linux-kernel - Re: nfs4 hang regression

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Message-Id: <20070905085120.bc90ffe2.akpm@linux-foundation.org>
Date:	Wed, 5 Sep 2007 08:51:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Bret Towe" <magnade@...il.com>
Cc:	linux-kernel@...r.kernel.org, Trond.Myklebust@...app.com
Subject: Re: nfs4 hang regression

> On Wed, 22 Aug 2007 15:41:18 -0700 "Bret Towe" <magnade@...il.com> wrote:

More than two weeks, you've bisected it and there's no sign of any action?

I don't see this on Michal's list so perhaps it already got fixed in a different
thread.  Have you tested current mainline?

> as of commit 3d39c691ff486142dd9aaeac12f553f4476b7a62
> I got a hang on my clients after something around 26 minutes of uptime
> the keyboard would stop accepting input
> mouse would work still, plugging in a spare usb keyboard made no difference
> another couple odd bits is shutting down would hang, below is a trace
> of that hang
> also if your logged into that machine via ssh when you log out it would hang
> and would require a force terminate
> 
> I'm seeing this on 2 machines 1 a g4 mac mini and 2 a athlon64
> both have a home directory mounted via nfs4
> reverting the commit above found via bisecting on both machines allows me
> to use the computers for several hours with no issues
> 
> and here is the trace from the athlon64 taken during its hang on shutdown
> as you can tell from the dates in the trace ive been a bit busy and just
> now got around to sending this email
> I'm surprised tho I hadn't seen anyone hitting it
> let me know what else is needed I'll do what I can and get it out quickly
> 
> Aug 12 17:06:35 ghoststar kernel: [ 4791.801262] SysRq : Show State
> Aug 12 17:06:35 ghoststar kernel: [ 4791.801325]   task
>         PC stack   pid father
> Aug 12 17:06:35 ghoststar kernel: [ 4791.801327] init          S
> 00000000ffffffff     0     1      0
> Aug 12 17:06:35 ghoststar kernel: [ 4791.801331]  ffff81003ff879b8
> 0000000000000086 0000000000000008 ffff81003ff84000

I really wish that hadn't been wordwrapped.

As a random stab-in-the-dark, does this help?

--- a/fs/nfs/nfs4renewd.c~a
+++ a/fs/nfs/nfs4renewd.c
@@ -133,9 +133,7 @@ nfs4_renewd_prepare_shutdown(struct nfs_
 void
 nfs4_kill_renewd(struct nfs_client *clp)
 {
-	down_read(&clp->cl_sem);
 	cancel_delayed_work_sync(&clp->cl_renewd);
-	up_read(&clp->cl_sem);
 }
 
 /*
_

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