Re: WARNING: smp_call_function_single() and smp_call_function_mask()

On Sun, 02 Dec 2007 09:43:39 +0100
Tomas Carnecky <tom@xxxxxxxxxxxxx> wrote:

WARNING: at arch/x86/kernel/smp_64.c:427 smp_call_function_single()
WARNING: at arch/x86/kernel/smp_64.c:397 smp_call_function_mask()

dmesg and config attached.

I'm getting about three of each at boot. I'm running:
commit e1cca7e8d484390169777b423a7fe46c7021fec1
Date: Thu Nov 29 16:25:29 2007 -0800
which is the latest git as of yesterday plus a one (unrelated) debug
statement patch in usb uhci.

There was a similar bug report after 2.6.23-rc8-mm was released.
Though there seems to be a fundamental problem with how people use
smp_call_function*() [1]. And this can just as well be another
incarnation of it.

Is that easy enough to fix or do I need to bisect (it didn't happen in
2.6.24-rc3)?


this appears to be a bug in the acpi code, to be exact in
processor_throttling.c file, function
acpi_processor_set_throttling_ptc(); it disables interrupts and then
appears to do a cross-cpu IPI to set the state. Well... we can't do
that due to deadlock reasons (you can't do IPI's with interrupts off or
you can get a very nice deadlock with the cpu that you IPI trying to
do the same thing to you).

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