linux-kernel - Re: 2.6.22-rc1-mm1 cifs

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Message-Id: <20070522202133.552d1a94.akpm@linux-foundation.org>
Date:	Tue, 22 May 2007 20:21:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"young dave" <hidave.darkstar@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Steven French" <sfrench@...ibm.com>
Subject: Re: 2.6.22-rc1-mm1 cifs_mount oops

On Wed, 23 May 2007 02:59:07 +0000 "young dave" <hidave.darkstar@...il.com> wrote:

> Hi,
> maybe we can add if sentence before kthread_stop.
> 
> diff -ur linux/fs/cifs/connect.c linux.new/fs/cifs/connect.c
> --- linux/fs/cifs/connect.c     2007-05-23 10:59:13.000000000 +0000
> +++ linux.new/fs/cifs/connect.c 2007-05-23 10:58:39.000000000 +0000
> @@ -2070,7 +2070,8 @@
>                         spin_unlock(&GlobalMid_Lock);
>                         if (srvTcp->tsk) {
>                                 send_sig(SIGKILL,srvTcp->tsk,1);
> -                               kthread_stop(srvTcp->tsk);
> +                               if(srvTcp->tsk)
> +                                       kthread_stop(srvTcp->tsk);
>                         }
>                 }

Yeah, that's racy: once we've sent the signal, the kernel thread can write
NULL to srvTcp->tsk at any time.

-
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