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

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Date:	Sat, 19 Oct 2013 20:27:44 +0200
From:	Helge Deller <deller@....de>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
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 10/18/2013 10:12 PM, Myklebust, Trond wrote:
> On Fri, 2013-10-18 at 22:03 퍭��㐝�砷ꖕ�꺋�����帺�絴｟㿛䵷 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>] __schedule
>> [112009.232000]
>> [112009.232000] mount.nfs       D 00000000401040c0     0 25332  25331 0x00000010
>> [112009.232000] Backtrace:
>> [112009.232000]  [<0000000040113a68>] __schedule
> 
> 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?

sysrq-t doesn't work differently on parisc. For other processes I do get
a backtrace like the one on x86_64.
That's the main reason why I asked for ideas here on the list.
I do see the stuck process, but don't see any indications where it comes from.

Helge
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