if got, want := offset, uint64(0); got != want {
		t.Errorf("got %x, want %x", got, want)
	}
	if !strings.HasSuffix(filename, "pprof.test") {
		t.Errorf("got %s, want pprof.test", filename)
	}
	addr := uint64(abi.FuncPCABIInternal(TestVMInfo))
	if addr < lo || addr > hi {
		t.Errorf("%x..%x does not contain function %p (%x)", lo, hi, TestVMInfo, addr)
	}
}

func useVMMapWithRetry(t *testing.T) (hi, lo uint64, err error) {

		if getg().m != h.mp {
			println("trap on wrong M", getg().m, h.mp)
			return false
		}
		// Save the signal context
		h.saveSigContext(ctxt)
		// Set PC to debugCallV2.
		ctxt.setsigpc(uint64(abi.FuncPCABIInternal(debugCallV2)))
		// Call injected. Switch to the debugCall protocol.
		testSigtrap = h.handleF
	case _Grunnable:
		// Ask InjectDebugCall to pause for a bit and then try
		// again to interrupt this goroutine.

//go:nosplit
//go:nowritebarrierrec
func setsig(i uint32, fn uintptr) {
	var sa sigactiont

	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
	sa.sa_mask = sigset_all
	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
		fn = abi.FuncPCABI0(sigtramp)
	}
	*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
	sigaction(i, &sa, nil)
}

//go:nosplit

// hold onto it for very long.
func mapaccess1(t *maptype, h *hmap, key unsafe.Pointer) unsafe.Pointer {
	if raceenabled && h != nil {
		callerpc := getcallerpc()
		pc := abi.FuncPCABIInternal(mapaccess1)
		racereadpc(unsafe.Pointer(h), callerpc, pc)
		raceReadObjectPC(t.Key, key, callerpc, pc)
	}
	if msanenabled && h != nil {
		msanread(key, t.Key.Size_)
	}
	if asanenabled && h != nil {

type scase struct {
	c    *hchan         // chan
	elem unsafe.Pointer // data element
}

var (
	chansendpc = abi.FuncPCABIInternal(chansend)
	chanrecvpc = abi.FuncPCABIInternal(chanrecv)
)

func selectsetpc(pc *uintptr) {
	*pc = getcallerpc()
}

func sellock(scases []scase, lockorder []uint16) {
	var c *hchan
	for _, o := range lockorder {

			if fwdSig[i] != _SIG_DFL && fwdSig[i] != _SIG_IGN {
				setsigstack(i)
			} else if fwdSig[i] == _SIG_IGN {
				sigInitIgnored(i)
			}
			continue
		}

		handlingSig[i] = 1
		setsig(i, abi.FuncPCABIInternal(sighandler))
	}
}

//go:nosplit
//go:nowritebarrierrec
func sigInstallGoHandler(sig uint32) bool {
	// For some signals, we respect an inherited SIG_IGN handler

// be used as the second word of an interface value.
func convT(t *_type, v unsafe.Pointer) unsafe.Pointer {
	if raceenabled {
		raceReadObjectPC(t, v, getcallerpc(), abi.FuncPCABIInternal(convT))
	}
	if msanenabled {
		msanread(v, t.Size_)
	}
	if asanenabled {
		asanread(v, t.Size_)
	}
	x := mallocgc(t.Size_, t, true)
	typedmemmove(t, x, v)
	return x
}

		// "runtime.unlock".
		skip += 1 // runtime.unlockWithRank.func1
	}
	prof.pending = 0

	prof.stack[0] = logicalStackSentinel
	if debug.runtimeContentionStacks.Load() == 0 {
		prof.stack[1] = abi.FuncPCABIInternal(_LostContendedRuntimeLock) + sys.PCQuantum
		prof.stack[2] = 0
		return
	}

	var nstk int
	gp := getg()
	sp := getcallersp()
	pc := getcallerpc()
	systemstack(func() {
		var u unwinder

	// should not be used". x86_64 kernel requires it. Only use it on
	// x86.
	if GOARCH == "386" || GOARCH == "amd64" {
		sa.sa_restorer = abi.FuncPCABI0(sigreturn__sigaction)
	}
	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
		if iscgo {
			fn = abi.FuncPCABI0(cgoSigtramp)
		} else {
			fn = abi.FuncPCABI0(sigtramp)
		}
	}
	sa.sa_handler = fn

		throw("unreachable")
	}

	if debugChan {
		print("chansend: chan=", c, "\n")
	}

	if raceenabled {
		racereadpc(c.raceaddr(), callerpc, abi.FuncPCABIInternal(chansend))
	}

	// Fast path: check for failed non-blocking operation without acquiring the lock.
	//
	// After observing that the channel is not closed, we observe that the channel is