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New: BUG in gfn_to_pfn_prot

Bug 42980 [email protected] 2 participants 25 messages Mar 22, 2012 – Jun 25, 2014 KVM

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https://bugzilla.kernel.org/show_bug.cgi?id=42980

Summary: BUG in gfn_to_pfn_prot
Product: Virtualization
Version: unspecified
Kernel Version: 3.2.2-gentoo
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No

BUG: unable to handle kernel paging request at ffff87ffffffffff
IP: [<ffffffffa03311b7>] __direct_map.clone.86+0xa7/0x240 [kvm]
PGD 0 
Oops: 0000 [#1] PREEMPT SMP 
CPU 0 
Modules linked in: tun cdc_ether usbnet cdc_acm fuse usbmon pci_stub kvm_intel

kvm netconsole configfs cfq_iosched blk_cgroup snd_seq_oss snd_seq_midi_event snd_seq bridge snd_seq_device ipv6 snd_pcm_oss snd_mixer_oss stp llc coretemp hwmon usblp snd_hda_codec_hdmi snd_hda_codec_realtek usb_storage ftdi_sio usbserial usbhid hid snd_hda_intel i915 snd_hda_codec drm_kms_helper snd_hwdep drm snd_pcm firewire_ohci tpm_tis 8139too tpm firewire_core xhci_hcd i2c_algo_bit snd_timer 8250_pci 8250_pnp ehci_hcd usbcore snd e1000e 8250 tpm_bios crc_itu_t serial_core snd_page_alloc sg rtc_cmos psmouse i2c_i801 mii usb_common video evdev ata_generic pata_acpi button

Pid: 9995, comm: qemu-system-x86 Not tainted 3.2.2-gentoo #1 /DQ67SW

RIP: 0010:[<ffffffffa03311b7>]  [<ffffffffa03311b7>]
__direct_map.clone.86+0xa7/0x240 [kvm]
RSP: 0018:ffff88010bc39b08  EFLAGS: 00010293
RAX: ffff87ffffffffff RBX: 000ffffffffff000 RCX: 0000000000000027
RDX: 0000000029b55000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: ffff88010bc39bb8 R08: ffff87ffffffffff R09: 0000000000113661
R10: 00000000c174f000 R11: 080000000000d974 R12: ffff880000000000
R13: ffff8803b7e6c240 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88043e200000(0063) knlGS:00000000f5ffab70
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffff87ffffffffff CR3: 00000001027f1000 CR4: 00000000000426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process qemu-system-x86 (pid: 9995, threadinfo ffff88010bc38000, task
ffff88000bc154f0)
Stack:
 ffff8803b7e6c240 ffff88010bc39bf0 0000000000000000 0000000000029b55
 ffff88010bc39b38 ffffffffa031ae14 00ff88010bc39bb8 0000000000000000
 0000000000113661 0000000000029b55 0000000029b55000 ffffffffffffffff
Call Trace:
 [<ffffffffa031ae14>] ? gfn_to_pfn_prot+0x14/0x20 [kvm]
 [<ffffffffa03316c0>] tdp_page_fault+0x1a0/0x1e0 [kvm]
 [<ffffffffa032d2e2>] kvm_mmu_page_fault+0x32/0xb0 [kvm]
 [<ffffffffa0362bec>] handle_ept_violation+0x4c/0xd0 [kvm_intel]
 [<ffffffffa0368ff4>] vmx_handle_exit+0xb4/0x6f0 [kvm_intel]
 [<ffffffff8103afad>] ? sub_preempt_count+0x9d/0xd0
 [<ffffffffa0329e23>] kvm_arch_vcpu_ioctl_run+0x473/0xf40 [kvm]
 [<ffffffff8103afad>] ? sub_preempt_count+0x9d/0xd0
 [<ffffffffa03197c2>] kvm_vcpu_ioctl+0x392/0x5e0 [kvm]
 [<ffffffffa031a3ed>] ? kvm_vm_ioctl+0x9d/0x410 [kvm]
 [<ffffffff81315529>] ? sys_sendto+0x119/0x140
 [<ffffffffa0319a65>] kvm_vcpu_compat_ioctl+0x55/0x100 [kvm]
 [<ffffffff810f81df>] ? fget_light+0x8f/0xf0
 [<ffffffff8113ee2e>] compat_sys_ioctl+0x8e/0xff0
 [<ffffffff8105df3c>] ? posix_ktime_get_ts+0xc/0x10
 [<ffffffff8105f190>] ? sys_clock_gettime+0x90/0xb0
 [<ffffffff810860db>] ? compat_sys_clock_gettime+0x7b/0x90
 [<ffffffff813c34c9>] sysenter_dispatch+0x7/0x27
Code: 89 d0 8d 4c ff 0c 4d 89 e0 48 d3 e8 4c 03 45 a8 25 ff 01 00 00 41 39 f6

