[Qemu-devel] [Bug 1037675] [NEW] Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Qemu-devel] [Bug 1037675] [NEW] Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

Public bug reported:

After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
machines (running gentoo linux) panic at intel_pmu_init. (detailed
information including stacktrace are in the uploaded screenshot). When i
remove the "-cpu host" option, the system starts normally.

the command line from whicht the system is bootet:

qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm -cpu
host -monitor unix:/var/run/qemu-kvm/wgs-l08.monitor,server,nowait

also reported on gentoo bug tracker (with some more details of the
host): https://bugs.gentoo.org/show_bug.cgi?id=431640

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

** Attachment added: "kernel panic screenshot"
   https://bugs.launchpad.net/bugs/1037675/+attachment/3264111/+files/kernel_panic.png

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Michael Tokarev]

First of all, your kernel panic screenshot is incomplete: it lacks the
most important information which were scrolled off the (virtual) screen.
Please enable serial console and capture whole OOPs in a text form.

Second, it isn't clear whenever this is HOST kernel panic or GUEST
kernel panic.  I assume it is guest.

Third, you nevrer said which guest (kernel) it is.

And forth, gentoo is very well known for breaking qemu-kvm by their
"hardened" patches. Disable the hardening and retry.

/mjt

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

sorry for the not very usefull information i provides above.

i will try to reproduce the the failure with a vailla kernel (host) in
a few days. currently the server is in use and cannot be restarted.

the kernel panic was in the guest (thought this is clear by "my vm
panic"). If it is reproducable with a vannilla kernel (host) i will
provide more detailed information here. the vm is using a 3.3.8 gentoo
kernel (not hardened).

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Stefan Kuhn]

I have the same issue, but not on hardened.
Tried for 1-2 hours to send the output to serial console but failed.
The text below is what I posted at https://bugs.gentoo.org/show_bug.cgi?id=431640#c8:
###############

Same issue here (same screenshot with qemu-kvm-1.1.1-r1), but not on hardened. 
Happens with 1.1.1-r3 with a different panic message (not the one
mentioned in bug #431444)

I fail miserably at "sending output to serial console or file", if anyone
would help me there I could provide the entire output of the kernel panic.

Below is what I've found out to far:
(Tests with qemu-kvm-1.1.1-r1)

Analysis:
=========
Happens with the following LiveCDs:
- Fedora-17-x86_64-netinst.iso: uname -r = 3.3.4-5.fc17.x86_64; image: /LiveOS/squashfs.img
- pentoo-x86_64-2012.0_beta1.7.iso: uname -r = 3.4.2-pentoo; image: image.squashfs

Does not happen with:
- pentoo-x86_64-2009.0.iso: uname -r = 2.6.31-pentoo-r3; image: image.squashfs
- (Gentoo) install-amd64-minimal-20120621.iso: uname -r = 3.2.12-gentoo; image.squashfs
- systemrescuecd-x86-2.8.1.iso (64bit kernel): uname -r = 3.2.23-std281-amd64: sysrcd.dat

Tried installing qemu-kvm-1.1.1-r1 without the 2 patches, no difference.

Guess:
======
This seems to happen only with newer guest-kernels (on newer CPUs).

Hardware-Info:
==============
see attachments

** Bug watch added: Gentoo Bugzilla #431640
   https://bugs.gentoo.org/show_bug.cgi?id=431640

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Michael Tokarev]

Correcting myself (comment #2):

> And forth, gentoo is very well known for breaking qemu-kvm by their
"hardened" patches. Disable the hardening and retry.

I mean the (host) KERNEL hardering, not qemu-kvm userspace hardering
there.  Sorry for any potential confusion.

