[Bug 120751] New: Host kernel freezes when I shutdown guest

[Bug 120751] New: Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

            Bug ID: 120751
           Summary: Host kernel freezes when I shutdown guest
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.6.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: mkletzan@redhat.com
        Regression: No

I wasn't able to find the smallest case that would cause this, so I'll describe
the whole procedure how to reproduce this.  I'll then try to narrow down the
cause.  If there is some information I might gather anywhere, I'll be more than
happy to provide such information.

Reproducible: always

Steps:
 1) I start a guest, switch to text console and login.
 2) Then in the host I run:
    a) 'virsh dompmsuspend $guest mem' which tells the guest's qemu-ga to
suspend to RAM.
    b) I then run 'virsh dompmwakeup $guest' to wake it up.  The guest console
misbehaves at this point (which is what I am trying to reproduce to solve
another bug).
 3) So I connect using ssh and run 'shutdown -h now'.

Actual results:
At that point last fraction of the second of the music I was playing (whatever
remained in the buffer, I guess) starts repeating and the host stops
responding.  Even Magic SysRq doesn't work.  I have to manually force the host
off with a button and boot again.

Expected results:
Host keeps running.

I've first seen that in 4.6.2, I tried 4.6.0 and it happened as well.  I'm not
sure whether this is related to Virtualization or graphics drivers or anything
else.

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

--- Comment #1 from Martin Kletzander <mkletzan@redhat.com> ---
$ uname -a
Linux wheatley 4.6.2 #1 SMP PREEMPT Tue Jun 21 13:50:41 CEST 2016 x86_64
Intel(R) Core(TM) i7-4900MQ CPU @ 2.80GHz GenuineIntel GNU/Linux

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

--- Comment #2 from Martin Kletzander <mkletzan@redhat.com> ---
Created attachment 220841
  --> https://bugzilla.kernel.org/attachment.cgi?id=220841&action=edit
kernel config

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

--- Comment #3 from Martin Kletzander <mkletzan@redhat.com> ---
Another reboot and I can confirm that the PM suspend is not needed.  Starting a
guest and then running 'shutdown -h now' through ssh is enough.

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

--- Comment #4 from Martin Kletzander <mkletzan@redhat.com> ---
Created attachment 220851
  --> https://bugzilla.kernel.org/attachment.cgi?id=220851&action=edit
Domain XML

Domain XML added in case someone asks although it probably doesn't have
anything in common with the issue.  QEMU command line looks like this (in case
that helps):

/usr/bin/qemu-system-x86_64 -name guest=rhel7,debug-threads=on -S -object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-rhel7/master-key.aes
-machine pc-i440fx-1.7,accel=kvm,usb=off,dump-guest-core=off -cpu SandyBridge
-m 4096 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -numa
node,nodeid=0,cpus=0,cpus=2,mem=2048 -numa node,nodeid=1,cpus=1,cpus=3,mem=2048
-uuid f49fa544-f21d-4267-8958-d82570644f39 -no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-1-rhel7/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive
if=none,id=drive-ide0-0-0,readonly=on -device
ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive
file=/var/lib/libvirt/images/rhel7.img,format=qcow2,if=none,id=drive-virtio-disk0
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=25,id=hostnet0,vhost=on,vhostfd=27 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:42:be:45,bus=pci.0,addr=0x3
-netdev tap,fd=28,id=hostnet1 -device
rtl8139,netdev=hostnet1,id=net1,mac=52:54:00:42:be:55,bus=pci.0,addr=0x7
-chardev spicevmc,id=charchannel0,name=vdagent -device
virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-chardev
socket,id=charchannel1,path=/var/lib/libvirt/qemu/channel/target/domain-1-rhel7/org.qemu.guest_agent.0,server,nowait
-device
virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0
-device usb-tablet,id=input0 -vnc
unix:/var/lib/libvirt/qemu/domain-1-rhel7/vnc.sock -spice
port=5901,tls-port=5902,addr=127.0.0.1,disable-ticketing,x509-dir=/etc/pki/libvirt-spice,seamless-migration=on
-device
qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=8,max_outputs=1,bus=pci.0,addr=0x2
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -device pvpanic -msg
timestamp=on

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[Bug 120751] Host kernel freezes when I shutdown guest

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https://bugzilla.kernel.org/show_bug.cgi?id=120751

Martin Kletzander <mkletzan@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|4.6.2                       |4.6.0 through 4.6.2

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

--- Comment #5 from Martin Kletzander <mkletzan@redhat.com> ---
Created attachment 221001
  --> https://bugzilla.kernel.org/attachment.cgi?id=221001&action=edit
stacktrace photo

I managed to get a shot of the stacktrace but it's missing all modules loaded. 
I can reproduce it if the list and it's proof is needed.

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[Bug 120751] Host kernel freezes when I shutdown guest

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120751

Martin Kletzander <mkletzan@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #6 from Martin Kletzander <mkletzan@redhat.com> ---
Sorry for the noise, I've found smaller reproducer and since that doesn't
involve virtualization (as it is related to networking), I'll post that into
separate bug so that others don't need to read through irrelevant information.

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