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From: Thomas Fjellstrom <thomas@fjellstrom.ca>
To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: kvm linux guest hanging for minutes at a time
Date: Sun, 7 Aug 2011 08:06:59 -0600	[thread overview]
Message-ID: <201108070806.59194.thomas@fjellstrom.ca> (raw)

Occasionally when there's heavy cpu and/or io load, a kvm guest will lock up 
for minutes at a time, last occurrence was for about 12 minutes or so, and the 
guest itself reported:

[1992982.639514] Clocksource tsc unstable (delta = -747307707123 ns)

in dmesg after it came back. The only other hint as to what is going on is 
that the irq count for "local timer requests", virtio-input and virtio-
requests spikes rather high. Also one of the cpu cores on the host was pegged  
the entire time.

The last thing to cause a hang was an "aptitude upgrade" in the guest, which 
was a bit behind, so it had to update over 300 packages.

The host is running 2.6.38-1-amd64 (2.6.38+32) from debian, qemu-kvm 0.14.0, 
and the guest was running 2.6.38-2-amd64 (not sure on the + number).

Is this a known problem, thats hopefully fixed in newer kernels and qemu/kvm 
packages?

Thanks

-- 
Thomas Fjellstrom
thomas@fjellstrom.ca

             reply	other threads:[~2011-08-07 14:13 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-07 14:06 Thomas Fjellstrom [this message]
2011-08-09  9:16 ` kvm linux guest hanging for minutes at a time Avi Kivity
2011-08-09 12:03   ` Thomas Fjellstrom
2011-08-09 12:36     ` Avi Kivity
2011-08-09 14:31       ` Thomas Fjellstrom
2011-08-09 14:37         ` Avi Kivity
2011-08-09 14:46           ` Thomas Fjellstrom
2011-08-09 14:49             ` Avi Kivity
2011-08-09 14:54               ` Thomas Fjellstrom
2011-08-09 15:01               ` Thomas Fjellstrom
2011-08-10 15:03             ` Philipp Hahn
2011-08-09 15:33           ` Nick
2011-08-11  6:38             ` Avi Kivity
2011-08-11 16:37               ` Thomas Fjellstrom

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