touch-packages team mailing list archive

["L. David Baron" <dbaron@xxxxxxxxxx>]

It's an issue with something in the compilation toolchain that Ubuntu
uses to compile the Firefox builds that Ubuntu ships.  I don't know what
part of that toolchain specifically (whether it's base gcc or Ubuntu's
gcc modifications or wrappers). What's the right place to put such bugs?
It's by far the most frequent crash affecting Firefox on Ubuntu.

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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:
  Incomplete

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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