tstest: ignore certain goroutines in ResourceCheckandrew/tstest-goroutine-ignore

On Unix platforms, it's possible that the net package will launch
goroutines that we cannot terminate and could live for an indeterminate
time; the stack looks like this:

  1 @ 0x43ae6e 0x81f72b 0x822392 0x82189d 0x8224a7 0x4a5d41
  #	0x81f72a	net._C2func_getaddrinfo+0x8a	_cgo_gotypes.go:94
  #	0x822391	net.cgoLookupIPCNAME.func1+0xb1	/go/1.19.2/x64/src/net/cgo_unix.go:160
  #	0x82189c	net.cgoLookupIPCNAME+0x27c	/go/1.19.2/x64/src/net/cgo_unix.go:160
  #	0x8224a6	net.cgoIPLookup+0x66		/go/1.19.2/x64/src/net/cgo_unix.go:217

In tests that do DNS lookups, it's possible that these goroutines will
result in a test flake. Rather than try to carefully shut those down,
just ignore them entirely when counting goroutines.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I25907e29d1a6b43a95002e1b55208cb965b9bfa4

5 files changed, 1392 insertions, 3 deletions

diff --git a/shell.nix b/shell.nix
index f65559ce0..ce144250d 100644
--- a/shell.nix
+++ b/shell.nix
@@ -51,5 +51,7 @@ in
 	    pkgs.gotools pkgs.gopls
 	    tailscale-go
 	    pkgs.graphviz
+	    pkgs.protobuf
+	    pkgs.protoc-gen-go
 	  ];
 	}
diff --git a/tstest/profilepb/generate.go b/tstest/profilepb/generate.go
new file mode 100644
index 000000000..67a19d174
--- /dev/null
+++ b/tstest/profilepb/generate.go
@@ -0,0 +1,3 @@
+//go:generate protoc --go_out=paths=source_relative:. --go_opt=Mprofile.proto=tailscale.com/tstest/profilepb profile.proto
+
+package profilepb
diff --git a/tstest/profilepb/profile.pb.go b/tstest/profilepb/profile.pb.go
new file mode 100644
index 000000000..ec260c19d
--- /dev/null
+++ b/tstest/profilepb/profile.pb.go
@@ -0,0 +1,1101 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Profile is a common stacktrace profile format.
+//
+// Measurements represented with this format should follow the
+// following conventions:
+//
+// - Consumers should treat unset optional fields as if they had been
+//   set with their default value.
+//
+// - When possible, measurements should be stored in "unsampled" form
+//   that is most useful to humans.  There should be enough
+//   information present to determine the original sampled values.
+//
+// - On-disk, the serialized proto must be gzip-compressed.
+//
+// - The profile is represented as a set of samples, where each sample
+//   references a sequence of locations, and where each location belongs
+//   to a mapping.
+// - There is a N->1 relationship from sample.location_id entries to
+//   locations. For every sample.location_id entry there must be a
+//   unique Location with that id.
+// - There is an optional N->1 relationship from locations to
+//   mappings. For every nonzero Location.mapping_id there must be a
+//   unique Mapping with that id.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.6
+// source: profile.proto
+
+package profilepb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Profile struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A description of the samples associated with each Sample.value.
+	// For a cpu profile this might be:
+	//
+	//	[["cpu","nanoseconds"]] or [["wall","seconds"]] or [["syscall","count"]]
+	//
+	// For a heap profile, this might be:
+	//
+	//	[["allocations","count"], ["space","bytes"]],
+	//
+	// If one of the values represents the number of events represented
+	// by the sample, by convention it should be at index 0 and use
+	// sample_type.unit == "count".
+	SampleType []*ValueType `protobuf:"bytes,1,rep,name=sample_type,json=sampleType,proto3" json:"sample_type,omitempty"`
+	// The set of samples recorded in this profile.
+	Sample []*Sample `protobuf:"bytes,2,rep,name=sample,proto3" json:"sample,omitempty"`
+	// Mapping from address ranges to the image/binary/library mapped
+	// into that address range.  mapping[0] will be the main binary.
+	Mapping []*Mapping `protobuf:"bytes,3,rep,name=mapping,proto3" json:"mapping,omitempty"`
+	// Useful program location
+	Location []*Location `protobuf:"bytes,4,rep,name=location,proto3" json:"location,omitempty"`
+	// Functions referenced by locations
+	Function []*Function `protobuf:"bytes,5,rep,name=function,proto3" json:"function,omitempty"`
+	// A common table for strings referenced by various messages.
+	// string_table[0] must always be "".
+	StringTable []string `protobuf:"bytes,6,rep,name=string_table,json=stringTable,proto3" json:"string_table,omitempty"`
+	// frames with Function.function_name fully matching the following
+	// regexp will be dropped from the samples, along with their successors.
+	DropFrames int64 `protobuf:"varint,7,opt,name=drop_frames,json=dropFrames,proto3" json:"drop_frames,omitempty"` // Index into string table.
