linux-kernel - Re: 2.6.39-rc0: umount tmpfs hangs

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Message-ID: <20110321055413.GT22723@ZenIV.linux.org.uk>
Date:	Mon, 21 Mar 2011 05:54:13 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Alexander Beregalov <a.beregalov@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.39-rc0: umount tmpfs hangs

On Mon, Mar 21, 2011 at 08:30:23AM +0300, Alexander Beregalov wrote:

> > rcu_barrier() hanging for some reason... ??I really wonder what's going
> > on there - missing rcu_read_unlock()? ??Could you try to reproduce that
> > sucker and, if possible, bisect it?
> 
> Yes, it's reproducible, but I'm bisecting another issue and have few
> more such issues with the current kernel.

Could you post the reproducer?  Simple mounting tmpfs and umount explicitly
doesn't seem to trigger it; doing some IO on that fs doesn't change that,
ditto for umount done by shutdown instead of doing it manually...
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