I am running into a system freeze after entering oprofile --start. I do not see any kernel oops message on the console.  This is under Fedora Core 9 with oprofile built as a module.  When I increased the count, it took slightly more time before the system locked up.

 

cat ~/.oprofile/daemonrc

SESSION_DIR=/var/lib/oprofile

CHOSEN_EVENTS_0=CPU_CLK_UNHALTED:10000000:0:1:1

NR_CHOSEN=1

SEPARATE_LIB=0

SEPARATE_KERNEL=0

SEPARATE_THREAD=0

SEPARATE_CPU=0

VMLINUX=/usr/src/redhat/BUILD/kernel-2.6.27/linux-2.6.27.i686/vmlinux

IMAGE_FILTER=

CPU_BUF_SIZE=0

CALLGRAPH=0

KERNEL_RANGE=c0401000,c064afc8

XENIMAGE=none

 

uname -a

Linux physim11 2.6.27.25-78.2.56.local.fc9.i686 #1 SMP Mon Nov 5 14:56:10 PST 2012 i686 i686 i386 GNU/Linux

 

cat /proc/cpuinfo

processor       : 0

vendor_id       : GenuineIntel

cpu family      : 6

model           : 26

model name      : Intel(R) Xeon(R) CPU           W3550  @ 3.07GHz

stepping        : 5

cpu MHz         : 3066.773

cache size      : 8192 KB

physical id     : 1

siblings        : 8

core id         : 0

cpu cores       : 4

apicid          : 16

initial apicid  : 16

fdiv_bug        : no

hlt_bug         : no

f00f_bug        : no

coma_bug        : no

fpu             : yes

fpu_exception   : yes

cpuid level     : 11

wp              : yes

flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 sse4_2 popcnt lahf_lm ida

bogomips        : 6133.54

clflush size    : 64

power management:

 

Anybody have any suggestions?