linux-kernel - Re: scheduling while atomic: swapper/0/0x10000002

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Message-ID: <20110912171625.GE2362@linux.vnet.ibm.com>
Date:	Mon, 12 Sep 2011 10:16:25 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christian Hoffmann <email@...istianhoffmann.info>
Cc:	Josh Boyer <jwboyer@...il.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: scheduling while atomic: swapper/0/0x10000002

On Mon, Sep 12, 2011 at 06:43:17PM +0200, Christian Hoffmann wrote:
> On 09/10/2011 09:58 PM, Paul E. McKenney wrote:
> >On Sat, Sep 10, 2011 at 07:17:53PM +0200, Christian Hoffmann wrote:
> >>On 09/10/2011 06:44 PM, Josh Boyer wrote:
> >>>On Sat, Sep 10, 2011 at 9:29 AM, Christian Hoffmann
> >>><email@...istianhoffmann.info>   wrote:
> >>>>Hi,
> >>>>
> >>>>I can see the following bug report in the kernel 3.1 rc5 dmesg:
> >>>>
> >>>>[    0.000008] BUG: scheduling while atomic: swapper/0/0x10000002
> >>>>[    0.000012] Modules linked in:
> >>>>[    0.000015] Pid: 0, comm: swapper Not tainted 3.1.0-rc5-ch+ #2
> >>>>[    0.000017] Call Trace:
> >>>>[    0.000024]  [<ffffffff81052cb6>] __schedule_bug+0x66/0x70
> >>>>[    0.000028]  [<ffffffff8160329d>] schedule+0x99d/0x9b0
> >>>>[    0.000032]  [<ffffffff81cf22b5>] ? pidmap_init+0x9f/0xdf
> >>>>[    0.000035]  [<ffffffff8105cc7a>] __cond_resched+0x2a/0x40
> >>>>[    0.000038]  [<ffffffff81603541>] _cond_resched+0x31/0x40
> >>>>[    0.000041]  [<ffffffff8115fb63>] kmem_cache_alloc_trace+0x53/0x160
> >>>>[    0.000043]  [<ffffffff81cf22b5>] pidmap_init+0x9f/0xdf
> >>>>[    0.000046]  [<ffffffff81cd9b8a>] start_kernel+0x333/0x3c8
> >>>>[    0.000049]  [<ffffffff81cd9347>] x86_64_start_reservations+0x132/0x136
> >>>>[    0.000051]  [<ffffffff81cd944c>] x86_64_start_kernel+0x101/0x110
> >>>
> >>>Paul McKenney has a patch that solves this oops.  You can find it here:
> >>>
> >>>http://marc.info/?l=linux-kernel&m=131537669921538&w=2
> >>>
> >>>We had discussed getting this into 3.1, but apparently that didn't
> >>>happen (yet?).  I thought it had been sent upstream with my tested-by,
> >>>but I don't see it included in Linus' tree.
> >>
> >>Hi,
> >>
> >>the patch up there doesn't seem to apply cleanly to 3.1 rc5, as it
> >>misses the rename done in "[PATCH tip/core/rcu 23/55] rcu: Simplify
> >>quiescent-state accounting"
> >>(http://marc.info/?l=linux-kernel&m=131537654621392&w=2).
> >
> >For 3.1-rc5, you will be wanting this one:
> >
> >	https://lkml.org/lkml/2011/8/19/355
> 
> Hi,
> 
> yes, this applies and makes the stack disappear.

Very good!  I have added your Tested-by, along with Josh Boyer's.

							Thanx, Paul

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