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Date: Thu, 05 May 2011 15:08:25 +0200
From: Thomas Sattler <tsattler@....de>
To: Andrea Arcangeli <aarcange@...hat.com>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: iotop: khugepaged at 99.99% (2.6.38.3)
The machine kept running until two hours ago. Then system load
started to increase. Slowly but constantly. I waited for about
an hour before I rebooted.
It started while I was reading manpages and I could not quit
pressing 'q'. I was unable to open new terminals (in fact
the terminals opened, but never reached a shell prompt).
Already open terminals allowed entering commands, some worked
others hung. Tab completion in shells reproduceably hung them.
While I pressed SysRq-l and SysRq+t several times, nothing at
all has been written to disk. No lines in /var/log/messages
after sysload started to increase.
A terminal already running "watch -n1 'dmesg+hrts | uniq -c |
tail -n58'" showed: http://pastebin.com/raw.php?i=2cC53raT
('dmesg+hrts' translates timestamps into a wallclocktime.)
Two other terminals were running 'top' and 'iotop':
http://pastebin.com/raw.php?i=Mwj2mGdw
I tried to run 'ps xal' but that also hung the terminal. I'm
sorry, but that's all I could get. Please keep in mind that
this particular machine was (and again is), in spite of the
threads subject, running 2.6.38.2
Thomas
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