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-rw-r--r--erts/emulator/beam/erl_nif.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 9ffb53d532..05bcf73451 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -587,6 +587,10 @@ int erts_flush_trace_messages(Process *c_p, ErtsProcLocks c_p_locks)
ErlTraceMessageQueue *msgq, **last_msgq;
int reds = 0;
+ /* Only one thread at a time is allowed to flush trace messages,
+ so we require the main lock to be held when doing the flush */
+ ERTS_CHK_HAVE_ONLY_MAIN_PROC_LOCK(c_p);
+
erts_proc_lock(c_p, ERTS_PROC_LOCK_TRACE);
msgq = c_p->trace_msg_q;