UserLog dt=7 task=12 key_string=24 value_string=67 stack=27
UserRegionEnd dt=2 task=12 name_string=35 stack=28
GoDestroy dt=1
GoStart dt=2 g=7 g_seq=1
UserRegionBegin dt=13 task=12 name_string=31 stack=26
UserLog dt=5 task=12 key_string=24 value_string=68 stack=27
UserLog dt=6 task=12 key_string=24 value_string=69 stack=30
UserTaskBegin dt=5 task=13 parent_task=12 name_string=26 stack=31

		StartEv:      EvUserRegionBegin,
		IsTimedEvent: true,
		StackIDs:     []int{3},
		StringIDs:    []int{2},
	},
	EvUserLog: event.Spec{
		Name:         "UserLog",
		Args:         []string{"dt", "task", "key_string", "value_string", "stack"},
		IsTimedEvent: true,
		StackIDs:     []int{4},
		StringIDs:    []int{2, 3},
	},
	EvGoSwitch: event.Spec{

	var max uint64
	for id, s := range pr.Strings {
		evt.strings.insert(stringID(id), s)
		if id > max {
			max = id
		}
	}
	pr.Strings = nil

	// Add all strings used for UserLog. In the old trace format, these were
	// stored inline and didn't have IDs. We generate IDs for them.
	if max+uint64(len(pr.InlineStrings)) < max {
		return errors.New("trace contains too many strings")
	}

	traceRelease(tl)
}

// trace_userTaskEnd emits a UserRegionBegin or UserRegionEnd event.
//
//go:linkname trace_userLog runtime/trace.userLog
func trace_userLog(id uint64, category, message string) {
	tl := traceAcquire()
	if !tl.ok() {
		// Need to do this check because the caller won't have it.
		return
	}

	EvUserTaskEnd:       {"UserTaskEnd", 11, true, []string{"taskid"}, nil},
	EvUserRegion:        {"UserRegion", 11, true, []string{"taskid", "mode", "typeid"}, []string{"name"}},
	EvUserLog:           {"UserLog", 11, true, []string{"id", "keyid"}, []string{"category", "message"}},
	EvCPUSample:         {"CPUSample", 19, true, []string{"ts", "p", "g"}, nil},
}

//gcassert:inline

    Operation* user_op, int argument_index, ElementsAttr value,
    llvm::SmallVector<std::pair<Region*, int>, 4>* work_list,
    llvm::MapVector<Operation*, llvm::SmallVector<unsigned int, 4>>*
        arguments_to_erase) {
  if (auto read_variable_op = dyn_cast<TF::ReadVariableOp>(user_op)) {
    (*arguments_to_erase)[read_variable_op];
    PropagateUsage(read_variable_op, value);
  } else if (auto call = dyn_cast<CallOpInterface>(user_op)) {

n|sleep|slocate|sort|source|split|ssh|stat|strace|su|sudo|sum|suspend|sync|tail|tar|tee|test|time|timeout|times|touch|top|traceroute|trap|tr|tsort|tty|type|ulimit|umask|umount|unalias|uname|unexpand|uniq|units|unrar|unshar|uptime|useradd|userdel|usermod|users|uuencode|uudecode|v|vdir|vi|vmstat|wait|watch|wc|wget|whereis|which|who|whoami|write|xargs|xdg-open|yes|zip)(?=$|[\s;|&])/,lookbehind:!0},keyword:{pattern:/(^|[\s;|&])(?:let|:|\.|if|then|else|elif|fi|for|break|continue|while|in|case|functio...

    - macOS w/ Docker for Mac: domain socket is used, DOCKER_* should be unset. In Bash run `unset ${!DOCKER_*}`
  - Other things to check:
    - Linux: User isn't in 'docker' group.  Add and relogin.
      - Something like 'sudo usermod -a -G docker ${USER}'
      - RHEL7 bug and workaround: https://bugzilla.redhat.com/show_bug.cgi?id=1119282#c8
EOF
    return 1
  fi
}

# Wait for background jobs to finish. Return with