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

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Date:	Fri, 14 Nov 2008 09:58:20 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: BUG: using smp_processor_id() in preemptible [00000000] code:
	latencytop/5621

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).

Best regards
-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic

View attachment "config-2.6.28-rc4" of type "text/plain" (55848 bytes)