+	// frames with Function.function_name fully matching the following
+	// regexp will be kept, even if it matches drop_frames.
+	KeepFrames int64 `protobuf:"varint,8,opt,name=keep_frames,json=keepFrames,proto3" json:"keep_frames,omitempty"` // Index into string table.
+	// Time of collection (UTC) represented as nanoseconds past the epoch.
+	TimeNanos int64 `protobuf:"varint,9,opt,name=time_nanos,json=timeNanos,proto3" json:"time_nanos,omitempty"`
+	// Duration of the profile, if a duration makes sense.
+	DurationNanos int64 `protobuf:"varint,10,opt,name=duration_nanos,json=durationNanos,proto3" json:"duration_nanos,omitempty"`
+	// The kind of events between sampled ocurrences.
+	// e.g [ "cpu","cycles" ] or [ "heap","bytes" ]
+	PeriodType *ValueType `protobuf:"bytes,11,opt,name=period_type,json=periodType,proto3" json:"period_type,omitempty"`
+	// The number of events between sampled occurrences.
+	Period int64 `protobuf:"varint,12,opt,name=period,proto3" json:"period,omitempty"`
+	// Freeform text associated to the profile.
+	Comment []int64 `protobuf:"varint,13,rep,packed,name=comment,proto3" json:"comment,omitempty"` // Indices into string table.
+	// Index into the string table of the type of the preferred sample
+	// value. If unset, clients should default to the last sample value.
+	DefaultSampleType int64 `protobuf:"varint,14,opt,name=default_sample_type,json=defaultSampleType,proto3" json:"default_sample_type,omitempty"`
+}
+
+func (x *Profile) Reset() {
+	*x = Profile{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Profile) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Profile) ProtoMessage() {}
+
+func (x *Profile) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Profile.ProtoReflect.Descriptor instead.
+func (*Profile) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Profile) GetSampleType() []*ValueType {
+	if x != nil {
+		return x.SampleType
+	}
+	return nil
+}
+
+func (x *Profile) GetSample() []*Sample {
+	if x != nil {
+		return x.Sample
+	}
+	return nil
+}
+
+func (x *Profile) GetMapping() []*Mapping {
+	if x != nil {
+		return x.Mapping
+	}
+	return nil
+}
+
+func (x *Profile) GetLocation() []*Location {
+	if x != nil {
+		return x.Location
+	}
+	return nil
+}
+
+func (x *Profile) GetFunction() []*Function {
+	if x != nil {
+		return x.Function
+	}
+	return nil
+}
+
+func (x *Profile) GetStringTable() []string {
+	if x != nil {
+		return x.StringTable
+	}
+	return nil
+}
+
+func (x *Profile) GetDropFrames() int64 {
+	if x != nil {
+		return x.DropFrames
+	}
+	return 0
+}
+
+func (x *Profile) GetKeepFrames() int64 {
+	if x != nil {
+		return x.KeepFrames
+	}
+	return 0
+}
+
+func (x *Profile) GetTimeNanos() int64 {
+	if x != nil {
+		return x.TimeNanos
+	}
+	return 0
+}
+
+func (x *Profile) GetDurationNanos() int64 {
+	if x != nil {
+		return x.DurationNanos
+	}
+	return 0
+}
+
+func (x *Profile) GetPeriodType() *ValueType {
+	if x != nil {
+		return x.PeriodType
+	}
+	return nil
+}
+
+func (x *Profile) GetPeriod() int64 {
+	if x != nil {
+		return x.Period
+	}
+	return 0
+}
+
+func (x *Profile) GetComment() []int64 {
+	if x != nil {
+		return x.Comment
+	}
+	return nil
+}
+
+func (x *Profile) GetDefaultSampleType() int64 {
+	if x != nil {
+		return x.DefaultSampleType
+	}
+	return 0
+}
+
+// ValueType describes the semantics and measurement units of a value.
+type ValueType struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Type int64 `protobuf:"varint,1,opt,name=type,proto3" json:"type,omitempty"` // Index into string table.
+	Unit int64 `protobuf:"varint,2,opt,name=unit,proto3" json:"unit,omitempty"` // Index into string table.
+}
+
+func (x *ValueType) Reset() {
+	*x = ValueType{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ValueType) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ValueType) ProtoMessage() {}
+
+func (x *ValueType) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ValueType.ProtoReflect.Descriptor instead.
+func (*ValueType) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ValueType) GetType() int64 {
+	if x != nil {
+		return x.Type
+	}
+	return 0
+}
+
+func (x *ValueType) GetUnit() int64 {
+	if x != nil {
+		return x.Unit
+	}
+	return 0
+}
+
+// Each Sample records values encountered in some program
+// context. The program context is typically a stack trace, perhaps
+// augmented with auxiliary information like the thread-id, some
+// indicator of a higher level request being handled etc.
