netdev - Boot lockups triggered by 'net: restore the original spinlock to protect unicast list'

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Message-ID: <20090805133659.GA3740@rakim.wolfsonmicro.main>
Date:	Wed, 5 Aug 2009 14:36:59 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Jiri Pirko <jpirko@...hat.com>, Meelis Roos <mroos@...ux.ee>,
	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Boot lockups triggered by 'net: restore the original spinlock to
 protect unicast list'

I'm experiencing lockups at boot in -next with the loopback interface on
my SMDK6410.  These appear to be triggered by commit
a6ac65db2329e7685299666f5f7b6093c7b0f3a0 (net: restore the original
spinlock to protect unicast list) - the code change is suspicious and
reverting the change allows my system to boot.  I've not yet tried to
understand the failure, I'm just reporting it.

The console trace I get on failure is:

[    1.830000] BUG: spinlock bad magic on CPU#0, swapper/1                      
[    1.830000]  lock: c7852508, .magic: 00000000, .owner: <none>/-1, .owner_cpu0
[    1.840000] [<c002fdc8>] (unwind_backtrace+0x0/0xe0) from [<c01679fc>] (_raw)
[    1.850000] [<c01679fc>] (_raw_spin_lock+0x20/0x98) from [<c020ac40>] (dev_u)
[    1.860000] [<c020ac40>] (dev_unicast_init+0x18/0x3c) from [<c020ebf8>] (all)
[    1.860000] [<c020ebf8>] (alloc_netdev_mq+0xbc/0x13c) from [<c001b210>] (loo)
[    1.870000] [<c001b210>] (loopback_net_init+0x1c/0x70) from [<c02096e4>] (re)
[    1.880000] [<c02096e4>] (register_pernet_operations+0x20/0x2c) from [<c0209)
[    1.890000] [<c0209778>] (register_pernet_device+0x20/0x54) from [<c001cbbc>)
[    1.900000] [<c001cbbc>] (net_dev_init+0xd0/0x15c) from [<c0029274>] (do_one)
[    1.910000] [<c0029274>] (do_one_initcall+0x4c/0x174) from [<c0008640>] (do_)
[    1.920000] [<c0008640>] (do_initcalls+0x1c/0x38) from [<c0008a04>] (kernel_)
[    1.930000] [<c0008a04>] (kernel_init+0x3c/0x8c) from [<c002ac98>] (kernel_t)
[    9.930000] BUG: spinlock lockup on CPU#0, swapper/1, c7852508               
[    9.930000] [<c002fdc8>] (unwind_backtrace+0x0/0xe0) from [<c01679c8>] (__sp)
[    9.940000] [<c01679c8>] (__spin_lock_debug+0x88/0x9c) from [<c0167a54>] (_r)
[    9.940000] [<c0167a54>] (_raw_spin_lock+0x78/0x98) from [<c020ac40>] (dev_u)
[    9.950000] [<c020ac40>] (dev_unicast_init+0x18/0x3c) from [<c020ebf8>] (all)
[    9.960000] [<c020ebf8>] (alloc_netdev_mq+0xbc/0x13c) from [<c001b210>] (loo)
[    9.970000] [<c001b210>] (loopback_net_init+0x1c/0x70) from [<c02096e4>] (re)
[    9.980000] [<c02096e4>] (register_pernet_operations+0x20/0x2c) from [<c0209)
[    9.990000] [<c0209778>] (register_pernet_device+0x20/0x54) from [<c001cbbc>)
[   10.000000] [<c001cbbc>] (net_dev_init+0xd0/0x15c) from [<c0029274>] (do_one)
[   10.010000] [<c0029274>] (do_one_initcall+0x4c/0x174) from [<c0008640>] (do_)
[   10.020000] [<c0008640>] (do_initcalls+0x1c/0x38) from [<c0008a04>] (kernel_)
[   10.030000] [<c0008a04>] (kernel_init+0x3c/0x8c) from [<c002ac98>] (kernel_t)
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