Bug 550236

Description of problem:
Can not suspend guest to disk. Guest resumes automatically.
Note this malfunction exists only in guest with kernel-2.6.18-183.el5 
and will not happen in guest with kernel-2.6.18-164.9.1.el5. 

Version-Release number of selected component (if applicable):
2.6.18-182.el5
kvm-83-139.el5

How reproducible:
100%

Steps to Reproduce:
1.boot the guest by:
/usr/libexec/qemu-kvm -m 4096 -smp 2 -drive file=test.qcow2,if=ide,cache=off,boot=on -net nic,model=e1000,vlan=0,macaddr=DE:AD:BE:EF:53:70 -net tap,vlan=0,script=/etc/qemu-ifup -boot c -uuid 683005b1-285c-47ef-9d73-bf1102598caf -usbdevice tablet -no-hpet -rtc-td-hack -no-kvm-pit-reinjection -monitor stdio -notify all -cpu qemu64,+sse2 -balloon none
2.#cat /sys/power/state
which returns "mem disk"
3.#echo disk > /sys/power/state
4.after about 120 secs, guest resumes automatically.
  
Actual results:
Guest can not be suspended, will resume in about 120 secs.

Expected results:
After step 3, guest is suspended. Use the same qemu-kvm command in step 1 to restore the guest.

Additional info:
[Host info]
#uname -a
Linux khong-RHEL5.redhat.com 2.6.18-182.el5 #1 SMP Tue Dec 15 21:28:29 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

#rpm -qa | grep kvm
etherboot-zroms-kvm-5.4.4-13.el5
kvm-83-139.el5
kmod-kvm-83-139.el5
kvm-tools-83-139.el5
kvm-qemu-img-83-139.el5
kvm-debuginfo-83-139.el5

#cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 16
model           : 2
model name      : AMD Phenom(tm) 9600B Quad-Core Processor
stepping        : 3
cpu MHz         : 1200.000
cache size      : 512 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc nonstop_tsc pni cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy altmovcr8 abm sse4a misalignsse 3dnowprefetch osvw
bogomips        : 4587.48
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate [8]

processor       : 1
vendor_id       : AuthenticAMD
...

processor       : 2
vendor_id       : AuthenticAMD
...

processor       : 3
vendor_id       : AuthenticAMD
...

[Guest info]
#uname -a
Linux dhcp-66-70-197.nay.redhat.com 2.6.18-183.el5 #1 SMP Mon Dec 21 18:38:15 EST 2009 i686 athlon i386 GNU/Linux

#dmesg
Disabling non-boot CPUs ...
Breaking affinity for irq 1
Breaking affinity for irq 10
Breaking affinity for irq 11
Breaking affinity for irq 15
CPU 1 is now offline
SMP alternatives: switching to UP code
CPU1 is down
Stopping tasks: =====================================================================================================================================================
 stopping tasks timed out after 120 seconds (1 tasks remaining):
  khungtaskd
Restarting tasks...<6> Strange, khungtaskd not stopped
 done
Enabling non-boot CPUs ...
SMP alternatives: switching to SMP code
Booting processor 1/1 eip 11000
CPU 1 irqstacks, hard=c0769000 soft=c0749000
Initializing CPU#1
Calibrating delay using timer specific routine.. 4583.17 BogoMIPS (lpj=2291585)
CPU: After generic identify, caps: 078bfbfd 2191abfd 00000000 00000000 80000001 00000000 00000000
CPU: After vendor identify, caps: 078bfbfd 2191abfd 00000000 00000000 80000001 00000000 00000000
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU: After all inits, caps: 078bf3fd 2191abfd 00000000 01000420 80000001 00000000 00000000
kvm-clock: cpu 1, msr 0:3018a25, boot clock
register_clocksource: Cannot register kvm-clock. Already registered!<6>Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: AMD QEMU Virtual CPU version 0.9.1 stepping 03
kvm-clock: cpu 1, msr 0:3018a25, secondary cpu clock
kvm-clock: cpu 1, msr 0:3018a25, secondary cpu clock
CPU1 is up

#cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 6
model name      : QEMU Virtual CPU version 0.9.1
stepping        : 3
cpu MHz         : 2293.744
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 4
wp              : yes
flags           : fpu de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm nonstop_tsc pni
bogomips        : 4587.48

processor       : 1
vendor_id       : AuthenticAMD
...