linux-kernel - Re: 2.6.{26.2,27-rc} oops on virtualbox

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Message-ID: <20080822142054.403cbdef@doriath.conectiva>
Date:	Fri, 22 Aug 2008 14:20:54 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.{26.2,27-rc} oops on virtualbox

Em Fri, 22 Aug 2008 12:35:20 -0400
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> escreveu:

| * Luiz Fernando N. Capitulino (lcapitulino@...driva.com.br) wrote:
| > Em Fri, 22 Aug 2008 11:34:52 -0400
| > Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> escreveu:
| > 
| > | * Luiz Fernando N. Capitulino (lcapitulino@...driva.com.br) wrote:
| > | > Em Fri, 22 Aug 2008 08:50:12 +0200
| > | > Ingo Molnar <mingo@...e.hu> escreveu:
| > | > 
| > | > | 
| > | > | * H. Peter Anvin <hpa@...or.com> wrote:
| > | > | 
| > | > | > H. Peter Anvin wrote:
| > | > | >>>
| > | > | >>>  Does this look like a kernel bug?
| > | > | >>>
| > | > | >>
| > | > | >> No, it looks like a very common virtualizer bug.  Does the attached  
| > | > | >> patch work for you?
| > | > | >>
| > | > | >
| > | > | > Also, in addition to this, please try tip:master.  There is a patch in 
| > | > | > tip:master which I hope should fix this problem, but the details are 
| > | > | > important.
| > | > | 
| > | > | access coordinates would be at:
| > | > | 
| > | > |   http://people.redhat.com/mingo/tip.git/README
| > | > 
| > | >  As I already have Linus tree downloaded I have cloned it in
| > | > the usual way.
| > | > 
| > | >  Got the same results: OOPS in virtualbox but it works on QEMU.
| > | > 
| > | >  The OOPS's output follows and I have attached the .config I'm using
| > | > to reproduce the problem.
| > | > 
| > | 
| > | Can you try booting with the kernel argument :
| > |   debug_alternative 
| > | 
| > | The dmesg of the kernel bootup up to the oops would be helpful.
| > | 
| > | My guess is that there may be something wrong with irq disabling which
| > | protects text_poke_early in apply_alternatives().
| > 
| >  I have attached two files:
| > 
| >   - normal.txt: normal boot with no debug options
| >   - debug-alternative.txt ignore_loglevel and debug-alternative boot
| >     options
| > 
| >  I had to pass ignore_loglevel otherwise it wouldn't print
| > anything.
| > 
| 
| Ok, now can you try booting with either of those args :
| 
| noreplace-paravirt
| noreplace-smp
| 
| And see which one(s) works ?

 noreplace-paravirt works, the other one causes no change.

 You will find the full boot log (with debug-alternative enabled)
attached.

-- 
Luiz Fernando N. Capitulino

View attachment "working.txt" of type "text/plain" (8311 bytes)