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[fedora-virt] Kernel Bug in Guests

I'm getting errors dumped to console for guests.  The guests are
Centos 5.4 i386 and x86_64 guests running at the same time.  I've
configured each with 2048MB RAM and 2 processors.  One is set for i686
and the other for x86_64.  The host is a Phenon II X4 810 with 8GB of
RAM.   Both guests are running at the same time, but aren't doing much
of anything.


Smolt Profile.

Does anyone have a suggestion?

Here's the output for x86_64 guest.
BUG: soft lockup - CPU#0 stuck for 33s! [swapper:0]
CPU 0:
Modules linked in: ipv6 xfrm_nalgo crypto_api autofs4 hidp rfcomm
l2cap bluetooth lockd sunrpc dm_mirror dm_multipath scsi_dh video
hwmon backlight sbs i2c_ec button battery asus_acpi acpi_memhotplug ac
parport_pc lp parport floppy snd_ens1370 gameport snd_rawmidi
snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
snd_pcm_oss snd_mixer_oss snd_pcm virtio_pci snd_timer
snd_ak4531_codec snd i2c_piix4 8139too soundcore virtio_ring 8139cp
pcspkr i2c_core mii snd_page_alloc virtio serio_raw ide_cd cdrom
dm_raid45 dm_message dm_region_hash dm_log dm_mod dm_mem_cache
ata_piix libata sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 0, comm: swapper Not tainted 2.6.18-164.6.1.el5 #1
RIP: 0010:[<ffffffff80012322>]  [<ffffffff80012322>] __do_softirq+0x51/0x133
RSP: 0018:ffffffff8043df60  EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000002 RCX: ffffffff803f3ee8
RDX: ffffffff803f3fd8 RSI: 0000000000000000 RDI: ffffffff80300ae0
RBP: ffffffff8043dee0 R08: 0000000000000001 R09: ffff810081f42000
R10: ffffffff8043df98 R11: ffff810071f61c90 R12: ffffffff8005dc8e
R13: 0000000000000046 R14: ffffffff80077874 R15: ffffffff8043dee0
FS:  00002b05242956e0(0000) GS:ffffffff803c1000(0000) knlGS:00000000f7f2f6c0
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00002b64e73143a0 CR3: 00000000725cf000 CR4: 00000000000006e0

Call Trace:
 <IRQ>  [<ffffffff8005e2fc>] call_softirq+0x1c/0x28
 [<ffffffff8006cb20>] do_softirq+0x2c/0x85
 [<ffffffff8006b2d8>] default_idle+0x0/0x50
 [<ffffffff8005dc8e>] apic_timer_interrupt+0x66/0x6c
 <EOI>  [<ffffffff8006b301>] default_idle+0x29/0x50
 [<ffffffff8004938f>] cpu_idle+0x95/0xb8
 [<ffffffff803fd7fd>] start_kernel+0x220/0x225
 [<ffffffff803fd22f>] _sinittext+0x22f/0x236

Here's the output for i686.

BUG: soft lockup - CPU#0 stuck for 10s! [swapper:0]

Pid: 0, comm:              swapper
EIP: 0060:[<c044d721>] CPU: 0
EIP is at handle_IRQ_event+0x39/0x8c
 EFLAGS: 00000246    Tainted: G S     (2.6.18-164.el5 #1)
EAX: 0000000e EBX: c06f3580 ECX: f7cb8b00 EDX: c0741fb4
ESI: f7cb8b00 EDI: 0000000e EBP: 00000000 DS: 007b ES: 007b
CR0: 8005003b CR2: 001ee8a0 CR3: 355fb000 CR4: 000006d0
 [<c044d7f8>] __do_IRQ+0x84/0xd6
 [<c044d774>] __do_IRQ+0x0/0xd6
 [<c04074b2>] do_IRQ+0x99/0xc3
 [<c0405946>] common_interrupt+0x1a/0x20
 [<c0428e9b>] __do_softirq+0x57/0x114
 [<c04073cf>] do_softirq+0x52/0x9c
 [<c04059d7>] apic_timer_interrupt+0x1f/0x24
 [<c0403bb0>] default_idle+0x0/0x59
 [<c0403be1>] default_idle+0x31/0x59
 [<c0403ca8>] cpu_idle+0x9f/0xb9
 [<c07019f0>] start_kernel+0x37b/0x383

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