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

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Message-ID: <20090409093817.GA5760@gondor.apana.org.au>
Date:	Thu, 9 Apr 2009 17:38:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Christian Borntraeger <borntraeger@...ibm.com>
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

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,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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