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Re: Occassional problems with unfreeze

To: Hrishikesh Barua <talonx@xxxxxxxxx>
Subject: Re: Occassional problems with unfreeze
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 25 Sep 2014 17:18:52 +1000
Cc: Brian Foster <bfoster@xxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <CAD2VtSgdYt2zxmEeWEXmK2B44BKuB-wRKvX4H=jRA9Rj7pyamA@xxxxxxxxxxxxxx>
References: <CAD2VtSjwu3eB+mrs2vX0G4+MJbHyNGVXvVR+P_ssNY6rydvijA@xxxxxxxxxxxxxx> <20140716124757.GC36312@xxxxxxxxxxxxxxx> <CAD2VtShVThd0j0-YgGE6fAe28DJ1U-CCRR3Sj9eNjTLKp7FygA@xxxxxxxxxxxxxx> <CAD2VtSgdYt2zxmEeWEXmK2B44BKuB-wRKvX4H=jRA9Rj7pyamA@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Sep 25, 2014 at 11:37:47AM +0530, Hrishikesh Barua wrote:
> This happened again yesterday and I took the "echo w >
> /proc/sysrq-trigger".
> Output - http://pastebin.com/rpKNSYY7

How long have you been ignoring these messages for?

[30278027.798067] XFS (xvdj): xlog_space_left: head behind tail
[30278027.798069]   tail_cycle = 1085, tail_bytes = 1041920
[30278027.798070]   GH   cycle = 1085, GH   bytes = 1039296

XFS is emitting that warning several times a second. Isn't that a
pretty good sign that there's something not quite right and is worth
reporting?

Indeed, you are running an old kern (3.2.0-54) which means it won't
have this fix:

3948659 xfs: Account log unmount transaction correctly

And that's likely to be the source of all your freeze/unfreeze
problems because it will eventually hang the log when it's leaked
all it's space in the ether....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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