kacpid dies on boot 2.4.0-prerelease

Attached is a ksymoops processed oops which kacpid creates as part of its initialization (i.e. at boot time). It was connected to AC power with a full battery, if that is significant.

Kernel is 2.4.0-prerelease. The machine is a IBM Thinkpad i1200 series (to be more specific model 1161-267), Coppermine Celeron CPU 550MHz, 64MB RAM, BIOS updated to 1.0R.

This machine works fine under APM except that it sucks as much power on suspend than when running (LCD and HD shut off, that's all). With ACPI I have the contrary problem that it goes into CPU powersave even when it should be running normally. The userspace bogomips program normally reports 546bm but only 64bm when running ACPI (and it is slow; kernel cpuinfo reports 1040bm in both cases, it is reduced in speed only after kernel did its own measurement). This could be related to the kacipd failure however.

 Andreas E. Bombe <[email protected]>    DSA key 0x04880A44
http://home.pages.de/~andreas.bombe/    http://linux1394.sourceforge.net/

ksymoops 2.3.4 on i686 2.4.0-prerelease-acpi. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.0-prerelease-acpi/ (default) -m /boot/System.map-2.4.0-prerelease-acpi (specified)

Unable to handle kernel NULL pointer dereference at virtual address 00000000
c01ac476
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<c01ac476>]

Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010206
eax: 0000a800 ebx: c3fa1ea4 ecx: 0000001e edx: c1123770
esi: 00000000 edi: c027e3fc ebp: c027e378 esp: c3fa1e84
ds: 0018 es: 0018 ss: 0018
Process kacpid (pid: 7, stackpage=c3fa1000)

Stack: c3f86360 c3fa1f1c c3fa1f78 c3f86360 c3f86360 c3fa1f1c c3fa1f78 c1123770 
       000000f0 c1123760 c01ac597 c3f86360 c027e378 c020ef80 00000000 c3f86360 
       c3fa1f1c c3fa1f78 00000006 30544142 00000009 30504e50 00413043 00000000 
Call Trace: [<c01ac597>] [<c020ef80>] [<c01988e1>] [<c01a6187>] [<c01a5a13>] [<c020ea58>] [<c01a61d7>] 
       [<c01a60e0>] [<c01ac494>] [<c020f30e>] [<c01ac96c>] [<c020f30e>] [<c01ac494>] [<c020ea58>] [<c020fc22>] 
       [<c01adaf8>] [<c020fc1c>] [<c01adb12>] [<c01ac12f>] [<c020eb82>] [<c0220018>] [<c01074c3>] [<c01074cc>] 
Code: ac aa 84 c0 75 f7 f3 aa 8b 43 04 50 e8 4d ab f7 ff 31 c0 83 

Trace; c01ac597 <acpi_found_cmbatt+103/16c> Trace; c020ef80 <_acpi_ctype+3700/6a45> Trace; c01988e1 <acpi_cm_execute_HID+75/80> Trace; c01a6187 <acpi_ns_get_device_callback+a7/b4> Trace; c01a5a13 <acpi_ns_walk_namespace+87/104> Trace; c020ea58 <_acpi_ctype+31d8/6a45> Trace; c01a61d7 <acpi_get_devices+43/6c> Trace; c01a60e0 <acpi_ns_get_device_callback+0/b4> Trace; c01ac494 <acpi_found_cmbatt+0/16c> Trace; c020f30e <_acpi_ctype+3a8e/6a45> Trace; c01ac96c <acpi_cmbatt_init+18/94> Trace; c020f30e <_acpi_ctype+3a8e/6a45> Trace; c01ac494 <acpi_found_cmbatt+0/16c> Trace; c020ea58 <_acpi_ctype+31d8/6a45> Trace; c020fc22 <_acpi_ctype+43a2/6a45> Trace; c01adaf8 <acpi_power_init+40/60> Trace; c020fc1c <_acpi_ctype+439c/6a45> Trace; c01adb12 <acpi_power_init+5a/60> Trace; c01ac12f <acpi_thread+eb/21c>
Trace; c020eb82 <_acpi_ctype+3302/6a45> Trace; c0220018 <__ksymtab_arp_broken_ops+0/8> Trace; c01074c3 <kernel_thread+1f/38> Trace; c01074cc <kernel_thread+28/38>
Code; c01ac476 <acpi_get_battery_info+14e/16c> 00000000 <_EIP>:
Code; c01ac476 <acpi_get_battery_info+14e/16c> <=====
0: ac lods %ds:(%esi),%al <=====
Code; c01ac477 <acpi_get_battery_info+14f/16c>
1: aa stos %al,%es:(%edi)
Code; c01ac478 <acpi_get_battery_info+150/16c>
2: 84 c0 test %al,%al
Code; c01ac47a <acpi_get_battery_info+152/16c>
4: 75 f7 jne fffffffd <_EIP+0xfffffffd> c01ac473 <acpi_get_battery_info+14b/16c>
Code; c01ac47c <acpi_get_battery_info+154/16c>
6: f3 aa repz stos %al,%es:(%edi)
Code; c01ac47e <acpi_get_battery_info+156/16c>
8: 8b 43 04 mov 0x4(%ebx),%eax
Code; c01ac481 <acpi_get_battery_info+159/16c>
b: 50 push %eax
Code; c01ac482 <acpi_get_battery_info+15a/16c>
c: e8 4d ab f7 ff call fff7ab5e <_EIP+0xfff7ab5e> c0126fd4 <kfree+0/b0>
Code; c01ac487 <acpi_get_battery_info+15f/16c>
11: 31 c0 xor %eax,%eax
Code; c01ac489 <acpi_get_battery_info+161/16c>
13: 83 00 00 addl $0x0,(%eax)