Public bug reported:

MKVtoolnix's gui crashes 10s + 190ms ater launch  (yes, it crashes on a timer).
*** longjmp causes uninitialized stack frame ***: mmg terminated    (in libc: 
__fortify_fail)
It does happen only under unusual conditions, but a stack corruption is a 
serious problem anyway.

Conditions:
Enabled checking of new version   (on by default - Why??  Filled as bug 
#1014229)
New version has to be checked (set last_check=0 in ~/.config/mkvtoolnix/config 
to be sure)
Unreachable DNS servers
    This was caused by a crashed server in my case.
    Unplugging the network cable from the computer works (unless networmanager 
is used - the interface&routes need to stay up, so the packets are blackholed 
instead of returning hard errors)
    The sure way is probably "echo nameserver {IP} >/etc/resolv.conf",  while 
{IP} is an unused IP address on local network.

All done on 64b ubuntu Precise.

console output will be attached immediately,
strace output if requested.

PS: I don't understand why gnome-keyring appears on the memory map.

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

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https://bugs.launchpad.net/bugs/1014236

Title:
  mmg crashes after 10s with   fortify: longjmp causes uninitialized
  stack frame

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