Strange soft lockup detected message

[lsorense@csclub.uwaterloo.ca (Lennart Sorensen)]

I have had this happen a few times recently and was wondering if anyone
has an idea what could be going on:

BUG: soft lockup detected on CPU#0!
 [<c0103fc4>] dump_stack+0x24/0x30
 [<c013d71e>] softlockup_tick+0x7e/0xc0
 [<c011eb23>] update_process_times+0x33/0x80
 [<c01062c9>] timer_interrupt+0x39/0x80
 [<c013daad>] handle_IRQ_event+0x3d/0x70
 [<c013de09>] __do_IRQ+0xa9/0x150
 [<c0104e55>] do_IRQ+0x25/0x60
 [<c010313a>] common_interrupt+0x1a/0x20
 [<d084e00c>] pcnet32_dwio_read_csr+0xc/0x20 [pcnet32]
 [<d084e9d2>] pcnet32_interrupt+0x42/0x2b0 [pcnet32]
 [<c013daad>] handle_IRQ_event+0x3d/0x70
 [<c013de09>] __do_IRQ+0xa9/0x150
 [<c0104e55>] do_IRQ+0x25/0x60
 [<c010313a>] common_interrupt+0x1a/0x20
 [<c013da88>] handle_IRQ_event+0x18/0x70
 [<c013de09>] __do_IRQ+0xa9/0x150
 [<c0104e55>] do_IRQ+0x25/0x60
 [<c010313a>] common_interrupt+0x1a/0x20
 [<00005791>] 0x5791

This is on a system running a Geode LX at 500MHz, using 2.6.18 based
kernel (specifically a slightly modified debian 4.0 Etch kernel).

I am really wondering where do I go looking for the cause of this.  The
same kernel running on a Geode SC1200 (GX1) does not appear to do this.

If I knew what the error meant I would have a better idea how to debug
it and fix it.

--
Len Sorensen
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