Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs

From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Don Zickus <dzickus@redhat.com>
Cc: Robert Richter <robert.richter@amd.com>,
	Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <peterz@infradead.org>,
	Lin Ming <ming.m.lin@intel.com>,
	"fweisbec@gmail.com" <fweisbec@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Huang, Ying" <ying.huang@intel.com>,
	Yinghai Lu <yinghai@kernel.org>, Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs
Date: Tue, 24 Aug 2010 23:52:40 +0400	[thread overview]
Message-ID: <20100824195240.GA5281@lenovo> (raw)
In-Reply-To: <20100824185458.GG5723@lenovo>

On Tue, Aug 24, 2010 at 10:54:58PM +0400, Cyrill Gorcunov wrote:
...
> > > | commit 4a31bebe71ab2e4f6ecd6e5f9f2ac9f0ff38ff76
> > > | Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
> > > | Date:   Thu Aug 19 16:28:00 2010 +0200
> > > |
> > > |    perf, x86: Fix handle_irq return values
> > 
> > Has anyone else seen kernel panics when enabling the LOCKUP_DETECTOR or
> > apply Robert's patch?  I keep getting a panic with unable to handle paging
> > request everytime either Robert's patch or the lockup detector uses
> > __get_cpu_var().  And only on 2.6.36 code.
> > 
> > Cheers,
> > Don
> > 
> 
> I use 2.6.34 atm. Letme try 2.6.36 (which might require some time to recompile).
> 
> 	-- Cyrill

Don, for me it fails with somehow unrelated page handling fault - in
reiserfs_evict_inode O_o Fails in __get_cpu_var I suspect might means
a problem either in per-cpu allocator itself or we screw pointer somehow.
Weird.

	-- Cyrill