From: Andrew Morton <akpm@osdl.org>
To: "Anders K. Pedersen" <akp@cohaesio.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.3 userspace freeze
Date: Tue, 9 Mar 2004 14:53:09 -0800 [thread overview]
Message-ID: <20040309145309.79dfac9e.akpm@osdl.org> (raw)
In-Reply-To: <1078853795.7728.27.camel@akp.cohaesio.com>
"Anders K. Pedersen" <akp@cohaesio.com> wrote:
>
> Last night I upgraded two of our webservers from Linux 2.4 to 2.6.3.
> During the night both of them rebooted spontanously (i.e. no indication
> of why in the log files) several times, so this morning I attached a
> serial console to capture the kernel messages, when they rebooted.
>
> What I found was that all of a sudden my SSH connections to the server
> and the local vtys would freeze, and it would stop responding to TCP
> connections, while still responding to ICMP echo requests. Apparently
> all userspace processes just froze. After approximately 60 seconds, it
> logged "SOFTDOG: Initiating system reboot.", and rebooted. This was the
> only kernel message, except for the boot messages. This happened
> repeatedly on both servers.
>
> Both servers run (mainly) Apache 1.3 and Sun Chili ASP (several hundred
> processes each), and the freezes seemed to happen during high load
> peaks.
>
> I have attached the kernel .config (same on both servers) and the kernel
> boot messages including the software watchdog reboot message. Both
> servers are identical IBM xSeries 345 servers. I have other similar
> servers running 2.6.3 for other purposes without any problems (so far).
>
> Any ideas on what's wrong, or how to find out, would be much
> appreciated.
It could be a kernel deadlock, or a memory leak, or a disk device driver
bug.
Would it be possible to run a `vmstat 1' somewhere and capture the last
thirty or so lines prior to the reboot?
next prev parent reply other threads:[~2004-03-09 22:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-09 17:36 2.6.3 userspace freeze Anders K. Pedersen
2004-03-09 22:53 ` Andrew Morton [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-03-10 9:12 Anders K. Pedersen
2004-03-10 13:59 ` Jan Kara
2004-03-10 15:29 Anders K. Pedersen
2004-03-10 15:44 ` Jan Kara
2004-03-11 0:45 Anders K. Pedersen
2004-03-12 8:47 Anders K. Pedersen
2004-03-12 10:08 ` Con Kolivas
2004-03-12 10:46 ` Olaf Dietsche
2004-03-12 17:20 ` Anders K. Pedersen
2004-03-12 10:44 Anders K. Pedersen
2004-03-18 15:47 Anders K. Pedersen
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