[Xen-devel] [ 3009.778974] mcelog:16842 map pfn expected mapping type write-back for [mem 0x0009f000-0x000a0fff], got uncached-minus

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi Konrad,

Sometime ago i reported this one at boot up:

[ 3009.778974] mcelog:16842 map pfn expected mapping type write-back for [mem 
0x0009f000-0x000a0fff], got uncached-minus
[ 3009.788570] ------------[ cut here ]------------
[ 3009.798175] WARNING: at arch/x86/mm/pat.c:774 untrack_pfn+0xa1/0xb0()
[ 3009.807966] Hardware name: MS-7640
[ 3009.817677] Modules linked in:
[ 3009.827524] Pid: 16842, comm: mcelog Tainted: G        W    
3.7.0-rc5-20121116-reverted-persistent-warn-patwarn #1
[ 3009.837415] Call Trace:
[ 3009.847110]  [<ffffffff810674fa>] warn_slowpath_common+0x7a/0xb0
[ 3009.856857]  [<ffffffff81067545>] warn_slowpath_null+0x15/0x20
[ 3009.866562]  [<ffffffff81042041>] untrack_pfn+0xa1/0xb0
[ 3009.876201]  [<ffffffff8111a59b>] unmap_single_vma+0x86b/0x8e0
[ 3009.885895]  [<ffffffff81100f16>] ? release_pages+0x196/0x1f0
[ 3009.895488]  [<ffffffff8111a65c>] unmap_vmas+0x4c/0xa0
[ 3009.905134]  [<ffffffff8111c8fa>] exit_mmap+0x9a/0x180
[ 3009.914706]  [<ffffffff81064e72>] mmput+0x52/0xd0
[ 3009.924252]  [<ffffffff810652b7>] dup_mm+0x3c7/0x510
[ 3009.933839]  [<ffffffff81065fd5>] copy_process+0xac5/0x14a0
[ 3009.943430]  [<ffffffff81066af3>] do_fork+0x53/0x360
[ 3009.952843]  [<ffffffff810b25c7>] ? lock_release+0x117/0x250
[ 3009.962283]  [<ffffffff817d26c0>] ? _raw_spin_unlock+0x30/0x60
[ 3009.971532]  [<ffffffff817d3495>] ? sysret_check+0x22/0x5d
[ 3009.980820]  [<ffffffff81017523>] sys_clone+0x23/0x30
[ 3009.990046]  [<ffffffff817d37f3>] stub_clone+0x13/0x20
[ 3009.999335]  [<ffffffff817d3469>] ? system_call_fastpath+0x16/0x1b
[ 3010.008667] ---[ end trace 2d9694c2c0a24da8 ]---


It seems to be due to the "mcelog" userspace tool provided with Debian Squeeze 
(mcelog 1.0~pre3-3  x86-64 Machine Check Exceptions collector and decoder).
I can trigger this warning easily by restarting the mcelog tool with 
/etc/init.d/mcelog restart

Should that one also function with the xen mcelog driver, or is a newer version 
required ?

--
Sander


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