+type Sample struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The ids recorded here correspond to a Profile.location.id.
+	// The leaf is at location_id[0].
+	LocationId []uint64 `protobuf:"varint,1,rep,packed,name=location_id,json=locationId,proto3" json:"location_id,omitempty"`
+	// The type and unit of each value is defined by the corresponding
+	// entry in Profile.sample_type. All samples must have the same
+	// number of values, the same as the length of Profile.sample_type.
+	// When aggregating multiple samples into a single sample, the
+	// result has a list of values that is the element-wise sum of the
+	// lists of the originals.
+	Value []int64 `protobuf:"varint,2,rep,packed,name=value,proto3" json:"value,omitempty"`
+	// label includes additional context for this sample. It can include
+	// things like a thread id, allocation size, etc
+	Label []*Label `protobuf:"bytes,3,rep,name=label,proto3" json:"label,omitempty"`
+}
+
+func (x *Sample) Reset() {
+	*x = Sample{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Sample) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Sample) ProtoMessage() {}
+
+func (x *Sample) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Sample.ProtoReflect.Descriptor instead.
+func (*Sample) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *Sample) GetLocationId() []uint64 {
+	if x != nil {
+		return x.LocationId
+	}
+	return nil
+}
+
+func (x *Sample) GetValue() []int64 {
+	if x != nil {
+		return x.Value
+	}
+	return nil
+}
+
+func (x *Sample) GetLabel() []*Label {
+	if x != nil {
+		return x.Label
+	}
+	return nil
+}
+
+type Label struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key int64 `protobuf:"varint,1,opt,name=key,proto3" json:"key,omitempty"` // Index into string table
+	// At most one of the following must be present
+	Str int64 `protobuf:"varint,2,opt,name=str,proto3" json:"str,omitempty"` // Index into string table
+	Num int64 `protobuf:"varint,3,opt,name=num,proto3" json:"num,omitempty"`
+	// Should only be present when num is present.
+	// Specifies the units of num.
+	// Use arbitrary string (for example, "requests") as a custom count unit.
+	// If no unit is specified, consumer may apply heuristic to deduce the unit.
+	// Consumers may also  interpret units like "bytes" and "kilobytes" as memory
+	// units and units like "seconds" and "nanoseconds" as time units,
+	// and apply appropriate unit conversions to these.
+	NumUnit int64 `protobuf:"varint,4,opt,name=num_unit,json=numUnit,proto3" json:"num_unit,omitempty"` // Index into string table
+}
+
+func (x *Label) Reset() {
+	*x = Label{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Label) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Label) ProtoMessage() {}
+
+func (x *Label) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Label.ProtoReflect.Descriptor instead.
+func (*Label) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *Label) GetKey() int64 {
+	if x != nil {
+		return x.Key
+	}
+	return 0
+}
+
+func (x *Label) GetStr() int64 {
+	if x != nil {
+		return x.Str
+	}
+	return 0
+}
+
+func (x *Label) GetNum() int64 {
+	if x != nil {
+		return x.Num
+	}
+	return 0
+}
+
+func (x *Label) GetNumUnit() int64 {
+	if x != nil {
+		return x.NumUnit
+	}
+	return 0
+}
+
+type Mapping struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Unique nonzero id for the mapping.
+	Id uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Address at which the binary (or DLL) is loaded into memory.
+	MemoryStart uint64 `protobuf:"varint,2,opt,name=memory_start,json=memoryStart,proto3" json:"memory_start,omitempty"`
+	// The limit of the address range occupied by this mapping.
+	MemoryLimit uint64 `protobuf:"varint,3,opt,name=memory_limit,json=memoryLimit,proto3" json:"memory_limit,omitempty"`
+	// Offset in the binary that corresponds to the first mapped address.
+	FileOffset uint64 `protobuf:"varint,4,opt,name=file_offset,json=fileOffset,proto3" json:"file_offset,omitempty"`
+	// The object this entry is loaded from.  This can be a filename on
+	// disk for the main binary and shared libraries, or virtual
+	// abstractions like "[vdso]".
+	Filename int64 `protobuf:"varint,5,opt,name=filename,proto3" json:"filename,omitempty"` // Index into string table
+	// A string that uniquely identifies a particular program version
+	// with high probability. E.g., for binaries generated by GNU tools,
+	// it could be the contents of the .note.gnu.build-id field.
+	BuildId int64 `protobuf:"varint,6,opt,name=build_id,json=buildId,proto3" json:"build_id,omitempty"` // Index into string table
+	// The following fields indicate the resolution of symbolic info.
