Zig stack mem returned from func printing, but not mutating

hello.zig

const std = @import("std");

const Point = struct {
    x: i32,
    y: i32,

    fn print(self: Point) void {
        std.debug.print("x is {}, y is {}\n", .{self.x, self.y});
    }

};


pub fn main() void {
    var p = Point {.x = 32, .y = 45 };    
    var copyValPtr: *Point = reverse_facade(p);    
    copyValPtr.print(); //pointer available here
    reverse(copyValPtr); // not available here   
    copyValPtr.print();
}

fn reverse_facade(p: Point) *Point {
    var q = Point{.x = p.x, .y =p.y};  //copy
    var ptr = &q;
    return ptr; //escapes?
}

fn reverse(p: *Point) void{    
    const temp = p.y;
    p.y = p.x;
    p.x = temp;    
}

And here is the output

x is 32, y is 45
Segmentation fault at address 0xffffffffffffffff
C:\personal\zigspace\test\hello.zig:31:11: 0x7ff60b42c6ac in reverse (hello.obj)
    p.x = temp;
          ^
C:\personal\zigspace\test\hello.zig:18:12: 0x7ff60b4133c3 in main (hello.obj)
    reverse(copyValPtr); // not available here
           ^
C:\personal\softwares\bin\lib\zig\std\start.zig:134:65: 0x7ff60b411897 in std.start.WinMainCRTStartup (hello.obj)
    std.os.windows.kernel32.ExitProcess(initEventLoopAndCallMain());
                                                                ^