diff --git a/compiler-rt/lib/fuzzer/FuzzerCorpus.h b/compiler-rt/lib/fuzzer/FuzzerCorpus.h
--- a/compiler-rt/lib/fuzzer/FuzzerCorpus.h
+++ b/compiler-rt/lib/fuzzer/FuzzerCorpus.h
@@ -270,6 +270,15 @@
     return II;
   }
 
+  InputInfo &ChooseUnitToCrossOverWith(Random &Rand, bool UniformDist) {
+    if (!UniformDist) {
+      return ChooseUnitToMutate(Rand);
+    }
+    InputInfo &II = *Inputs[Rand(Inputs.size())];
+    assert(!II.U.empty());
+    return II;
+  }
+
   // Returns an index of random unit from the corpus to mutate.
   size_t ChooseUnitIdxToMutate(Random &Rand) {
     UpdateCorpusDistribution(Rand);
diff --git a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp b/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
--- a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
@@ -680,6 +680,7 @@
   Options.IgnoreCrashes = Flags.ignore_crashes;
   Options.MaxTotalTimeSec = Flags.max_total_time;
   Options.DoCrossOver = Flags.cross_over;
+  Options.CrossOverUniformDist = Flags.cross_over_uniform_dist;
   Options.MutateDepth = Flags.mutate_depth;
   Options.ReduceDepth = Flags.reduce_depth;
   Options.UseCounters = Flags.use_counters;
diff --git a/compiler-rt/lib/fuzzer/FuzzerFlags.def b/compiler-rt/lib/fuzzer/FuzzerFlags.def
--- a/compiler-rt/lib/fuzzer/FuzzerFlags.def
+++ b/compiler-rt/lib/fuzzer/FuzzerFlags.def
@@ -28,6 +28,16 @@
   "seed inputs will never be reduced. This option can be useful when seeds are"
   "not properly formed for the fuzz target but still have useful snippets.")
 FUZZER_FLAG_INT(cross_over, 1, "If 1, cross over inputs.")
+FUZZER_FLAG_INT(cross_over_uniform_dist, 0, "Experimental. If 1, use a "
+  "uniform probability distribution when choosing inputs to cross over with. "
+  "Some of the inputs in the corpus may never get chosen for mutation "
+  "depending on the input mutation scheduling policy. With this flag, all "
+  "inputs, regardless of the input mutation scheduling policy, can be chosen "
+  "as an input to cross over with. This can be particularly useful with "
+  "|keep_seed==1|; all the initial seed inputs, even though they do not "
+  "increase coverage because they are not properly formed, will still be "
+  "chosen as an input to cross over with.")
+
 FUZZER_FLAG_INT(mutate_depth, 5,
             "Apply this number of consecutive mutations to each input.")
 FUZZER_FLAG_INT(reduce_depth, 0, "Experimental/internal. "
diff --git a/compiler-rt/lib/fuzzer/FuzzerLoop.cpp b/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
--- a/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerLoop.cpp
@@ -666,8 +666,11 @@
   MD.StartMutationSequence();
 
   auto &II = Corpus.ChooseUnitToMutate(MD.GetRand());
-  if (Options.DoCrossOver)
-    MD.SetCrossOverWith(&Corpus.ChooseUnitToMutate(MD.GetRand()).U);
+  if (Options.DoCrossOver) {
+    auto &CrossOverII = Corpus.ChooseUnitToCrossOverWith(
+        MD.GetRand(), Options.CrossOverUniformDist);
+    MD.SetCrossOverWith(&CrossOverII.U);
+  }
   const auto &U = II.U;
   memcpy(BaseSha1, II.Sha1, sizeof(BaseSha1));
   assert(CurrentUnitData);
diff --git a/compiler-rt/lib/fuzzer/FuzzerOptions.h b/compiler-rt/lib/fuzzer/FuzzerOptions.h
--- a/compiler-rt/lib/fuzzer/FuzzerOptions.h
+++ b/compiler-rt/lib/fuzzer/FuzzerOptions.h
@@ -31,6 +31,7 @@
   int RssLimitMb = 0;
   int MallocLimitMb = 0;
   bool DoCrossOver = true;
+  bool CrossOverUniformDist = false;
   int MutateDepth = 5;
   bool ReduceDepth = false;
   bool UseCounters = false;
diff --git a/compiler-rt/test/fuzzer/cross_over_uniform_dist.test b/compiler-rt/test/fuzzer/cross_over_uniform_dist.test
new file mode 100644
--- /dev/null
+++ b/compiler-rt/test/fuzzer/cross_over_uniform_dist.test
@@ -0,0 +1,16 @@
+REQUIRES: linux, x86_64
+RUN: %cpp_compiler %S/KeepSeedTest.cpp -o %t-CrossOverUniformDistTest
+
+RUN: rm -rf %t-corpus
+RUN: mkdir %t-corpus
+RUN: echo -n "@SELECT" > %t-corpus/A
+RUN: echo -n "@FROM WHERE" > %t-corpus/B
+
+RUN: not %run %t-CrossOverUniformDistTest -keep_seed=1 -cross_over_uniform_dist=1 -seed=1 -runs=2000000 %t-corpus 2>&1 | FileCheck %s
+CHECK: BINGO
+
+RUN: rm -rf %t-corpus
+RUN: mkdir %t-corpus
+RUN: echo -n "@SELECT" > %t-corpus/A
+RUN: echo -n "@FROM WHERE" > %t-corpus/B
+RUN: %run %t-CrossOverUniformDistTest -keep_seed=1 -seed=1 -runs=2000000 %t-corpus 2>&1