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Subject: Re: Regression in linux-next
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu Chen <yu.c.chen@intel.com>, Juergen Gross <jgross@suse.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Tony Luck <tony.luck@intel.com>, Marc Zyngier <marc.zyngier@arm.com>,
        Alok Kataria <akataria@vmware.com>, Joerg Roedel <joro@8bytes.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Steven Rostedt <rostedt@goodmis.org>, Christoph Hellwig <hch@lst.de>,
        Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>,
        Paolo Bonzini <pbonzini@redhat.com>, Rui Zhang <rui.zhang@intel.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Dan Williams <dan.j.williams@intel.com>, Len Brown <lenb@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
References: <c3f2d5df-2fd9-5e7f-b744-144e0575f61b@intel.com>
 <20171013110850.GA5303@yu-chen.sh.intel.com>
 <149ec6e8-4189-040c-a53c-12b0a51a855e@intel.com>
 <c1f48dee-bf92-4076-eb15-6e306786bf50@intel.com>
 <e1689005-7e4e-a3c9-5f81-57d337a57a2f@intel.com>
 <cd667019-c16e-60db-7c5d-f2f1cf8d7351@intel.com>
 <alpine.DEB.2.20.1710161237260.1973@nanos>
 <e3598cc0-429d-c47f-f300-c955466481d1@intel.com>
 <alpine.DEB.2.20.1710161402380.1973@nanos>
 <alpine.DEB.2.20.1710161452560.1973@nanos>
From: Petri Latvala <petri.latvala@intel.com>
Message-ID: <9923015d-ea50-27d1-1a38-f661f05dd09f@intel.com>
Date: Mon, 16 Oct 2017 16:10:07 +0300
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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