linux-kernel - Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443 kmem_cache_destroy, scsi_put_host_cmd

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Date:	Sat, 19 Apr 2008 12:43:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Christoph Lameter <clameter@....com>
Subject: Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443
	kmem_cache_destroy, scsi_put_host_cmd_pool()


* Pekka J Enberg <penberg@...helsinki.fi> wrote:

> > [   47.370972]  [<c01b1a62>] kmem_cache_destroy+0xf8/0x102
> > [   47.377727]  [<c09dab7f>] scsi_put_host_cmd_pool+0x42/0x58
> > [   47.382973]  [<c09db1b4>] scsi_destroy_command_freelist+0x54/0x5c
> > [   47.386972]  [<c09db2ef>] scsi_host_dev_release+0x79/0xa9
> > [   47.394973]  [<c067ee95>] device_release+0x3e/0x54
> > [   47.398974]  [<c04e0e62>] kobject_release+0x45/0x55
> > [   47.405383]  [<c04e0e1d>] ? kobject_release+0x0/0x55
> > [   47.409513]  [<c04e1968>] kref_put+0x3e/0x49
> > [   47.414975]  [<c04e0d8d>] kobject_put+0x19/0x1b
> > [   47.418975]  [<c067f44e>] put_device+0x16/0x18
> > [   47.422975]  [<c09db274>] scsi_host_put+0x12/0x14
> > [   47.426975]  [<c09db3dc>] scsi_unregister+0x1d/0x20
> > [   47.433383]  [<c1ceddcc>] aha1542_detect+0x7db/0x7f5
> > [   47.438977]  [<c01698aa>] ? trace_hardirqs_on+0xb/0xd
> > [   47.442976]  [<c1ceddf1>] ? init_this_scsi_driver+0xb/0xd0
> > [   47.450666]  [<c1cede44>] init_this_scsi_driver+0x5e/0xd0
> > [   47.454978]  [<c1c944db>] kernel_init+0x152/0x2b0
> > [   47.458978]  [<c1c94389>] ? kernel_init+0x0/0x2b0
> > [   47.465249]  [<c1c94389>] ? kernel_init+0x0/0x2b0
> > [   47.469258]  [<c01199c3>] kernel_thread_helper+0x7/0x10
> > [   47.474978]  =======================
> > [   47.478980] ---[ end trace 778e504de7e3b1e3 ]---
> > [   47.483297] ------------[ cut here ]------------
> > 
> > config and bootlog at:
> > 
> >  http://redhat.com/~mingo/misc/config-Sat_Apr_19_10_28_28_CEST_2008.bad
> >  http://redhat.com/~mingo/misc/log-Sat_Apr_19_10_28_28_CEST_2008.bad
> > 
> > [a few .config options were turned off: just accept all the defaults 
> >  after 'make oldconfig']
> 
> I couldn't spot anything in particular in SLUB which makes me think 
> SCSI code simply didn't free all objects before 
> scsi_put_host_cmd_pool() called kmem_cache_destroy() to kill the 
> cache.
> 
> James, does this make sense or should I just look at SLUB harder?

yesterday's x86.git auto-qa passed fine with hundreds of successful 
builds and bootups so SLUB cannot be the culprit - i think it's more 
likely the SCSI layer changes that were pulled last night.

	Ingo
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