about "SIGRT_0 (Unknown signal 32)"

Hi, I am trace the reason of a segment fault. I found it is created by a readdir loop by add fprintf before&after it. I use strace and get following information: write(3, "\3\0\0\0\0\0\0\0\275\4\0\0\0\0\0\0\f\0\0\0\0\0\0\0\275"..., 196) = 196 cl

The address displayed by ldd

Hi, I have a small question, I am not sure if it belongs to kernel. I often use ldd to find librarys needed. In some systems,the address display by ldd not changes, But in other systems, it changes. What is the reason of the difference? Is it cause by some setting in kernel? Thanks in advance.