[uml-devel] 'soft lockup' issue on shutdown

[uml-devel] 'soft lockup' issue on shutdown

[Anthony Brock]

I've been encountering a "freeze" on shutdown with guest kernel
2.6.12-rc5-mm1. Today, I was busy with other things so I left it frozen for
a while. When I returned, I saw the following:

Turning off swap
BUG: soft lockup detected on CPU#0!

EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000
    Not tainted
EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000
082976f0:  [<080789a9>] show_regs+0xc9/0xf0
08297710:  [<0809bb60>] softlockup_tick+0x50/0x60
08297730:  [<08087d44>] do_timer+0x44/0x110
08297750:  [<08062750>] um_timer+0x10/0x50
08297770:  [<0809bd86>] handle_IRQ_event+0x36/0x90
082977a0:  [<0809be8e>] __do_IRQ+0xae/0x110
082977c0:  [<0805f2df>] do_IRQ+0x2f/0x40
082977d0:  [<080626cb>] timer_irq+0x11b/0x170
08297800:  [<080628d9>] timer_handler+0x49/0x60
08297820:  [<080759ca>] sig_handler_common_skas+0xaa/0x100
08297850:  [<08071b93>] alarm_handler+0x23/0x50
08297870:  [<ffffe420>] _etext+0xf7db7406/0x0
08297b80:  [<08060e2a>] default_idle+0x6a/0x80
08297bb0:  [<08064744>] init_idle_skas+0x24/0x30
08297bc0:  [<08060e4a>] cpu_idle+0xa/0x10
08297bd0:  [<0805e22f>] rest_init+0x1f/0x30
08297be0:  [<080495d6>] start_kernel+0x176/0x1b0
08297bf0:  [<0806477b>] start_kernel_proc+0x2b/0x30
08297c00:  [<08070b8a>] run_kernel_thread+0x3a/0x50
08297cd0:  [<0806448f>] new_thread_handler+0xaf/0x110
08297d20:  [<ffffe420>] _etext+0xf7db7406/0x0


Does anyone recognize this bug? I've been planning on upgrading, but would
like to know if the effort is likely to fix the issue. Unfortunately, this
is a production machine that's owned by another individual. So I need to be
careful about changes to the OS and kernel.

Tony



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Re: [uml-devel] 'soft lockup' issue on shutdown

[Jeff Dike]

On Sun, Aug 07, 2005 at 03:57:48PM -0700, Anthony Brock wrote:
> I've been encountering a "freeze" on shutdown with guest kernel
> 2.6.12-rc5-mm1. Today, I was busy with other things so I left it frozen for
> a while. When I returned, I saw the following:
> 
> Turning off swap
> BUG: soft lockup detected on CPU#0!

How reproducable is this?  I was seeing sleeps sleeping forever, often
on shutdown, but in a different place than this.

				Jeff


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Re: [uml-devel] 'soft lockup' issue on shutdown

[Anthony Brock]

Quoting Jeff Dike <jdike@addtoit.com>:
> On Sun, Aug 07, 2005 at 03:57:48PM -0700, Anthony Brock wrote:
>> I've been encountering a "freeze" on shutdown with guest kernel
>> 2.6.12-rc5-mm1. Today, I was busy with other things so I left it frozen for
>> a while. When I returned, I saw the following:
>>
>> Turning off swap
>> BUG: soft lockup detected on CPU#0!
>
> How reproducable is this?  I was seeing sleeps sleeping forever, often
> on shutdown, but in a different place than this.

This was very reproducible on this SuSE 9.1 Professional image. The
weird part is that it didn't affect the other 5 images that were running
the same kernel (different software install sets and uses, but same
installation media). So I'm not positive that it doesn't have something
to do specifically with this image.

I'll see if I can reproduce this behavior with a non-production copy of
the image. In the mean time, we've upgraded to a newer guest kernel
(2.6.12.4). However, I won't be able to reboot the production machine
again until the weekend. It does seems strange that this only happens on
shutdown/reboot, and then just after the message "Turning off swap".

Should I post the guest kernel .config file?

Tony



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Re: [uml-devel] 'soft lockup' issue on shutdown

[Blaisorblade]

On Tuesday 09 August 2005 15:47, Jeff Dike wrote:
> On Sun, Aug 07, 2005 at 03:57:48PM -0700, Anthony Brock wrote:
> > I've been encountering a "freeze" on shutdown with guest kernel
> > 2.6.12-rc5-mm1. Today, I was busy with other things so I left it frozen
> > for a while. When I returned, I saw the following:
> >
> > Turning off swap
> > BUG: soft lockup detected on CPU#0!
>
> How reproducable is this?  I was seeing sleeps sleeping forever, often
> on shutdown, but in a different place than this.
And the soft lockup you got during a kernel compile in Ottawa, in the room? 
Have you diagnosed that?
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade


	

	
		
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Re: [uml-devel] 'soft lockup' issue on shutdown

[Jeff Dike]

On Fri, Aug 12, 2005 at 03:28:59PM +0200, Blaisorblade wrote:
> And the soft lockup you got during a kernel compile in Ottawa, in the room? 
> Have you diagnosed that?

No.  I still see it very occasionally.  But it's nothing like it was before,
so I think there's something else which is happening very infrequently.

				Jeff


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