I compiled 2.4.4-ac4 with gcc-2.95.3. No problems with previous versions
until today. Here is the output of the kenerl panic from ksymoops:
EIP: c0247cfa <acpi_get_timer+e/2c>
Trace: c025602e <bm_initialize+56/278>
Trace: c02567a5 <bm_osl_init+79/8c>
Trace: c0105058 <init+58/1d0>
Trace: c0105594 <kernel thread+28/38>
Code; c0247cfa <acpi_get_timer+e/2c>
00000000 <_EIP>:
Code: c0247cfa <acpi_get_timer+e/2c>
0: 8b 80 d4 00 00 00 mov, 0xd4(%eax), %eax
Code: c0247d00 <acpi_get_timer+14/2c>
6: 50 push %eax
Code: c0247d01 <acpi_get_timer+15/2c>
7: e8 4a 77 ff ff call ffff7756 <_EIP+0xffff7756>
c023f450 <acpi_os_in_32+0/8>
Code: c0247d06 <acpi_get_timer+1a/2c>
c: 89 03 mov %eax, (%ebx)
Code: c0247d08 <acpi_get_timer +1c/2c>
e: 31 c0 xor %eax, %eax
Code: c0247d0a <acpi_get_timer+1e/2c>
10: 83 c4 04 add $0x4, %esp
Code: c0247d0d <acpi_get_timer+21/2c>
13: eb 00 jmp 15 <_EIP+0x15> c0247d0f
<acpi_get_timer+23/2c>
acpi_get_timer is in drivers/acpi/hardware/hwtimer
It makes a call to acpi_os_in32
acpi_os_in32 is in drivers/acpi/os.c
This takes the argument of an ACPI_IO_ADDRESS for a port number. What is
given as arguments in acpi_get_timer is
acpi_os_in32((ACPI_IO_ADDRESS) ACPI_GET_ADDRESS
(acpi_gbl_FADT->Xpm_tmr_blk.address));
ACPI_IO_ADDRESS is a cast
ACPI_GET_ADDRESS is a converter from 32 or 64 bit addresses to 16 bit
addresses if necessary. On this system it should not do anything.
acpi_gbl+FADT is a FADT_DESCRIPTOR_REV2 (a struct).
Looking at FADT_DESCRIPTOR_REV2's definition I fail to see where the
pointer is referring to in the struct. There is no element named
Xpm_tmr_blk)
---------------
The message that I received at the top of the oops was:
unable to handle NULL pointer dereference at virutal address 0000 00d4
---------------
System:
Dual P3@450Mhz, 392 MB Ram
Supermicro P6DBE motherboard
ACPI Disabled during first boot - got oops
ACPI Enabled during second boot - got same oops
ACPI settings:
all except for battery.
Stephen
-----------------------------------------------
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