add a missing unlockTSO()

diff --git a/rts/Schedule.c b/rts/Schedule.c
index 7b57c0d..3f07d3c 100644 (file)
--- a/rts/Schedule.c
+++ b/rts/Schedule.c
@@ -2201,6 +2201,7 @@ threadStackOverflow(Capability *cap, StgTSO *tso)
       //
 
       if (tso->flags & TSO_SQUEEZED) {
+          unlockTSO(tso);
           return tso;
       }
       // #3677: In a stack overflow situation, stack squeezing may