Re: 2.6.17-mm3

Re: 2.6.17-mm3

[Michal Piotrowski]

Hi,

On 27/06/06, Andrew Morton <akpm@osdl.org> wrote:
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17/2.6.17-mm3/
>
>

It looks like a skge bug

=========================================================
[ INFO: possible irq lock inversion dependency detected ]
---------------------------------------------------------
swapper/0 just changed the state of lock:
 (tasklist_lock){..-?}, at: [<c0128092>] send_group_sig_info+0x16/0x34
but this lock took another, soft-irq-unsafe lock in the past:
  (&sig->stats_lock){--..}

and interrupts could create inverse lock ordering between them.


other info that might help us debug this:
no locks held by swapper/0.

the first lock's dependencies:
-> (tasklist_lock){..-?} ops: 13763 {
   initial-use  at:
                        [<c01353ab>] lock_acquire+0x60/0x80
                        [<c02d0ce2>] _write_lock_irq+0x29/0x38
                        [<c011c4e3>] copy_process+0xea7/0x13c0
                        [<c011cc6a>] do_fork+0x8d/0x18f
                        [<c010136c>] kernel_thread+0x6c/0x74
                        [<c0100518>] rest_init+0x14/0x3c
                        [<c03b6769>] start_kernel+0x388/0x390
                        [<c0100210>] 0xc0100210
   in-softirq-R at:
[..]

Here is a dmesg log http://www.stardust.webpages.pl/files/mm/2.6.17-mm3/mm-dmesg

Here is a config file
http://www.stardust.webpages.pl/files/mm/2.6.17-mm3/mm-config

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)

Re: 2.6.17-mm3

[Stephen Hemminger]

On Tue, 27 Jun 2006 16:12:42 +0200
"Michal Piotrowski" <michal.k.k.piotrowski@gmail.com> wrote:

> Hi,
> 
> On 27/06/06, Andrew Morton <akpm@osdl.org> wrote:
> >
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17/2.6.17-mm3/
> >
> >
> 
> It looks like a skge bug
> 
> =========================================================
> [ INFO: possible irq lock inversion dependency detected ]
> ---------------------------------------------------------
> swapper/0 just changed the state of lock:
>  (tasklist_lock){..-?}, at: [<c0128092>] send_group_sig_info+0x16/0x34
> but this lock took another, soft-irq-unsafe lock in the past:
>   (&sig->stats_lock){--..}
> 
> and interrupts could create inverse lock ordering between them.
> 
> 
> other info that might help us debug this:
> no locks held by swapper/0.
> 
> the first lock's dependencies:
> -> (tasklist_lock){..-?} ops: 13763 {
>    initial-use  at:
>                         [<c01353ab>] lock_acquire+0x60/0x80
>                         [<c02d0ce2>] _write_lock_irq+0x29/0x38
>                         [<c011c4e3>] copy_process+0xea7/0x13c0
>                         [<c011cc6a>] do_fork+0x8d/0x18f
>                         [<c010136c>] kernel_thread+0x6c/0x74
>                         [<c0100518>] rest_init+0x14/0x3c
>                         [<c03b6769>] start_kernel+0x388/0x390
>                         [<c0100210>] 0xc0100210
>    in-softirq-R at:
> [..]
> 
> Here is a dmesg log http://www.stardust.webpages.pl/files/mm/2.6.17-mm3/mm-dmesg


That file no longer exists...

> Here is a config file
> http://www.stardust.webpages.pl/files/mm/2.6.17-mm3/mm-config
> 
> Regards,
> Michal
> 


-- 
If one would give me six lines written by the hand of the most honest
man, I would find something in them to have him hanged. -- Cardinal Richlieu

Re: 2.6.17-mm3

[Michal Piotrowski]

Stephen Hemminger napisał(a):
> On Tue, 27 Jun 2006 16:12:42 +0200
> "Michal Piotrowski" <michal.k.k.piotrowski@gmail.com> wrote:
> 
>> Hi,
>>
>> On 27/06/06, Andrew Morton <akpm@osdl.org> wrote:
>>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17/2.6.17-mm3/
>>>
>>>
>> It looks like a skge bug
>>
>> =========================================================
>> [ INFO: possible irq lock inversion dependency detected ]
>> ---------------------------------------------------------
>> swapper/0 just changed the state of lock:
>>  (tasklist_lock){..-?}, at: [<c0128092>] send_group_sig_info+0x16/0x34
>> but this lock took another, soft-irq-unsafe lock in the past:
>>   (&sig->stats_lock){--..}
>>
>> and interrupts could create inverse lock ordering between them.
>>
>>
>> other info that might help us debug this:
>> no locks held by swapper/0.
>>
>> the first lock's dependencies:
>> -> (tasklist_lock){..-?} ops: 13763 {
>>    initial-use  at:
>>                         [<c01353ab>] lock_acquire+0x60/0x80
>>                         [<c02d0ce2>] _write_lock_irq+0x29/0x38
>>                         [<c011c4e3>] copy_process+0xea7/0x13c0
>>                         [<c011cc6a>] do_fork+0x8d/0x18f
>>                         [<c010136c>] kernel_thread+0x6c/0x74
>>                         [<c0100518>] rest_init+0x14/0x3c
>>                         [<c03b6769>] start_kernel+0x388/0x390
>>                         [<c0100210>] 0xc0100210
>>    in-softirq-R at:
>> [..]
>>
>> Here is a dmesg log http://www.stardust.webpages.pl/files/mm/2.6.17-mm3/mm-dmesg
> 
> 
> That file no longer exists...

It was moved, sorry.

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)

Re: 2.6.17-mm3

[Herbert Xu]

Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
> 
> It was moved, sorry.

I fail to spot any relevant backtraces for skge or indeed any part
of the networking stack.  Ingo/Arjan, perhaps you guys can figure
out what's wrong here.

In future perhaps you should consider posting the dmesg to the list
directly.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt