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Subjectkernel BUG at slab.c:1244! (and slab.c:580)
Hrm.  Third time I've reported this, it's happened since the early 2.4 
kernels and I can get at least one every day or so. The odd thing is
that the first oops normally happens within a couple hours after boot
but it may take weeks before another oops will happen. The oops always
has a trace similar to below. The second oops is new to me, it happened
last night and I haven't seen it before, culled from syslog.

# uname -r
2.4.5-ac15

invalid operand: 0000
CPU: 0
EIP: 0010:[<c0126223>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010082
eax: 0000001b ebx: c13bf768 ecx: c033e280 edx: 0000285e
esi: cca5d000 edi: 00001000 ebp: 00000246 esp: c9df3de8
ds: 0018 es: 0018 ss: 0018
Process postmaster (pid: 17971, stackpage=c9df3000)
Stack: c02be985 000004dc ca20e604 c03cffc0 00000007 00000002 00001000
cca5d000
c025ad46 00000dbc 00000007 cae69820 00000000 c9df2000 c025a560
00000d80
00000007 c9df3e98 00000d66 cae68834 ca6dfe94 c02a909a cae69820
00000d66
Call Trace: [<c025ad46>] [<c025a560>] [<c02a909a>] [<c0258424>]
[<c025907e>]
[<c01109f8>] [<c0110b5b>] [<c01109f8>] [<c0121e49>] [<c02590b5>]
[<c025980b>]

[<c0107a6d>] [<c0106ac7>]
Code: 0f 0b 83 c4 08 f6 43 11 04 74 55 b8 a5 c2 0f 17 87 46 00 3d

>>EIP; c0126223 <kmalloc+123/1bc> <=====
Trace; c025ad46 <alloc_skb+da/18c>
Trace; c025a560 <sock_alloc_send_skb+64/e8>
Trace; c02a909a <unix_stream_sendmsg+102/2ec>
Trace; c0258424 <sock_sendmsg+68/88>
Trace; c025907e <sys_sendto+c6/e4>
Trace; c01109f8 <do_page_fault+0/454>
Trace; c0110b5b <do_page_fault+163/454>
Trace; c01109f8 <do_page_fault+0/454>
Trace; c0121e49 <generic_file_read+61/7c>
Trace; c02590b5 <sys_send+19/20>
Trace; c025980b <sys_socketcall+103/1bc>
Trace; c0107a6d <math_state_restore+19/34>
Trace; c0106ac7 <system_call+37/40>
Code; c0126223 <kmalloc+123/1bc>
00000000 <_EIP>:
Code; c0126223 <kmalloc+123/1bc> <=====
0: 0f 0b ud2a <=====
Code; c0126225 <kmalloc+125/1bc>
2: 83 c4 08 add $0x8,%esp
Code; c0126228 <kmalloc+128/1bc>
5: f6 43 11 04 testb $0x4,0x11(%ebx)
Code; c012622c <kmalloc+12c/1bc>
9: 74 55 je 60 <_EIP+0x60> c0126283
<kmalloc+183/1bc>
Code; c012622e <kmalloc+12e/1bc>
b: b8 a5 c2 0f 17 mov $0x170fc2a5,%eax
Code; c0126233 <kmalloc+133/1bc>
10: 87 46 00 xchg %eax,0x0(%esi)
Code; c0126236 <kmalloc+136/1bc>
13: 3d 00 00 00 00 cmp $0x0,%eax

kernel BUG at slab.c:580!
invalid operand: 0000
CPU: 0
EIP: 0010:[vmfree_area_pages+239/396]
EFLAGS: 00010286
eax: 0000001a ebx: c13bf768 ecx: c033e280 edx: 00002950
esi: 00000000 edi: 00001000 ebp: c880b44c esp: cdf67f78
ds: 0018 es: 0018 ss: 0018
Process kswapd (pid: 3, stackpage=cdf67000)
Stack: c02be985 00000244 00000000 00000001 00000000 c13bf768 00001000
c5a5c000
c0126965 c13bf768 c880b44c 00000004 0000019b cdf66239 0008e000
c13bf6ec
c03ad22c 00000000 00000001 00000001 c01284e8 00000004 cdf66000
c02bf1b1
Call Trace: [kmalloc+145/448] [page_launder+812/2012]
[page_launder+903/2012] [flush_thread+8/64]
Code: 0f 0b 83 c4 08 46 3b 73 14 0f 82 1a ff ff ff 8b 45 08 8b 75

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 0f 0b ud2a
Code; 00000002 Before first symbol
2: 83 c4 08 add $0x8,%esp
Code; 00000005 Before first symbol
5: 46 inc %esi
Code; 00000006 Before first symbol
6: 3b 73 14 cmp 0x14(%ebx),%esi
Code; 00000009 Before first symbol
9: 0f 82 1a ff ff ff jb ffffff29 <_EIP+0xffffff29>
ffffff29 <END_OF_CODE+3fc11c55/????>
Code; 0000000f Before first symbol
f: 8b 45 08 mov 0x8(%ebp),%eax
Code; 00000012 Before first symbol
12: 8b 75 00 mov 0x0(%ebp),%esi


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