[Bug 36222] New: kvm: 100% CPU usage after 3.0.0-rc1 guest shutdown

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=36222

           Summary: kvm: 100% CPU usage after 3.0.0-rc1 guest shutdown
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.0.0-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
        ReportedBy: edwintorok@gmail.com
        Regression: Yes


Created an attachment (id=60022)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=60022)
config-3.0.0-rc1

Host is 3.0.0-rc1, guest is 3.0.0-rc1.
After shutting down the guest, KVM on the host uses 100% CPU. 
gdb shows for KVM:
  6 Thread 0x7f00d1875700 (LWP 32105)  0x0000003e278ce2f7 in ioctl () at
../sysdeps/unix/syscall-template.S:82
  5 Thread 0x7f00d1074700 (LWP 32106)  0x0000003e278ce2f7 in ioctl () at
../sysdeps/unix/syscall-template.S:82
  4 Thread 0x7f00d0873700 (LWP 32107)  0x0000003e278ce2f7 in ioctl () at
../sysdeps/unix/syscall-template.S:82
  3 Thread 0x7f00d0072700 (LWP 32108)  0x0000003e278ce2f7 in ioctl () at
../sysdeps/unix/syscall-template.S:82
  2 Thread 0x7f00cf871700 (LWP 32109)  0x0000003e278ce2f7 in ioctl () at
../sysdeps/unix/syscall-template.S:82
* 1 Thread 0x7f00d1e95760 (LWP 32100)  0x0000003e278ceda3 in select () at
../sysdeps/unix/syscall-template.S:82

This seems to be a problem with the 3.0.0-rc1 guest, because if I boot 2.6.39
in the guest (still keeping same 3.0.0-rc1 running on the host), then shutdown
completes normally, no 100% CPU usage loop.

.config for KVM guest attached.
KVM command-line (created by libvirt):
/usr/bin/kvm -S -M pc-0.14 -cpu
phenom,+wdt,+skinit,+osvw,+3dnowprefetch,+misalignsse,+sse4a,+abm,+cr8legacy,+extapic,+cmp_legacy,+lahf_lm,+rdtscp,+pdpe1gb,+popcnt,+cx16,+ht,+vme
-enable-nesting -enable-kvm -m 3072 -smp 5,sockets=5,cores=1,threads=1 -name
debian-enc -uuid 55782a0a-937c-fa7b-8db5-86876d151a08 -nodefconfig -nodefaults
-chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/debian-enc.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot
order=c,menu=off -drive
file=/var/lib/libvirt/images/debian-enc.img,if=none,id=drive-virtio-disk0,boot=on,format=raw
-device
virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0
-drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device
ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev
tap,fd=18,id=hostnet0,vhost=on,vhostfd=19 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:52:de:54,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-usb -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -vga cirrus -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6

Bisecting...

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