[release-branch.go1.15] runtime, time: disable preemption in addtimer

The timerpMask optimization updates a mask of Ps (potentially)
containing timers in pidleget / pidleput. For correctness, it depends on
the assumption that new timers can only be added to a P's own heap.

addtimer violates this assumption if it is preempted after computing pp.
That G may then run on a different P, but adding a timer to the original
P's heap.

Avoid this by disabling preemption while pp is in use.

Other uses of doaddtimer should be OK:

* moveTimers: always moves to the current P's heap
* modtimer, cleantimers, addAdjustedTimers, runtimer: does not add net
  new timers to the heap while locked

For #44868
Fixes #45731

Change-Id: I4a5d080865e854931d0a3a09a51ca36879101d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/300610
Trust: Michael Pratt <[email protected]>
Run-TryBot: Michael Pratt <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/313129
Trust: Ian Lance Taylor <[email protected]>
Run-TryBot: Ian Lance Taylor <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>

Author: prattmic

src/runtime/time.go

@@ -254,13 +254,18 @@ func addtimer(t *timer) {
 
 	when := t.when
 
+	// Disable preemption while using pp to avoid changing another P's heap.
+	mp := acquirem()
+
 	pp := getg().m.p.ptr()
 	lock(&pp.timersLock)
 	cleantimers(pp)
 	doaddtimer(pp, t)
 	unlock(&pp.timersLock)
 
 	wakeNetPoller(when)
+
+	releasem(mp)
 }
 
 // doaddtimer adds t to the current P's heap.

src/time/sleep_test.go

@@ -501,3 +501,19 @@ func TestZeroTimerStopPanics(t *testing.T) {
 	var tr Timer
 	tr.Stop()
 }
+
+// Test that zero duration timers aren't missed by the scheduler. Regression test for issue 44868.
+func TestZeroTimer(t *testing.T) {
+	if testing.Short() {
+		t.Skip("-short")
+	}
+
+	for i := 0; i < 1000000; i++ {
+		s := Now()
+		ti := NewTimer(0)
+		<-ti.C
+		if diff := Since(s); diff > 2*Second {
+			t.Errorf("Expected time to get value from Timer channel in less than 2 sec, took %v", diff)
+		}
+	}
+}