* [Bug 42980] BUG in gfn_to_pfn_prot
2012-03-22 21:28 [Bug 42980] New: BUG in gfn_to_pfn_prot bugzilla-daemon
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To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42980
Avi Kivity <avi@redhat.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |avi@redhat.com
--- Comment #1 from Avi Kivity <avi@redhat.com> 2012-03-28 13:03:25 ---
0: 89 d0 mov %edx,%eax
2: 8d 4c ff 0c lea 0xc(%rdi,%rdi,8),%ecx
6: 4d 89 e0 mov %r12,%r8
9: 48 d3 e8 shr %cl,%rax
c: 4c 03 45 a8 add -0x58(%rbp),%r8
10: 25 ff 01 00 00 and $0x1ff,%eax
15: 41 39 f6 cmp %esi,%r14d
18: 89 45 bc mov %eax,-0x44(%rbp)
1b: 89 c0 mov %eax,%eax
1d: 49 8d 04 c0 lea (%r8,%rax,8),%rax
21: 48 89 45 b0 mov %rax,-0x50(%rbp)
25: 0f 84 e1 00 00 00 je 0x10c
2b: 4c 8b 00 mov (%rax),%r8
2e: 41 f6 c0 01 test $0x1,%r8b
32: 74 40 je 0x74
34: 4c 8b 0d 89 80 01 00 mov 0x18089(%rip),%r9 # 0x180c4
3b: 4d 89 c2 mov %r8,%r10
Appears to be __direct_map()'s
if (!is_shadow_present_pte(*iterator.sptep)) {
u64 base_addr = iterator.addr;
%rax is 0xffff87ffffffffff. That is one less than the base of the direct map of
all physical memory. So it looks like the code
static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
{
if (iterator->level < PT_PAGE_TABLE_LEVEL)
return false;
iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level);
iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) +
iterator->index;
return true;
}
saw iterator->shadow_addr == -1ULL.
That might be INVALID_PAGE assigned to pae_root (but that is masked out in
shadow_walk_init()) or a stray -1 due to a completely unrelated bug.
Anything interesting about how this was triggered?
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--- Comment #2 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-03-28 13:37:53 ---
IIRC, it was pretty out of the blue. I might have had one or both of two KVMs
running in the background at the time:
- 64-bit Gentoo with a Radeon 5850 passthrough'd (VT-d)
- 32-bit Ubuntu with a nested 32-bit KVM
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--- Comment #3 from Avi Kivity <avi@redhat.com> 2012-03-28 13:45:25 ---
You're a brave one.
It wasn't the nested one (at least, it wasn't running in the guest's guest at
the moment of the crash), but it might be related.
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--- Comment #4 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-03-28 13:49:26 ---
I suppose I should mention I'd been running both of these stable for at least a
month now (and the GPU passthrough for nearly a full year). One factor that
might (or might not) be related - the GPU fan recently died. When this crash
took me down, I removed the GPU, so I won't be able to do any further testing
with that setup (unless I find another similar GPU at a good price).
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--- Comment #5 from Avi Kivity <avi@redhat.com> 2012-03-28 15:07:25 ---
vcpu_enter_guest()
kvm_mmu_reload() // now root_hpa is valid
inject_pending_event()
vmx_interrupt_allowed()
nested_vmx_vmexit()
load_vmcs12_host_state()
kvm_mmu_reset_context() // root_hpa now invalid
kvm_guest_enter()
... page fault because root_hpa is invalid, oops
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--- Comment #6 from Avi Kivity <avi@redhat.com> 2012-05-10 10:53:48 ---
Created an attachment (id=73244)
--> (https://bugzilla.kernel.org/attachment.cgi?id=73244)
Fix
Please test the attached patch.
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--- Comment #7 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-05-10 13:17:17 ---
Is there anything I can do to reproduce the problem condition for the test? It
seems to only occur about once every 6 months normally.
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--- Comment #8 from Avi Kivity <avi@redhat.com> 2012-05-10 13:30:36 ---
Try running
while :; do :; done
in the nested (L2) guest, and ping -f the L1 guest from the host.
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--- Comment #9 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-05-17 20:58:50 ---
The while/ping thing doesn't reproduce it even before the patch. :(
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--- Comment #10 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-06-16 03:16:44 ---
For what it's worth, no crashes in over a month. But it wasn't common enough
that it can't be coincidence either...