+	HasFunctions    bool `protobuf:"varint,7,opt,name=has_functions,json=hasFunctions,proto3" json:"has_functions,omitempty"`
+	HasFilenames    bool `protobuf:"varint,8,opt,name=has_filenames,json=hasFilenames,proto3" json:"has_filenames,omitempty"`
+	HasLineNumbers  bool `protobuf:"varint,9,opt,name=has_line_numbers,json=hasLineNumbers,proto3" json:"has_line_numbers,omitempty"`
+	HasInlineFrames bool `protobuf:"varint,10,opt,name=has_inline_frames,json=hasInlineFrames,proto3" json:"has_inline_frames,omitempty"`
+}
+
+func (x *Mapping) Reset() {
+	*x = Mapping{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Mapping) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Mapping) ProtoMessage() {}
+
+func (x *Mapping) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Mapping.ProtoReflect.Descriptor instead.
+func (*Mapping) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *Mapping) GetId() uint64 {
+	if x != nil {
+		return x.Id
+	}
+	return 0
+}
+
+func (x *Mapping) GetMemoryStart() uint64 {
+	if x != nil {
+		return x.MemoryStart
+	}
+	return 0
+}
+
+func (x *Mapping) GetMemoryLimit() uint64 {
+	if x != nil {
+		return x.MemoryLimit
+	}
+	return 0
+}
+
+func (x *Mapping) GetFileOffset() uint64 {
+	if x != nil {
+		return x.FileOffset
+	}
+	return 0
+}
+
+func (x *Mapping) GetFilename() int64 {
+	if x != nil {
+		return x.Filename
+	}
+	return 0
+}
+
+func (x *Mapping) GetBuildId() int64 {
+	if x != nil {
+		return x.BuildId
+	}
+	return 0
+}
+
+func (x *Mapping) GetHasFunctions() bool {
+	if x != nil {
+		return x.HasFunctions
+	}
+	return false
+}
+
+func (x *Mapping) GetHasFilenames() bool {
+	if x != nil {
+		return x.HasFilenames
+	}
+	return false
+}
+
+func (x *Mapping) GetHasLineNumbers() bool {
+	if x != nil {
+		return x.HasLineNumbers
+	}
+	return false
+}
+
+func (x *Mapping) GetHasInlineFrames() bool {
+	if x != nil {
+		return x.HasInlineFrames
+	}
+	return false
+}
+
+// Describes function and line table debug information.
+type Location struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Unique nonzero id for the location.  A profile could use
+	// instruction addresses or any integer sequence as ids.
+	Id uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	// The id of the corresponding profile.Mapping for this location.
+	// It can be unset if the mapping is unknown or not applicable for
+	// this profile type.
+	MappingId uint64 `protobuf:"varint,2,opt,name=mapping_id,json=mappingId,proto3" json:"mapping_id,omitempty"`
+	// The instruction address for this location, if available.  It
+	// should be within [Mapping.memory_start...Mapping.memory_limit]
+	// for the corresponding mapping. A non-leaf address may be in the
+	// middle of a call instruction. It is up to display tools to find
+	// the beginning of the instruction if necessary.
+	Address uint64 `protobuf:"varint,3,opt,name=address,proto3" json:"address,omitempty"`
+	// Multiple line indicates this location has inlined functions,
+	// where the last entry represents the caller into which the
+	// preceding entries were inlined.
+	//
+	// E.g., if memcpy() is inlined into printf:
+	//
+	//	line[0].function_name == "memcpy"
+	//	line[1].function_name == "printf"
+	Line []*Line `protobuf:"bytes,4,rep,name=line,proto3" json:"line,omitempty"`
+	// Provides an indication that multiple symbols map to this location's
+	// address, for example due to identical code folding by the linker. In that
+	// case the line information above represents one of the multiple
+	// symbols. This field must be recomputed when the symbolization state of the
+	// profile changes.
+	IsFolded bool `protobuf:"varint,5,opt,name=is_folded,json=isFolded,proto3" json:"is_folded,omitempty"`
+}
+
+func (x *Location) Reset() {
+	*x = Location{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Location) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Location) ProtoMessage() {}
+
+func (x *Location) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Location.ProtoReflect.Descriptor instead.
+func (*Location) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *Location) GetId() uint64 {
+	if x != nil {
+		return x.Id
+	}
+	return 0
+}
+
+func (x *Location) GetMappingId() uint64 {
+	if x != nil {
+		return x.MappingId
+	}
+	return 0
+}
+
+func (x *Location) GetAddress() uint64 {
+	if x != nil {
+		return x.Address
+	}
+	return 0
+}
+
+func (x *Location) GetLine() []*Line {
+	if x != nil {
+		return x.Line
+	}
+	return nil
+}
+
+func (x *Location) GetIsFolded() bool {
+	if x != nil {
+		return x.IsFolded
+	}
+	return false
+}
+
+type Line struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The id of the corresponding profile.Function for this line.
+	FunctionId uint64 `protobuf:"varint,1,opt,name=function_id,json=functionId,proto3" json:"function_id,omitempty"`
+	// Line number in source code.
