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SubjectLinux 2.4.21-pre3-ac3 oops with himem
I received the following oops while running the Cerberus stress test on 
2.4.21-pre3-ac3. The hardware is an ASUS A7N8X single AMD Athlon XP
motherboard with the Nvidia nforce2 chipset. The oops occurs as soon as
the system has used all the RAM and tries to use swap. The total amount
of memory on the machine is 1GB, and himem is enabled. If I turn off
himem support the kernel starts to use swap without oopsing. I can
provide my kernel .config or more hardware details if that would be useful.

Mike

ksymoops 2.4.4 on i686 2.4.21-pre3-ac2. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.21-pre3-ac2/ (default)
-m /boot/System.map-2.4.21-pre3-ac2 (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Unable to handle kernel NULL pointer dereference at virtual address 00000004
c01354e2
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c01354e2>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000 ebx: c197d960 ecx: f71da000 edx: f71da05c
esi: c197d960 edi: 00000000 ebp: 00003737 esp: f71dbdd0
ds: 0018 es: 0018 ss: 0018
Process cp (pid: 1690, stackpage=f71db000)
Stack: c01415f2 f7e84400 c197d960 000001d2 c013f67f 00000000 c197d960
00000000
c197d960 00000020 00003737 c0134ad7 00000004 f71da000 00000200
000001d2
c02fabe8 f71da000 00000000 00000000 00000000 00000020 000001d2
00000006
Call Trace: [<c01415f2>] [<c013f67f>] [<c0134ad7>] [<c0134c70>]
[<c0134cec>]
[<c01357d0>] [<c0135a8b>] [<c012d216>] [<c012d8f5>] [<c012dc5f>]
[<c0150a9c>]
[<c012e14a>] [<c012dfe0>] [<c013cf65>] [<c0108b33>]
Code: 89 58 04 89 03 89 53 04 89 59 5c 89 7b 0c ff 41 68 83 c4 1c

>>EIP; c01354e2 <__free_pages_ok+282/2a0> <=====
Trace; c01415f2 <try_to_free_buffers+d2/160>
Trace; c013f67f <try_to_release_page+2f/50>
Trace; c0134ad7 <shrink_cache+387/3b0>
Trace; c0134c70 <shrink_caches+50/90>
Trace; c0134cec <try_to_free_pages_zone+3c/60>
Trace; c01357d0 <balance_classzone+60/200>
Trace; c0135a8b <__alloc_pages+11b/170>
Trace; c012d216 <page_cache_read+76/d0>
Trace; c012d8f5 <generic_file_readahead+f5/130>
Trace; c012dc5f <do_generic_file_read+2ef/460>
Trace; c0150a9c <dput+1c/160>
Trace; c012e14a <generic_file_read+7a/110>
Trace; c012dfe0 <file_read_actor+0/f0>
Trace; c013cf65 <sys_read+95/110>
Trace; c0108b33 <system_call+33/38>
Code; c01354e2 <__free_pages_ok+282/2a0>
00000000 <_EIP>:
Code; c01354e2 <__free_pages_ok+282/2a0> <=====
0: 89 58 04 mov %ebx,0x4(%eax) <=====
Code; c01354e5 <__free_pages_ok+285/2a0>
3: 89 03 mov %eax,(%ebx)
Code; c01354e7 <__free_pages_ok+287/2a0>
5: 89 53 04 mov %edx,0x4(%ebx)
Code; c01354ea <__free_pages_ok+28a/2a0>
8: 89 59 5c mov %ebx,0x5c(%ecx)
Code; c01354ed <__free_pages_ok+28d/2a0>
b: 89 7b 0c mov %edi,0xc(%ebx)
Code; c01354f0 <__free_pages_ok+290/2a0>
e: ff 41 68 incl 0x68(%ecx)
Code; c01354f3 <__free_pages_ok+293/2a0>
11: 83 c4 1c add $0x1c,%esp


1 warning issued. Results may not be reliable.



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