linux-kernel - Re: [2.6.23] tasks stuck in running state?

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Date:	Fri, 19 Oct 2007 18:08:20 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Jeff Garzik" <jeff@...zik.org>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.23] tasks stuck in running state?

On 10/19/07, Jeff Garzik <jeff@...zik.org> wrote:
> On my main devel box, vanilla 2.6.23 on x86-64/Fedora-7, I'm seeing a
> certain behavior at least once a day.  I'll start a kernel build (make
> -sj5 on this box), and it will "hang" in the following way:
>
> > 31003 ?        S      0:04 sshd: jgarzik@.../0
> > 31004 pts/0    Ss     0:02  \_ -bash
> >  8280 pts/0    S+     0:00      \_ make ARCH=i386 -sj4
> >  8690 pts/0    Z+     0:00          \_ [rm] <defunct>
> >  8691 pts/0    S+     0:00          \_ /bin/sh -c cat include/config/kernel.release 2> /dev/null
> >  8692 pts/0    R+     6:12              \_ cat include/config/kernel.release
>
> Specifically, the symptom is a process, often a simple one like cat(1)
> or rm(1) or somewhere in check-headers, will stay in the running state,
> accumulating CPU time.
>
> If I Ctrl-C the build, and start over, the build will normally -not- get
> stuck at the same point, but proceed to chew through one of a bazillion
> allmodconfig builds.

I *think* I'm seeing this with firefox under 2.6.23-rc6. I tried a
`killall -SIGSTOP firefox; killall -SIGCONT firefox` and when I looked
back it was back to life again, but that may have been a fluke.
Regardless, try that the next time it happens?

Ray
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