+	Line int64 `protobuf:"varint,2,opt,name=line,proto3" json:"line,omitempty"`
+}
+
+func (x *Line) Reset() {
+	*x = Line{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Line) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Line) ProtoMessage() {}
+
+func (x *Line) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Line.ProtoReflect.Descriptor instead.
+func (*Line) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *Line) GetFunctionId() uint64 {
+	if x != nil {
+		return x.FunctionId
+	}
+	return 0
+}
+
+func (x *Line) GetLine() int64 {
+	if x != nil {
+		return x.Line
+	}
+	return 0
+}
+
+type Function struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Unique nonzero id for the function.
+	Id uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Name of the function, in human-readable form if available.
+	Name int64 `protobuf:"varint,2,opt,name=name,proto3" json:"name,omitempty"` // Index into string table
+	// Name of the function, as identified by the system.
+	// For instance, it can be a C++ mangled name.
+	SystemName int64 `protobuf:"varint,3,opt,name=system_name,json=systemName,proto3" json:"system_name,omitempty"` // Index into string table
+	// Source file containing the function.
+	Filename int64 `protobuf:"varint,4,opt,name=filename,proto3" json:"filename,omitempty"` // Index into string table
+	// Line number in source file.
+	StartLine int64 `protobuf:"varint,5,opt,name=start_line,json=startLine,proto3" json:"start_line,omitempty"`
+}
+
+func (x *Function) Reset() {
+	*x = Function{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_profile_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Function) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Function) ProtoMessage() {}
+
+func (x *Function) ProtoReflect() protoreflect.Message {
+	mi := &file_profile_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Function.ProtoReflect.Descriptor instead.
+func (*Function) Descriptor() ([]byte, []int) {
+	return file_profile_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *Function) GetId() uint64 {
+	if x != nil {
+		return x.Id
+	}
+	return 0
+}
+
+func (x *Function) GetName() int64 {
+	if x != nil {
+		return x.Name
+	}
+	return 0
+}
+
+func (x *Function) GetSystemName() int64 {
+	if x != nil {
+		return x.SystemName
+	}
+	return 0
+}
+
+func (x *Function) GetFilename() int64 {
+	if x != nil {
+		return x.Filename
+	}
+	return 0
+}
+
+func (x *Function) GetStartLine() int64 {
+	if x != nil {
+		return x.StartLine
+	}
+	return 0
+}
+
+var File_profile_proto protoreflect.FileDescriptor
+
+var file_profile_proto_rawDesc = []byte{
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+	0x49, 0x64, 0x12, 0x18, 0x0a, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18, 0x03, 0x20,
+	0x01, 0x28, 0x04, 0x52, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x12, 0x2c, 0x0a, 0x04,
+	0x6c, 0x69, 0x6e, 0x65, 0x18, 0x04, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x18, 0x2e, 0x70, 0x65, 0x72,
+	0x66, 0x74, 0x6f, 0x6f, 0x6c, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x66, 0x69, 0x6c, 0x65, 0x73, 0x2e,
+	0x4c, 0x69, 0x6e, 0x65, 0x52, 0x04, 0x6c, 0x69, 0x6e, 0x65, 0x12, 0x1b, 0x0a, 0x09, 0x69, 0x73,
+	0x5f, 0x66, 0x6f, 0x6c, 0x64, 0x65, 0x64, 0x18, 0x05, 0x20, 0x01, 0x28, 0x08, 0x52, 0x08, 0x69,
+	0x73, 0x46, 0x6f, 0x6c, 0x64, 0x65, 0x64, 0x22, 0x3b, 0x0a, 0x04, 0x4c, 0x69, 0x6e, 0x65, 0x12,
+	0x1f, 0x0a, 0x0b, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x5f, 0x69, 0x64, 0x18, 0x01,
+	0x20, 0x01, 0x28, 0x04, 0x52, 0x0a, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x49, 0x64,
+	0x12, 0x12, 0x0a, 0x04, 0x6c, 0x69, 0x6e, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x03, 0x52, 0x04,
+	0x6c, 0x69, 0x6e, 0x65, 0x22, 0x8a, 0x01, 0x0a, 0x08, 0x46, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f,
+	0x6e, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x02, 0x69,
+	0x64, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x03, 0x52,
+	0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x1f, 0x0a, 0x0b, 0x73, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x5f,
+	0x6e, 0x61, 0x6d, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x03, 0x52, 0x0a, 0x73, 0x79, 0x73, 0x74,
+	0x65, 0x6d, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x1a, 0x0a, 0x08, 0x66, 0x69, 0x6c, 0x65, 0x6e, 0x61,
+	0x6d, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x03, 0x52, 0x08, 0x66, 0x69, 0x6c, 0x65, 0x6e, 0x61,
+	0x6d, 0x65, 0x12, 0x1d, 0x0a, 0x0a, 0x73, 0x74, 0x61, 0x72, 0x74, 0x5f, 0x6c, 0x69, 0x6e, 0x65,
+	0x18, 0x05, 0x20, 0x01, 0x28, 0x03, 0x52, 0x09, 0x73, 0x74, 0x61, 0x72, 0x74, 0x4c, 0x69, 0x6e,
+	0x65, 0x42, 0x2d, 0x0a, 0x1d, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
+	0x70, 0x65, 0x72, 0x66, 0x74, 0x6f, 0x6f, 0x6c, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x66, 0x69, 0x6c,
