How do I rectify this segmentation fault

srinivasj

Beginner

Posts: 17

Monday, May 12th 2008, 8:21am

How do I rectify this segmentation fault

When I am running a QT Application, the application is segmenting with the following message ? What does this message actually mean , How do I
rectify this?

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912499279680 (LWP 863)]
0x0000003e795007d2 in QApplication::internalNotify () from /usr/lib64/qt-3.3/lib/libqt-mt.so.3

Thanks in advance.

Nicolas SOUCHON

Professional

Posts: 920

Monday, May 12th 2008, 10:48am

RE: How do I rectify this segmentation fault

probably accessing a uninitialized pointer

you could, for instance, obtain such an error with

	Source code
1 2 3	int * a = NULL; // ... *a = 0;

	Source code
1 2 3 4 5	int * a = new int; // ... delete a; // ... *a = 0;

	Source code
1 2 3	int * a = new int [10]; // ... a[12] = 0;

or ... many other erronous code

compile with debug

verify a core file is generated
if not, parameter your Linux (I don't remember exactly where)
- /etc/sysctl.conf
kernel.core_pattern
kernel.core_uses_pid
- ~/.bashrc
ulimit -c unlimited

rerun
after crash run: kdbg|gdb yourApp generatedCoreFile
you will obtain a call stack, be abble to move in this call stack and to examine variables at crash time

Nicolas

This post has been edited 5 times, last edit by "Nicolas SOUCHON" (May 12th 2008, 11:49am)

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How do I rectify this segmentation fault

How do I rectify this segmentation fault

RE: How do I rectify this segmentation fault

Source code

Source code

Source code