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Subject[2.5.53 - Oops] CPU Frequency scaling
Date
Hello,

I'm playing around with 2.5.53 on my machine, and activating :
CPU Frequency scaling
Intel Pentium 4 clock modulation

results in a oops at boot time.

Details :
- Motherboard is P4S8X, 512 MB Ram, P4 2.4 Ghz
(if you need more details, please ask)
- Kernel : plain 2.5.53, no patch.
Do you need a copy of the .config ?

Oops, from a serial console on the machine :

cpufreq: P4/Xeon(TM) CPU On-Demand Clock Modulation available
divide error: 0000
CPU: 0
EIP: 0060:[<c0114879>] Not tainted
EFLAGS: 00010246
eax: 0024f9b6 ebx: 0024f9b6 ecx: 00005ea8 edx: 00000000
esi: 51eb851f edi: 00000000 ebp: dff8ff2c esp: dff8fec4
ds: 0068 es: 0068 ss: 0068
Process swapper (pid: 1, threadinfo=dff8e000 task=dff8c080)
Stack: 00000000 00000001 c04b9774 dff8ff2c 00000000 0000019a c01252b3
c04b9774
00000000 dff8ff2c 00000000 dff8ff2c 00000000 c012cbdb c0559474
00000000
dff8ff2c 00000000 00000008 00000000 0000019a c0114331 dff8ff2c
00000000
Call Trace: [<c01252b3>] [<c012cbdb>] [<c0114331>] [<c01144a5>]
[<c012cabc>]
[<c012cd26>] [<c0105058>] [<c010502e>] [<c0108b9d>]
Code: f7 f7 0f af d1 89 c3 89 54 24 04 89 d0 0f af d9 31 d2 8b 0d
<0>Kernel panic: Attempted to kill init!


ksymoops decoding, after reboot in a 2.4.20 :

4 [12:07] rol@donald:~> more oops-cpufreq.decode
ksymoops 2.4.8 on i686 2.4.20. Options used
-v /kernels/linux-2.5.53/vmlinux (specified)
-K (specified)
-l /proc/modules (default)
-o /lib/modules/2.4.20/ (default)
-m /boot/System.map-2.5.53 (specified)

No modules in ksyms, skipping objects
No ksyms, skipping lsmod
CPU: 0
EIP: 0060:[<c0114879>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 0024f9b6 ebx: 0024f9b6 ecx: 00005ea8 edx: 00000000
esi: 51eb851f edi: 00000000 ebp: dff8ff2c esp: dff8fec4
ds: 0068 es: 0068 ss: 0068
Stack: 00000000 00000001 c04b9774 dff8ff2c 00000000 0000019a c01252b3
c04b9774
00000000 dff8ff2c 00000000 dff8ff2c 00000000 c012cbdb c0559474
00000000
dff8ff2c 00000000 00000008 00000000 0000019a c0114331 dff8ff2c
00000000
Call Trace: [<c01252b3>] [<c012cbdb>] [<c0114331>] [<c01144a5>]
[<c012cabc>]
[<c012cd26>] [<c0105058>] [<c010502e>] [<c0108b9d>]
Code: f7 f7 0f af d1 89 c3 89 54 24 04 89 d0 0f af d9 31 d2 8b 0d


>>EIP; c0114879 <time_cpufreq_notifier+14f/208> <=====

Trace; c01252b3 <notifier_call_chain+27/3e>
Trace; c012cbdb <cpufreq_notify_transition+d9/12e>
Trace; c0114331 <cpufreq_p4_setdc+a1/1a0>
Trace; c01144a5 <cpufreq_p4_setpolicy+75/c6>
Trace; c012cabc <cpufreq_set_policy+178/1be>
Trace; c012cd26 <cpufreq_register+f6/14a>
Trace; c0105058 <init+2a/142>
Trace; c010502e <init+0/142>
Trace; c0108b9d <kernel_thread_helper+5/c>

Code; c0114879 <time_cpufreq_notifier+14f/208>
00000000 <_EIP>:
Code; c0114879 <time_cpufreq_notifier+14f/208> <=====
0: f7 f7 div %edi <=====
Code; c011487b <time_cpufreq_notifier+151/208>
2: 0f af d1 imul %ecx,%edx
Code; c011487e <time_cpufreq_notifier+154/208>
5: 89 c3 mov %eax,%ebx
Code; c0114880 <time_cpufreq_notifier+156/208>
7: 89 54 24 04 mov %edx,0x4(%esp,1)
Code; c0114884 <time_cpufreq_notifier+15a/208>
b: 89 d0 mov %edx,%eax
Code; c0114886 <time_cpufreq_notifier+15c/208>
d: 0f af d9 imul %ecx,%ebx
Code; c0114889 <time_cpufreq_notifier+15f/208>
10: 31 d2 xor %edx,%edx
Code; c011488b <time_cpufreq_notifier+161/208>
12: 8b 0d 00 00 00 00 mov 0x0,%ecx

<0>Kernel panic: Attempted to kill init!

If you need more info, if there is a standard bug report form,
please tell !

Paul Rolland, rol@as2917.net

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