Got one of these while messing with some DVDs and CDs (mounting them,
etc.) One of them was not inside the drive correctly, so i had to eject
it while mount was running. Could this have happened then? I didn't look
at dmesg immediately after when that may have occurred.

kernel BUG at include/linux/list.h:148!
invalid operand: 0000 [#2]
PREEMPT 
CPU:    0
EIP:    0060:[<c016ae51>]    Not tainted VLI
EFLAGS: 00010202
EIP is at prune_dcache+0x1dc/0x1e9
eax: 00000000   ebx: cd4eab80   ecx: cd4eab94   edx: cd537e9c
esi: cd4eabf0   edi: c13b2000   ebp: 0000007e   esp: c13b3e7c
ds: 007b   es: 007b   ss: 0068
Process kswapd0 (pid: 8, threadinfo=c13b2000 task=c13b8d00)
Stack: cd567480 00000000 00000080 c13b2000 00000004 cffdeb20 c016b2e7 00000080 
       c01436c3 00000080 000000d0 0000de8b 001a673c 00000000 0000001e 00000000 
       000000f6 c035e874 00000001 ffffff85 c0144a88 000000f6 000000d0 000000d0 
Call Trace:
 [<c016b2e7>] shrink_dcache_memory+0x23/0x25
 [<c01436c3>] shrink_slab+0x110/0x153
 [<c0144a88>] balance_pgdat+0x1d6/0x1f0
 [<c0144bb4>] kswapd+0x112/0x122
 [<c011e113>] autoremove_wake_function+0x0/0x4f
 [<c03001c6>] ret_from_fork+0x6/0x14
 [<c011e113>] autoremove_wake_function+0x0/0x4f
 [<c0144aa2>] kswapd+0x0/0x122
 [<c0109255>] kernel_thread_helper+0x5/0xb

Code: 01 a8 08 75 12 8b 47 08 83 6f 14 01 a8 08 74 b0 e8 ca 1b fb ff eb a9 e8 c3 1b fb ff eb e7 0f 0b 95 00 9d 96 31 c0 e9 29 ff ff ff <0f> 0b 94 00 9d 96 31 c0 e9 10 ff ff ff 55 57 56 53 83 ec 0c 8b 
 <6>note: kswapd0[8] exited with preempt_count 2

-- 
Joshua Kwan