// move to the next frame, but that's both more awkward to use in a "for"
	// loop and is harder to implement because we have to do things differently
	// for the first frame.
	u.initAt(^uintptr(0), ^uintptr(0), ^uintptr(0), gp, flags)
}

func (u *unwinder) initAt(pc0, sp0, lr0 uintptr, gp *g, flags unwindFlags) {
	// Don't call this "g"; it's too easy get "g" and "gp" confused.
	if ourg := getg(); ourg == gp && ourg == ourg.m.curg {

		prof.stack[2] = 0
		return
	}

	var nstk int
	gp := getg()
	sp := getcallersp()
	pc := getcallerpc()
	systemstack(func() {
		var u unwinder
		u.initAt(pc, sp, 0, gp, unwindSilentErrors|unwindJumpStack)
		nstk = 1 + tracebackPCs(&u, skip, prof.stack[1:])
	})
	if nstk < len(prof.stack) {
		prof.stack[nstk] = 0
	}
}

func (prof *mLockProfile) store() {

		KeepAlive(ep)
		return
	}

	// stack
	if gp := getg(); gp.m.curg.stack.lo <= uintptr(p) && uintptr(p) < gp.m.curg.stack.hi {
		found := false
		var u unwinder
		for u.initAt(gp.m.curg.sched.pc, gp.m.curg.sched.sp, 0, gp.m.curg, 0); u.valid(); u.next() {
			if u.frame.sp <= uintptr(p) && uintptr(p) < u.frame.varp {
				found = true
				break
			}
		}
		if found {

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