[ltp] pppd dies after connect (kernel NULL ptr deref)

[otisg]

Hello,

I've got RedHat 9 (2.4.20-8 kernel) on a ThinkPad T40.
I am trying to get the internal modem to work.  It is a Wintel
modem (Agere), but Agere and/or IBM provide the driver for it,
which I have installed.
(http://www-306.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-52698)

The machine identifies the modem and is able to connect to my
ISP, start pppd, but the connection is only half-made - no DHCP
information is set and, more importantly, I get the following
error.

I am wondering if anyone has seen this error or can decypher
its
meaning:

Jan 25 22:19:48 localhost ifup-ppp: pppd started for ppp0 on
/dev/modem at 57600
Jan 25 22:19:48 localhost pppd[12185]: pppd 2.4.1 started by
root, uid 0
Jan 25 22:19:49 localhost wvdial[12200]: WvDial: Internet
dialer
version 1.53
Jan 25 22:19:49 localhost wvdial[12200]: Initializing modem.
Jan 25 22:19:49 localhost wvdial[12200]: Sending: ATZ
Jan 25 22:19:49 localhost wvdial[12200]: ATZ
Jan 25 22:19:49 localhost wvdial[12200]: OK
Jan 25 22:19:49 localhost wvdial[12200]: Sending: ATM2
Jan 25 22:19:50 localhost wvdial[12200]: ATM2
Jan 25 22:19:50 localhost wvdial[12200]: OK
Jan 25 22:19:50 localhost wvdial[12200]: Modem initialized.
Jan 25 22:19:50 localhost wvdial[12200]: Sending: ATDT077600000
Jan 25 22:19:50 localhost wvdial[12200]: Waiting for carrier.
Jan 25 22:19:50 localhost wvdial[12200]: ATDT077600000
Jan 25 22:20:15 localhost wvdial[12200]: CONNECT 52000 V42bis
Jan 25 22:20:15 localhost wvdial[12200]:  HiNet, HT d.d.
Jan 25 22:20:15 localhost wvdial[12200]: User Access
Verification
Jan 25 22:20:15 localhost wvdial[12200]: Username:
Jan 25 22:20:15 localhost wvdial[12200]: Carrier detected. 
Chatmode finished.
Jan 25 22:20:15 localhost pppd[12185]: Serial connection
established.
Jan 25 22:20:15 localhost kernel:  <1>Unable to handle kernel
NULL pointer dereference at virtual address 00000300
Jan 25 22:20:15 localhost kernel:  printing eip:
Jan 25 22:20:15 localhost kernel: c012b535
Jan 25 22:20:15 localhost kernel: *pde = 00000000
Jan 25 22:20:15 localhost kernel: Oops: 0002
Jan 25 22:20:15 localhost kernel: ppp_deflate zlib_deflate
ppp_generic slhc agrserial agrmodem nls_iso8859-1 nls_cp437
radeon ds yenta_socket pcmcia_core sg sr_mod ipt_LOG ip_nat_ftp
iptable_n
Jan 25 22:20:15 localhost kernel: CPU:    0
Jan 25 22:20:15 localhost pppd[12185]: Couldn't set tty to PPP
discipline: Invalid argument
Jan 25 22:20:15 localhost kernel: EIP:    0060:[<c012b535>]   
Tainted: PF
Jan 25 22:20:15 localhost kernel: EFLAGS: 00010282
Jan 25 22:20:15 localhost kernel:
Jan 25 22:20:15 localhost kernel: EIP is at use_init_fs_context
[kernel] 0x15 (2.4.20-8)
Jan 25 22:20:15 localhost kernel: eax: 00000300   ebx: c012b150 
 ecx:eb54a110   edx: eb54a050
Jan 25 22:20:15 localhost kernel: esi: eb54a000   edi: 00000000 
 ebp:00000000   esp: eb54bf7c
Jan 25 22:20:15 localhost kernel: ds: 0068   es: 0068   ss:
0068
Jan 25 22:20:15 localhost kernel: Process pppd (pid: 12219,
stackpage=eb54b000)
Jan 25 22:20:15 localhost kernel: Stack: eb54a000 c012b150
eb54a000f8aece58 c012b150 eb54a000 00000000 00000000
Jan 25 22:20:15 localhost kernel:        c012b055 00000001
000000014027fb80 c012b150 eabadee4 c012b1a7 c030c2c0
Jan 25 22:20:15 localhost kernel:        eb54bfc8 c030c3c0
c012b150c030c2c0 c025dca2 c025dca5 c02691c4 eabadee4
Jan 25 22:20:15 localhost kernel: Call Trace:   [<c012b150>]
exec_modprobe [kernel] 0x0 (0xeb54bf80))
Jan 25 22:20:15 localhost kernel: [<c012b150>] exec_modprobe
[kernel]0x0 (0xeb54bf8c))
Jan 25 22:20:15 localhost kernel: [<c012b055>]
exec_usermodehelper[kernel] 0x25 (0xeb54bf9c))
Jan 25 22:20:15 localhost kernel: [<c012b150>] exec_modprobe
[kernel]0x0 (0xeb54bfac))
Jan 25 22:20:15 localhost kernel: [<c012b1a7>] exec_modprobe
[kernel]0x57 (0xeb54bfb4))
Jan 25 22:20:15 localhost kernel: [<c012b150>] exec_modprobe
[kernel]0x0 (0xeb54bfc4))
Jan 25 22:20:15 localhost kernel: [<c012b150>] exec_modprobe
[kernel]0x0 (0xeb54bfe8))
Jan 25 22:20:15 localhost kernel: [<c010742d>]
kernel_thread_helper[kernel] 0x5 (0xeb54bff0))
Jan 25 22:20:15 localhost kernel:
Jan 25 22:20:15 localhost kernel:
Jan 25 22:20:15 localhost kernel: Code: ff 00 ba 00 e0 ff ff 21
e2 8bb2 48 06 00 00 89 82 48 06 00
Jan 25 22:20:16 localhost pppd[12185]: Exit.


I have used both wvdial and kppp apps to dial, and the problem
is the same.

Any help would be much appreciated.

Thanks!
Otis


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