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xen-devel
[Xen-devel] system freeze when processor.ko is loaded during boot
Hello,
I see a system freeze with xen-unstable and jeremy/xen/2.6.32-next
kernel when the processor ACPI mocule is loaded during boot on my
Samsung X50 notebook. I first saw this problem with Xen under OpenSUSE
11.3 (https://bugzilla.novell.com/show_bug.cgi?id=623680) with the
OpenSUSE hypervisor and kernel.
So far, I have found out the following:
- no problem with OpenSUSE default kernel
- no problem with Xen if I don't load processor.ko
- no problem with "max_cstate=1" hypervisor parameter (but max_cstate=2
freezes)
- when the freeze happens, I am usually seeing some unreleated messages
about USB or SATA device initialization. No keys at all are working,
sometimes the disk LED stays on without the disk making noises. I
haven't been able to see any hypervisor messages (even with "vga=keep";
unfortunately the system has no serial port). The Xen "watchdog"
parameter causes the machine to reboot without any messages.
- The weirdest thing is that once the system has booted, I seem to be
able to load processor.ko without problems (at least the system doesn't
freeze, even if I let it idle for a long time or if I do normal work
under X). With the SUSE hypervisor + kernel I was even able to verify
that cpuidle was working and C3 was being used (with xen-unstable, I
couldn't get xenpm to work so far).
- However if processor.ko is loaded during boot, the system always
freezes (100% reproducable). I tried loading it in the initrd (SUSE
default) and early after mounting the root FS (autoloaded by udev I
think), and even compiling it into the kernel proper (tried that only
with the jeremy kernel). In all cases, the system freezes hard.
Probably the freeze occurs when the CPU enters a deep C-state while some
HW initialization is going on at boot time.
I am a little out of clues how to debug this further, any hints would be
welcome.
The info below was taken with the normal OpenSUSE kernel.
Thanks for any hints
Martin
martin@athene:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 2.13GHz
stepping : 8
cpu MHz : 800.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe up bts est tm2
bogomips : 1596.03
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:
martin@athene:~$ cat /proc/acpi/processor/CPU0/info
processor id: 0
acpi id: 0
bus mastering control: yes
power management: yes
throttling control: yes
limit interface: yes
martin@athene:~$ cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C8
maximum allowed latency: 2000000000 usec
states:
C1: type[C1] promotion[--] demotion[--]
latency[001] usage[00001563] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--]
latency[001] usage[00308057] duration[00000000002512350868]
C3: type[C3] promotion[--] demotion[--]
latency[085] usage[00126109] duration[00000000000772728489]
C4: type[C3] promotion[--] demotion[--]
latency[185] usage[00537539] duration[00000000008753288513]
m
[ 3.345147] processor_driver-0392 [00] processor_get_info : Bus
mastering arbitration control present
[ 3.345187] processor_driver-0474 [00] processor_get_info :
Processor [0:0]
[ 3.345215] processor_throttling-1141 [00] processor_get_throttli:
pblk_address[0x00001010] duty_offset[3] duty_width[1]
[ 3.345233] processor_throttling-1187 [00] processor_get_throttli:
Found 2 throttling states
[ 3.345246] processor_throttling-0657 [00] processor_get_throttli:
Throttling state is T0 (1000% throttling applied)
[ 3.345585] processor_idle-0526 [00] processor_get_power_in: Found 4
power states
[ 3.345931] processor_throttling-0218 [00] processor_throttling_i:
Assume no T-state coordination
[ 82.129875] processor_perflib-0349 [00] processor_get_performa: Found
6 performance states
[ 82.129889] processor_perflib-0367 [00] processor_get_performa:
Extracting state 0
[ 82.129901] processor_perflib-0385 [00] processor_get_performa: State
[0]: core_frequency[2133] power[27000] transition_latency[10]
bus_master_latency[10] control[0x1029] status[0x1029]
[ 82.129918] processor_perflib-0367 [00] processor_get_performa:
Extracting state 1
[ 82.129928] processor_perflib-0385 [00] processor_get_performa: State
[1]: core_frequency[1867] power[24000] transition_latency[10]
bus_master_latency[10] control[0xe25] status[0xe25]
[ 82.129945] processor_perflib-0367 [00] processor_get_performa:
Extracting state 2
[ 82.129955] processor_perflib-0385 [00] processor_get_performa: State
[2]: core_frequency[1600] power[21000] transition_latency[10]
bus_master_latency[10] control[0xc20] status[0xc20]
[ 82.129972] processor_perflib-0367 [00] processor_get_performa:
Extracting state 3
[ 82.129982] processor_perflib-0385 [00] processor_get_performa: State
[3]: core_frequency[1333] power[19000] transition_latency[10]
bus_master_latency[10] control[0xa1c] status[0xa1c]
[ 82.129998] processor_perflib-0367 [00] processor_get_performa:
Extracting state 4
[ 82.130009] processor_perflib-0385 [00] processor_get_performa: State
[4]: core_frequency[1067] power[16000] transition_latency[10]
bus_master_latency[10] control[0x817] status[0x817]
[ 82.130025] processor_perflib-0367 [00] processor_get_performa:
Extracting state 5
[ 82.130035] processor_perflib-0385 [00] processor_get_performa: State
[5]: core_frequency[800] power[13000] transition_latency[10]
bus_master_latency[10] control[0x612] status[0x612]
[ 82.130173] processor_perflib-0486 [00] processor_notify_smm : No
SMI port or pstate_control
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