bug description:
The most common Firefox crash on Linux in Mozilla's crash-stats system
is crashes in the function flag_qsort.
These crashes occur:
* only on x86 architecture
* only on Ubuntu packages (and not on Mozilla's builds)
* on precise and saucy and trusty (based on kernel versions reported with the crashes)
and appear to be due to a compiler bug in the compiler used to generate Ubuntu's builds. (It could be a common compiler bug triggered by different compiler options or a compiler bug specific to Ubuntu's gcc.)
The analysis that leads to the conclusion that this is a compiler bug
is in https://bugzilla.mozilla.org/show_bug.cgi?id=983817 . In
particular, the compiler is miscompiling an access to an element of an
array of unsigned short as a 32-bit read, and when the unsigned short
in question is the last one in the allocation and that allocation is
aligned so that the byte following has a different 0x100000 bit, this
can lead to crashes.
The most recent (whenever you follow the link) 7 days of crash reports
are available at: https://crash-
stats.mozilla.com/report/list?signature=flag_qsort&product=Firefox&query_type=contains&range_unit=weeks
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