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

thx for the patience, i am currently very busy, therefore this took a
bit longer than it was planed:

- using a non hardened kernel (gentoo-sources-3.3.8) does not resolve
the issue

therefore i need to use the serial console, which is  somewhat new to
me. i will do this as soon as i find some time.  i am still on it ;)

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

ok getting the serial console to work was not that hard. here is the
relevant serial output of the failing guest (full output is attached as
file):

[    0.010706] mce: CPU supports 10 MCE banks
[    0.011279] ACPI: Core revision 20110623
[    0.014769] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.025876] CPU0: Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz stepping 07
[    0.027998] Performance Events: 
[    0.027998] general protection fault: 0000 [#1] SMP 
[    0.027998] CPU 0 
[    0.027998] Modules linked in:
[    0.027998] 
[    0.027998] Pid: 1, comm: swapper/0 Not tainted 3.2.12-gentoo #1 Bochs Bochs
[    0.027998] RIP: 0010:[<ffffffff81aa553f>]  [<ffffffff81aa553f>] intel_pmu_init+0x283/0x85e
[    0.027998] RSP: 0018:ffff88000f8b9ea0  EFLAGS: 00000202
[    0.027998] RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000345
[    0.027998] RDX: 0000000000000003 RSI: 0000000007280202 RDI: ffffffff81a7efa8
[    0.027998] RBP: ffff88000f8b9eb0 R08: 0000000000000000 R09: ffffffff81a7ee70
[    0.027998] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff81aa4955
[    0.027998] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    0.027998] FS:  0000000000000000(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000
[    0.027998] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.027998] CR2: 0000000000000000 CR3: 0000000001a05000 CR4: 00000000000006f0
[    0.027998] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.027998] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    0.027998] Process swapper/0 (pid: 1, threadinfo ffff88000f8b8000, task ffff88000f8b0000)
[    0.027998] Stack:
[    0.027998]  0000000000000000 ffffffff81b1b550 ffff88000f8b9ef0 ffffffff81aa4989
[    0.027998]  0000000000000040 ffffffff81a800d8 ffff88000f8b9f20 ffffffff81b1b550
[    0.027998]  ffffffff81aa4955 0000000000000000 ffff88000f8b9f20 ffffffff810002ea
[    0.027998] Call Trace:
[    0.027998]  [<ffffffff81aa4989>] init_hw_perf_events+0x34/0x3ef
[    0.027998]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
[    0.027998]  [<ffffffff810002ea>] do_one_initcall+0x7a/0x12c
[    0.027998]  [<ffffffff81a9eb45>] kernel_init+0x7a/0x141
[    0.027998]  [<ffffffff814963b4>] kernel_thread_helper+0x4/0x10
[    0.027998]  [<ffffffff81a9eacb>] ? start_kernel+0x339/0x339
[    0.027998]  [<ffffffff814963b0>] ? gs_change+0xb/0xb
[    0.027998] Code: 48 d3 e0 48 ff c8 41 ff ca 48 89 05 b4 99 fd ff 7e 2b 83 e2 1f b8 03 00 00 00 83 fa 02 b9 45 03 00 00 0f 4f c2 89 05 91 99 fd ff <0f> 32 48 c1 e2 20 89 c0 48 09 c2 48 89 15 ef 99 fd ff e8 cf be 
[    0.027998] RIP  [<ffffffff81aa553f>] intel_pmu_init+0x283/0x85e
[    0.027998]  RSP <ffff88000f8b9ea0>
[    0.029015] ---[ end trace 4eaa2a86a8e2da22 ]---
[    0.030006] swapper/0 used greatest stack depth: 5576 bytes left
[    0.031005] Kernel panic - not syncing: Attempted to kill init!
[    0.032006] Pid: 1, comm: swapper/0 Tainted: G      D      3.2.12-gentoo #1
[    0.033000] Call Trace:
[    0.034003]  [<ffffffff8148d64e>] panic+0x8c/0x198
[    0.035005]  [<ffffffff8103e1f0>] do_exit+0x98/0x7d8
[    0.036005]  [<ffffffff8103c564>] ? kmsg_dump+0x46/0xd2
[    0.037007]  [<ffffffff81490078>] oops_end+0xb1/0xb9
[    0.038001]  [<ffffffff81004bd9>] die+0x55/0x60
[    0.039005]  [<ffffffff8148fd30>] do_general_protection+0x12e/0x136
[    0.040001]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
[    0.041005]  [<ffffffff8148f83f>] general_protection+0x1f/0x30
[    0.042001]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
[    0.043004]  [<ffffffff81aa553f>] ? intel_pmu_init+0x283/0x85e
[    0.044001]  [<ffffffff81aa4989>] init_hw_perf_events+0x34/0x3ef
[    0.045005]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
[    0.046003]  [<ffffffff810002ea>] do_one_initcall+0x7a/0x12c
[    0.047003]  [<ffffffff81a9eb45>] kernel_init+0x7a/0x141
[    0.048000]  [<ffffffff814963b4>] kernel_thread_helper+0x4/0x10
[    0.049000]  [<ffffffff81a9eacb>] ? start_kernel+0x339/0x339
[    0.050008]  [<ffffffff814963b0>] ? gs_change+0xb/0xb

