[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [ 3009.778974] mcelog:16842 map pfn expected mapping type write-back for [mem 0x0009f000-0x000a0fff], got uncached-minus
Saturday, November 17, 2012, 3:14:10 PM, you wrote: > Konrad Rzeszutek Wilk wrote: >> On Fri, Nov 16, 2012 at 05:47:54PM +0100, Sander Eikelenboom wrote: >>> >>> Friday, November 16, 2012, 5:07:33 PM, you wrote: >>> >>>> On Fri, Nov 16, 2012 at 01:40:56PM +0100, Sander Eikelenboom wrote: >>>>> 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 ? >>> >>>> The reason we get is b/c I had to disable the PAT functionality in >>>> the Linux kernel for Xen. This is b/c it only worked one way - >>>> meaning you could convert a page from >>>> WriteBack to WriteCombine or WriteBack to Uncached. But you could >>>> not >>>> do WriteCombine back to WriteBack - due to one of the functions that >>>> changes the bits was using an "unfiltered" way to identify the bits >>>> on the >>>> page. >>> >>>> Anyhow, we had a disaster b/c some of these pages that used to >>>> WriteBack (WB) >>>> got converted to WriteCombine (WC) and then were returned back as >>>> such >>>> to the page pool. And if they were re-used by filesystem invariably >>>> we got >>>> corruptions. >>> >>>> So until the PAT table lookup thing that Peter H. Anvin suggested >>>> gets implemented this splat gotta show up :-( >>> >>> Not a big problem for me, i was just wondering :-) >>> I'm more interested in the netfront troubles, since it's already rc5. >>> >>>> Does mcelog still work even with this warning? >>> >>> Not the daemon: >>> >>> serveerstertje:~# sh /etc/init.d/mcelog start >>> Starting Machine Check Exceptions decoder: daemon: Cannot allocate >>> memory >>> >> Ugh. >> CC-ing Liu here. >> > How to reproduce it (sorry I miss the history of this thread)? > I have a try at Xen side, w/ kernel 3.6.0-rc7+, no problem at my side. I'm using: - Xen-unstable, latest changeset=26152 - Linux 3.7.0-rc5 kernel latest changeset=79e979eae0df58831e85281e3285f63663f3cf76 - Dom0 OS = Debian Squeeze - mcelog package: 1.0~pre3-3 x86-64 Machine Check Exceptions collector and decoder) I don't have particular interest in mcelog, but i just encountered this warn on boot. The warn (see above) is shown when the mcelog daemon (from the debian package) tries to start (for example on boot) I have attached the .config from the used kernel. If you need any more info, please ask ! -- Sander > Thanks, > Jinsong >>> >>>>> >>>>> -- >>>>> Sander Attachment:
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