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Florian Mickler <florian@mickler.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |florian@mickler.org
--- Comment #11 from Florian Mickler <florian@mickler.org> 2012-07-01 09:46:47 ---
A patch referencing this bug report has been merged in Linux v3.5-rc1:
commit d8368af8b46b904def42a0f341d2f4f29001fa77
Author: Avi Kivity <avi@redhat.com>
Date: Mon May 14 18:07:56 2012 +0300
KVM: Fix mmu_reload() clash with nested vmx event injection
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To: kvm
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Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |alan@lxorguk.ukuu.org.uk
Resolution| |CODE_FIX
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Luke-Jr <luke-jr+linuxbugs@utopios.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|CODE_FIX |
--- Comment #12 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-08-15 22:24:36 ---
Sorry I didn't report it sooner, but I have had the same crash since June, with
this patch. :(
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--- Comment #13 from Alan <alan@lxorguk.ukuu.org.uk> 2012-08-15 22:34:02 ---
Which kernel ?
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--- Comment #14 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-08-15 22:38:45 ---
I'm not sure if it was 3.4.0, 3.4.3, or 3.4.4. Since May 17, I have been
building all my kernels (including those) with this patch applied.
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--- Comment #15 from Luke-Jr <luke-jr+linuxbugs@utopios.org> 2012-08-15 22:47:39 ---
3.4.0: http://luke.dashjr.org/tmp/code/20120624_002.jpg
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Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|3.2.2-gentoo |3.4
--- Comment #16 from Alan <alan@lxorguk.ukuu.org.uk> 2012-08-16 09:32:17 ---
Thanks
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To: kvm
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Ian Pilcher <arequipeno@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |arequipeno@gmail.com
--- Comment #17 from Ian Pilcher <arequipeno@gmail.com> 2012-11-17 22:00:39 ---
I just hit this.
Host: Intel DQ67SW, Core i7 2600, 24GB RAM
BIOS: SWQ6710H.86A.0065.2012.0917.1519
Host OS: Fedora 17
kernel-3.6.6-1.fc17.x86_64
qemu-kvm-1.2.0-20.fc17.x86_64
L1 Guest OS: RHEL 6.3
kernel-2.6.32-279.14.1.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.295.el6_3.5.x86_64
L2 Guest OS: RHEL 6.3
kernel-2.6.32-279.14.1.el6.x86_64
I was running a Pulp sync between a couple of L2 guests when this occurred,
which presumably generated quite a bit of traffic across the virtual bridges.
I am using Open vSwitch for all of the bridges on the host OS. The virtualized
RHEV hypervisors use standard Linux bridges.
Please let me know if I can provide any additional information to help track
this down.
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From: bugzilla-daemon @ 2012-11-17 22:10 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42980
--- Comment #18 from Ian Pilcher <arequipeno@gmail.com> 2012-11-17 22:10:45 ---
(In reply to comment #11)
> A patch referencing this bug report has been merged in Linux v3.5-rc1:
>
> commit d8368af8b46b904def42a0f341d2f4f29001fa77
> Author: Avi Kivity <avi@redhat.com>
> Date: Mon May 14 18:07:56 2012 +0300
>
> KVM: Fix mmu_reload() clash with nested vmx event injection
Silly question. Is this patch applicable to the physical host, the L1 guest
(virtualized hypervisor), or both?
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From: Avi Kivity @ 2012-11-18 14:15 UTC (permalink / raw)
To: bugzilla-daemon; +Cc: kvm
On 11/18/2012 12:10 AM, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=42980
>
>
>
>
>
> --- Comment #18 from Ian Pilcher <arequipeno@gmail.com> 2012-11-17 22:10:45 ---
> (In reply to comment #11)
>> A patch referencing this bug report has been merged in Linux v3.5-rc1:
>>
>> commit d8368af8b46b904def42a0f341d2f4f29001fa77
>> Author: Avi Kivity <avi@redhat.com>
>> Date: Mon May 14 18:07:56 2012 +0300
>>
>> KVM: Fix mmu_reload() clash with nested vmx event injection
>
> Silly question. Is this patch applicable to the physical host, the L1 guest
> (virtualized hypervisor), or both?
