linux-kernel - Re: [PATCH] perf/x86/intel/uncore: fix IMC missing box initialization

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Date:	Fri, 24 Apr 2015 14:22:26 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Liang, Kan" <kan.liang@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>, Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH] perf/x86/intel/uncore: fix IMC missing box initialization

On Fri, Apr 24, 2015 at 9:38 AM, Stephane Eranian <eranian@...gle.com> wrote:
> On Fri, Apr 24, 2015 at 7:03 AM, Vince Weaver <vincent.weaver@...ne.edu> wrote:
>> On Fri, 24 Apr 2015, Vince Weaver wrote:
>>
>>> [   79.473121] kernel BUG at mm/vmalloc.c:1335!
>>> [   79.477705] invalid opcode: 0000 [#1] SMP
>> ...
>>> [   79.694391] Call Trace:
>>> [   79.696997]  <IRQ>
>>> [   79.699090]  [<ffffffff811b2130>] get_vm_area_caller+0x40/0x50
>>> [   79.705505]  [<ffffffff81039f4d>] ? snb_uncore_imc_init_box+0x6d/0x90
>>
>> This maps to:
>>
>>         static void snb_uncore_imc_init_box(struct intel_uncore_box *box) {
>>                 ...
>>                 box->io_addr = ioremap(addr, SNB_UNCORE_PCI_IMC_MAP_SIZE);
>>
>> The machine I am seeing this on is a Haswell desktop, Intel 6/60/3.
>>
> I also got that on one Lenovo IvyBridge laptop but I had just updated the BIOS.
> It was working before with older kernels. I am not sure what is going on here.
> It will be easier to debug once I get my desktop Haswell back and setup with
> serial console. Need to verify that the address of the BAR is the same compared
> with older kernels.
>
> Maybe Bjorn can shed some lights. Why would ioremap() die like this in the
> latest 4.0 tree.

  1328  static struct vm_struct *__get_vm_area_node(unsigned long size,
  1329                  unsigned long align, unsigned long flags,
unsigned long start,
  1330                  unsigned long end, int node, gfp_t gfp_mask,
const void *caller)
  1331  {
  1332          struct vmap_area *va;
  1333          struct vm_struct *area;
  1334
  1335          BUG_ON(in_interrupt());           <-----------------

Is there some perfmon initialization happening in interrupt context?
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