linux-kernel - Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

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Date:	Tue, 12 Jul 2011 10:12:28 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	xen-devel@...ts.xensource.com,
	julie Sullivan <kernelmail.jms@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

> >   [<c042d0f5>] task_waking_fair+0x14  <--
> 
> Hmmm...  This is a 32-bit system, isn't it?

Yes. I ran this little loop:

#!/bin/bash

ID=`xl list | grep Fedora | awk '  { print $2}'`

rm -f cpu*.log
while (true) do
	xl pause $ID
	 /usr/lib64/xen/bin/xenctx -s /mnt/tmp/FC15-32/System.map-3.0.0-rc6-julie-tested-dirty -a $ID 0 >> cpu0.log
	 /usr/lib64/xen/bin/xenctx -s /mnt/tmp/FC15-32/System.map-3.0.0-rc6-julie-tested-dirty -a $ID 1 >> cpu1.log
	 /usr/lib64/xen/bin/xenctx -s /mnt/tmp/FC15-32/System.map-3.0.0-rc6-julie-tested-dirty -a $ID 2 >> cpu2.log
	 /usr/lib64/xen/bin/xenctx -s /mnt/tmp/FC15-32/System.map-3.0.0-rc6-julie-tested-dirty -a $ID 3 >> cpu3.log
	xl unpause $ID
done

To get an idea what the CPU is doing before it hits the task_waking_fair
and there isn't anything daming. Here are the logs:

http://darnok.org/xen/cpu1.log

> 
> Could you please add a check to the loop in task_waking_fair() and
> do a printk() if the loop does (say) more than 1000 passes without
> exiting?

Of course. Let me queue that up.
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