I recently experienced my first real kernel panic. It happened on a
heavily loaded web server while a spam-provider was bombarding it with
SMTP connection attempts. Since the SMTP port of this server is shielded
by the TCP wrappers, this caused "tcpd" to be invoked very often within
a short amount of time.
The server is a 486 PC equipped with an Adaptec 1542C ISA SCSI
controller and a 3COM Etherlink III Combo 3C509B ISA network card; the
kernel version is 2.0.34. The kernel panic seems not to have done any
harm; in fact, without having been rebooted the computer is running
smoothly like before. It is now up for nearly two years without any
problem, lest any similar one.
The generated messages look as follows:
Sep 8 23:15:02 ts12 kernel: Unable to handle kernel NULL pointer
dereference at virtual address c0000008
Sep 8 23:15:03 ts12 kernel: current->tss.cr3 = 0120e000, hr3 = 0120e000
Sep 8 23:15:03 ts12 kernel: *pde = 00102067
Sep 8 23:15:03 ts12 kernel: *pte = 00000000
Sep 8 23:15:03 ts12 kernel: Oops: 0000
Sep 8 23:15:03 ts12 kernel: CPU: 0
Sep 8 23:15:03 ts12 kernel: EIP: 0010:[memcpy_toiovec+82/144]
Sep 8 23:15:03 ts12 kernel: EFLAGS: 00010216
Sep 8 23:15:03 ts12 kernel: eax: 00000400 ebx: 0000018c ecx:
00000063 edx: bfffe888
Sep 8 23:15:03 ts12 kernel: esi: 00000008 edi: bfffe888 ebp:
011c1edc esp: 011c1e28
Sep 8 23:15:03 ts12 kernel: ds: 0018 es: 002b fs: 002b gs: 002b
ss: 0018
Sep 8 23:15:03 ts12 kernel: Process tcpd (pid: 7104, process nr: 188,
stackpage=011c1000)
Sep 8 23:15:03 ts12 kernel: Stack: 00120018 0000018c 011c1ee4 00624810
011c1f64 0000018c 0013c07b 011c1edc
Sep 8 23:15:03 ts12 kernel: 00000008 0000018c 0014f6e1 0034a9e0
00000008 011c1edc 0000018c 00624810
Sep 8 23:15:03 ts12 kernel: 011c1ed8 00000000 00000000 0034a9e0
00000004 00153ee6 00624810 011c1f64
Sep 8 23:15:03 ts12 kernel: Call Trace: [alloc_area_pages+424/608]
[skb_copy_datagram_iovec+27/32] [udp_recvmsg+113/192]
[inet_recvmsg+118/144] [sys_recvfrom+327/400] [udp_sendmsg+52/224]
[sys_socket+185/256]
Sep 8 23:15:03 ts12 kernel: [sys_send+245/272]
[sys_socketcall+643/848] [system_call+85/128]
Sep 8 23:15:03 ts12 kernel: Code: f3 a5 83 e3 03 89 d9 f3 a4 07 8b 5c
24 10 01 5c 24 1c 29 5c
Greetings,
Christian
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