Corpus for sigaltstack:

Coverage	Program
1246	shmget$private-shmat-sigaltstack
721	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-sigaltstack
77	syz_io_uring_setup-syz_io_uring_submit-sigaltstack-sigaltstack
74	syz_io_uring_setup-syz_io_uring_submit-sigaltstack
63	syz_io_uring_setup-syz_io_uring_submit-sigaltstack