On Monday, 27 August 2007 23:58, Pavel Machek wrote:
> On Mon 2007-08-27 23:59:31, Rafael J. Wysocki wrote:
> > On Monday, 27 August 2007 23:32, Pavel Machek wrote:
> > > On Mon 2007-08-27 22:36:57, Jeff Chua wrote:
> > > > On 8/27/07, Pavel Machek <[email protected]> wrote:
> > > > > On Mon 2007-08-27 12:43:50, Pavel Machek wrote:
> > > > > > Hi!
> > > > > >
> > > > > > Trying to do few onlines/offlines reliably hangs my machine (thinkpad
> > > > > > x60, i386 architecture).
> > > >
> > > > I just 3 cycles of on-line/off-line on 2.6.23-rc3 on ThinkPad x60s,
> > > > and my system still survives.
> > >
> > > Can you try 20-or-so tests? Mine hangs randomly, so it survived 4 or
> > > so cycles at one point.
> > >
> > > ...or maybe difference is in the .config, or maybe I broken something
> > > in my kernel sources....
> >
> > Well, something seems to be wrong with the CPU hotplug, but it's insanely
> > difficult to reproduce on my boxes.
> >
> > I bet on one of the notifiers blocking while waiting on a frozen task.
>
> It happens reliably for me, with this script... and randomly, when I
> just echo 0/1 > online from commandline... so it should not be
> anything with the frozen tasks.
That suggests the CPU hotplug just deadlocks internally.
Can you put some printk's into _cpu_down() and see where exactly it hangs?
> echo test > /sys/power/disk
> echo disk > /sys/power/state
>
> reliably hangs on resume in the attached script. It works ok with
> nosmp.
Which step hangs it? Or is it at random?
Rafael
> #!/bin/bash
> killall klogd
>
> echo -n "testing refrigerator (testproc)..."
> echo testproc > /sys/power/disk
> echo disk > /sys/power/state
> echo "okay"
>
> sleep 2
> echo -n "testing drivers (test)..."
> echo test > /sys/power/disk
> echo disk > /sys/power/state
> echo "okay"
>
> sleep 2
> echo -n "testing swsusp (reboot)..."
> echo reboot > /sys/power/disk
> echo disk > /sys/power/state
> echo "okay"
>
> sleep 2
> echo -n "testing s2ram..."
> s2ram
> echo "okay"
>
> sleep 2
> echo -n "testing swsusp (shutdown)..."
> echo shutdown > /sys/power/disk
> echo disk > /sys/power/state
> echo "okay"
>
> sleep 2
> echo -n "testing swsusp (platform)..."
> echo platform > /sys/power/disk
> echo disk > /sys/power/state
> echo "okay"
>
> sleep 2
> echo -n "testing s2ram..."
> s2ram
> echo "okay"
>
>
--
"Premature optimization is the root of all evil." - Donald Knuth
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