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

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Message-ID: <AANLkTinXHoruafH6wa0NH8N+GxYTABLzGr9BiRXV2+AN@mail.gmail.com>
Date:	Mon, 21 Mar 2011 09:18:33 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.39-rc0: umount tmpfs hangs

On 21 March 2011 08:54, Al Viro <viro@...iv.linux.org.uk> wrote:
> 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...

For me it is just shutting down.
While bisecting another issue I found this range for bisection:
ceda86a108671294052cbf51660097b6534672f5 good
7a6362800cb7d1d618a697a650c7aaed3eb39320 bad

but only if the bug is 100% reproducible with my test, I can't be sure yet.
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