linux-kernel - Re: 3.12-rcX - NFS regression - kswapd0 / kswapd1 stays using 100% CPU?

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Message-ID: <1382127133.20461.9.camel@leira.trondhjem.org>
Date:	Fri, 18 Oct 2013 20:12:14 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Helge Deller <deller@....de>
CC:	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	NFS list <linux-nfs@...r.kernel.org>,
	linux-parisc <linux-parisc@...r.kernel.org>
Subject: Re: 3.12-rcX - NFS regression - kswapd0 / kswapd1 stays using 100%
 CPU?

On Fri, 2013-10-18 at 22:03 +0200, Helge Deller wrote:
> On 10/18/2013 09:36 PM, Myklebust, Trond wrote:
> > Also, could you please try a sysRQ-t the next time it happens, so that
> > we can get a trace of where the mount program is hanging. Knowing that
> > the mount is stuck in "__schedule()" is not really interesting unless we
> > know from where that was called.
> 
> Actually, the machine was still running in this state.
> Here is sysrq-t:
> [112009.084000] mount           S 00000000401040c0     0 25331      1 0x00000010
> [112009.084000] Backtrace:
> [112009.084000]  [<0000000040113a68>] __schedule팞瓓ﴱ
> [112009.232000]
> [112009.232000] mount.nfs       D 00000000401040c0     0 25332  25331 0x00000010
> [112009.232000] Backtrace:
> [112009.232000]  [<0000000040113a68>] __schedule팞瓓ﴱ

That makes no sense unless sysrq-t works differently on parisc than on
other platforms. I'd expect the backtrace to at least include a system
call. Parisc experts?

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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