Date: Sun, 17 Jun 2007 19:32:27 +0300 From: Giorgos Keramidas <keramida@freebsd.org> To: Attilio Rao <attilio@freebsd.org> Cc: current@freebsd.org Subject: Re: hard-lock with CPU spinning Message-ID: <20070617163227.GA1318@kobe.laptop> In-Reply-To: <20070614170229.GA17675@kobe.laptop> References: <20070614161632.GA3385@kobe.laptop> <3bbf2fe10706140936r4458343do95aa9f16baf2e79a@mail.gmail.com> <20070614170229.GA17675@kobe.laptop>
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On 2007-06-14 20:02, Giorgos Keramidas <keramida@ceid.upatras.gr> wrote:
>On 2007-06-14 18:36, Attilio Rao <attilio@freebsd.org> wrote:
>>2007/6/14, Giorgos Keramidas <keramida@ceid.upatras.gr>:
>>> If I leave my laptop idle for a long period of time, it tends to lock up
>>> with the CPU fan spinning fast (presumambly because some part of the
>>> kernel tries to acquire a lock and spins constantly for it).
>>>
>>> Unfortunately, this happens when X11 is running and I can't break into
>>> DDB to snoop around.
Hi Attilio,
thanks for the eagerness to help, but I was too quick in assuming this
was a hard-lock. The kernel hasn't deadlocked, but the laptop is almost
unresponsive because the X server eats up an enormous amount of CPU.
I left an xterm window running:
> cd /home/keramida
> ( while true ; do \
uptime ; ps xaur | head -20 ; \
sleep 5 ; echo ; \
done ) 2>&1 | tee logfile
and when hte CPU fan started spinning fast, I managed to shutdown
normally by pressing the laptop's power-off button and waiting long
enough for the X process to die.
The ~/logfile file contains near its end entries like:
% 6:43PM up 2:05, 1 user, load averages: 0.76, 0.39, 0.24
% USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
% root 1234 97.8 4.2 285648 21428 v1 R 4:41PM 3:22.41 X :0 -dpi 96 (Xorg)
% root 12 97.1 0.0 0 8 ?? RL 4:37PM 112:19.80 [idle: cpu0]
% root 11 2.2 0.0 0 8 ?? RL 4:37PM 110:16.80 [idle: cpu1]
%
% 6:43PM up 2:06, 1 user, load averages: 0.78, 0.40, 0.25
% USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
% root 1234 98.1 4.2 285648 21428 v1 R 4:41PM 3:27.51 X :0 -dpi 96 (Xorg)
% root 12 97.3 0.0 0 8 ?? RL 4:37PM 112:24.75 [idle: cpu0]
% root 11 1.7 0.0 0 8 ?? RL 4:37PM 110:16.83 [idle: cpu1]
%
% 6:43PM up 2:06, 1 user, load averages: 0.80, 0.41, 0.25
% USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
% root 1234 98.4 4.2 285648 21428 v1 R 4:41PM 3:32.51 X :0 -dpi 96 (Xorg)
% root 12 97.5 0.0 0 8 ?? RL 4:37PM 112:29.71 [idle: cpu0]
% root 11 1.3 0.0 0 8 ?? RL 4:37PM 110:16.84 [idle: cpu1]
Apparently, there's a bug in my xorg 7.2 installation. Please don't
spend time looking for a locking issue, until I verify that this is not
a local installation problem.
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