Re: [Xen-devel] Kernel 3.7.0-pre-rc1: mcelog:4344 map pfn expected mapping type write-back for [mem 0x0009f000-0x000a0fff], got uncached-minus, WARNING: at arch/x86/mm/pat.c:774 untrack_pfn+0x8c/0xc0()

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Wed, Oct 10, 2012 at 09:07:51PM +0200, Sander Eikelenboom wrote:
> 
> Wednesday, October 10, 2012, 8:50:57 PM, you wrote:
> 
> > On Wed, Oct 10, 2012 at 05:58:18PM +0200, Sander Eikelenboom wrote:
> >> Hi Konrad,
> >> 
> >> On boot with a 3.7.0-pre-rc1 (latest commit is 
> >> 42859eea96ba6beabfb0369a1eeffa3c7d2bd9cb) i always get:
> >> 
> >> 
> >> [   75.718807] mcelog:4344 map pfn expected mapping type write-back for 
> >> [mem 0x0009f000-0x000a0fff], got uncached-minus
> >> [   75.725282] ------------[ cut here ]------------
> >> [   75.731316] WARNING: at arch/x86/mm/pat.c:774 untrack_pfn+0x8c/0xc0()
> >> [   75.737465] Hardware name: MS-7640
> >> [   75.743678] Modules linked in:
> >> [   75.749528] Pid: 4344, comm: mcelog Not tainted 3.6.0pre-rc1-20121010 #1
> >> [   75.755581] Call Trace:
> >> [   75.761303]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
> >> [   75.767036]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
> >> [   75.772804]  [<ffffffff8104102c>] untrack_pfn+0x8c/0xc0
> >> [   75.778391]  [<ffffffff81118ffb>] unmap_single_vma+0x86b/0x8e0
> >> [   75.784002]  [<ffffffff810ff926>] ? release_pages+0x196/0x1f0
> >> [   75.789484]  [<ffffffff81745a25>] ? 
> >> _raw_spin_unlock_irqrestore+0x75/0xa0
> >> [   75.794970]  [<ffffffff811190bc>] unmap_vmas+0x4c/0xa0
> >> [   75.800375]  [<ffffffff8111b35a>] exit_mmap+0x9a/0x180
> >> [   75.805748]  [<ffffffff81063e52>] mmput+0x52/0xd0
> >> [   75.811046]  [<ffffffff81064297>] dup_mm+0x3c7/0x510
> >> [   75.816380]  [<ffffffff81064fc5>] copy_process+0xad5/0x14b0
> >> [   75.821777]  [<ffffffff81065ae3>] do_fork+0x53/0x360
> >> [   75.827114]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
> >> [   75.832380]  [<ffffffff81745a80>] ? _raw_spin_unlock+0x30/0x60
> >> [   75.837977]  [<ffffffff81746835>] ? sysret_check+0x22/0x5d
> >> [   75.843337]  [<ffffffff81016503>] sys_clone+0x23/0x30
> >> [   75.848567]  [<ffffffff81746b93>] stub_clone+0x13/0x20
> >> [   75.853718]  [<ffffffff81746809>] ? system_call_fastpath+0x16/0x1b
> >> [   75.858913] ---[ end trace df00fd3532db355c ]---
> >> 
> >> 
> >> xl dmesg and dmesg attached.
> 
> > Heh. Not seeing them.
> 
> > But more importantly, do you have CONFIG_XEN_MCE.. something enabled?
> 
> # grep XEN_MCE .config
> # CONFIG_XEN_MCE_LOG is not set
> 
> Nope

If you enable that, do these issues go away?

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