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From: Benjamin Gilbert <>
To: Heiko Carstens <>
Cc: Srivatsa Vaddagiri <>,, Ingo Molnar <>,
	Gautham shenoy <>, Andrew Morton <>
Subject: Re: Failure to release lock after CPU hot-unplug canceled
Date: Tue, 09 Jan 2007 11:34:40 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Heiko Carstens wrote:
> On Tue, Jan 09, 2007 at 05:57:40PM +0530, Srivatsa Vaddagiri wrote:
>> On Tue, Jan 09, 2007 at 01:17:38PM +0100, Heiko Carstens wrote:
>>> The workqueue code grabs a lock on CPU_[UP|DOWN]_PREPARE and releases it
>>> again on CPU_DOWN_FAILED/CPU_UP_CANCELED. If something in the callchain
>>> returns NOTIFY_BAD the rest of the entries in the callchain won't be
>>> called anymore. But DOWN_FAILED/UP_CANCELED will be called for every
>>> entry.
>>> So we might even end up with a mutex_unlock(&workqueue_mutex) even if
>>> mutex_lock(&workqueue_mutex) hasn't been called...
>> This is a known problem. Gautham had sent out patches to address them
>> Looks like they are in latest mm tree. Perhaps the testcase should be
>> retried against latest mm.
> Ah, nice! Wasn't aware of that. But I still think we should have a
> Also the slab cache code hasn't been changed to make use of the of the
> new CPU_LOCK_[ACQUIRE|RELEASE] stuff. I'm going to send patches in reply
> to this mail.

2.6.20-rc3-mm1 plus your patches fixes it for me.

--Benjamin Gilbert

      parent reply	other threads:[~2007-01-09 16:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-08 17:07 Failure to release lock after CPU hot-unplug canceled Benjamin Gilbert
2007-01-09 12:17 ` Heiko Carstens
2007-01-09 12:27   ` Srivatsa Vaddagiri
2007-01-09 15:03     ` Heiko Carstens
2007-01-09 15:05       ` [patch -mm] call cpu_chain with CPU_DOWN_FAILED if CPU_DOWN_PREPARE failed Heiko Carstens
2007-01-09 15:06       ` [patch -mm] slab: use CPU_LOCK_[ACQUIRE|RELEASE] Heiko Carstens
2007-01-10 18:20         ` Christoph Lameter
2007-01-11  2:30           ` Srivatsa Vaddagiri
2007-01-09 16:34       ` Benjamin Gilbert [this message]

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