+	0x65, 0x73, 0x42, 0x0c, 0x50, 0x72, 0x6f, 0x66, 0x69, 0x6c, 0x65, 0x50, 0x72, 0x6f, 0x74, 0x6f,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_profile_proto_rawDescOnce sync.Once
+	file_profile_proto_rawDescData = file_profile_proto_rawDesc
+)
+
+func file_profile_proto_rawDescGZIP() []byte {
+	file_profile_proto_rawDescOnce.Do(func() {
+		file_profile_proto_rawDescData = protoimpl.X.CompressGZIP(file_profile_proto_rawDescData)
+	})
+	return file_profile_proto_rawDescData
+}
+
+var file_profile_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
+var file_profile_proto_goTypes = []interface{}{
+	(*Profile)(nil),   // 0: perftools.profiles.Profile
+	(*ValueType)(nil), // 1: perftools.profiles.ValueType
+	(*Sample)(nil),    // 2: perftools.profiles.Sample
+	(*Label)(nil),     // 3: perftools.profiles.Label
+	(*Mapping)(nil),   // 4: perftools.profiles.Mapping
+	(*Location)(nil),  // 5: perftools.profiles.Location
+	(*Line)(nil),      // 6: perftools.profiles.Line
+	(*Function)(nil),  // 7: perftools.profiles.Function
+}
+var file_profile_proto_depIdxs = []int32{
+	1, // 0: perftools.profiles.Profile.sample_type:type_name -> perftools.profiles.ValueType
+	2, // 1: perftools.profiles.Profile.sample:type_name -> perftools.profiles.Sample
+	4, // 2: perftools.profiles.Profile.mapping:type_name -> perftools.profiles.Mapping
+	5, // 3: perftools.profiles.Profile.location:type_name -> perftools.profiles.Location
+	7, // 4: perftools.profiles.Profile.function:type_name -> perftools.profiles.Function
+	1, // 5: perftools.profiles.Profile.period_type:type_name -> perftools.profiles.ValueType
+	3, // 6: perftools.profiles.Sample.label:type_name -> perftools.profiles.Label
+	6, // 7: perftools.profiles.Location.line:type_name -> perftools.profiles.Line
+	8, // [8:8] is the sub-list for method output_type
+	8, // [8:8] is the sub-list for method input_type
+	8, // [8:8] is the sub-list for extension type_name
+	8, // [8:8] is the sub-list for extension extendee
+	0, // [0:8] is the sub-list for field type_name
+}
+
+func init() { file_profile_proto_init() }
+func file_profile_proto_init() {
+	if File_profile_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_profile_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Profile); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ValueType); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Sample); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Label); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Mapping); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Location); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Line); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_profile_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Function); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_profile_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   8,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_profile_proto_goTypes,
+		DependencyIndexes: file_profile_proto_depIdxs,
+		MessageInfos:      file_profile_proto_msgTypes,
+	}.Build()
+	File_profile_proto = out.File
+	file_profile_proto_rawDesc = nil
+	file_profile_proto_goTypes = nil
+	file_profile_proto_depIdxs = nil
+}
diff --git a/tstest/profilepb/profile.proto b/tstest/profilepb/profile.proto
new file mode 100644
index 000000000..ee0391f5e
--- /dev/null
+++ b/tstest/profilepb/profile.proto
@@ -0,0 +1,212 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Profile is a common stacktrace profile format.
+//
+// Measurements represented with this format should follow the
+// following conventions:
+//
+// - Consumers should treat unset optional fields as if they had been
+//   set with their default value.
+//
+// - When possible, measurements should be stored in "unsampled" form
+//   that is most useful to humans.  There should be enough
+//   information present to determine the original sampled values.
+//
+// - On-disk, the serialized proto must be gzip-compressed.
+//
+// - The profile is represented as a set of samples, where each sample
+//   references a sequence of locations, and where each location belongs
+//   to a mapping.
+// - There is a N->1 relationship from sample.location_id entries to
+//   locations. For every sample.location_id entry there must be a
+//   unique Location with that id.
+// - There is an optional N->1 relationship from locations to
+//   mappings. For every nonzero Location.mapping_id there must be a
+//   unique Mapping with that id.
+
+syntax = "proto3";
+
+package perftools.profiles;
+
+option java_package = "com.google.perftools.profiles";
+option java_outer_classname = "ProfileProto";
+
+message Profile {
+  // A description of the samples associated with each Sample.value.
