linux-kernel - Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support

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Date:	Wed, 03 Dec 2014 19:02:57 -0500
From:	David Long <dave.long@...aro.org>
To:	William Cohen <wcohen@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steve Capper <steve.capper@...aro.org>
CC:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	David Miller <davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support

On 12/03/14 17:54, David Long wrote:
> On 12/03/14 09:54, William Cohen wrote:
>> On 12/01/2014 04:37 AM, Masami Hiramatsu wrote:
>>> (2014/11/29 1:01), Steve Capper wrote:

[...]

>>>> That would explain why the state of play of the interrupts is in an
>>>> unexpected state in the crash I reported:
>>>> "The point of failure in the panic was:
>>>> fs/buffer.c:1257
>>>>
>>>> static inline void check_irqs_on(void)
>>>> {
>>>> #ifdef irqs_disabled
>>>>          BUG_ON(irqs_disabled());
>>>> #endif
>>>> }
>>>> "
>>>>
>>>> This is all new to me so I'm still at the head-scratching stage.
>>>
>>> Ah, I see.
>>>
>>> Thank you,
>>>
>>>>
>>>> David,
>>>> Does the above make sense to you? Have you managed to reproduce the
>>>> crash I get?
>>>>
>>>> Cheers,
>>>> --
>>>> Steve
>
> I have easily produced a crash although it doesn't look to me like the
> same one.  I'm getting a NULL pointer dereference.  The PMU stuff (used
> by perf record|stat -e) should be quite independent of kprobes though.
>
> -dl
>

Oops, never mind the above bit.  I see this is not PMU-related, but use 
of kprobes through perf.  My bad.

-dl

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