for i := 0; i < 10; i++ {
			goroutineProf.WriteTo(io.Discard, 1)
		}
	})
}

// TestLabelSystemstack makes sure CPU profiler samples of goroutines running
// on systemstack include the correct pprof labels. See issue #48577
func TestLabelSystemstack(t *testing.T) {
	// Grab and re-set the initial value before continuing to ensure
	// GOGC doesn't actually change following the test.

	// synchronize with the tracer trying to flush our buffer
	// as well.
	seq := mp.trace.seqlock.Add(1)
	if debugTraceReentrancy && seq%2 != 1 {
		throw("bad use of trace.seqlock or tracer is reentrant")
	}
	systemstack(func() {
		lock(&trace.lock)
		for i := range mp.trace.buf {
			if mp.trace.buf[i] != nil {
				// N.B. traceBufFlush accepts a generation, but it
				// really just cares about gen%2.

	gp.m.winsyscall = winsyscall
}

func cgocallbackg1(fn, frame unsafe.Pointer, ctxt uintptr) {
	gp := getg()

	if gp.m.needextram || extraMWaiters.Load() > 0 {
		gp.m.needextram = false
		systemstack(newextram)
	}

	if ctxt != 0 {
		s := append(gp.cgoCtxt, ctxt)

		// Now we need to set gp.cgoCtxt = s, but we could get
		// a SIGPROF signal while manipulating the slice, and

	c.gcPercent.Store(in)

	return out
}

//go:linkname setGCPercent runtime/debug.setGCPercent
func setGCPercent(in int32) (out int32) {
	// Run on the system stack since we grab the heap lock.
	systemstack(func() {
		lock(&mheap_.lock)
		out = gcController.setGCPercent(in)
		gcControllerCommit()
		unlock(&mheap_.lock)
	})

	// If we just disabled GC, wait for any concurrent GC mark to

func (p *pageAlloc) scavenge(nbytes uintptr, shouldStop func() bool, force bool) uintptr {
	released := uintptr(0)
	for released < nbytes {
		ci, pageIdx := p.scav.index.find(force)
		if ci == 0 {
			break
		}
		systemstack(func() {
			released += p.scavengeOne(ci, pageIdx, nbytes-released)
		})
		if shouldStop != nil && shouldStop() {
			break
		}
	}
	return released
}

// and printable name of each signal.
type sigTabT struct {
	flags int32
	name  string
}

//go:linkname os_sigpipe os.sigpipe
func os_sigpipe() {
	systemstack(sigpipe)
}

func signame(sig uint32) string {
	if sig >= uint32(len(sigtable)) {
		return ""
	}
	return sigtable[sig].name
}

const (
	_SIG_DFL uintptr = 0
	_SIG_IGN uintptr = 1
)

			acceptStacks = append([][]string(nil), acceptStacks...)
			for i, stk := range acceptStacks {
				if goexperiment.StaticLockRanking {
					if !slices.ContainsFunc(stk, func(s string) bool {
						return s == "runtime.systemstack" || s == "runtime.mcall" || s == "runtime.mstart"
					}) {
						// stk is a call stack that is still on the user stack when
						// it calls runtime.unlock. Add the extra function that

//
// Consider marking persistentalloc'd types not in heap by embedding
// runtime/internal/sys.NotInHeap.
func persistentalloc(size, align uintptr, sysStat *sysMemStat) unsafe.Pointer {
	var p *notInHeap
	systemstack(func() {
		p = persistentalloc1(size, align, sysStat)
	})
	return unsafe.Pointer(p)
}

// Must run on system stack because stack growth can (re)invoke it.
// See issue 9174.
//

			heapBitsOff := spaceNeeded
			spaceNeeded += alignUp(typ.PtrBytes/goarch.PtrSize/8, goarch.PtrSize)
			npages := alignUp(spaceNeeded, pageSize) / pageSize
			var progSpan *mspan
			systemstack(func() {
				progSpan = mheap_.allocManual(npages, spanAllocPtrScalarBits)
				memclrNoHeapPointers(unsafe.Pointer(progSpan.base()), progSpan.npages*pageSize)
			})
			// Write a dummy _type in the new space.
			//

= vendor/bitbucket.org/bertimus9/systemstat licensed under: =

The MIT License (MIT)

Copyright (c) 2013 Phillip Bond

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of