+  // For a cpu profile this might be:
+  //   [["cpu","nanoseconds"]] or [["wall","seconds"]] or [["syscall","count"]]
+  // For a heap profile, this might be:
+  //   [["allocations","count"], ["space","bytes"]],
+  // If one of the values represents the number of events represented
+  // by the sample, by convention it should be at index 0 and use
+  // sample_type.unit == "count".
+  repeated ValueType sample_type = 1;
+  // The set of samples recorded in this profile.
+  repeated Sample sample = 2;
+  // Mapping from address ranges to the image/binary/library mapped
+  // into that address range.  mapping[0] will be the main binary.
+  repeated Mapping mapping = 3;
+  // Useful program location
+  repeated Location location = 4;
+  // Functions referenced by locations
+  repeated Function function = 5;
+  // A common table for strings referenced by various messages.
+  // string_table[0] must always be "".
+  repeated string string_table = 6;
+  // frames with Function.function_name fully matching the following
+  // regexp will be dropped from the samples, along with their successors.
+  int64 drop_frames = 7;   // Index into string table.
+  // frames with Function.function_name fully matching the following
+  // regexp will be kept, even if it matches drop_frames.
+  int64 keep_frames = 8;  // Index into string table.
+
+  // The following fields are informational, do not affect
+  // interpretation of results.
+
+  // Time of collection (UTC) represented as nanoseconds past the epoch.
+  int64 time_nanos = 9;
+  // Duration of the profile, if a duration makes sense.
+  int64 duration_nanos = 10;
+  // The kind of events between sampled ocurrences.
+  // e.g [ "cpu","cycles" ] or [ "heap","bytes" ]
+  ValueType period_type = 11;
+  // The number of events between sampled occurrences.
+  int64 period = 12;
+  // Freeform text associated to the profile.
+  repeated int64 comment = 13; // Indices into string table.
+  // Index into the string table of the type of the preferred sample
+  // value. If unset, clients should default to the last sample value.
+  int64 default_sample_type = 14;
+}
+
+// ValueType describes the semantics and measurement units of a value.
+message ValueType {
+  int64 type = 1; // Index into string table.
+  int64 unit = 2; // Index into string table.
+}
+
+// Each Sample records values encountered in some program
+// context. The program context is typically a stack trace, perhaps
+// augmented with auxiliary information like the thread-id, some
+// indicator of a higher level request being handled etc.
+message Sample {
+  // The ids recorded here correspond to a Profile.location.id.
+  // The leaf is at location_id[0].
+  repeated uint64 location_id = 1;
+  // The type and unit of each value is defined by the corresponding
+  // entry in Profile.sample_type. All samples must have the same
+  // number of values, the same as the length of Profile.sample_type.
+  // When aggregating multiple samples into a single sample, the
+  // result has a list of values that is the element-wise sum of the
+  // lists of the originals.
+  repeated int64 value = 2;
+  // label includes additional context for this sample. It can include
+  // things like a thread id, allocation size, etc
+  repeated Label label = 3;
+}
+
+message Label {
+  int64 key = 1;   // Index into string table
+
+  // At most one of the following must be present
+  int64 str = 2;   // Index into string table
+  int64 num = 3;
+
+  // Should only be present when num is present.
+  // Specifies the units of num.
+  // Use arbitrary string (for example, "requests") as a custom count unit.
+  // If no unit is specified, consumer may apply heuristic to deduce the unit.
+  // Consumers may also  interpret units like "bytes" and "kilobytes" as memory
+  // units and units like "seconds" and "nanoseconds" as time units,
+  // and apply appropriate unit conversions to these.
+  int64 num_unit = 4;  // Index into string table
+}
+
+message Mapping {
+  // Unique nonzero id for the mapping.
+  uint64 id = 1;
+  // Address at which the binary (or DLL) is loaded into memory.
+  uint64 memory_start = 2;
+  // The limit of the address range occupied by this mapping.
+  uint64 memory_limit = 3;
+  // Offset in the binary that corresponds to the first mapped address.
+  uint64 file_offset = 4;
+  // The object this entry is loaded from.  This can be a filename on
+  // disk for the main binary and shared libraries, or virtual
+  // abstractions like "[vdso]".
+  int64 filename = 5;  // Index into string table
+  // A string that uniquely identifies a particular program version
+  // with high probability. E.g., for binaries generated by GNU tools,
+  // it could be the contents of the .note.gnu.build-id field.
+  int64 build_id = 6;  // Index into string table
+
+  // The following fields indicate the resolution of symbolic info.
+  bool has_functions = 7;
+  bool has_filenames = 8;
+  bool has_line_numbers = 9;
+  bool has_inline_frames = 10;
+}
+
+// Describes function and line table debug information.
+message Location {
+  // Unique nonzero id for the location.  A profile could use
+  // instruction addresses or any integer sequence as ids.
+  uint64 id = 1;
+  // The id of the corresponding profile.Mapping for this location.
+  // It can be unset if the mapping is unknown or not applicable for
+  // this profile type.
