Qt application exit with a segmentation fault

I am using Qt 4.6.3 for my mini2440 (ARM9) board. Qt is compiled using uClib. I can run all the example with -qws option. They work fine, but when exiting, a segmentation fault error occur.

I tried Qt 4.7.1, 4.7.2 and got the same result.
Because uClib doesn't have pthread_getattr_np function, I have to patch Qt with the patch from buildroot. Is this the reason for my problem and how can I fix that?

Thank you very much

try to use arm-linux-gcc in DVD of FriendlyARM.
It worked ok for me :)