1 files changed, 3 insertions, 0 deletions
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index e995a7a0..5e5bc171 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -609,6 +609,9 @@ int main(int argc, char** argv, char** envp) {
   OKF("afl-tmin fork server patch from github.com/nccgroup/TriforceAFL");
   OKF("MOpt Mutator from github.com/puppet-meteor/MOpt-AFL");
 
+  if (sync_id && force_deterministic && (getenv("AFL_CUSTOM_MUTATOR_ONLY") || getenv("AFL_PYTHON_ONLY")))
+    WARNF("Using -M master with the AFL_..._ONLY mutator options will result in no deterministic mutations being done!");
+
   check_environment_vars(envp);
 
   if (fixed_seed) OKF("Running with fixed seed: %u", (u32)init_seed);