kernel 2.6.32-62 fixed this for me. Many thanks!
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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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