linux-kernel - Re: [REGRESSION] jump label safety checks break automatic numa balancing

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Date:	Mon, 7 Oct 2013 09:42:37 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] jump label safety checks break automatic numa
 balancing

On Fri, Oct 04, 2013 at 11:03:56AM -0400, Steven Rostedt wrote:
> 
> FYI, please remove my redhat email from your address book. I don't read
> my RH email when I travel (which I've been doing a lot lately).
> 
> 
> On Fri, 04 Oct 2013 10:44:00 -0400
> Mel Gorman <mgorman@...e.de> wrote:
> 
> > With CONFIG_NUMA_BALANCING=y and booting with numa_balancing=enable
> > there is a crash very early in the lifetime of the system. By setting
> > earlyprintk=ttyS0,115200 the error is visible and looks something like
> > this
> > 
> > [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.11.0-vanilla+ root=/dev/sda5 reboot=pci console=tty0 console=ttyS0,115200 numa_balancing=enable earlyprintk=ttyS0,115200
> > [    0.000000] Unexpected op at task_numa_fault+0x1d/0xa0 [ffffffff81085ded] (0f 1f 44 00 00) arch/x86/kernel/jump_label.c:53
> > PANIC: early exception 06 rip 10:ffffffff815b2663 error 0 cr2 ffff88107ffff000
> 
> What's at ffffffff815b2663?
> 

kernel/sched/fair.c:5901

-- 
Mel Gorman
SUSE Labs
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