Re: 2.6.17-mm3

[Michal Piotrowski]

Hi,

On 27/06/06, Andrew Morton <akpm@xxxxxxxx> 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/)
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