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Ugly error in dmesg

To: linux-mips@linux-mips.org
Subject: Ugly error in dmesg
From: Sam Cannell <sam@catalyst.net.nz>
Date: Mon, 01 May 2006 09:47:33 +1200
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
A couple of days ago I dropped Debian on an Indy I've had lying around
for a while.  I'd done the first stage of the install, rebooted, and
left it sitting at the last half of the Debian installer for a while.
When I looked at it an hour or two later, the kernel had spat out the
following:

Eeek! page_mapcount(page) went negative! (-1)
  page->flags = 14
  page->count = 0
  page->mapping = 00000000
Break instruction in kernel code[#1]:
Cpu 0
$ 0   : 00000000 1000cc00 ffffffff 8820fe38
$ 4   : 8820fe38 8820fe54 00000001 bf0f0000
$ 8   : 00002085 88260000 0084100b 014f0000
$12   : 89187972 ffffffff 00000029 88260000
$16   : 89125460 1000d000 89125460 10034000
$20   : 89d83d30 88832100 ffffffbf 00000000
$24   : 88260000 88110960
$28   : 89d82000 89d83d08 89333200 8805b06c
Hi    : 00000000
Lo    : 00000027
epc   : 880628b8 page_remove_rmap+0xd8/0xe4     Not tainted
ra    : 8805b06c unmap_vmas+0x508/0x680
Status: 1000cc03    KERNEL EXL IE
Cause : 00000024
PrId  : 00002020
Modules linked in: unix
Process sh (pid: 7040, threadinfo=89d82000, task=8a114ad8)

[ etc .. full dmesg output is at http://plaz.net.nz/indy-dmesg.txt ]

I think the error may have appeared when the /etc/cron.daily/ scripts
started running.

I'm running a hand-compiled 2.6.16.11 (I had to drop a new kernel on
halfway through the installer because the Debian one has software raid
built as modules)

Is the message above common?  As I said, the Indy has been sitting
around doing nothing for quite a while, so the hardware may be a little
flaky.  I haven't had a chance to test the SIMMs in there, or find
others to swap in to test.

Thanks,

Sam

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