Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752630AbaLDADB (ORCPT ); Wed, 3 Dec 2014 19:03:01 -0500 Received: from mail-qc0-f176.google.com ([209.85.216.176]:52120 "EHLO mail-qc0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751124AbaLDADA (ORCPT ); Wed, 3 Dec 2014 19:03:00 -0500 Message-ID: <547FA4B1.6050200@linaro.org> Date: Wed, 03 Dec 2014 19:02:57 -0500 From: David Long User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: William Cohen , Masami Hiramatsu , Steve Capper CC: "Jon Medhurst (Tixy)" , Russell King , Ananth N Mavinakayanahalli , Sandeepa Prabhu , Catalin Marinas , Will Deacon , "linux-kernel@vger.kernel.org" , Anil S Keshavamurthy , David Miller , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support References: <1416292375-29560-1-git-send-email-dave.long@linaro.org> <20141120135851.GA32528@linaro.org> <54759041.9080105@hitachi.com> <20141126100325.GA9157@linaro.org> <5476120D.9030703@linaro.org> <5476BFB4.2020705@hitachi.com> <547C36DB.7060903@hitachi.com> <547F242D.1060705@redhat.com> <547F94B0.1000902@linaro.org> In-Reply-To: <547F94B0.1000902@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/