diff --git a/pkg/sentry/platform/systrap/metrics.go b/pkg/sentry/platform/systrap/metrics.go
index 9a2f17f89..de6555ea5 100644
--- a/pkg/sentry/platform/systrap/metrics.go
+++ b/pkg/sentry/platform/systrap/metrics.go
@@ -60,6 +60,10 @@ const (
 	minNecessaryRecordings = 5
 )
 
+// neverEnableFastPath is used for completely disabling the fast path.
+// It is set once so doesn't need any synchronizations.
+var neverEnableFastPath bool
+
 // latencyRecorder is used to collect latency metrics.
 type latencyRecorder struct {
 	stubBound   latencyBuckets
@@ -414,6 +418,9 @@ func (s *fastPathState) shouldDisableStubFP(stubMedian, sentryMedian cpuTicks) b
 // fastpath state machine described above.
 
 func sentryOffStubOff(s *fastPathState) {
+	if neverEnableFastPath {
+		return
+	}
 	periodStubBoundMedian := latencies.stubBound.getMedian()
 	s.stubBoundBaselineLatency.merge(&latencies.stubBound)
 	latencies.stubBound.reset()
diff --git a/pkg/sentry/platform/systrap/systrap.go b/pkg/sentry/platform/systrap/systrap.go
index 6292eb192..7a5310f7a 100644
--- a/pkg/sentry/platform/systrap/systrap.go
+++ b/pkg/sentry/platform/systrap/systrap.go
@@ -51,6 +51,7 @@ package systrap
 import (
 	"fmt"
 	"os"
+	"runtime"
 	"sync"
 
 	"golang.org/x/sys/unix"
@@ -324,6 +325,9 @@ func New() (*Systrap, error) {
 	}
 
 	stubInitialized.Do(func() {
+		// Don't use sentry and stub fast paths if here is just one cpu.
+		neverEnableFastPath = min(runtime.NumCPU(), runtime.GOMAXPROCS(0)) == 1
+
 		// Initialize the stub.
 		stubInit()