Re: Kernel 2.6.9 Multiple Page Allocation Failures

Lukas Hejtmanek
2004-11-10T21:36:41Z

On Wed, Nov 10, 2004 at 01:09:43PM -0800, Andrew Morton wrote:
> Lukas Hejtmanek <xhejtman@mail.muni.cz> wrote:
> >
> > 2.6.10-rc1-mm3 with CONFIG_PREEMPT=y and CONFIG_PREEMPT_BKL=y
> > results with: (and many more xfs related calls)
> >
> > Nov 10 21:21:05 undomiel1 kernel: BUG: using smp_processor_id() in preemptible [00000001] code: swapper/1
> > Nov 10 21:21:05 undomiel1 kernel: caller is xfs_dir2_lookup+0x26/0x157
> > Nov 10 21:21:05 undomiel1 kernel: [<c025dbf4>] smp_processor_id+0xa8/0xb8
> > Nov 10 21:21:05 undomiel1 kernel: [<c020679b>] xfs_dir2_lookup+0x26/0x157
> > Nov 10 21:21:05 undomiel1 kernel: [<c020679b>] xfs_dir2_lookup+0x26/0x157
> > Nov 10 21:21:05 undomiel1 kernel: [<c025a4e7>] send_uevent+0x148/0x1a0
>
> That's XFS_STATS_INC() and friends.
>
> I don't think there's really a bug here. It's a tiny bit racy, but that
> will merely cause a small inaccuracy in the stats.
>
> I think I'll just drop the debug patch. You can disable
> CONFIG_DEBUG_PREEMPT to shut things up.

It did not help :( I had to disable CONFIG_PREEMPT to shut it up.

I had:
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y
CONFIG_DEBUG_PREEMPT=y

It did what I wrote.
Then I had:
CONFIG_PREEMPT=y
#CONFIG_PREEMPT_BKL=y
#CONFIG_DEBUG_PREEMPT=y

and I had the same (or similar messages)

Now I have disabled all the preempt stuff and it is ok. (but not ok with
allocation failure, see next mail)

--
Lukáš Hejtmánek