1 files changed, 3 insertions, 0 deletions

diff --git a/mps/code/trace.c b/mps/code/trace.c
index 3958232dfec..1082eaefe78 100644
--- a/mps/code/trace.c
+++ b/mps/code/trace.c
@@ -308,6 +308,9 @@ static void traceSetSignalEmergency(TraceSet ts, Arena arena)
   TraceId ti;
   Trace trace;
 
+  DIAG_SINGLEF(( "traceSetSignalEmergency",
+    "traceSet: $B", ts, NULL ));
+
   TRACE_SET_ITER(ti, trace, ts, arena)
     trace->emergency = TRUE;
   TRACE_SET_ITER_END(ti, trace, ts, arena);