linux-kernel - Re: [x86] 5ac0c41bf3: WARNING: CPU: 0 PID: 0 at arch/x86/mm/extable.c:50 ex_handler_rdmsr

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Date:	Wed, 15 Jun 2016 11:12:37 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, wfg@...ux.intel.com,
	LKP <lkp@...org>, lkml <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [x86] 5ac0c41bf3: WARNING: CPU: 0 PID: 0 at arch/x86/mm/extable.c:50
 ex_handler_rdmsr_unsafe

On Wed, Jun 15, 2016 at 11:07 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Wed, Jun 15, 2016 at 10:55:34AM -0700, Andy Lutomirski wrote:
>> Isn't it this one?
>
> Yes, it is.
>
>> I'm not.  If %pF points at some silly helper, we still want the frames below it.
>
> Why silly helper? It points to the rIP where the *MSR instruction is.
> Can't get more precise than that.

A hypothetical helper.

void do_thing(unsigned long msr)
{
  rdmsr(...);
}

void actual_problem(void)
{
  do_thing(0xbaadc0de);
}

I want to see actual_problem in the log.

--Andy