ksymoops 2.4.4 on i686 2.4.20-ac2.  Options used
     -v vmlinux (specified)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.4.20-ac2/ (default)
     -m /boot/System.map-2.4.20-ac2 (default)

Jan  6 01:13:04 twins kernel: kernel BUG at filemap.c:242!
Jan  6 01:13:04 twins kernel: invalid operand: 0000
Jan  6 01:13:04 twins kernel: CPU:    0
Jan  6 01:13:04 twins kernel: EIP:    0010:[<c01250ac>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
Jan  6 01:13:04 twins kernel: EFLAGS: 00010286
Jan  6 01:13:04 twins kernel: eax: c5563dd8   ebx: c10b2968   ecx: c10b2968   edx: c4b257e8
Jan  6 01:13:04 twins kernel: esi: c54be1a8   edi: 00000000   ebp: 00000000   esp: c5563d78
Jan  6 01:13:04 twins kernel: ds: 0018   es: 0018   ss: 0018
Jan  6 01:13:04 twins kernel: Process rrdtool (pid: 25745, stackpage=c5563000)
Jan  6 01:13:04 twins kernel: Stack: c10b2968 c012523a c10b2968 00000000 00000001 c5563dd8 00000000 40400000
Jan  6 01:13:04 twins kernel:        40016000 c3564404 c0e3a000 c1bc5874 00000000 00000081 c307b300 00000000
Jan  6 01:13:04 twins kernel:        c307b35c c01bfefb 40015000 00000000 c5563dd8 00000000 c54be1a8 c01252db
Jan  6 01:13:04 twins kernel: Call Trace:    [<c012523a>] [<c01bfefb>] [<c01252db>] [<c0123058>] [<c0147f64>]
Jan  6 01:13:04 twins kernel:   [<c015923b>] [<c0126d8b>] [<c0126db9>] [<c01480d4>] [<c0132ffd>] [<c0132d5c>]
Jan  6 01:13:04 twins kernel:   [<c01336b6>] [<c013eca4>] [<c0113111>] [<c01bfa0e>] [<c01344b4>] [<c01347e1>]
Jan  6 01:13:04 twins kernel:   [<c0106c8b>]
Jan  6 01:13:04 twins kernel: Code: 0f 0b f2 00 be a4 20 c0 8b 43 30 85 c0 74 0e 6a 00 53 e8 ad

>>EIP; c01250ac <truncate_complete_page+c/60>   <=====
Trace; c012523a <truncate_list_pages+13a/1a0>
Trace; c01bfefb <kfree_skbmem+b/60>
Trace; c01252db <truncate_inode_pages+3b/70>
Trace; c0123058 <vmtruncate+98/130>
Trace; c0147f64 <inode_setattr+24/d0>
Trace; c015923b <ext3_setattr+13b/180>
Trace; c0126d8b <filemap_nopage+bb/200>
Trace; c0126db9 <filemap_nopage+e9/200>
Trace; c01480d4 <notify_change+54/100>
Trace; c0132ffd <pte_chain_alloc+d/30>
Trace; c0132d5c <page_add_rmap+2c/80>
Trace; c01336b6 <do_truncate+46/60>
Trace; c013eca4 <open_namei+3d4/4f0>
Trace; c0113111 <__wake_up+41/60>
Trace; c01bfa0e <sock_def_write_space+2e/70>
Trace; c01344b4 <filp_open+34/60>
Trace; c01347e1 <sys_open+31/80>
Trace; c0106c8b <system_call+33/38>
Code;  c01250ac <truncate_complete_page+c/60>
00000000 <_EIP>:
Code;  c01250ac <truncate_complete_page+c/60>   <=====
   0:   0f 0b                     ud2a      <=====
Code;  c01250ae <truncate_complete_page+e/60>
   2:   f2 00 be a4 20 c0 8b      repnz add %bh,0x8bc020a4(%esi)
Code;  c01250b5 <truncate_complete_page+15/60>
   9:   43                        inc    %ebx
Code;  c01250b6 <truncate_complete_page+16/60>
   a:   30 85 c0 74 0e 6a         xor    %al,0x6a0e74c0(%ebp)
Code;  c01250bc <truncate_complete_page+1c/60>
  10:   00 53 e8                  add    %dl,0xffffffe8(%ebx)
Code;  c01250bf <truncate_complete_page+1f/60>
  13:   ad                        lods   %ds:(%esi),%eax