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Re: frequent kernel BUG and lockups - 2.6.39 + xfs_fsr

To: Marc Lehmann <schmorp@xxxxxxxxxx>
Subject: Re: frequent kernel BUG and lockups - 2.6.39 + xfs_fsr
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 10 Aug 2011 08:31:38 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20110809163525.GB22940@xxxxxxxxxx>
References: <20110806122556.GB20341@xxxxxxxxxx> <20110806142005.GG3162@dastard> <20110807014237.GA18909@xxxxxxxxxx> <20110807102625.GJ3162@dastard> <20110809091643.GA26036@xxxxxxxxxx> <20110809113536.GV3162@dastard> <20110809163525.GB22940@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Aug 09, 2011 at 06:35:25PM +0200, Marc Lehmann wrote:
> > > [248359.646330] CPU 1
> > > [248359.646326] last sysfs file: /sys/devices/virtual/net/lo/operstate
> > > [248359.646323] Oops: 0000 [#1] SMP
> > > [248359.646319] PGD 8b43067 PUD 1bc63067 PMD 0
> > > [248359.646292] IP: [<ffffffffa13371ab>] xfs_trans_log_inode+0xb/0x2f 
> > > [xfs]
> > > [248359.646285] BUG: unable to handle kernel NULL pointer dereference at 
> > > 0000000000000018
> > 
> > And the event trace to go along with the xfs-fsr run?
> 
> It wasn't enabled yet, I didn't expect it to lock up so soon, but even if,
> we would have to wait for those rare occurances where the kernel oopses
> without the box locking up (can take months).
> 
> > I don't need to know the dmesg output - I need the information in
> > the event trace from the xfs-fsr run when the problem occurs....
> 
> And I need an XFS that doesn't oops and takes the box with it to deliver
> that :)
> 
> In any case, I am confident it will happen sooner or later.
> 
> I will then not send any kernel oopses, although I had hoped that 0-ptr
> dereferences in a specific part of a function could have been a good hint.

They tell me where the crash occurred - they don't tell me the root
cause of the problem. Understanding the root cause and fixing that
is more important that putting a bandaid over the resultant panic
(which I'll probably do anyway at the same time).

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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