>
The physical host. If you want to run a hypervisor in L2, you need to
apply it to L1 as well.
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From: bugzilla-daemon @ 2012-11-18 14:15 UTC (permalink / raw)
To: kvm
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--- Comment #19 from Avi Kivity <avi@redhat.com> 2012-11-18 14:15:41 ---
On 11/18/2012 12:10 AM, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=42980
>
>
>
>
>
> --- Comment #18 from Ian Pilcher <arequipeno@gmail.com> 2012-11-17 22:10:45 ---
> (In reply to comment #11)
>> A patch referencing this bug report has been merged in Linux v3.5-rc1:
>>
>> commit d8368af8b46b904def42a0f341d2f4f29001fa77
>> Author: Avi Kivity <avi@redhat.com>
>> Date: Mon May 14 18:07:56 2012 +0300
>>
>> KVM: Fix mmu_reload() clash with nested vmx event injection
>
> Silly question. Is this patch applicable to the physical host, the L1 guest
> (virtualized hypervisor), or both?
>
The physical host. If you want to run a hypervisor in L2, you need to
apply it to L1 as well.
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^ permalink raw reply [flat|nested] 25+ messages in thread* [Bug 42980] BUG in gfn_to_pfn_prot
2012-03-22 21:28 [Bug 42980] New: BUG in gfn_to_pfn_prot bugzilla-daemon
` (19 preceding siblings ...)
2012-11-18 14:15 ` bugzilla-daemon
@ 2012-11-18 17:06 ` bugzilla-daemon
2012-12-08 20:50 ` bugzilla-daemon
2014-06-25 2:11 ` bugzilla-daemon
22 siblings, 0 replies; 25+ messages in thread
From: bugzilla-daemon @ 2012-11-18 17:06 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42980
--- Comment #20 from Ian Pilcher <arequipeno@gmail.com> 2012-11-18 17:06:36 ---
(In reply to comment #19)
> The physical host. If you want to run a hypervisor in L2, you need to
> apply it to L1 as well.
OK. If I'm parsing that correctly, it sounds like backporting the patch to the
RHEL 6 kernel, so I could run it in the L1 hypervisors, wouldn't help anything.
Bummer.
Any ideas on how I can make this environment stable?
I see that Luke-Jr is also on a DQ67SW, and he's doing PCI passthrough. I do
have VT-d enabled, although I'm not actually doing any PCI-passthrough. I that
something that could be related to this?
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^ permalink raw reply [flat|nested] 25+ messages in thread* [Bug 42980] BUG in gfn_to_pfn_prot
2012-03-22 21:28 [Bug 42980] New: BUG in gfn_to_pfn_prot bugzilla-daemon
` (20 preceding siblings ...)
2012-11-18 17:06 ` bugzilla-daemon
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2014-06-25 2:11 ` bugzilla-daemon
22 siblings, 0 replies; 25+ messages in thread
From: bugzilla-daemon @ 2012-12-08 20:50 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42980
--- Comment #21 from Ian Pilcher <arequipeno@gmail.com> 2012-12-08 20:50:25 ---
I just hit this again (I think). Pretty much out of the blue, with a bunch of
VMs running, including at least 2 nested guests.
I have been trying to get a kdump of this, and I believe that I was at least
somewhat successful. The system didn't dump automatically, but I was able to
get it to do so by hitting alt-sysrq-c. The vmcore file is 3.7G, so
suggestions as to a place to post it publicly would be appreciated.
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^ permalink raw reply [flat|nested] 25+ messages in thread* [Bug 42980] BUG in gfn_to_pfn_prot
2012-03-22 21:28 [Bug 42980] New: BUG in gfn_to_pfn_prot bugzilla-daemon
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2012-12-08 20:50 ` bugzilla-daemon
@ 2014-06-25 2:11 ` bugzilla-daemon
22 siblings, 0 replies; 25+ messages in thread
From: bugzilla-daemon @ 2014-06-25 2:11 UTC (permalink / raw)
To: kvm
https://bugzilla.kernel.org/show_bug.cgi?id=42980
xerofoify@gmail.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |xerofoify@gmail.com
--- Comment #22 from xerofoify@gmail.com ---
Please tell against a newer kernel. This bug seems obsolete to me as of
kernel versions released in 2014 time frame.
Cheers Nick
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