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From: Josef Bacik <josef@redhat.com>
To: Sergei Trofimovich <slyich@gmail.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>,
	linux-btrfs@vger.kernel.org, Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH] btrfs: fix warning in iput for bad-inode
Date: Tue, 30 Aug 2011 14:02:37 -0400	[thread overview]
Message-ID: <4E5D25BD.3020901@redhat.com> (raw)
In-Reply-To: <20110830195309.4882f478@sf>

On 08/30/2011 12:53 PM, Sergei Trofimovich wrote:
>> Running 'sync' program after the load does not finish and eats 
>> 100%CPU busy-waiting for something in kernel.
>> 
>> It's easy to reproduce hang with patch for me. I just run
>> liferea and sync after it. Without patch I haven't managed to
>> hang btrfs up.
> 
> And I think it's another btrfs bug. I've managed to reproduce it 
> _without_ your patch and _without_ autodefrag enabled by manually 
> running the following commands: $ btrfs fi defrag 
> file-with-20_000-extents $ sync
> 
> I think your patch just shuffles things a bit and forces
> autodefrag races to pop-up sooner (which is good! :])
> 

Sergei, can you do sysrq+w when this is happening, and maybe turn on
the softlockup detector so we can see where sync is getting stuck?
Thanks,

Josef

  reply	other threads:[~2011-08-30 18:02 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-17 18:56 [PATCH] btrfs: fix warning in iput for bad-inode Konstantin Khlebnikov
2011-08-29  3:34 ` Sergei Trofimovich
2011-08-30 16:53   ` Sergei Trofimovich
2011-08-30 18:02     ` Josef Bacik [this message]
2011-08-30 19:31       ` Sergei Trofimovich
2011-08-30 19:40         ` Josef Bacik
2011-08-30 19:45           ` Josef Bacik
2011-08-30 20:46             ` Sergei Trofimovich
2011-08-30 21:17               ` Sergei Trofimovich
2011-09-02 17:01                 ` slyich
2011-09-07  9:18                   ` David Sterba
2011-09-01  2:45 ` David Sterba

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