linux-kernel - RE: [regression bisect -next] BUG: using smp_processor_id() in preemptible [00000000] code: rmmod

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Date:	Thu, 26 Nov 2009 18:22:41 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Leyendecker, Robert" <Robert.Leyendecker@....com>
Cc:	Eric Paris <eparis@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>, "efault@....de" <efault@....de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: RE: [regression bisect -next] BUG: using smp_processor_id() in
 preemptible [00000000] code: rmmod

On Thu, 2009-11-26 at 12:09 -0500, Leyendecker, Robert wrote:
> 
> I have same oops (different cause-vector). Details here
> http://lkml.org/lkml/2009/11/23/548

Which is an -rt kernel and very likely totally unrelated.

> Can anyone tell me if they are related and/or recommend any
> work-arounds or troubleshooting steps?
> 
> Could this be related to scheduler trying to reschedule a task/thread
> on other proc

No, the warning says you try to get the current cpu number when the code
in question is in no way tied to a particular cpu, therefore the cpu
number obtained is totally useless.

>  and possibly a false alarm? 

Most likely not.

Look at your particular source-tree and try to fine the
smp_processor_id() call that triggers this, then look what it needs the
cpu number for and fix the code so that it makes sense ;-)

> Nov 23 17:24:15 localhost kernel: BUG: using smp_processor_id() in preemptible [00000000] code: smash/3062
> Nov 23 17:24:15 localhost kernel: caller is __schedule+0x93/0x7d4
> Nov 23 17:24:15 localhost kernel: Pid: 3062, comm: smash Not tainted 2.6.31.6-rt19 #1
> Nov 23 17:24:15 localhost kernel: Call Trace:
> Nov 23 17:24:15 localhost kernel: [<c06dc3df>] ? printk+0xf/0x18
> Nov 23 17:24:15 localhost kernel: [<c05499a6>] debug_smp_processor_id+0xa6/0xbc
> Nov 23 17:24:15 localhost kernel: [<c06dc70e>] __schedule+0x93/0x7d4
> Nov 23 17:24:15 localhost kernel: [<c046621f>] ? audit_syscall_exit+0xfa/0x10f
> Nov 23 17:24:15 localhost kernel: [<c040a955>] ? syscall_trace_leave+0xc8/0xef
> Nov 23 17:24:15 localhost kernel: [<c040338a>] work_resched+0x5/0x19
> Nov 23 17:24:15 localhost kernel: __ratelimit: 6 callbacks suppressed


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