Valgrind produced a vgcore.NNNN file -- how do I debug the core using GDB? Do I need to use the original executable and supply the core, or is there some other way to do it?
Using valgrind as the root executable doesn t seem to work, and using the executable that was being run under valgrind directly in GDB with the core seems to produce bad backtraces.
This works fine for me:
gdb ./a.out vgcore.21650
and that s how you are supposed to use the vgcore.
If your program corrupted stack before crashing, then obviously you wouldn t get good stack traces from vgcore. You might want to expand your question with actual Valgrind report that led to the crash.
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