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Date: Tue, 3 Jun 2008 14:05:14 +0200 (CEST)
From: Jiri Kosina <jkosina@suse.cz>
To: Zdenek Kabelac <zdenek.kabelac@gmail.com>
cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, avi@qumranet.com
Subject: Re: BUG: using smp_processor_id() in preemptible [00000000] code:
 pm-suspend/17334
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[ re-introduced LKML to CC, and also added KVM CCs]

On Tue, 3 Jun 2008, Zdenek Kabelac wrote:

> 2008/6/3 Jiri Kosina <jkosina@suse.cz>:
> > On Tue, 3 Jun 2008, Zdenek Kabelac wrote:
> >
> >> Another backtrace from suspend code path:
> >> (T61, 2GB, C2D, no SD card)
> >> kernel from git 20080603, commit 1beee8dc8cf58e3f605bd7b34d7a39939be7d8d2
> >> ----
> >> agpgart-intel 0000:00:00.0: LATE suspend
> >> platform bay.0: LATE suspend
> >> platform dock.0: LATE suspend
> >> Extended CMOS year: 2000
> >>  hwsleep-0324 [00] enter_sleep_state     : Entering sleep state [S3]
> >> Back to C!
> >> BUG: using smp_processor_id() in preemptible [00000000] code: pm-suspend/17334
> >> caller is do_machine_check+0xa9/0x500
> >> Pid: 17334, comm: pm-suspend Not tainted 2.6.26-rc4 #31
> >> Call Trace:
> >>  [<ffffffff8118347c>] debug_smp_processor_id+0xcc/0xd0
> >>  [<ffffffff810184d9>] do_machine_check+0xa9/0x500
> >>  [<ffffffff81010e7b>] ? init_8259A+0x1b/0x120
> >>  [<ffffffff810189d6>] mce_init+0x56/0xf0
> >>  [<ffffffff81018a7b>] mce_resume+0xb/0x10
> >>  [<ffffffff81204fd0>] __sysdev_resume+0x20/0x60
> >>  [<ffffffff81205068>] sysdev_resume+0x58/0x90
> >>  [<ffffffff8120aac9>] device_power_up+0x9/0x10
> >>  [<ffffffff8106f4f7>] suspend_devices_and_enter+0x147/0x1a0
> >>  [<ffffffff8106f6c6>] enter_state+0x146/0x1d0
> >>  [<ffffffff8106f80a>] state_store+0xba/0x100
> >>  [<ffffffff81177ae7>] kobj_attr_store+0x17/0x20
> >>  [<ffffffff81110fea>] sysfs_write_file+0xca/0x140
> >>  [<ffffffff810ba00b>] vfs_write+0xcb/0x190
> >>  [<ffffffff810ba1c0>] sys_write+0x50/0x90
> >>  [<ffffffff8100c4fb>] system_call_after_swapgs+0x7b/0x80
> >
> > This looks very much like the oops you reported here:
> > http://lkml.org/lkml/2008/4/7/130
> >
> > Is this also a virtual machine run under KVM, as it has been in the
> > aforementioned thread?
> 
> 
> Ahh yes - you are right , I've completely forget about that old post -
> I've thought  that my post are usually getting fixed sooner :)
> So yes - this is actually the same bug which is still not fixed within
> the latest kernel - the machine is running qemu guest (which seems to
> me now somehow also slower)

OK, so it looks like KVM could be wrongly enabling IRQs/preemption on the 
resume path. The original bug-report is on 
http://lkml.org/lkml/2008/4/7/130

-- 
Jiri Kosina
SUSE Labs
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