Re: [s390] networking related oops during boot on Hercules (was: build failure)

From: Christian Borntraeger
Date: Wed Nov 28 2007 - 11:19:20 EST


Am Mittwoch, 28. November 2007 schrieb Frans Pop:
[...]
> During boot I get the following oops in the Hercules emulator.
> 2.6.22 runs fine on Hercules; I've not tried .23 on it.
[...]
> ------------ cut here !------------
> kernel BUG at net/core/dev.c:852 +
> illegal operation: 0001 #1!
> Modules linked in: ctc fsm tape_34xx cu3088 tape ccwgroup tape_class dm_mirror d
> m_snapshot dm_mod dasd_eckd_mod dasd_mod
> CPU: 1 Not tainted
> Process hwup (pid: 990, task: 0f034c00, ksp: 0f305be0)
> Krnl PSW : 070c0000 8019d0da (dev_alloc_name+0x1e/0x58)
> R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0
> Krnl GPRS: 00132700 00000000 0f398800 0f398800
> 00000000 80132796 0f305d7a 00000002
> 0f1ada00 0f3c1f08 0f3c1f00 0f398800
> 0f398800 8019d0c2 0f305ca0 0f305c30
> Krnl Code: 8019d0cc: f000bf1f2460 srp 3871(1,%r11),1120(%r2),0
> 8019d0d2: a7740004 brc 7,8019d0da
> 8019d0d6: a7f40001 brc 15,8019d0d8
> >8019d0da: 5810d04e l %r1,78(%r13)
> 8019d0de: 41a0f060 la %r10,96(%r15)
> 8019d0e2: 5820c460 l %r2,1120(%r12)
> 8019d0e6: 184a lr %r4,%r10
> 8019d0e8: 0de1 basr %r14,%r1
> Call Trace:
> ( <0000000000000000>! _ehead+0xfffee000/0x80)
> <000000000019d710>! register_netdev+0x34/0x6c
> <00000000108a561e>! ctc_new_device+0x3ee/0x590 ctc!
> <0000000010861398>! ccwgroup_online_store+0xb0/0x13c ccwgroup!
> <00000000000c962a>! sysfs_write_file+0xca/0x130
> <00000000000840e6>! vfs_write+0x92/0x128 +
> <00000000000847e8>! sys_write+0x40/0x70
> <000000000002098a>! sysc_do_restart+0x12/0x16
> <0000000077f0abaa>! 0x77f0abaa


This seems to be related to the new network namespace code by Eric
Biederman (CCed). Can you try the following (untested) patch? I also
CCed Ursula and Peter as they know the ctc code better than me.


CC: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
CC: Ursula Braun <braunu@xxxxxxxxxx>
CC: Peter Tiedemann <ptiedem@xxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>

---
drivers/s390/net/ctcmain.c | 2 ++
1 file changed, 2 insertions(+)

Index: linux-2.6/drivers/s390/net/ctcmain.c
===================================================================
--- linux-2.6.orig/drivers/s390/net/ctcmain.c
+++ linux-2.6/drivers/s390/net/ctcmain.c
@@ -56,6 +56,7 @@
#include <linux/skbuff.h>
#include <linux/ctype.h>
#include <net/dst.h>
+#include <net/net_namespace.h>

#include <asm/io.h>
#include <asm/ccwdev.h>
@@ -2823,6 +2824,7 @@ ctc_init_netdevice(struct net_device * d
dev->type = ARPHRD_SLIP;
dev->tx_queue_len = 100;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+ dev->nd_net = &init_net;
return dev;
}

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