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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
