On 10/04/2013 03:55 PM, Mike Galbraith wrote:
On Fri, 2013-10-04 at 13:28 +0200, Sebastian Andrzej Siewior wrote:
On 10/04/2013 01:16 PM, Mike Galbraith wrote:
Manfred's race fix also kills loop, and thereby the -rt livelock, so the
only question is does -rt want to use his completion wakeup scheme, and
does it want to do something about spin_unlock_wait() unconditionally
grabbing/releasing every lock in the array.
So his patches went into v3.11 or so right? So all -RT released post
this point will have it fixed right?
Most fixes have gone into master. There's still at least one in the
pipe, ipc/sem.c: synchronize semop and semctl with IPC_RMID, and I
_think_ there's still one open issue.
<quoting Manfred>
And now new:
1) ipc/namespace.c:
free_ipcs() still assumes the "old style" free calls:
rcu_lock and ipc_lock dropped within the callback.
freeary() was converted - but free_ipcs was not updated.
Thus:
Closing a namespace with sem arrays and threads that are waiting
on
the array with semtimedop() and bad timing can deadlock the semtimedop
thread.
(i.e.: spin_lock() waiting forever).
</quoting Manfred>
That one was a false alarm, i.e. everything is fixed in -mm.
--
Manfred
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