It is likely that guest stops to receive interrupt. I met this issue in
debuging
in kernel PIC patch. The normal reason is that a previous irq injection 
fails (IDT_Vectoring valid). It seems currnet KVM handling to
IDT_Vectoring 
doesn't cover all situation.
(The in Kernel PIC patch will try to cover this)

[EMAIL PROTECTED] wrote:
> Okay there's another centrino duo issue I've run across.
> 
> Also, finally got a setup where I can get console dumps from kvm :) so
> I should be able to provide much better debugging information.
> 
> This happens when I try to tftpboot from and etherboot image and
> install either fedora 7 or debian unstable but only on occasion.
> 
> === console dump ===
> CPU 0 irqstacks, hard=c076e000 soft=c074e000
> PID hash table entries: 2048 (order: 11, 8192 bytes)
> Detected 1197.321 MHz processor.
> Console: colour VGA+ 80x25
> Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
> Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
> Memory: 509396k/524224k available (2037k kernel code, 14284k
> reserved, 1069k dat a, 236k init, 0k highmem)
> virtual kernel memory layout:
>    fixmap  : 0xffc55000 - 0xfffff000   (3752 kB)
>    pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
>    vmalloc : 0xe0800000 - 0xff7fe000   ( 495 MB)
>    lowmem  : 0xc0000000 - 0xdfff0000   ( 511 MB)
>      .init : 0xc070e000 - 0xc0749000   ( 236 kB)
>      .data : 0xc05fd722 - 0xc0708cb4   (1069 kB)
>      .text : 0xc0400000 - 0xc05fd722   (2037 kB)
> Checking if this processor honours the WP bit even in
> supervisor mode... Ok.
> Calibrating delay using timer specific routine.. 2405.37
> BogoMIPS (lpj=1202687)
> Security Framework v1.0.0 initialized
> SELinux:  Initializing.
> selinux_register_security:  Registering secondary module capability
> Capability LSM initialized as secondary
> Mount-cache hash table entries: 512
> CPU: L1 I cache: 8K
> CPU: L2 cache: 128K
> Checking 'hlt' instruction... OK.
> SMP alternatives: switching to UP code
> Freeing SMP alternatives: 13k freed
> CPU0: Intel Pentium II (Klamath) stepping 03
> SMP motherboard not detected.
> Brought up 1 CPUs
> Time: 23:59:52  Date: 05/18/107
> NET: Registered protocol family 16
> PCI: PCI BIOS revision 2.10 entry at 0xfa130, last bus=0
> PCI: Using configuration type 1
> Setting up standard PCI resources
> ACPI: Interpreter disabled.
> Linux Plug and Play Support v0.97 (c) Adam Belay
> pnp: PnP ACPI: disabled
> usbcore: registered new interface driver usbfs
> usbcore: registered new interface driver hub
> usbcore: registered new device driver usb
> PCI: Probing PCI hardware
> * Found PM-Timer Bug on the chipset. Due to workarounds for a bug,
> * this clock source is slow. Consider trying other clock sources
> PCI quirk: region b000-b03f claimed by PIIX4 ACPI
> PCI quirk: region b100-b10f claimed by PIIX4 SMB
> PCI: Using IRQ router PIIX/ICH [8086/7000] at 0000:00:01.0
> NetLabel: Initializing
> NetLabel:  domain hash size = 128
> NetLabel:  protocols = UNLABELED CIPSOv4
> NetLabel:  unlabeled traffic allowed by default
> PCI: Ignore bogus resource 6 [0:0] of 0000:00:02.0
> NET: Registered protocol family 2
> ====
> 
> Then everything just stops and doesn't continue.
> 
> Here's the command line.
> kvm -no-rtc -boot d -cdrom /home/dmlb2000/Desktop/eb-5.4.3-rtl8139.iso
> -net nic,model=rtl8139 -net tap -m 512 /dev/vg0/extra -serial
> /dev/pts/2 The pts/2 is connected to an xterm.
> 
> Also it happens with both taskset 1 and without. Also this doesn't
> happen with -no-kvm. 
> 
> Not sure if this is an issue with qemu and the way pxelinux.0 loads
> the kernel or what... 
> 
> Thanks,
> - David Brown
> 
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