linux-kernel - Re: cifs causes BUG: soft lockup detected on CPU

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Date:	Thu, 29 Mar 2007 01:54:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Valentin Zaharov" <karlos_@...vision.net.il>
Cc:	<linux-kernel@...r.kernel.org>, Steven French <sfrench@...ibm.com>
Subject: Re: cifs causes BUG: soft lockup detected on CPU

On Wed, 28 Mar 2007 20:35:55 +0200 "Valentin Zaharov" <karlos_@...vision.net.il> wrote:

> Hi,
>  
> We have continous problem with server freezes. We are using cifs mounts
> on apache powered web servers with content located on Win2k3 server.
> Servers freeze from time to time, producing following error just before
> freeze:
> 
> Mar 26 21:50:37 UFR2 kernel:  CIFS VFS: cifs_strtoUCS: char2uni returned
> -22 Mar 26 21:51:45 UFR2 last message repeated 55 times Mar 26 21:52:49
> UFR2 last message repeated 30 times Mar 26 21:54:16 UFR2 last message
> repeated 10 times Mar 26 21:56:13 UFR2 last message repeated 20 times
> Mar 26 21:58:34 UFR2 last message repeated 75 times Mar 26 21:59:43 UFR2
> last message repeated 30 times Mar 26 22:01:02 UFR2 last message
> repeated 30 times Mar 26 22:02:04 UFR2 last message repeated 30 times
> Mar 26 22:03:08 UFR2 last message repeated 50 times Mar 26 22:04:27 UFR2
> last message repeated 10 times Mar 26 22:05:59 UFR2 last message
> repeated 20 times Mar 26 22:07:10 UFR2 last message repeated 20 times
> Mar 26 22:29:00 UFR2 last message repeated 64 times Mar 27 00:47:40 UFR2
> last message repeated 15 times Mar 27 01:42:41 UFR2 last message
> repeated 95 times Mar 27 02:15:57 UFR2 last message repeated 90 times
> Mar 27 02:27:13 UFR2 last message repeated 45 times Mar 27 03:14:08 UFR2
> last message repeated 95 times Mar 27 04:26:10 UFR2 last message
> repeated 2 times Mar 27 06:11:35 UFR2 last message repeated 45 times Mar
> 27 06:20:20 UFR2 last message repeated 15 times Mar 27 06:20:20 UFR2
> last message repeated 12 times Mar 27 06:27:53 UFR2 kernel: BUG: soft
> lockup detected on CPU#3!
> Mar 27 06:27:53 UFR2 kernel:  [<c0134b57>] softlockup_tick+0x9e/0xac Mar
> 27 06:27:53 UFR2 kernel:  [<c0121440>] update_process_times+0x3b/0x5e
> Mar 27 06:27:53 UFR2 kernel:  [<c010d885>]
> smp_apic_timer_interrupt+0x6c/0x7a
> Mar 27 06:27:53 UFR2 kernel:  [<c01032ec>]
> apic_timer_interrupt+0x28/0x30 Mar 27 06:27:53 UFR2 kernel:
> [<c0153d75>] generic_fillattr+0x75/0xa8 Mar 27 06:27:53 UFR2 kernel:
> [<f8e78ed2>] cifs_getattr+0x1e/0x2b [cifs] Mar 27 06:27:53 UFR2 kernel:
> [<f8e78eb4>] cifs_getattr+0x0/0x2b [cifs] Mar 27 06:27:53 UFR2 kernel:
> [<c0153dc9>] vfs_getattr+0x21/0x30 Mar 27 06:27:53 UFR2 kernel:
> [<c0153e93>] vfs_fstat+0x22/0x31 Mar 27 06:27:53 UFR2 kernel:
> [<c015443a>] sys_fstat64+0xf/0x23 Mar 27 06:27:53 UFR2 kernel:
> [<c0150fc5>] sys_open+0x1a/0x1c Mar 27 06:27:53 UFR2 kernel:
> [<c0102820>] sysenter_past_esp+0x5d/0x81 Mar 27 06:27:53 UFR2 kernel:
> [<c0310033>] xdr_xcode_array2+0x307/0x506 Mar 27 06:27:53 UFR2 kernel:

You didn't tell us what kernel version you're running.

Hanging in generic_fillattr: i_size_read() got stuck.  This is because CIFS
doesn't correctly hold i_mutex across i_size_write().

Steve, where are we up to with the fixes for that?
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