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Re: Tasks blocked in xlog_grant_log_space

To: Laurence Oberman <loberman@xxxxxxxxxx>
Subject: Re: Tasks blocked in xlog_grant_log_space
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Mon, 17 Feb 2014 09:28:11 +1100
Cc: xfs@xxxxxxxxxxx, Leonardo Menezes Vaz <lvaz@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <461400101.2501294.1392394773671.JavaMail.zimbra@xxxxxxxxxx>
References: <532438291.2495843.1392394364516.JavaMail.zimbra@xxxxxxxxxx> <461400101.2501294.1392394773671.JavaMail.zimbra@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Feb 14, 2014 at 11:19:33AM -0500, Laurence Oberman wrote:
> Hello
> I have a customer seeing multiple tasks blocked in xlog_grant_log_space
> This lands up hitting the hungtask timer for pdflush.
> I have seen on the list that this issue is still out there.
> I also don't see outstanding I/O requests on the XFS file system that 
> experienced this block.
> The last hung_task timeout was on dm-9 
> ffff81011c78c080 ffff81081a43bc00 xfs    /dev/vgautocomp/lv_autocomp 
> /bb/autocomp
> crash> gendisk ffff810814d24400 | grep in_flight
>   in_flight = 0, 
> So just wondering if I am hitting an existing bug or if its a new one.
> This is an older 2.6.18 kernel

There's been lots of problems fixed in this area in the past seven
years. Your best bet is to upgrade to a more recent 3.x based kernel
where the known issues in this area have been resolved.


Dave Chinner

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