Re: [BUG?][2.6.25-mm1] sleeping during IRQ disabled

Petr Tesarik
2008-05-05T08:40:41Z

On Mon, 2008-05-05 at 00:47 +0900, KOSAKI Motohiro wrote:
> Hi Tony-san,
>
> > > > This surely is a bug. I bet this was introduced by Hidetoshi's latest
> > > > commit:
> > > >
> > > > commit 38477ad75188b2a7370fef7145f956e6c446928b
> > > > Author: Hidetoshi Seto
> > > > Date: Mon Apr 21 14:34:39 2008 -0700
> > > >
> > > > [IA64] disable interrupts on exit of ia64_trace_syscall
> > >
> > > Can you try reverting this patch and re-running the
> > > same stress tests?
> >
> > OK, I'll try it at head of next week.
>
> Hmmm,
> if I am not stupid, I think 2.6.25-mm1 doesn't contain this patch.
> I am very confusing now...

You're right, this patch is not present in -mm1. I'm sorry for the
noise.

> and, I found easy reproduce way.
> that is
>
> % pstack $$
>
> Can you reproduce it?

Thank you for isolating the test case!

I tried SUSE Factory, which is a 2.6.25 (and was readily available to
me), and I could not reproduce it. I used gstack from gdb 6.6, because I
couldn't find a true pstack for Linux. I'm now compiling -mm1 to see if
it makes any difference. I can also try on a larger machine (the testing
one is a real small Altix 350 with 2 cores).

Regards,
Petr Tesarik