probe kernel.function("sys_umount")
{
	printf("sys_umount: flags %d\n", $flags);
}
probe kernel.function("sys_umount").return
{
	printf("sys_umount: %d (%s)\n", $return, errno_str($return));
}
probe kernel.function("deactivate_super")
{
	printf("deactivate_super: sb %p\n", $s);
}
probe kernel.function("sys_umount").return
{
	printf("sys_umount: %d (%s)\n", $return, errno_str($return));
}
probe module("nfs").function("nfs_kill_super")
{
	printf("nfs_kill_super: super %p\n", $s);
}
probe module("nfs").function("nfs4_kill_super")
{
	printf("nfs4_kill_super: super %p\n", $sb);
}
probe module("nfs").function("nfs_free_server")
{
	printf("nfs_free_server: server %p\n", $server);
}
probe module("nfs").function("nfs_umount_begin")
{
	printf("nfs_umount_begin: vfsmnt %p flags 0x%x\n", $vfsmnt, flags);
}
probe module("sunrpc").function("rpc_killall_tasks")
{
	printf("rpc_killall_tasks: clnt %p\n", $clnt);
}
probe begin { log("starting nfs_umount probe") }
probe end { log("ending nfs_umount probe") }