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Re: Hang in XFS reclaim on 3.7.0-rc3

To: Torsten Kaiser <just.for.lkml@xxxxxxxxxxxxxx>
Subject: Re: Hang in XFS reclaim on 3.7.0-rc3
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 19 Nov 2012 10:51:05 +1100
Cc: xfs@xxxxxxxxxxx, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <CAPVoSvSKn2FuBhMF+3U1ueuEzBqL4CFTYFGXqGczTa42PgMjRw@xxxxxxxxxxxxxx>
References: <CAPVoSvSM9=hictqwT2rzZA-fU_XSwd-_FRzW_J+HQYj7iohTWQ@xxxxxxxxxxxxxx> <20121029222613.GU29378@dastard> <CAPVoSvQATjAVu-D477mrr6K9d0FeY7sH27cH-zNBYMJcRoUY0Q@xxxxxxxxxxxxxx> <CAPVoSvRks32ZM7n6U8but-vEj622TEFqAFdxXqS_6mRxyv=0Ew@xxxxxxxxxxxxxx> <CAPVoSvSKn2FuBhMF+3U1ueuEzBqL4CFTYFGXqGczTa42PgMjRw@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sun, Nov 18, 2012 at 04:29:22PM +0100, Torsten Kaiser wrote:
> On Sun, Nov 18, 2012 at 11:24 AM, Torsten Kaiser
> <just.for.lkml@xxxxxxxxxxxxxx> wrote:
> > On Tue, Oct 30, 2012 at 9:37 PM, Torsten Kaiser
> > <just.for.lkml@xxxxxxxxxxxxxx> wrote:
> >> I will keep LOCKDEP enabled on that system, and if there really is
> >> another splat, I will report back here. But I rather doubt that this
> >> will be needed.
> >
> > After the patch, I did not see this problem again, but today I found
> > another LOCKDEP report that also looks XFS related.
> > I found it twice in the logs, and as both were slightly different, I
> > will attach both versions.
> 
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104353] 3.7.0-rc4 #1 Not tainted
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104355] inconsistent
> > {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104430]        CPU0
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104431]        ----
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104432]   
> > lock(&(&ip->i_lock)->mr_lock);
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104433]   <Interrupt>
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104434]
> > lock(&(&ip->i_lock)->mr_lock);
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104435]
> > Nov  6 21:57:09 thoregon kernel: [ 9941.104435]  *** DEADLOCK ***
> 
> Sorry! Copied the wrong report. Your fix only landed in -rc5, so my
> vanilla -rc4 did (also) report the old problem again.
> And I copy&pasted that report instead of the second appearance of the
> new problem.

Can you repost it with line wrapping turned off? The output simply
becomes unreadable when it wraps....

Yeah, I know I can put it back together, but I've got better things
to do with my time than stitch a couple of hundred lines of debug
back into a readable format....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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