linux-kernel - Re: [PATCH] cpumask: remove cpumask allocation from idle

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Message-ID: <20090319162942.GA21672@elte.hu>
Date:	Thu, 19 Mar 2009 17:29:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] cpumask: remove cpumask allocation from idle_balance


* Ingo Molnar <mingo@...e.hu> wrote:

> > This time for sure,
> 
> not so sure:
> 
> [    4.303068] =============================================================================
> [    4.303332] BUG idr_layer_cache: Redzone overwritten
> [    4.303332] -----------------------------------------------------------------------------
> [    4.303332] 
> [    4.303332] INFO: 0xffff88003f838958-0xffff88003f83895f. First byte 0xa1 instead of 0xbb
> [    4.303332] INFO: Allocated in 0xffff88003f9b94b0 age=4294878587 cpu=2 pid=0
> [    4.303332] INFO: Freed in 0xffff88003f8389f0 age=18446744073709463001 cpu=4294967295 pid=0
> [    4.303332] INFO: Slab 0xffffe200015d5340 objects=13 used=10 fp=0xffff88003f838738 flags=0x40000000000020c3
> [    4.303332] INFO: Object 0xffff88003f838738 @offset=1848 fp=0x(null)

hm, i'm seeing this even with the cpus4096 bits removed.

It _seems_ to trigger when i add these two commits:

  71ff49d: x86: with the last user gone, remove set_pte_present
  b40c757: x86/32: no need to use set_pte_present in set_pte_vaddr

but i'm not completely sure it's related, i tried a bisection and it 
showed heisenbug properties.

Might have come from upstream, that saw some IDR changes recently.

	Ingo
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