linux-kernel - KVM: WARNING: at .. kvm_release_pfn

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Message-ID: <506E9B77.60505@suse.cz>
Date:	Fri, 05 Oct 2012 10:33:59 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: KVM: WARNING: at .. kvm_release_pfn_clean

Hi,

I'm getting this warning while running qemu-kvm 1.2.rc1 on the top of
3.6.0-next-20121001:
WARNING: at virt/kvm/kvm_main.c:1325 kvm_release_pfn_clean+0x70/0x80()
Hardware name: To Be Filled By O.E.M.
Modules linked in: nls_cp437 vfat fat dvb_usb_dib0700 dib0090 dib7000p
dib7000m dib0070 dib8000 dib3000mc dibx000_common microcode
Pid: 11848, comm: qemu-kvm Tainted: G        W
3.6.0-next-20121001_64+ #70
Call Trace:
 [<ffffffff8107f19f>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff8107f1fa>] warn_slowpath_null+0x1a/0x20
 [<ffffffff81004cd0>] kvm_release_pfn_clean+0x70/0x80
 [<ffffffff81027ac6>] paging64_page_fault+0x686/0x830
 [<ffffffff81024745>] ? paging64_gva_to_gpa+0x35/0x80
 [<ffffffff81021121>] kvm_mmu_page_fault+0x31/0x100
 [<ffffffff81040e81>] handle_exception+0x231/0x3d0
 [<ffffffff81041fbc>] vmx_handle_exit+0xcc/0x780
 [<ffffffff8101be44>] kvm_arch_vcpu_ioctl_run+0x444/0xf60
 [<ffffffff81017117>] ? kvm_arch_vcpu_load+0x57/0x1b0
 [<ffffffff81005302>] kvm_vcpu_ioctl+0x472/0x610
 [<ffffffff811aa36b>] ? fsnotify+0x24b/0x340
 [<ffffffff8117d609>] do_vfs_ioctl+0x99/0x580
 [<ffffffff810b620b>] ? pick_next_task_fair+0x13b/0x1a0
 [<ffffffff810b4f68>] ? __enqueue_entity+0x78/0x80
 [<ffffffff81010114>] ? kvm_on_user_return+0x64/0x70
 [<ffffffff8117db40>] sys_ioctl+0x50/0x90
 [<ffffffff816a46e2>] system_call_fastpath+0x16/0x1b

I.e. is_error_pfn(pfn) is true.

regards,
-- 
js
suse labs
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