Description of problem:
$dmesg
[...]
Lukewarm IQ detected in hotplug locking
BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug() (Tainted: P     )
 [<c04051ea>] show_trace_log_lvl+0x54/0xfd
 [<c04057a6>] show_trace+0xd/0x10
 [<c04058bf>] dump_stack+0x19/0x1b
 [<c043f23f>] lock_cpu_hotplug+0x49/0x6f
 [<c05a22f8>] __cpufreq_driver_target+0x15/0x6d
 [<c05a3258>] cpufreq_governor_userspace+0x199/0x1cc
 [<c05a1d9f>] __cpufreq_governor+0x57/0xd8
 [<c05a1fb7>] __cpufreq_set_policy+0x197/0x1a9
 [<c05a2165>] store_scaling_governor+0x12d/0x15b
 [<c05a17f0>] store+0x37/0x48
 [<c04a8cd4>] sysfs_write_file+0xab/0xd1
 [<c0471f33>] vfs_write+0xab/0x157
 [<c0472578>] sys_write+0x3b/0x60
 [<c0403faf>] syscall_call+0x7/0xb
Lukewarm IQ detected in hotplug locking
BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug() (Tainted: P     )
 [<c04051ea>] show_trace_log_lvl+0x54/0xfd
 [<c04057a6>] show_trace+0xd/0x10
 [<c04058bf>] dump_stack+0x19/0x1b
 [<c043f23f>] lock_cpu_hotplug+0x49/0x6f
 [<c05a22f8>] __cpufreq_driver_target+0x15/0x6d
 [<c05a3258>] cpufreq_governor_userspace+0x199/0x1cc
 [<c05a1d9f>] __cpufreq_governor+0x57/0xd8
 [<c05a1fb7>] __cpufreq_set_policy+0x197/0x1a9
 [<c05a2165>] store_scaling_governor+0x12d/0x15b
 [<c05a17f0>] store+0x37/0x48
 [<c04a8cd4>] sysfs_write_file+0xab/0xd1
 [<c0471f33>] vfs_write+0xab/0x157
 [<c0472578>] sys_write+0x3b/0x60
 [<c0403faf>] syscall_call+0x7/0xb


Version-Release number of selected component (if applicable):
2.6.17-1.2445.fc6

How reproducible:
always

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:
$ cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 43
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
stepping        : 1
cpu MHz         : 1000.000
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
]$ uname -a
Linux localhost.localdomain 2.6.17-1.2445.fc6 #1 SMP Mon Jul 24 22:43:31 EDT
2006 i686 athlon i386 GNU/Linux