Corpus for getpgid:

Coverage	Program
4916	syz_mount_image$ext4-chdir-openat-openat-openat-syz_init_net_socket$bt_sco-socket$inet6-getsockopt$inet6_int-perf_event_open-write-write$P9_RREADLINK-openat-ftruncate-sendfile-setsockopt$inet6_IPV6_XFRM_POLICY-socket$netlink-getpgid
1340	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-migrate_pages-fork-ptrace-fork-ptrace-getpgid-gettid-ptrace$setsig
364	perf_event_open-getpgid-sched_getaffinity
114	gettid-getpgid
99	perf_event_open-syz_open_procfs-faccessat-syz_open_dev$hiddev-pipe-mount$9p_fd-openat-preadv-socket$inet6_udplite-fsmount-getpgid-rt_tgsigqueueinfo-ioctl$FS_IOC_SETVERSION-setsockopt$inet_IP_XFRM_POLICY-socket$inet_udp-bind$inet-openat-io_setup-kcmp$KCMP_EPOLL_TFD