--- strace.c.orig 2019-06-06 17:04:21.271016482 +0200 +++ strace.c 2019-06-06 17:04:32.371221549 +0200 @@ -1795,9 +1795,9 @@ } if (followfork) - ptrace_setoptions |= PTRACE_O_TRACECLONE | - PTRACE_O_TRACEFORK | - PTRACE_O_TRACEVFORK; + ptrace_setoptions |= PTRACE_O_TRACECLONE; + + debug_msg("ptrace_setoptions = %#x", ptrace_setoptions); test_ptrace_seize();