Messages in this thread | | | Date | Thu, 21 Aug 2008 21:41:05 +0200 | From | "Vegard Nossum" <> | Subject | Re: latest -git: hibernate: possible circular locking dependency detected |
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On Thu, Aug 21, 2008 at 9:31 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > Now, what is the source of the "SysRq : Power Off" in the dmesg you posted?
The only suggestion I can make is that SysRq can be triggered remotely with serial console (COM1/ttyS0), because I know that the serial line is producing junk in the other direction (i.e. reading from /dev/ttyS0 on the kernel which has been booted with console=ttyS0 reads junk, sometimes things that look like pieces of dmesg). Other than that, I have no idea. The SysRq thing seems to only happen after I've entered "echo disk > /sys/power/state" too.
(Also see my email at http://lkml.org/lkml/2008/8/21/409)
> > Also, have you tried to hibernate with the "platform" setting selected in > "cat /sys/power/disk" and if you have, does the lockdep warning appear in this > case?
Yes, I have tried it. In fact, I believe the lockdep warning in the boot-log comes with such a setting (ACPI was enabled; isn't platform the default in that case?). At least it looked to be selected when acpi is enabled:
> # cat /sys/power/disk > [platform] test testproc shutdown reboot
Vegard
-- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036
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