linux-kernel - Re: __schedule #DF splat

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Date:	Fri, 27 Jun 2014 14:01:43 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org>,
	kvm@...r.kernel.org, Jörg Rödel <joro@...tes.org>
Subject: Re: __schedule #DF splat

Il 27/06/2014 13:55, Borislav Petkov ha scritto:
> On Fri, Jun 27, 2014 at 01:41:30PM +0200, Paolo Bonzini wrote:
>> Il 27/06/2014 12:18, Borislav Petkov ha scritto:
>>> Joerg says I should bisect but I'm busy with other stuff. If people are
>>> interested in chasing this further, I could free up some time to do
>>> so...
>>
>> Please first try "-M pc-1.7" on the 2.0 QEMU.  If it fails, please do bisect
>> it.  A QEMU bisection between one release only usually takes only half an
>> hour or so for me.
>>
>> I use
>>
>> ../configure --target-list=x86_64-softmmu && make distclean &&
>> ../configure --target-list=x86_64-softmmu &&
>> make -j8 subdir-x86_64-softmmu
>>
>> Until it's below 50 commits.  After that point just "make -j8
>> subdir-x86_64-softmmu" should do.  This ensures that build system changes do
>> not bite you as you move back and forth in time.
>
> Ok, thanks for the help.
>
> However, as it always happens, right after sending the mail, I triggered
> it with the qemu installed on the system too :-( I.e., qemu 1.7.1.

:)

Can you try gathering a trace? (and since those things get huge, you can 
send it to me offlist)  Also try without ept and see what happens.

Also, perhaps you can bisect between Linus's tree and tip?

And finally, what is the host kernel?

Paolo

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