linux-kernel - Re: BUG: using smp_processor_id() in preemptible [00000000] code: latencytop/5621

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Date:	Tue, 18 Nov 2008 22:24:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code:
	latencytop/5621


* Michal Hocko <mhocko@...e.cz> wrote:

> On Sun 16-11-08 00:28:12, Rafael J. Wysocki wrote:
> > On Friday, 14 of November 2008, Michal Hocko wrote:
> > > Hi Ingo,
> > > I am experiencing %subj whenever I run latencytop with the rc4 kernel. I
> > > have bisected down to the patch 7cbaef9c83e58bbd4bdd534b09052b6c5ec457d5
> > > I am not sure whether this is the same problem as the one reported by
> > > Maciej Rutecki (http://lkml.org/lkml/2008/11/12/266), but I have tried
> > > your patch (http://lkml.org/lkml/2008/11/12/295) and the problem is
> > > still there:
> > > BUG: using smp_processor_id() in preemptible [00000000] code:
> > > latencytop/5621
> > > caller is native_sched_clock+0x47/0x65
> > > Pid: 5621, comm: latencytop Not tainted 2.6.28-rc4 #13
> > > Call Trace:
> > >  [<c03f17c0>] ? printk+0xf/0x11
> > >  [<c022ad36>] debug_smp_processor_id+0xa2/0xb8
> > >  [<c01080d4>] native_sched_clock+0x47/0x65
> > >  [<c01259a9>] proc_sched_show_task+0xd72/0xdd0
> > >  [<c01a73c4>] sched_show+0x39/0x55
> > >  [<c018cc43>] seq_read+0xee/0x29a
> > >  [<c018cb55>] ? seq_read+0x0/0x29a
> > >  [<c017a04c>] vfs_read+0x87/0x12b
> > >  [<c017a189>] sys_read+0x3b/0x60
> > >  [<c0103a59>] sysenter_do_call+0x12/0x25
> > >  [<c03f0000>] ? cpu_callback+0x238/0x25b
> > > 
> > > I receive flood if this messages immediately after latencytop starts.
> > > Reverting 7cbaef9c83e58bbd4bdd534b09052b6c5ec457d5 solves the problem.
> > > Config is attached.
> > > 
> > > Let me know if you need some more testing (however I will afk until
> > > Tuesday).
> > 
> > Please retest with 2.6.28-rc5.
> 
> Still problem with rc5 (4e14e833ac3b97a4aa8803eea49f899adc5bb5f4).
> Ingo's patch from http://lkml.org/lkml/2008/11/16/26 fixes this problem

that's upstream now as of v2.6.28-rc5-117-g7f0f598 and later kernels, 
via this commit:

29d7b90: sched: fix kernel warning on /proc/sched_debug access

	Ingo
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