modem, pppd, kernel EIP NULL ptr deref , RH9

Discussion in 'Linux Networking' started by OtisUsenet, Jan 27, 2004.

  1. OtisUsenet

    OtisUsenet Guest

    Hello,

    I've got RedHat 9 (2.4.20-8 kernel) on a ThinkPad T40.
    I am trying to get the modem to work. It is a Wintel modem (Agere),
    but Agere and/or IBM provide the driver for it, which I have
    installed.

    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 eb54a000
    f8aece58 c012b150 eb54a000 00000000 00000000
    Jan 25 22:20:15 localhost kernel: c012b055 00000001 00000001
    4027fb80 c012b150 eabadee4 c012b1a7 c030c2c0
    Jan 25 22:20:15 localhost kernel: eb54bfc8 c030c3c0 c012b150
    c030c2c0 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 8b
    b2 48 06 00 00 89 82 48 06 00
    Jan 25 22:20:16 localhost pppd[12185]: Exit.

    Any help would be much appreciated.

    Thanks!
     
    OtisUsenet, Jan 27, 2004
    #1
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