Corpus for getpgrp:

Coverage	Program
2501	syz_emit_ethernet-mlock2-perf_event_open-getpgrp-madvise-prlimit64-gettid-openat$tun-ioctl$TUNSETQUEUE
49	syz_emit_ethernet-mlock2-perf_event_open-getpgrp-setpgid-madvise-syz_emit_ethernet-prlimit64-openat$tun-getsockopt$sock_cred-ioctl$TUNSETQUEUE
48	getpgrp