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-rw-r--r--rts/Messages.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/rts/Messages.c b/rts/Messages.c
index 0508a20d20..8fab314bc4 100644
--- a/rts/Messages.c
+++ b/rts/Messages.c
@@ -289,7 +289,9 @@ loop:
recordClosureMutated(cap,(StgClosure*)bq);
}
- debugTraceCap(DEBUG_sched, cap, "thread %d blocked on thread %d",
+ debugTraceCap(DEBUG_sched, cap,
+ "thread %d blocked on existing BLOCKING_QUEUE "
+ "owned by thread %d",
(W_)msg->tso->id, (W_)owner->id);
// See above, #3838