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-rw-r--r--rts/TraverseHeap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/rts/TraverseHeap.c b/rts/TraverseHeap.c
index 8bf58c11ee..636737aa0f 100644
--- a/rts/TraverseHeap.c
+++ b/rts/TraverseHeap.c
@@ -1250,6 +1250,7 @@ inner_loop:
traversePushClosure(ts, (StgClosure *) tso->trec, c, child_data);
if ( tso->why_blocked == BlockedOnMVar
|| tso->why_blocked == BlockedOnMVarRead
+ || tso->why_blocked == BlockedOnIOCompletion
|| tso->why_blocked == BlockedOnBlackHole
|| tso->why_blocked == BlockedOnMsgThrowTo
) {