2 files changed, 17 insertions, 4 deletions
diff --git a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go
index be6b07629..24528b66a 100755
--- a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go
+++ b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo_unsafe.go
@@ -1,11 +1,12 @@
 package kernel
 
 import (
+	"strings"
+	"unsafe"
+
 	"fmt"
 	"gvisor.dev/gvisor/third_party/gvsync"
 	"reflect"
-	"strings"
-	"unsafe"
 )
 
 // SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race
diff --git a/pkg/sentry/kernel/task_start.go b/pkg/sentry/kernel/task_start.go
index a88bf3951..d60cd62c7 100644
--- a/pkg/sentry/kernel/task_start.go
+++ b/pkg/sentry/kernel/task_start.go
@@ -250,8 +250,20 @@ func (ns *PIDNamespace) allocateTID() (ThreadID, error) {
 		}
 
 		// Is it available?
-		_, ok := ns.tasks[tid]
-		if !ok {
+		tidInUse := func() bool {
+			if _, ok := ns.tasks[tid]; ok {
+				return true
+			}
+			if _, ok := ns.processGroups[ProcessGroupID(tid)]; ok {
+				return true
+			}
+			if _, ok := ns.sessions[SessionID(tid)]; ok {
+				return true
+			}
+			return false
+		}()
+
+		if !tidInUse {
 			ns.last = tid
 			return tid, nil
 		}