linux-kernel - CPA warning when running dmidecode on 2.6.29-rc1

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Message-ID: <adaab9tivab.fsf@cisco.com>
Date:	Wed, 14 Jan 2009 10:42:36 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	linux-kernel@...r.kernel.org
Subject: CPA warning when running dmidecode on 2.6.29-rc1

I just got the following when trying to dmidecode on a system running
2.6.29-rc1-git... STRICT_DEVMEM isn't set.  Let me know if any further
info would be helpful...

[72673.717016] ------------[ cut here ]------------
[72673.721697] WARNING: at /scratch/Ksrc/linux-git/arch/x86/mm/pageattr.c:560 __change_page_attr_set_clr+0xe2/0x867()
[72673.732061] Hardware name: PowerEdge SC1435
[72673.736260] CPA: called for zero pte. vaddr = ffff8800dffbc000 cpa->vaddr = ffff8800dffbc000
[72673.744710] Modules linked in: tun nfs lockd nfs_acl auth_rpcgss sunrpc ipv6 bridge stp llc dm_snapshot dm_mirror dm_region_hash dm_log dm_mod kvm_amd kvm loop evdev ib_mthca thermal serio_raw psmouse pcspkr ib_mad ib_core ohci_hcd ehci_hcd tg3 libphy processor dcdbas
[72673.769213] Pid: 2622, comm: dmidecode Not tainted 2.6.29-rc1 #38
[72673.775329] Call Trace:
[72673.777802]  [<ffffffff80233cc5>] warn_slowpath+0xd8/0x112
[72673.783310]  [<ffffffff8026f178>] __alloc_pages_internal+0xd2/0x40e
[72673.789596]  [<ffffffff80310f15>] do_get_write_access+0x3c6/0x408
[72673.795705]  [<ffffffff80278b18>] zone_statistics+0x3c/0x5f
[72673.801292]  [<ffffffff80222e64>] __change_page_attr_set_clr+0xe2/0x867
[72673.807916]  [<ffffffff802855ae>] __purge_vmap_area_lazy+0x146/0x155
[72673.814274]  [<ffffffff802869b7>] vm_unmap_aliases+0x16f/0x180
[72673.820107]  [<ffffffff80223734>] change_page_attr_set_clr+0x14b/0x2fa
[72673.826643]  [<ffffffff802239eb>] _set_memory_wb+0x1d/0x20
[72673.832136]  [<ffffffff80224c71>] reserve_pfn_range+0x1a2/0x233
[72673.838066]  [<ffffffff8027d966>] remap_pfn_range+0x8f/0x342
[72673.843732]  [<ffffffff80224795>] reserve_memtype+0x193/0x4cd
[72673.849480]  [<ffffffff8022509e>] phys_mem_access_prot_allowed+0xb4/0x1aa
[72673.856275]  [<ffffffff803c79d8>] mmap_mem+0x6c/0x91
[72673.861249]  [<ffffffff8028205c>] mmap_region+0x2e0/0x57d
[72673.866657]  [<ffffffff80282585>] do_mmap_pgoff+0x28c/0x2f3
[72673.872240]  [<ffffffff8020fa7f>] sys_mmap+0x8c/0xc5
[72673.877212]  [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b
[72673.883227] ---[ end trace 592fdf59445922ef ]---
[72673.887864] dmidecode:2622 reserve_pfn_range ioremap_change_attr failed write-back for dffbc000-dffbd000
[72673.897346] dmidecode:2622 freeing invalid memtype dffbc000-dffbd000
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