Did you try to run strace on it? It is a longshot, since most other alterations change the behavior, but it is worth a try. When the seg fault 'goes away', is the hardware still initialized correctly?
To me: 
  if ($CustomHardware && $ErraticSegFaultBasedOnConditions) {
    checkTimingConditionsConcerningHardware();
  }

[download]

In reply to Re: disappearing segfault by Illuminatus
in thread disappearing segfault by cfreeman

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