Re: scheduling while atomic: swapper/0/0x10000002

From: Paul E. McKenney
Date: Sat Sep 10 2011 - 15:58:37 EST


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@xxxxxxxxxxxxxxxxxxxxxx> 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

Thanx, Paul

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