Re: Spinlock bug??

>    Hi all;
>    I'm working on a Bull - 8 way ia64 system running a
RedHat variant of
> 2.6.17.
>    I keep getting a spin lock bug and dump , attached.

Hello,

If you are running a Bull Linux kernel, I suggest that you
contact 
directly Bull for this kind of issues. We have added a few
custom patches 
that could hardly be adressed by other people from this
list.

That being said, I'm going to see what's going on in this
particular case.
You're probably right.

	Simon.



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    Simon;
    I've looked at the code and the function that calls 
cpuset_set_cpus_affinity does a get_task. That bumps the
usage count and 
should protect from an exiting process doing evil -
shouldn't it?
    So the sched_setaffinity locks, bumps the task useage
and then unlocks 
and calls cpuset_set_cpus_affinity. The in the Bull code 
cpuset_set_cpuaffinity takes a spin lock on the structure
and then 
(potentially) moves it to another CPU.
    It doesn't look like a change is required other than
removing the lock 
in cpuset_set_cpus_affinity.
    Is there a possible race here I'm missing?
    ....JW
----- Original Message ----- 
From: "Simon Derr" <Simon.Derrbull.net>
To: "JWM" <jwmsystemfabricworks.com>
Cc: <linux-ia64vger.kernel.org>; "Philippe
Garrigues" 
<philippe.garriguesbull.net>
Sent: Thursday, January 25, 2007 3:12 AM
Subject: Re: Spinlock bug??


>>    Hi all;
>>    I'm working on a Bull - 8 way ia64 system
running a RedHat variant of
>> 2.6.17.
>>    I keep getting a spin lock bug and dump ,
attached.
>
> Hello,
>
> If you are running a Bull Linux kernel, I suggest that
you contact
> directly Bull for this kind of issues. We have added a
few custom patches
> that could hardly be adressed by other people from this
list.
>
> That being said, I'm going to see what's going on in
this particular case.
> You're probably right.
>
> Simon.
>
>
>
> -
> To unsubscribe from this list: send the line
"unsubscribe linux-ia64" in
> the body of a message to majordomovger.kernel.org
> More majordomo info at  http://vge
r.kernel.org/majordomo-info.html
> 

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