+  uint64 mapping_id = 2;
+  // The instruction address for this location, if available.  It
+  // should be within [Mapping.memory_start...Mapping.memory_limit]
+  // for the corresponding mapping. A non-leaf address may be in the
+  // middle of a call instruction. It is up to display tools to find
+  // the beginning of the instruction if necessary.
+  uint64 address = 3;
+  // Multiple line indicates this location has inlined functions,
+  // where the last entry represents the caller into which the
+  // preceding entries were inlined.
+  //
+  // E.g., if memcpy() is inlined into printf:
+  //    line[0].function_name == "memcpy"
+  //    line[1].function_name == "printf"
+  repeated Line line = 4;
+  // Provides an indication that multiple symbols map to this location's
+  // address, for example due to identical code folding by the linker. In that
+  // case the line information above represents one of the multiple
+  // symbols. This field must be recomputed when the symbolization state of the
+  // profile changes.
+  bool is_folded = 5;
+}
+
+message Line {
+  // The id of the corresponding profile.Function for this line.
+  uint64 function_id = 1;
+  // Line number in source code.
+  int64 line = 2;
+}
+
+message Function {
+  // Unique nonzero id for the function.
+  uint64 id = 1;
+  // Name of the function, in human-readable form if available.
+  int64 name = 2; // Index into string table
+  // Name of the function, as identified by the system.
+  // For instance, it can be a C++ mangled name.
+  int64 system_name = 3; // Index into string table
+  // Source file containing the function.
+  int64 filename = 4; // Index into string table
+  // Line number in source file.
+  int64 start_line = 5;
+}
diff --git a/tstest/resource.go b/tstest/resource.go
index ae085ef5c..5128d4649 100644
--- a/tstest/resource.go
+++ b/tstest/resource.go
@@ -6,12 +6,16 @@ package tstest
 
 import (
 	"bytes"
+	"compress/gzip"
+	"io"
 	"runtime"
 	"runtime/pprof"
 	"testing"
 	"time"
 
 	"github.com/google/go-cmp/cmp"
+	"google.golang.org/protobuf/proto"
+	"tailscale.com/tstest/profilepb"
 )
 
 func ResourceCheck(tb testing.TB) {
@@ -29,12 +33,13 @@ func ResourceCheck(tb testing.TB) {
 			}
 			time.Sleep(5 * time.Millisecond)
 		}
-		endN, endStacks := goroutines()
-		if endN <= startN {
+		filteredGoroutines := numGoroutines(tb, pprof.Lookup("goroutine"))
+		if filteredGoroutines <= startN {
 			return
 		}
+		endN, endStacks := goroutines()
 		tb.Logf("goroutine diff:\n%v\n", cmp.Diff(startStacks, endStacks))
-		tb.Fatalf("goroutine count: expected %d, got %d\n", startN, endN)
+		tb.Fatalf("goroutine count: expected %d, got %d (%d filtered)\n", startN, endN, filteredGoroutines)
 	})
 }
 
@@ -44,3 +49,69 @@ func goroutines() (int, []byte) {
 	p.WriteTo(b, 1)
 	return p.Count(), b.Bytes()
 }
+
+var ignoredGoroutineStarts = map[string]bool{
+	"net.cgoIPLookup": true,
+}
+
+func numGoroutines(tb testing.TB, p *pprof.Profile) int {
+	b := new(bytes.Buffer)
+	p.WriteTo(b, 0) // gzip-compressed protobuf format
+
+	zr, err := gzip.NewReader(b)
+	if err != nil {
+		tb.Logf("error creating gzip.Reader: %v", err)
+		return -1
+	}
+	pb, err := io.ReadAll(zr)
+	if err != nil {
+		tb.Logf("error decompressing profile: %v", err)
+		return -1
+	}
+
+	var prof profilepb.Profile
+	if err := proto.Unmarshal(pb, &prof); err != nil {
+		tb.Logf("error parsing profile: %v", err)
+		return -1
+	}
+
+	var (
+		functions = make(map[uint64]*profilepb.Function)
+		locations = make(map[uint64]*profilepb.Location)
+	)
+	for _, f := range prof.Function {
+		functions[f.Id] = f
+	}
+	for _, m := range prof.Location {
+		locations[m.Id] = m
+	}
+
+	var num int64
+	for _, sample := range prof.Sample {
+		skip := false
+		for _, locid := range sample.LocationId {
+			loc := locations[locid]
+			for _, line := range loc.Line {
+				fn := functions[line.FunctionId]
+				fname := prof.StringTable[fn.Name]
+				if ignoredGoroutineStarts[fname] {
+					tb.Logf("skipping goroutine: %s", fname)
+					skip = true
+					break
+				}
+			}
+			if skip {
+				break
+			}
+		}
+		if skip {
+			continue
+		}
+
+		for _, val := range sample.Value {
+			num += val
+		}
+	}
+
+	return int(num)
+}