Public bug reported:

xoscope crashes on changing the time/division if there is a channel
showing the math function "Diff 1-2"

If a channel is set to the math function "Diff 1-2" and you raise the
time/division (pressing 9) several times eg. 3 or 4 xoscope exits with a
segment fault.

In some other times (with same conditions) it stops responding and I
have to close it with ctrl+c ^C in this case it shows an error with
malloc() function.

I don't have any problems if I first set the time/division to it's
maximum (2000ms/div) and after that I set the channel to show the "Diff
1-2" function.

Some information:

artis@ubuntu:~$ dpkg --list | egrep xos
ii  xoscope                                   2.0-3.1ubuntu3                    
       amd64        digital oscilloscope
artis@ubuntu:~$ apt-cache policy xoscope 
xoscope:
  Instaŀlat: 2.0-3.1ubuntu3
  Candidat:  2.0-3.1ubuntu3
  Taula de versió:
 *** 2.0-3.1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status
artis@ubuntu:~$ lsb_release -rd
Description:    Ubuntu 13.10
Release:        13.10


I also will add as attachment some outputs of xoscope to the terminal.

** Affects: xoscope (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "xoscope output to terminal"
   
https://bugs.launchpad.net/bugs/1269523/+attachment/3949578/+files/xoscope_bug.txt

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https://bugs.launchpad.net/bugs/1269523

Title:
  xoscope crashes on changing the time/division if there is a chennel
  showing the math function "Diff 1-2"

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