Corpus for getpgid:

Coverage	Program
84	gettid-getpgid
64	perf_event_open-mknodat$loop-getpgid
37	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-getpgid
29	getpgid-kcmp
25	prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-getpgid
23	getpgid