mwavem crashes on Thinkpad 600E when trying to dial

Binary package hint: mwavem

I have problems with the ACP Modem (mwave) in an old ThinkPad 600E.

I don't know if this is a problem with my specific hardware setup or if it really is a bug in the mwavem package itself, so I'm reporting it here just to let the maintainers know.

The mwave module loads fine. The mwavem daemon (2.0-2) starts successfully, too.

However, I am unable to make any calls to an internet provider. Every time the modem tries to dial
a number, the mwavem process crashes. On the other hand, the modem replies to simple commands like ATZ
or ATI3, so the general (serial) setup seems to be ok.

When I start mwavem manually (not using /etc/init.d/mwavem) to better see the error messages, all looks well:

   root@grandl:~# /usr/sbin/mwavem /etc/mwavem/mwavem.conf
   Initializing mwave manager...
   Initializing modem specific code...
   Got configured startup speed: 64000...

   Checking configured speed...
   Setting modem speed...
   Loading modem DSP...
   mwave modem, STARTED...

In another terminal, I can now use minicom to successfully talk to the modem...

   Welcome to minicom 2.2

   OPTIONS: I18n
   Compiled on Mar 7 2007, 15:10:03.
   Port /dev/ttyS1

                  Press CTRL-A Z for help on special keys

   AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
   OK
   ati3
   ThinkPad Modem v4.0
   OK
   atz
   OK

... until I try for example

   atdt1234

which immediately leads to

   Segmentation fault (core dumped)

on my first terminal.

(With some tracing enabled via mwavem.conf, the last lines read:

    mwmload::mwmLoadDialToModem entry
    mwmpool::mwmPoolAllocateCoreChunk entry
    mwmpool::mwmPoolTransferControlBlock entry
    mwmpool::mwmPoolTransferControlBlock exit
    mwmcntnd::mwmCntndAllocSegment entry
    mwmcntnd::mwmCntndAllocSegment exit
    mwmpool::mwmPoolTransferControlBlock entry
    mwmpool::mwmPoolTransferControlBlock exit
    mwmpool::mwmPoolTransferControlBlock entry
    mwmpool::mwmPoolTransferControlBlock exit
    mwmpool::mwmPoolTransferControlBlock entry
    mwmpool::mwmPoolTransferControlBlock exit
    mwmpool::mwmPoolAllocateCoreChunk exit
    mwmload::mwmLoadDialToModem ulFeaturesToLoad 1912d4ea hmodV34 0
    mwmload::mwmLoadV34 entry

    Segmentation fault (core dumped)

Looks like mwavem dies when loading something like /usr/share/mwavem/v34.dsp into memory.)

Things I tried so far:

  - checked for hardware conflicts using the bios configuration utility ps2.exe
  - tried a non-default hardware (irq etc.) setup for serial-a and modem (IR port is disabled)
  - excluded irq 3 and 10 in /etc/pcmcia/config.opts, so the pcmcia handler does not touch them
  - disabled all sound related modules
  - compiled and tried my own "ACP Modem (Mwave) Driver for Linux" (mwavem-2.0.tar.gz) from Sourgeforge
    without luck.

I'm running the latest firmware available (INET36WW = 1.16, 11/20/99) and feisty (7.04). My boot options include "acpi=off pci=noacpi pnpbios=off vga=0x317".

Regards
   Heinz