Re: 2.6.20-git15 BUG: soft lockup detected on CPU#0! - timers?

From: Michal Piotrowski
Date: Sat Feb 24 2007 - 17:46:26 EST


Hi Ingo,

On 23/02/07, Ingo Molnar <mingo@xxxxxxx> wrote:

Michal,

* Michal Piotrowski <michal.k.k.piotrowski@xxxxxxxxx> wrote:

> Here is more
>
> hardirqs last enabled at (30787): [<c0104249>] syscall_exit_work+0x11/0x26
> hardirqs last disabled at (30788): [<c0103fc9>] ret_from_exception+0x9/0xc
> softirqs last enabled at (30202): [<c01265df>] __do_softirq+0xe4/0xea
> softirqs last disabled at (30193): [<c0106a75>] do_softirq+0x64/0xd1

could you please try the patch below? This is pretty much the only
condition under which we can silently 'leak' pending softirqs, and
trigger the new warning: if something does cond_resched_softirq() in
non-runnable state. (which is a no-no, but nothing enforced this, so it
could in theory happen.) So the question is, with this patch applied, do
you get these new warnings from sched.c?

Here is a dmesg after over 25 hours of uptime
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.21-rc1/git-dmesg3
nothing new.

Regards,
Michal

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