Re: 2.6.21-rc2-mm2 hang

Dave Hansen
2007-03-07T23:07:25Z

On Wed, 2007-03-07 at 14:16 -0800, Siddha, Suresh B wrote:
> On Wed, Mar 07, 2007 at 02:12:16PM -0800, Dave Hansen wrote:
> > I'm seeing weird hangs running ltp on 2.6.21-rc2-mm2. It manifests
> > itself by the waitpid06 test in LTP hanging. This is very, very
> > reproducible in about 5 seconds by adding '-s wait' to the ltp command
> > line.
> >
> > I see 4 waitpid06 processes on my 4-way machine spinning in userspace.
> > But, the weird part is that I can't ssh in once this happens, but I can
> > log in to the console. I've bisected it down to:
> >
> > sched-fix-idle-load-balancing-in-softirqd-context
>
> This sounds like an issue in merge we recently had and 2.6.21-rc2-mm2 already
> has a fix for this.
>
> sched-fix-idle-load-balancing-in-softirqd-context-fix.patch
>
> Can you please apply both
> sched-fix-idle-load-balancing-in-softirqd-context
> sched-fix-idle-load-balancing-in-softirqd-context-fix.patch
> and see if you still see this problem?

I was confused that I couldn't find this fix in my patches directory,
but I double-checked, and realized that I was still on 2.6.21-rc2-mm1.
I must have grabbed the wrong broken-out tarball when I started the
bisect. Darn.

Anyway, 2.6.21-rc2-mm2 appears to be OK. Sorry for the false alarm.

-- Dave