Description of problem:

While installing a rawhide/x86_64 kvm guest on a F-10/x86_64 host, my guest exhibits a call trace while starting the installer.

Version-Release number of selected component (if applicable):

 * libvirt-0.5.1-2.fc10.x86_64
 * kernel-2.6.27.9-159.fc10.x86_64
 * kvm-74-10.fc10.x86_64

How reproducible:


Steps to Reproduce:
1. Install F-10/x86_64
2. Run yum-update to get latest updates (at least libvirt-0.5.1-2.fc10.x86_64, kernel-2.6.27.9-159.fc10.x86_64)
3. Create a 1G KVM guest and install rawhide/x86_64 (see "Additional Info" for
more details on guest configuration)
  
Actual results:

      BUG: unable to handle kernel paging request at ffffc753f000f008
      IP: [<ffffffff810be806>] copy_page_range+0x311/0x7b5
      PGD 0
      Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
      last sysfs file: /sys/class/firmware/timeout
      CPU 0
      Modules linked in: jfs(+) reiserfs gfs2 msdos linear raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 8139cp 8139too mii iscsi_ibft iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ext2 ext4 jbd2 crc16 squashfs pcspkr edd floppy nfs lockd nfs_acl auth_rpcgss sunrpc vfat fat cramfs
      Pid: 674, comm: udevd Not tainted 2.6.29-0.43.rc2.git1.fc11.x86_64 #1
      RIP: 0010:[<ffffffff810be806>] [<ffffffff810be806>] copy_page_range+0x311/0x7b5
      RSP: 0018:ffff880038267c40 EFLAGS: 00010246
      RAX: ffffc753f000f008 RBX: 000000003824a000 RCX: 0000000000313000
      RDX: 0000000000000000 RSI: ffff880000000000 RDI: 000000003824b067
      RBP: ffff880038267d50 R08: ffff88003872ab70 R09: ffffffff810ba7db
      R10: ffff8800382627c0 R11: 0000000000000001 R12: ffff880038215940
      R13: 0000000000312000 R14: ffff8800382627c0 R15: ffff88003e6ab328
      FS: 00007ffadf3e3790(0000) GS:ffffffff81934000(0000) knlGS:0000000000000000
      CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      CR2: ffffc753f000f008 CR3: 00000000381e8000 CR4: 00000000000006e0
      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
      Process udevd (pid: 674, threadinfo ffff880038266000, task ffff88003872a350)
      Stack:
      ffff880038267c90 0000000000312fff ffff8800382627c0 ffff880038210540
      ffff880038215940 ffff8800381e8000 ffff88002dcae000 0000000000313000
      0000000000313000 ffff88003824a008 ffffc753f000f008 ffffffff810484fc
      Call Trace:
      [<ffffffff810484fc>] ? dup_mm+0x28e/0x3cc
      [<ffffffff8106ba34>] ? lock_release_holdtime+0x2c/0x123
      [<ffffffff81048538>] dup_mm+0x2ca/0x3cc
      [<ffffffff810491ec>] copy_process+0xb76/0x135c
      [<ffffffff8106ba34>] ? lock_release_holdtime+0x2c/0x123
      [<ffffffff81383cf5>] ? _spin_unlock_irqrestore+0x47/0x57
      [<ffffffff81049b32>] do_fork+0x160/0x31f
      [<ffffffff810e948e>] ? putname+0x30/0x39
      [<ffffffff81042c74>] ? default_wake_function+0x0/0xf
      [<ffffffff8101130a>] ? sysret_check+0x46/0x81
      [<ffffffff8100f62d>] sys_clone+0x23/0x25
      [<ffffffff810117c3>] stub_clone+0x13/0x20
      [<ffffffff810112ba>] ? system_call_fastpath+0x16/0x1b

      ┌──────┤ Would you like to use VNC? ├───────┐
      │                                           │
      │ The VNC mode installation offers more     │
      │ functionality than the text mode, would   │
      │ you like to use it instead?               │
      │                                           │
      │ ┌───────────────┐ ┌───────────┐           │
      │ │ Use text mode │ │ Start VNC │           │
      │ └───────────────┘ └───────────┘           │
      │                                           │
      │                                           │
      └───────────────────────────────────────────┘
      <Tab>/<Alt-Tab> between elements | <Space> selects | <F12> next screen

Expected results:

 * No kernel call trace


Additional info:

 * Installign F-10 guests does not exhibit this same call trace

 * My host is configured as follows
    # virsh nodeinfo
    CPU model:           x86_64
    CPU(s):              8
    CPU frequency:       2000 MHz
    CPU socket(s):       2
    Core(s) per socket:  4
    Thread(s) per core:  1
    NUMA cell(s):        1
    Memory size:         9229676 kB

 * My guest is configured as follows
    # virsh dominfo vguest1
    Id:             5
    Name:           vguest1
    UUID:           5ff59e32-d4c5-48ad-17e9-2898dd0df18f
    OS Type:        hvm
    State:          running
    CPU(s):         1
    CPU time:       646.7s
    Max memory:     1048576 kB
    Used memory:    1048576 kB
    Autostart:      disable