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https://bugs.launchpad.net/bugs/1037675

Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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Re: [Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Gleb Natapov]

On Mon, Sep 10, 2012 at 10:23:26AM -0000, Till Schäfer wrote:
> [    0.027998] Process swapper/0 (pid: 1, threadinfo ffff88000f8b8000, task ffff88000f8b0000)
> [    0.027998] Stack:
> [    0.027998]  0000000000000000 ffffffff81b1b550 ffff88000f8b9ef0 ffffffff81aa4989
> [    0.027998]  0000000000000040 ffffffff81a800d8 ffff88000f8b9f20 ffffffff81b1b550
> [    0.027998]  ffffffff81aa4955 0000000000000000 ffff88000f8b9f20 ffffffff810002ea
> [    0.027998] Call Trace:
> [    0.027998]  [<ffffffff81aa4989>] init_hw_perf_events+0x34/0x3ef
> [    0.027998]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
> [    0.027998]  [<ffffffff810002ea>] do_one_initcall+0x7a/0x12c
> [    0.027998]  [<ffffffff81a9eb45>] kernel_init+0x7a/0x141
> [    0.027998]  [<ffffffff814963b4>] kernel_thread_helper+0x4/0x10
> [    0.027998]  [<ffffffff81a9eacb>] ? start_kernel+0x339/0x339
> [    0.027998]  [<ffffffff814963b0>] ? gs_change+0xb/0xb
> [    0.027998] Code: 48 d3 e0 48 ff c8 41 ff ca 48 89 05 b4 99 fd ff 7e 2b 83 e2 1f b8 03 00 00 00 83 fa 02 b9 45 03 00 00 0f 4f c2 89 05 91 99 fd ff <0f> 32 48 c1 e2 20 89 c0 48 09 c2 48 89 15 ef 99 fd ff e8 cf be 
> [    0.027998] RIP  [<ffffffff81aa553f>] intel_pmu_init+0x283/0x85e
> [    0.027998]  RSP <ffff88000f8b9ea0>
> [    0.029015] ---[ end trace 4eaa2a86a8e2da22 ]---
> [    0.030006] swapper/0 used greatest stack depth: 5576 bytes left
> [    0.031005] Kernel panic - not syncing: Attempted to kill init!
> [    0.032006] Pid: 1, comm: swapper/0 Tainted: G      D      3.2.12-gentoo #1
> [    0.033000] Call Trace:
> [    0.034003]  [<ffffffff8148d64e>] panic+0x8c/0x198
> [    0.035005]  [<ffffffff8103e1f0>] do_exit+0x98/0x7d8
> [    0.036005]  [<ffffffff8103c564>] ? kmsg_dump+0x46/0xd2
> [    0.037007]  [<ffffffff81490078>] oops_end+0xb1/0xb9
> [    0.038001]  [<ffffffff81004bd9>] die+0x55/0x60
> [    0.039005]  [<ffffffff8148fd30>] do_general_protection+0x12e/0x136
> [    0.040001]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
> [    0.041005]  [<ffffffff8148f83f>] general_protection+0x1f/0x30
Guest tries to use PMU MSR and gets #GP. I wonder which MSR it uses that
KVM does not emulate. Can you trace it like that: http://www.linux-kvm.org/page/Tracing

You can run qemu with -cpu host,level=9 to disable PMU emulation.

