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SubjectPROBLEM: Athlon/VIA/2.4.4 kernel NULL pointer dereference.
May  5 10:29:24 pollux kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000014

Thereafter, almost nothing on the system worked.

This was within minutes of booting, and thus isn't the result of
long-term corruption.

The system is an Athlon on an Epox 8KTA3 (=VIA), with BIOS flashed up to
17-Apr-2001.

The kernel is 2.4.4, compiled as a PIII (since I still can't get an
Athlon kernel to boot on this machine.)

The ksymoops is attached (to prevent wraps).

=====
% cat /proc/version
Linux version 2.4.4 (root@pollux.dioscuri) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release)) #4 Sat Apr 28 19:54:44 GMT-6 2001

=====
% cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 4
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 1202.769
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips : 2398.61

=====
% cat /proc/pci

PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev
3).
Master Capable. Latency=8.
Prefetchable 32 bit memory at 0xd0000000 [0xd3ffffff].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP]
(rev 0).
Master Capable. No bursts. Min Gnt=12.
Bus 0, device 7, function 0:
ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South]
(rev 64).
Bus 0, device 7, function 1:
IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 6).
Master Capable. Latency=32.
I/O at 0xc000 [0xc00f].
Bus 0, device 7, function 4:
Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev
64).
Bus 0, device 10, function 0:
Unknown mass storage controller: Promise Technology, Inc. 20267 (rev
2).
IRQ 11.
Master Capable. Latency=32.
I/O at 0xd400 [0xd407].
I/O at 0xd800 [0xd803].
I/O at 0xcc00 [0xcc07].
I/O at 0xd000 [0xd003].
I/O at 0xdc00 [0xdc3f].
Non-prefetchable 32 bit memory at 0xda000000 [0xda01ffff].
Bus 0, device 11, function 0:
Serial controller: US Robotics/3Com 56K FaxModem Model 5610 (rev 1).

IRQ 5.
I/O at 0xe000 [0xe007].
Bus 0, device 12, function 0:
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 (rev
16).
IRQ 11.
Master Capable. Latency=32. Min Gnt=32.Max Lat=64.
I/O at 0xe400 [0xe4ff].
Non-prefetchable 32 bit memory at 0xda020000 [0xda0200ff].
Bus 1, device 0, function 0:
VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev
130).
IRQ 10.
Master Capable. Latency=64. Min Gnt=16.Max Lat=32.
Prefetchable 32 bit memory at 0xd4000000 [0xd5ffffff].
Non-prefetchable 32 bit memory at 0xd6000000 [0xd6003fff].
Non-prefetchable 32 bit memory at 0xd7000000 [0xd77fffff].

=====

Bobby Bryant
Austin, Texas

ksymoops 2.4.0 on i686 2.4.4. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.4/ (default)
-m /boot/System.map (specified)

Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(shmem_file_setup) not found in System.map. Ignoring ksyms_base entry
May 5 10:29:24 pollux kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000014
May 5 10:29:24 pollux kernel: c014b9ca
May 5 10:29:24 pollux kernel: *pde = 00000000
May 5 10:29:24 pollux kernel: Oops: 0000
May 5 10:29:24 pollux kernel: CPU: 0
May 5 10:29:24 pollux kernel: EIP: 0010:[ext2_new_block+158/2072]
May 5 10:29:24 pollux kernel: EIP: 0010:[<c014b9ca>]
Using defaults from ksymoops -t elf32-i386 -a i386
May 5 10:29:24 pollux kernel: EFLAGS: 00010216
May 5 10:29:24 pollux kernel: eax: 00000000 ebx: ef204400 ecx: e9299a00 edx: e9e5fd9c
May 5 10:29:24 pollux kernel: esi: efd71a00 edi: 0000ccd9 ebp: 00000000 esp: e9e5fd38
May 5 10:29:24 pollux kernel: ds: 0018 es: 0018 ss: 0018
May 5 10:29:24 pollux kernel: Process netscape-commun (pid: 1260, stackpage=e9e5f000)
May 5 10:29:24 pollux kernel: Stack: e9299a00 00040000 e9e5fe14 00000000 00000000 00000000 efd71a00 00000014
May 5 10:29:24 pollux kernel: c014d789 ea2d69c0 00000000 e9e5fddc e9e5fee8 ea2d69c0 00000000 00000000
May 5 10:29:24 pollux kernel: 00000000 e9e5fdc0 00000001 e9e5fdac ef204400 03030000 e9e5fda8 e9e5fddc
May 5 10:29:24 pollux kernel: Call Trace: [ext2_get_block+45/1300] [ext2_alloc_block+116/124] [ext2_alloc_branch+50/612] [ext2_getblk+111/288] [ext2_get_block+0/1300] [ext2_get_block+820/1300] [ext2_get_block+0/1300]
May 5 10:29:24 pollux kernel: Call Trace: [<c014d789>] [<c014d3dc>] [<c014d52a>] [<c014dcdf>] [<c014d75c>] [<c014da90>] [<c014d75c>]
May 5 10:29:24 pollux kernel: [<c0120c80>] [<c01313e8>] [<c0131721>] [<c0131ed2>] [<c014d75c>] [<c014dee5>] [<c014d75c>] [<c0125928>]
May 5 10:29:24 pollux kernel: [<c012f316>] [<c0106ae7>]
May 5 10:29:24 pollux kernel: Code: 8b 68 14 89 54 24 2c 39 6c 24 70 72 09 8b 5c 24 70 3b 58 04

>>EIP; c014b9ca <ext2_new_block+9e/818> <=====
Trace; c014d789 <ext2_get_block+2d/514>
Trace; c014d3dc <ext2_alloc_block+74/7c>
Trace; c014d52a <ext2_alloc_branch+32/264>
Trace; c014dcdf <ext2_getblk+6f/120>
Trace; c014d75c <ext2_get_block+0/514>
Trace; c014da90 <ext2_get_block+334/514>
Trace; c014d75c <ext2_get_block+0/514>
Trace; c0120c80 <do_anonymous_page+34/90>
Trace; c01313e8 <create_empty_buffers+18/6c>
Trace; c0131721 <__block_prepare_write+fd/248>
Trace; c0131ed2 <block_prepare_write+22/3c>
Trace; c014d75c <ext2_get_block+0/514>
Trace; c014dee5 <ext2_prepare_write+19/20>
Trace; c014d75c <ext2_get_block+0/514>
Trace; c0125928 <generic_file_write+424/5bc>
Trace; c012f316 <sys_write+92/c8>
Trace; c0106ae7 <system_call+33/38>
Code; c014b9ca <ext2_new_block+9e/818>
00000000 <_EIP>:
Code; c014b9ca <ext2_new_block+9e/818> <=====
0: 8b 68 14 mov 0x14(%eax),%ebp <=====
Code; c014b9cd <ext2_new_block+a1/818>
3: 89 54 24 2c mov %edx,0x2c(%esp,1)
Code; c014b9d1 <ext2_new_block+a5/818>
7: 39 6c 24 70 cmp %ebp,0x70(%esp,1)
Code; c014b9d5 <ext2_new_block+a9/818>
b: 72 09 jb 16 <_EIP+0x16> c014b9e0 <ext2_new_block+b4/818>
Code; c014b9d7 <ext2_new_block+ab/818>
d: 8b 5c 24 70 mov 0x70(%esp,1),%ebx
Code; c014b9db <ext2_new_block+af/818>
11: 3b 58 04 cmp 0x4(%eax),%ebx


1 warning issued. Results may not be reliable.
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