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Subject2.5.34-mm2 kernel BUG at sched.c:944! only with CONFIG_PREEMPT=y
I got the following BUG at sched.c:944! with 2.5.34-mm2 and PREEMPT on.
This was repeatable.

With no PREEMPT, 2.5.34-mm2 booted and is running fine. Some other

System is dual p3, scsi, 1GB.


ksymoops 2.4.4 on i686 2.5.34. Options used
-v vmlinux (specified)
-K (specified)
-L (specified)
-O (specified)
-m (specified)

kernel BUG at sched.c:944!
invalid operand: 0000
CPU: 0
EIP: 0060:[<c01176ff>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010206
eax: c02d4000 ebx: c02d4000 ecx: 00000000 edx: 00000000
esi: 0009b800 edi: c0105000 ebp: c02d5c8 esp: c02d5fa8
ds: 068 es: 0068 ss: 0068
Stack: c01072c4 00000060 00000286 00000000 00000000 c02d4000 0009b800 c0105000
c02d5fd4 c0117ad6 00000000 0008e000 c010504b c02d68c2 c02ba3a0 00000000
c027e980 0003fff0 0003fff0 c033e660 00000002 c01001b1
Call Trace: [<c01072c4>] [<c0105000>] [<c0117ad6>] [<c010504b>]
Code: 0f 0b b0 03 5f 52 28 c0 b9 00 e0 ff ff 21 e1 ff 41 10 9b 01

>>EIP; c01176ff <schedule+1f/3c0> <=====
Trace; c01072c4 <kernel_thread_helper+0/c>
Trace; c0105000 <_stext+0/0>
Trace; c0117ad6 <preempt_schedule+36/50>
Trace; c010504b <rest_init+4b/50>
Code; c01176ff <schedule+1f/3c0>
00000000 <_EIP>:
Code; c01176ff <schedule+1f/3c0> <=====
0: 0f 0b ud2a <=====
Code; c0117701 <schedule+21/3c0>
2: b0 03 mov $0x3,%al
Code; c0117703 <schedule+23/3c0>
4: 5f pop %edi
Code; c0117704 <schedule+24/3c0>
5: 52 push %edx
Code; c0117705 <schedule+25/3c0>
6: 28 c0 sub %al,%al
Code; c0117707 <schedule+27/3c0>
8: b9 00 e0 ff ff mov $0xffffe000,%ecx
Code; c011770c <schedule+2c/3c0>
d: 21 e1 and %esp,%ecx
Code; c011770e <schedule+2e/3c0>
f: ff 41 10 incl 0x10(%ecx)
Code; c0117711 <schedule+31/3c0>
12: 9b fwait
Code; c0117712 <schedule+32/3c0>
13: 01 00 add %eax,(%eax)

<0>Kernel panic: Attempted to kill the idle task!

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