linux-kernel - Re: fs/dcache.c - BUG: soft lockup - CPU#5 stuck for 22s! [systemd-udevd:1667]

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Message-ID: <20140529145625.GA6263@lahna.fi.intel.com>
Date:	Thu, 29 May 2014 17:56:25 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Miklos Szeredi <mszeredi@...e.cz>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: fs/dcache.c - BUG: soft lockup - CPU#5 stuck for 22s!
 [systemd-udevd:1667]

On Thu, May 29, 2014 at 02:30:36PM +0100, Al Viro wrote:
> On Thu, May 29, 2014 at 02:04:39PM +0300, Mika Westerberg wrote:
> 
> > With your both patches applied the problem is gone :-)
> > 
> > I did 20 plug/unplugs, rebooted the machine and another 20 plug/unplugs
> > and didn't see the livelock at once.
> 
> Great...  OK, saner splitup of that sucker (equivalent to combination of
> these two patches) is in vfs.git#for-linus.
> 
> Review and testing would be very welcome.

I'll re-test that branch first thing tomorrow morning (currently at home
and the machine where this reproduces is my work desktop).
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