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SubjectRe: Panic from 2.4.19-pre9-aa2
> not really sure what could be the problem, it would be interesting to
> see if you can reproduce it.

Yup, do 2 or 3 kernel compiles and it crashes again. Here's a slightly
different oops:

Unable to handle kernel NULL pointer dereference at virtual address 00000282
*pde = 00000000
Oops: 0000
CPU: 6
EIP: 0010:[<c0117feb>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010046
eax: c6369f6c ebx: 00000282 ecx: c029a488 edx: c4ff5b24
esi: c4ff5b20 edi: 00000282 ebp: c6227f70 esp: c6227f54
ds: 0018 es: 0018 ss: 0018
Process cpp (pid: 16679, stackpage=c6227000)
Stack: 00001000 c4ff5b20 c5773180 00000001 c4ff5b24 00000282 00000001 000526a9
c0148311 00000000 ffffffea c5eab160 000536a9 c6526000 c6226000 c57731ec
00001000 00001000 c013ead7 c5eab160 4011000c 000536a9 c5eab180 c6226000
Call Trace: [<c0148311>] [<c013ead7>] [<c0108a7b>]
Code: 8b 3b 0f 18 07 3b 5d f4 75 d0 c6 06 01 ff 75 f8 9d 8d 74 26

>>EIP; c0117fea <__wake_up+5a/7c> <=====
Trace; c0148310 <pipe_write+1bc/294>
Trace; c013ead6 <sys_write+8e/100>
Trace; c0108a7a <system_call+2e/34>
Code; c0117fea <__wake_up+5a/7c>
00000000 <_EIP>:
Code; c0117fea <__wake_up+5a/7c> <=====
0: 8b 3b mov (%ebx),%edi <=====
Code; c0117fec <__wake_up+5c/7c>
2: 0f 18 07 prefetchnta (%edi)
Code; c0117fee <__wake_up+5e/7c>
5: 3b 5d f4 cmp 0xfffffff4(%ebp),%ebx
Code; c0117ff2 <__wake_up+62/7c>
8: 75 d0 jne ffffffda <_EIP+0xffffffda> c0117fc4 <__
Code; c0117ff4 <__wake_up+64/7c>
a: c6 06 01 movb $0x1,(%esi)
Code; c0117ff6 <__wake_up+66/7c>
d: ff 75 f8 pushl 0xfffffff8(%ebp)
Code; c0117ffa <__wake_up+6a/7c>
10: 9d popf
Code; c0117ffa <__wake_up+6a/7c>
11: 8d 74 26 00 lea 0x0(%esi,1),%esi

> Also if for example you enabled numa-q you
> may want to try to disable it and see if w/o discontigmem the problem
> goes away, if we could isolate it to a config option, it would help a lot.

OK, will see if I can do that - I'm out for a few days, so it may be next
Tuesday before I can do this

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