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Date:	Mon, 19 Mar 2012 15:03:14 -0500 (CDT)
From:	Christoph Lameter <>
To:	Sasha Levin <>
cc:	Pablo Neira Ayuso <>,,, Dave Jones <>,,
	" List" <>,
Subject: Re: netfilter: Hung task

On Mon, 19 Mar 2012, Sasha Levin wrote:

> lockdep listed all the held locks there.

None of the locks listed are slub locks.

> I've mentioned that it looks very similar to
> where the userspace helper tried to
> read from the sysfs files, but got into a deadlock since the kernel
> side held them before it called the usermode helper.

Ah yes. In that case slub held a semaphore. Code was changed since then to
no longer hold a semaphore when calling into sysfs.

The uevent handler can execute arbitrary user space code. Do you have to
hold locks while calling kmem_cache_destroy?

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