linux-kernel - BUG/CRASH help - 2.6.20 (fc5) - spinlock bad magic on CPU#0, kswapd

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Date:	Sun, 22 Apr 2007 13:38:13 +0100
From:	"Ian Kirk" <intercede619@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: BUG/CRASH help - 2.6.20 (fc5) - spinlock bad magic on CPU#0, kswapd

Hi,

I just wondered if the below type of crash was a known thing, and if
there are any obvious things I can do to prevent/fix it ?

BUG: spinlock bad magic on CPU#0, kswapd0/242 (Not tainted)
lock: c06c9380, .magic: c06c9380, .owner:
[<c06eba2a>] _raw_spin_lock+0x1a/0xd9
[<c061e72f>] _spin_lock_irqsave+0x9/0xd
[<c041febf>] __wake_up+0x18/0x43
[<c04379ce>] __wake_up_bit+0x2e/0x33
[<c045a496>] shrink_inactive_list+0x483/0x6c9
[<c0459eae>] shrink_active_list+0x334/0x33c
[<c045a799>] shrink_zone+0xbd/0xe2
[<c045ac0e>] kswapd+0x296/0x3bb
[<c04379e9>] autoremove_wake_function+0x0/0x35
[<c045a978>] kswapd+0x0/0x3bb
[<c043792f>] kthread+0xb0/0xd9
[<c043787f>] kthread+0x0/0xd9
[<c0404b47>] kernel_thread_helper+0x7/0x10
=======================

The .owner: field contains a long list of unprintable characters.

The server is running kernel-smp-2.6.20-1.2307.fc5.i686.rpm.
Hardware of note is:

1x AMD AM2 DUALCORE 3800
2x Corsair DDR2 XMS 1Gb PC6400
2x 400G SEAGATE SATA2 ST3400633AS (traditional s/w RAID1 w/ ext3)
1x ASUS M2V-MX AM2 MOBO (onboard NIC unused)
1x e100 driver using NIC

I've a few things to try (disabling serial/par ports, unused NIC, USB).
It also crashed with a UP kernel.

Apologies if I'm duplicating any questions asked, I Googled for the
error messages but found quite different stack traces and contextx
(e.g. resiferfs vs ext3 - i'm only running ext3)

Regards,
Ian

(normally posting from blob@...b.co.uk but can't get to that as the
server is crashed!)
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