I’m having a strange problem with my UINavigationController. the stacktraces are:

which is very odd to me because all I did was:
CommonVC* cvc = [[CommonVC alloc] init];
//CommonVC is my customized viewController. and i did some setting after the init.
[self.navigationController pushViewController:cvc animated:TRUE];
[cvc release];
and after 3 times pushing and popping it crashes.
i also ran it with NSZombie but it told the zombie is the CommonVC itself.

so can anyone help me find where the problem would be?
Do you make use of delegates and set them in your view controller. If yes check if they are made nil…