> [    0.042001]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
> [    0.043004]  [<ffffffff81aa553f>] ? intel_pmu_init+0x283/0x85e
> [    0.044001]  [<ffffffff81aa4989>] init_hw_perf_events+0x34/0x3ef
> [    0.045005]  [<ffffffff81aa4955>] ? check_bugs+0x2d/0x2d
> [    0.046003]  [<ffffffff810002ea>] do_one_initcall+0x7a/0x12c
> [    0.047003]  [<ffffffff81a9eb45>] kernel_init+0x7a/0x141
> [    0.048000]  [<ffffffff814963b4>] kernel_thread_helper+0x4/0x10
> [    0.049000]  [<ffffffff81a9eacb>] ? start_kernel+0x339/0x339
> [    0.050008]  [<ffffffff814963b0>] ? gs_change+0xb/0xb
> 

--
			Gleb.

[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

** Attachment added: "guest output of kernel panic (serial console output)"
   https://bugs.launchpad.net/qemu/+bug/1037675/+attachment/3305265/+files/serial_out.txt

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

i started trace-cmd as suggested on http://www.linux-
kvm.org/page/Tracing and started the vm. after the panic i aborted
trace-cmd and here is the trace file

** Attachment added: "trace from trace-cmd"
   https://bugs.launchpad.net/qemu/+bug/1037675/+attachment/3306241/+files/trace.dat.tar.bz2

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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Re: [Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Gleb Natapov]

On Mon, Sep 10, 2012 at 10:24:51PM -0000, Till Schäfer wrote:
> i started trace-cmd as suggested on http://www.linux-
> kvm.org/page/Tracing and started the vm. after the panic i aborted
> trace-cmd and here is the trace file
> 
> ** Attachment added: "trace from trace-cmd"
>    https://bugs.launchpad.net/qemu/+bug/1037675/+attachment/3306241/+files/trace.dat.tar.bz2
> 
Is you guest kernel compiled without paravirtualization enabled?

--
			Gleb.

[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

i forgot to mention that the PID was 27374

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Laurent COUSTET]

I had exactly the same problem using custom kernel on Debian GNU/Linux /
qemu-kvm 1.1.1 or 1.2.0.

CPU: Intel(R) Xeon(R) CPU E5-2667 0 @ 2.90GHz stepping 7 microcode 0x70b

I have two solutions: (VERY UGGLY) patch the kernel to remove intel perf
events (hardware events):

--- ../linux-3.4.10-fai-server/arch/x86/kernel/cpu/perf_event.c	2012-08-27 00:02:10.000000000 +0200
+++ arch/x86/kernel/cpu/perf_event.c	2012-09-10 18:56:11.870774243 +0200
@@ -1324,7 +1328,8 @@
 	struct event_constraint *c;
 	int err;
 
-	pr_info("Performance Events: ");
+	pr_info("Performance Events: (DISABLED BY UGGLY PATCH)");
+	return 0;
 
 	switch (boot_cpu_data.x86_vendor) {
 	case X86_VENDOR_INTEL:


*OR*

Add support for KVM Guest in the *GUEST* kernel config:


+CONFIG_KVM_CLOCK=y
+CONFIG_KVM_GUEST=y
+CONFIG_PARAVIRT=y
+# CONFIG_PARAVIRT_SPINLOCKS is not set
+CONFIG_PARAVIRT_CLOCK=y

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Till Schäfer]

changing the guest config to enable paravirt seems to do the trick!

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1037675

Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[James Le Cuirot]

I am seeing more or less the same thing. I am trying to boot Puppy Linux
from Gentoo with qemu-kvm-1.1.1-r3 and gentoo-sources-3.6.0.
Interestingly, I also found that AROS crashed when using "-cpu host" but
I initially chalked that up to AROS being flakey - perhaps not.
Obviously I can't enable those kernel options in AROS and I don't want
to have to build my own Puppy kernel.

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Anton Arapov]

You can pass the level=9 param to disable the PMU emulation, this should
fix your issue as well. ( e.g. -cpu host,level=9 )

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You received this bug notification because you are a member of qemu-
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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Thomas Huth]

Is there still something left to do here or can we close this bug
nowadays?

** Changed in: qemu
       Status: New => Incomplete

-- 
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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  Incomplete

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Thomas Huth]

** Bug watch removed: Gentoo Bugzilla #431640
   https://bugs.gentoo.org/show_bug.cgi?id=431640

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  Incomplete

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  Expired

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

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