and of usb_modeswitch skript was
exec 1<&- 2<&- 5<&- 7<&-
(
        . /lib/udev/hotplug.functions
        wait_for_file /usr/sbin/usb_modeswitch_dispatcher
        exec usb_modeswitch_dispatcher --switch-mode $1 $0 >>/dev/null 2>&1 &
        exit 0
) &
exit 0

became:
exec 1<&- 2<&- 5<&- 7<&-
(
        . /lib/udev/hotplug.functions
        wait_for_file /usr/sbin/usb_modeswitch_dispatcher
        exec ltrace /usr/sbin/usb_modeswitch_dispatcher --switch-mode $1 $0 
>/tmp/ltrace.txt 2>&1 &
        exit 0
) &
exit 0

ltrace is attached

workaround that I have: I created an udev rule
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="1bbb", 
ATTRS{idProduct}=="0017", RUN+="/sbin/modprobe usbserial vendor=0x1bbb 
product=0x0017"
and it works

** Attachment added: "ltrace.txt.gz"
   
https://bugs.launchpad.net/ubuntu/+source/usb-modeswitch/+bug/824147/+attachment/3475446/+files/ltrace.txt.gz

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https://bugs.launchpad.net/bugs/824147

Title:
  usb_modeswitch_[2193]: segfault at 8 ip 00007eff40eab681 sp
  00007fff6a785f58 error 4 in libc-2.13.so[7eff40e29000+195000]

Status in “usb-modeswitch” package in Ubuntu:
  Fix Released

Bug description:
  mrl586@COMPAQ:~$ lsb_release -rd
  Description:    Ubuntu oneiric (development branch)
  Release:        11.10
  mrl586@COMPAQ:~$ apt-cache policy usb-modeswitch
  usb-modeswitch:
    Asennettu: 1.1.9-1ubuntu2
    Ehdokas:   1.1.9-1ubuntu2
    Versiotaulukko:
   *** 1.1.9-1ubuntu2 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

  Usb-modeswich segfault when I plug in Huawei E353 to computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: usb-modeswitch 1.1.9-1ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-8.10-generic 3.0.1
  Uname: Linux 3.0.0-8-generic x86_64
  Architecture: amd64
  Date: Wed Aug 10 22:33:44 2011
  InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
  SourcePackage: usb-modeswitch
  UpgradeStatus: Upgraded to oneiric on 2011-07-23 (18 days ago)

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