89 45 bc 89 c0 49 8d 04 c0 48 89 45 b0 0f 84 e1 00 00 00 <4c> 8b 00 41 f6 c0 01 74 40 4c 8b 0d 89 80 01 00 4d 89 c2 4d 21
RIP [<ffffffffa03311b7>] __direct_map.clone.86+0xa7/0x240 [kvm]
RSP <ffff88010bc39b08>
CR2: ffff87ffffffffff

---[ end trace 4db76b33c09285f5 ]---
note: qemu-system-x86[9995] exited with preempt_count 1
usb 2-1.2: USB disconnect, device number 77
INFO: rcu_preempt detected stall on CPU 3 (t=60000 jiffies)
Pid: 3610, comm: kwin Tainted: G      D      3.2.2-gentoo #1
Call Trace:
 <IRQ>  [<ffffffff810a2949>] __rcu_pending+0x1d9/0x420
 [<ffffffff8106f920>] ? tick_nohz_handler+0xe0/0xe0
 [<ffffffff810a2f62>] rcu_check_callbacks+0x122/0x1a0
 [<ffffffff810504c3>] update_process_times+0x43/0x80
 [<ffffffff8106f97b>] tick_sched_timer+0x5b/0xa0
 [<ffffffff81063873>] __run_hrtimer.clone.30+0x63/0x140
 [<ffffffff810641af>] hrtimer_interrupt+0xdf/0x210
 [<ffffffff8101d643>] smp_apic_timer_interrupt+0x63/0xa0
 [<ffffffff813c2b8b>] apic_timer_interrupt+0x6b/0x70
 <EOI>  [<ffffffff810b69a2>] ? __pagevec_free+0x22/0x30
 [<ffffffff813c1862>] ? _raw_spin_lock+0x32/0x40
 [<ffffffff813c1846>] ? _raw_spin_lock+0x16/0x40
 [<ffffffffa0319c3c>] kvm_mmu_notifier_invalidate_page+0x3c/0x90 [kvm]
 [<ffffffff810e31c8>] __mmu_notifier_invalidate_page+0x48/0x60
 [<ffffffff810d6ce5>] try_to_unmap_one+0x3c5/0x3f0
 [<ffffffff810d762d>] try_to_unmap_anon+0x9d/0xe0
 [<ffffffff810d7715>] try_to_unmap+0x55/0x70
 [<ffffffff810e8d21>] migrate_pages+0x2f1/0x4d0
 [<ffffffff810e1ec0>] ? suitable_migration_target+0x50/0x50
 [<ffffffff810e271f>] compact_zone+0x44f/0x7a0
 [<ffffffff810e2c07>] try_to_compact_pages+0x197/0x1f0
 [<ffffffff810b7026>] __alloc_pages_direct_compact+0xc6/0x1c0
 [<ffffffff810b74f9>] __alloc_pages_nodemask+0x3d9/0x7a0
 [<ffffffff813c14b0>] ? _raw_spin_unlock+0x10/0x40
 [<ffffffff810cd2fb>] ? handle_pte_fault+0x3bb/0x9f0
 [<ffffffff810ec831>] do_huge_pmd_anonymous_page+0x131/0x350
 [<ffffffff810cdcae>] handle_mm_fault+0x21e/0x300
 [<ffffffff81027dad>] do_page_fault+0x12d/0x430
 [<ffffffff810d3854>] ? do_mmap_pgoff+0x344/0x380
 [<ffffffff813c1cef>] page_fault+0x1f/0x30
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#1 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Avi Kivity <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #1 from Avi Kivity <[email protected]> 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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#2 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #2 from Luke-Jr <[email protected]> 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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#3 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #3 from Avi Kivity <[email protected]> 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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#4 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #4 from Luke-Jr <[email protected]> 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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#5 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #5 from Avi Kivity <[email protected]> 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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#6 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #6 from Avi Kivity <[email protected]> 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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#7 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #7 from Luke-Jr <[email protected]> 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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#8 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #8 from Avi Kivity <[email protected]> 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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#9 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #9 from Luke-Jr <[email protected]> 2012-05-17 20:58:50 --- The while/ping thing doesn't reproduce it even before the patch. :(

