linux-kernel - Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref

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Date:	Wed, 27 Jan 2010 15:01:40 -0800
From:	Harry Edmon <harry@...os.washington.edu>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b()

J. Bruce Fields wrote:
> On Fri, Jan 22, 2010 at 03:03:25PM -0800, Andrew Morton wrote:
>   
>> (cc linux-nfs)
>>
>> On Thu, 14 Jan 2010 09:53:04 -0800
>> Harry Edmon <harry@...os.washington.edu> wrote:
>>
>>     
>>> I have a single quad-core Xeon machine running 2.6.32.2 that keeps 
>>> giving me "WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b()".  This 
>>> machine is mainaly used as a NFS server.  I have attached the kern.log 
>>> and my config file.   Any ideas?
>>>       
>
> Are you using NFSv4, or only v2/v3?  Looking at the trace:
>
> Jan 11 06:01:51 t kernel: [1311646.832173] ------------[ cut here ]------------
> Jan 11 06:01:53 t kernel: [1311646.860891] WARNING: at lib/kref.c:43 kref_get+0x23/0x2b()
>   
NFSv4 and NFSv3.
> OK, so that's the warning that we're trying to get something with
> reference count 0.
>
> Jan 11 06:01:53 t kernel: [1311646.894782] Hardware name: X7DB8
> Jan 11 06:01:53 t kernel: [1311646.915165] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative nfsd nfs lockd nfs_acl auth_rpcgss sunrpc bridge stp llc ipv6 i5000_edac edac_core i2c_i801 parport_pc parport psmouse container i2c_core ioatdma dca i5k_amb serio_raw pcspkr button processor joydev evdev xfs exportfs sg usbhid sr_mod hid cdrom ata_piix floppy uhci_hcd ehci_hcd ata_generic 3w_9xxx e1000e thermal fan raid1 md_mod sd_mod ahci libata scsi_mod [last unloaded: scsi_wait_scan]
> Jan 11 06:01:53 t kernel: [1311647.178038] Pid: 3068, comm: nfsd Tainted: G      D W  2.6.32.2 #1
>
> What does the very first oops, bug, or warning you get look like?  (If
> I'm reading the tain information right, this isn't the first one.)
>   
Attached is the kern.log that contains the first warning.

-- 
 Dr. Harry Edmon			E-MAIL: harry@...os.washington.edu
 206-543-0547 FAX: 206-543-0308		harry@...hington.edu, harry@...edu
 Director of IT, College of the Environment and
 Director of Computing, Dept of Atmospheric Sciences
 University of Washington, Box 351640, Seattle, WA 98195-1640


View attachment "kern.log.3" of type "text/plain" (25607 bytes)