linux-kernel - Re: 3.15-rc5 soft-lockup in dentry

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Message-ID: <20140512154230.GD18016@ZenIV.linux.org.uk>
Date:	Mon, 12 May 2014 16:42:30 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Miklos Szeredi <mszeredi@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: 3.15-rc5 soft-lockup in dentry_kill

On Mon, May 12, 2014 at 09:21:53AM -0400, Josh Boyer wrote:
> Hi All,
> 
> We got a report[1] of udevd hanging up in a soft lockup with 3.15-rc5
> over the weekend.  The backtrace is below.  I know there were a number
> of recent changes here, so hopefully this triggers someone's memory.

Reproducer would be nice...  Incidentally, kernfs ->d_revalidate() looks
like a massive source of contention - it grabs a system-wide mutex all
the time, and I'd like to see profiles on the loads that go anywhere near
that sucker.
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