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#10 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #10 from Luke-Jr <[email protected]> 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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#11 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Florian Mickler <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #11 from Florian Mickler <[email protected]> 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 <[email protected]>
Date:   Mon May 14 18:07:56 2012 +0300

KVM: Fix mmu_reload() clash with nested vmx event injection

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#12 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Alan <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|                            |CODE_FIX
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#13 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Luke-Jr <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|RESOLVED                    |REOPENED
         Resolution|CODE_FIX                    |

--- Comment #12 from Luke-Jr <[email protected]> 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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#15 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #14 from Luke-Jr <[email protected]> 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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#17 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Alan <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|3.2.2-gentoo |3.4

--- Comment #16 from Alan <[email protected]> 2012-08-16 09:32:17 --- Thanks

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#18 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

Ian Pilcher <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #17 from Ian Pilcher <[email protected]> 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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#19 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #18 from Ian Pilcher <[email protected]> 2012-11-17 22:10:45 --- (In reply to comment #11)

Quoted 7 lines

A patch referencing this bug report has been merged in Linux v3.5-rc1:

commit d8368af8b46b904def42a0f341d2f4f29001fa77

Author: Avi Kivity <[email protected]>
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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#20 lore raw

Re: [Bug 42980] BUG in gfn_to_pfn_prot

Quoted 10 lines · On 11/18/2012 12:10 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #18 from Ian Pilcher <[email protected]> 2012-11-17 22:10:45 --- (In reply to comment #11)

Quoted 2 lines

A patch referencing this bug report has been merged in Linux v3.5-rc1:

Quoted 9 lines
Quoted 5 lines

commit d8368af8b46b904def42a0f341d2f4f29001fa77

Author: Avi Kivity <[email protected]>
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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error compiling committee.c: too many arguments to function
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#21 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #19 from Avi Kivity <[email protected]> 2012-11-18 14:15:41 ---

Quoted 10 lines · On 11/18/2012 12:10 AM, [email protected] wrote:

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #18 from Ian Pilcher <[email protected]> 2012-11-17 22:10:45 --- (In reply to comment #11)

Quoted 2 lines

A patch referencing this bug report has been merged in Linux v3.5-rc1:

Quoted 9 lines
Quoted 5 lines

commit d8368af8b46b904def42a0f341d2f4f29001fa77

Author: Avi Kivity <[email protected]>
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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#22 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #20 from Ian Pilcher <[email protected]> 2012-11-18 17:06:36 --- (In reply to comment #19)

Quoted 2 lines

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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#23 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

--- Comment #21 from Ian Pilcher <[email protected]> 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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#24 lore raw

[Bug 42980] BUG in gfn_to_pfn_prot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=42980

[email protected] changed:

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CC| |[email protected]

--- Comment #22 from [email protected] ---
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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