Oops while playing with raid

Pavel Machek (pavel@bug.ucw.cz)
Sat, 5 Dec 1998 11:56:45 +0100


I was playing with raid5 & nbd (it works fine, BTW, as long as you
keep servers on other machine than clients, otherwise you get deadlock
pretty soon).

While trying to ckraid, however, I got following (pretty ugly) oops:

pavel@bug:/usr/src/linux$ ksymoops System.map
Using `System.map' to map addresses to symbols.

Unable to handle kernel NULL pointer dereference at virtual address
current->tss.cr3 = 014e2000, %cr3 = 014e2000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c0124fc0>]
EFLAGS: 00010202
eax: 0000001a ebx: c1631f40 ecx: c1631f40 edx: 00000010
esi: 00000000 edi: c1631f14 ebp: c1631ee4 esp: c1631d24
ds: 0018 es: 0018 ss: 0018
Process ckraid (pid: 185, process nr: 31, stackpage=c1631000)
Stack: c1631f14 c01251c7 c1631f40 c1631f40 00000000 c1631f40 c0128430
c1007f20 ffffffea 0804f350 00020000 00000000 c1bdd4a0 c1a0b9c0
00000000 00000246 00014c00 00002b00 000001d4 00000000 00000000
Call Trace: [<c01251c7>] [<c0128430>] [<c01c5605>] [<c019c08c>]
[<c015a7a6>] [<c015a854>] [<c0110803>]
[<c0110b3f>] [<c012323a>] [<c0108944>]
Code: 89 50 38 8b 53 38 8b 03 89 02 c7 43 38 00 00 00 00 8b 53 3c
>>EIP: c0124fc0 <refile_buffer+d8/2bc>
Trace: c01251c7 <__brelse+23/44>
Trace: c0128430 <block_read+4d4/524>
Trace: c01c5605 <vgacon_scroll+235/258>
Trace: c019c08c <scrup+74/11c>
Trace: c015a7a6 <kfree_skbmem+32/44>
Trace: c015a854 <__kfree_skb+9c/a4>
Trace: c0110803 <update_process_times+5f/68>
Trace: c0110b3f <timer_bh+333/348>
Trace: c012323a <sys_read+c6/118>
Trace: c0108944 <system_call+34/40>

Code: c0124fc0 <refile_buffer+d8/2bc>


I'm really pavel@atrey.karlin.mff.cuni.cz. 	   Pavel
Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).

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