BUG: spinlock bad magic on CPU#1, swapper/1

[Frans Pop]

Current v2.6.31-rc5-246-g90bc1a6 gives me:

BUG: spinlock bad magic on CPU#1, swapper/1
 lock: ffff88007e1889c8, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
Pid: 1, comm: swapper Not tainted 2.6.31-rc5 #4
Call Trace:
 [<ffffffff811345e8>] spin_bug+0xa2/0xaa
 [<ffffffff8113469e>] _raw_spin_lock+0x23/0x135
 [<ffffffff8125664e>] _spin_lock_bh+0x19/0x1e
 [<ffffffff811e3702>] alloc_netdev_mq+0x127/0x211
 [<ffffffff81433487>] ? netdev_init+0x6a/0xac
 [<ffffffff811a81eb>] ? loopback_setup+0x0/0x7b
 [<ffffffff8142e718>] loopback_net_init+0x30/0x7a
 [<ffffffff811dd62e>] register_pernet_device+0x2b/0x58
 [<ffffffff814336bd>] net_dev_init+0x13d/0x19b
 [<ffffffff81433580>] ? net_dev_init+0x0/0x19b
 [<ffffffff8100905c>] do_one_initcall+0x56/0x12b
 [<ffffffff8106f55b>] ? register_irq_proc+0xb0/0xcc
 [<ffffffff810e0000>] ? proc_pid_cmdline+0x5a/0xf9
 [<ffffffff8140f65d>] kernel_init+0x14d/0x1a3
 [<ffffffff8100ca7a>] child_rip+0xa/0x20
 [<ffffffff8140f510>] ? kernel_init+0x0/0x1a3
 [<ffffffff8100ca70>] ? child_rip+0x0/0x20

Error occurs during early boot (between PCI/ACPI init and PnP init).

.31-rc5 itself did not give that error.

Cheers,
FJP
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