linux-kernel - Re: 2.6.18-mm2 - oops in cache_alloc

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Message-ID: <20060930013348.GA10905@bougret.hpl.hp.com>
Date:	Fri, 29 Sep 2006 18:33:48 -0700
From:	Jean Tourrilhes <jt@....hp.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Valdis.Kletnieks@...edu,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.18-mm2 - oops in cache_alloc_refill()

On Fri, Sep 29, 2006 at 06:20:08PM -0700, Andrew Morton wrote:
> On Fri, 29 Sep 2006 20:01:54 -0400
> > 
> > Here's the traceback I got:
> > 
> > slab error in verify_redzone_free(): cache `size-32': memory outside object was overwritten
> > [<c0103ad2>] dump_trace+0x64/0x1cd
> > [<c0103c4d>] show_trace_log_lvl+0x12/0x25
> > [<c010415f>] show_trace+0xd/0x10
> > [<c01041fc>] dump_stack+0x19/0x1b
> > [<c014c796>] __slab_error+0x17/0x1c
> > [<c014cdac>] cache_free_debugcheck+0xaf/0x230
> > [<c014d43e>] kfree+0x59/0x8c
> > [<c02dc04a>] ioctl_standard_call+0x1da/0x218
> > [<c02dc275>] wireless_process_ioctl+0x55/0x312
> > [<c02d3750>] dev_ioctl+0x45f/0x49a
> > [<c02c92aa>] sock_ioctl+0x1b3/0x1c6
> > [<c0160322>] do_ioctl+0x22/0x67
> > [<c01605a5>] vfs_ioctl+0x23e/0x251
> > [<c01605ff>] sys_ioctl+0x47/0x64
> > [<c0102cd3>] syscall_call+0x7/0xb
> > DWARF2 unwinder stuck at syscall_call+0x7/0xb

	Hum... Not clear what's happening. I'll look more into it on
monday.

> > A quick strace of gkrellm finds these likely ioctl's causing the problem:
> > 
> > % grep ioctl /tmp/foo2 | sort -u | more
> > ioctl(13, SIOCGIWESSID, 0xbfbcdb9c)     = 0

	That's most likely the one. I need to check the source code.

> Yes.  The main thing which those WE-21 patches do is to shorten the size of
> various buffers which are used in wireless ioctls.

	Only for ESSID, it reduce it by one char, and remove the final
'\0'. But, kernel wise, it should not matter.

> > Since I'm using an orinoco-based card, these 2 look like the most likely
> > candidates.  WE-21 was merged between -mm1 and -mm2, which is why -mm1 was
> > stable for me.

	I'm using Orinoco, I've not seen that with iwconfig.
	I'll look into that...

	Jean


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