netdev - Re: Oops in tun: bisected to Limit amount of queued packets per device

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Message-Id: <200904091239.14630.borntraeger@de.ibm.com>
Date:	Thu, 9 Apr 2009 12:39:14 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: Oops in tun: bisected to  Limit amount of queued packets per device

Am Thursday 09 April 2009 11:38:17 schrieb Herbert Xu:
> On Thu, Apr 09, 2009 at 09:52:01AM +0200, Christian Borntraeger wrote:
> > with my kvm test scenario on s390 I get the following oops:
> > Unable to handle kernel pointer dereference at virtual kernel address
> > 0000000400000000 Oops: 003b [#1] SMP
> > Modules linked in: kvm dm_multipath sunrpc qeth_l2 dm_mod qeth ccwgroup
> > CPU: 0 Not tainted 2.6.29-kvm-06607-ga317a1e-dirty #8
> > Process kuli (pid: 14827, task: 00000000b3df8138, ksp: 00000000b4703a98)
> > Krnl PSW : 0404e00180000000 0000000000171278
> > (__lock_acquire+0x3d4/0x191c)
>
> This is weird.  It looks like it's dying on the wake_up_interruptible_sync
> in tun_sock_write_space.  However, I can't see how that can cause this.
>
> Were you in the middle of removing the tun module?
>
> Cheers,

No, I was booting up a guest and the guest sent its first packet (arp). I 
forgot to mention, that the tap device is persistent and attached to a 
bridge. Does that give a clue?

Christian
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