linux-kernel - Re: Regression in linux-next

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Message-ID: <9923015d-ea50-27d1-1a38-f661f05dd09f@intel.com>
Date:   Mon, 16 Oct 2017 16:10:07 +0300
From:   Petri Latvala <petri.latvala@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Yu Chen <yu.c.chen@...el.com>, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Tony Luck <tony.luck@...el.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Alok Kataria <akataria@...are.com>,
        Joerg Roedel <joro@...tes.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Christoph Hellwig <hch@....de>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Rui Zhang <rui.zhang@...el.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Len Brown <lenb@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Regression in linux-next



On 10/16/2017 03:54 PM, Thomas Gleixner wrote:
> On Mon, 16 Oct 2017, Thomas Gleixner wrote:
>> On Mon, 16 Oct 2017, Petri Latvala wrote:
>>>> That should dump the trace buffer when the bug hits. I try to reproduce
>>>> myself.
>>> With those:
>>>
>>> # rtcwake -s 15 -m mem
>>>
>>> [   67.069522] kernel BUG at arch/x86/kernel/apic/vector.c:154!
>>> [   67.075509] invalid opcode: 0000 [#1] PREEMPT SMP
>>> [   67.080481] Dumping ftrace buffer:
>> Hrm. I completely forgot that this does not dump the buffers of offline
>> CPUs. So half of the information is missing. So forget the tracer for now.
>>
>> Can you please apply the debug patch below and provide the full dmesg
>> output?
>>
>> Its going to be too big for LKML so either upload it somewhere or send it
>> to me in private mail.
>>
>> Note, I removed the BUG_ON, so box might survive suspend/resume but it
>> should trigger that printout.
> Forgot to add the counterpart to the clear side. Updated patch below.


http://paste.debian.net/991048/


-- 
Petri Latvala