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[Andy Smith <1327300@xxxxxxxxxxxxxxxxxx>]

Seems to be causing Firefox to completely lock up as soon as either
right mouse button is clicked (for context menu) or a menu item is
selected. Reverting to earlier kernel version makes the problem go away
for me.

Also manifests itself using the latest stable release of Firefox (30.0)
as downloaded from firefox.com, so I believe is not a Firefox issue.

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https://bugs.launchpad.net/bugs/1327300

Title:
  Regression in commit 8e4e453d548e3c24e9070eda23c52f210951b921

Status in “linux” package in Ubuntu:
  Invalid
Status in “linux” source package in Lucid:
  Fix Committed

Bug description:
  Phil Turnbull reported a problem with the Lucid (2.6.32) backport of
    futex: Always cleanup owner tid in unlock_pi
    commit: 8e4e453d548e3c24e9070eda23c52f210951b921

  In patches-2.6.32.tgz:patches/0003-futex-Always-cleanup-owner-tid-in-unlock_pi.$
  there is this change (ignoring whitespace changes):

          curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
  -
  -               if (curval == -EFAULT)
  +       if (curval)
                  ret = -EFAULT;

  which seems to change the behaviour of the function.

  The purpose of the return value of cmpxchg_futex_value_locked changed
  in

  37a9d912b24f96a0591 "futex: Sanitize cmpxchg_futex_value_locked API"

  which is not included in 2.6.32. This patch changes the return value to a
  status code, but in 2.6.32 the return value is the value of the futex or
  -EFAULT. With this backported patch, any futex with a non-zero value will
  return -EFAULT.

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