Hi All, Without vdso files and its debuginfo files, the systemtap could not unwind the user backtrace when the process is interrupted mid-syscall. It's important for off-cpu profiling.
See https://sourceware.org/ml/systemtap/2016-q1/msg00021.html for the issue. The ubuntu (14.04) also do vdso_install for the kernel pckage. Regards, Jinhua Luo
