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Re: XFS hang during xfs_fsr run

To: Michael Weissenbacher <mw@xxxxxxxxxxxx>
Subject: Re: XFS hang during xfs_fsr run
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 12 Mar 2010 05:00:19 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4B9A0D2F.30506@xxxxxxxxxxxx>
References: <20100304134641.GA26871@xxxxxxxxxxxxx> <4B8FC1B7.3070505@xxxxxxxxxxxx> <20100304222611.GK14317@xxxxxxxxxxxxxxxx> <4B92C71C.5010003@xxxxxxxxxxxx> <20100308000601.GF28189@xxxxxxxxxxxxxxxx> <4B94EADD.2080108@xxxxxxxxxxxx> <4B953D3F.3090002@xxxxxxxxxxx> <4B975C5C.5090806@xxxxxxxxxxxx> <20100311233934.GB4732@dastard> <4B9A0D2F.30506@xxxxxxxxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On Fri, Mar 12, 2010 at 10:45:19AM +0100, Michael Weissenbacher wrote:
> Hi Dave!
>> Hi Michael - have you got any idea what the files are that are
>> hitting this? This failure is implying that the inode is still dirty
>> after syncing all the data. Is something trying to modify it while
>> XFS is trying to map it?
> Yes, as far as i can tell it's always a file that some process is  
> currently modifying. It happens ofter with some file unter /var/log  
> which syslog is currently modifying. I tried setting the "no-defrag"  
> flag via xfs_io's chattr on all log files but that didn't seem to help.  
> It seems that cyrus imapd is triggering this problem far more likely  
> than any other program. Some examples of files where it usually hangs:
> /var/spool/imap/x/user/xxxx/cyrus.cache (lsof -> cyrus)
> /var/imap/db/log.xxxxxxx (lsof -> cyrus)
> /var/log/xxx.log (lsof -> syslog)

So what's interesting is that cyrus uses mmapp access to files, which
might be an indicator that we have problems with excluding fsr on mmaped

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