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Whats SIGSEGV, Segmentation fault in Qt

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I have a Qt program which displays the data it receives over UDP. It works fine for around 30 seconds but after a while it gives Segmentation Fault and crashes. This 30 seconds is also not fixed.

I used the debugger and got this: 

Program received signal SIGSEGV, Segmentation fault.
0x003c6fd4 in ?? () from /usr/lib/libQtGui.so.4

Can anyone tell me where the error might be?

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