linux-kernel - RE: WARNING: smp_call_function_single() and smp_call_function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 3 Dec 2007 12:46:02 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Tomas Carnecky" <tom@...ervice.com>,
	"Arjan van de Ven" <arjan@...radead.org>
Cc:	<linux-kernel@...r.kernel.org>, <lenb@...nel.org>
Subject: RE: WARNING: smp_call_function_single() and smp_call_function_mask()

 

>-----Original Message-----
>From: linux-kernel-owner@...r.kernel.org 
>[mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Tomas Carnecky
>Sent: Monday, December 03, 2007 12:14 PM
>To: Arjan van de Ven
>Cc: linux-kernel@...r.kernel.org; lenb@...nel.org
>Subject: Re: WARNING: smp_call_function_single() and 
>smp_call_function_mask()
>
>Arjan van de Ven wrote:
>> On Sun, 02 Dec 2007 09:43:39 +0100
>> Tomas Carnecky <tom@...ervice.com> 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).
>> 
>
>I updated the kernel today (to 1a2edea9aff48...) and the 
>warnings are gone.

Yes. This was reported here earlier and fixed by this patch from Yakui.
http://www.ussg.iu.edu/hypermail/linux/kernel/0711.3/1596.html
which should now be merged upstream.

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