diff --git a/src/core/lib/gpr/cpu_posix.cc b/src/core/lib/gpr/cpu_posix.cc
index 915fd4976c2..982ccbd6ffe 100644
--- a/src/core/lib/gpr/cpu_posix.cc
+++ b/src/core/lib/gpr/cpu_posix.cc
@@ -25,7 +25,6 @@
 #include <string.h>
 #include <unistd.h>
 
-#include <grpc/support/alloc.h>
 #include <grpc/support/cpu.h>
 #include <grpc/support/log.h>
 #include <grpc/support/sync.h>
@@ -52,7 +51,7 @@ unsigned gpr_cpu_num_cores(void) {
 
 static void delete_thread_id(void* value) {
   if (value) {
-    gpr_free(value);
+    free(value);
   }
 }
 
@@ -71,7 +70,10 @@ unsigned gpr_cpu_current_cpu(void) {
   unsigned int* thread_id =
       static_cast<unsigned int*>(pthread_getspecific(thread_id_key));
   if (thread_id == nullptr) {
-    thread_id = static_cast<unsigned int*>(gpr_malloc(sizeof(unsigned int)));
+    // Note we cannot use gpr_malloc here because this allocation can happen in
+    // a main thread and will only be free'd when the main thread exits, which
+    // will cause our internal memory counters to believe it is a leak.
+    thread_id = static_cast<unsigned int*>(malloc(sizeof(unsigned int)));
     pthread_setspecific(thread_id_key, thread_id);
   }
 
diff --git a/test/core/slice/percent_decode_corpus/clusterfuzz-testcase-minimized-grpc_percent_decode_fuzzer-5652313562808320 b/test/core/slice/percent_decode_corpus/clusterfuzz-testcase-minimized-grpc_percent_decode_fuzzer-5652313562808320
new file mode 100644
index 00000000000..797993a54d0
--- /dev/null
+++ b/test/core/slice/percent_decode_corpus/clusterfuzz-testcase-minimized-grpc_percent_decode_fuzzer-5652313562808320
@@ -0,0 +1 @@
+%c4%cc%c4%cc%cc%ccccc%cccc%ccc%ccc%cc%ccc%ccc
\ No newline at end of file
diff --git a/test/core/slice/percent_decode_fuzzer.cc b/test/core/slice/percent_decode_fuzzer.cc
index 11f71d92c46..da8e03a4662 100644
--- a/test/core/slice/percent_decode_fuzzer.cc
+++ b/test/core/slice/percent_decode_fuzzer.cc
@@ -31,23 +31,20 @@ bool squelch = true;
 bool leak_check = true;
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  grpc_core::testing::LeakDetector leak_detector(true);
   grpc_init();
-  {
-    grpc_core::testing::LeakDetector leak_detector(true);
-    grpc_slice input = grpc_slice_from_copied_buffer((const char*)data, size);
-    grpc_slice output;
-    if (grpc_strict_percent_decode_slice(
-            input, grpc_url_percent_encoding_unreserved_bytes, &output)) {
-      grpc_slice_unref(output);
-    }
-    if (grpc_strict_percent_decode_slice(
-            input, grpc_compatible_percent_encoding_unreserved_bytes,
-            &output)) {
-      grpc_slice_unref(output);
-    }
-    grpc_slice_unref(grpc_permissive_percent_decode_slice(input));
-    grpc_slice_unref(input);
+  grpc_slice input = grpc_slice_from_copied_buffer((const char*)data, size);
+  grpc_slice output;
+  if (grpc_strict_percent_decode_slice(
+          input, grpc_url_percent_encoding_unreserved_bytes, &output)) {
+    grpc_slice_unref(output);
   }
+  if (grpc_strict_percent_decode_slice(
+          input, grpc_compatible_percent_encoding_unreserved_bytes, &output)) {
+    grpc_slice_unref(output);
+  }
+  grpc_slice_unref(grpc_permissive_percent_decode_slice(input));
+  grpc_slice_unref(input);
   grpc_shutdown_blocking();
   return 0;
 }
diff --git a/test/core/slice/percent_encode_fuzzer.cc b/test/core/slice/percent_encode_fuzzer.cc
index 1da982bba28..4efa7a8d8e7 100644
--- a/test/core/slice/percent_encode_fuzzer.cc
+++ b/test/core/slice/percent_encode_fuzzer.cc
@@ -31,25 +31,23 @@ bool squelch = true;
 bool leak_check = true;
 
 static void test(const uint8_t* data, size_t size, const uint8_t* dict) {
+  grpc_core::testing::LeakDetector leak_detector(true);
   grpc_init();
-  {
-    grpc_core::testing::LeakDetector leak_detector(true);
-    grpc_slice input = grpc_slice_from_copied_buffer(
-        reinterpret_cast<const char*>(data), size);
-    grpc_slice output = grpc_percent_encode_slice(input, dict);
-    grpc_slice decoded_output;
-    // encoder must always produce decodable output
-    GPR_ASSERT(grpc_strict_percent_decode_slice(output, dict, &decoded_output));
-    grpc_slice permissive_decoded_output =
-        grpc_permissive_percent_decode_slice(output);
-    // and decoded output must always match the input
-    GPR_ASSERT(grpc_slice_eq(input, decoded_output));
-    GPR_ASSERT(grpc_slice_eq(input, permissive_decoded_output));
-    grpc_slice_unref(input);
-    grpc_slice_unref(output);
-    grpc_slice_unref(decoded_output);
-    grpc_slice_unref(permissive_decoded_output);
-  }
+  grpc_slice input =
+      grpc_slice_from_copied_buffer(reinterpret_cast<const char*>(data), size);
+  grpc_slice output = grpc_percent_encode_slice(input, dict);
+  grpc_slice decoded_output;
+  // encoder must always produce decodable output
+  GPR_ASSERT(grpc_strict_percent_decode_slice(output, dict, &decoded_output));
+  grpc_slice permissive_decoded_output =
+      grpc_permissive_percent_decode_slice(output);
+  // and decoded output must always match the input
+  GPR_ASSERT(grpc_slice_eq(input, decoded_output));
+  GPR_ASSERT(grpc_slice_eq(input, permissive_decoded_output));
+  grpc_slice_unref(input);
+  grpc_slice_unref(output);
+  grpc_slice_unref(decoded_output);
+  grpc_slice_unref(permissive_decoded_output);
   grpc_shutdown_blocking();
 }
 
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index c86339398b5..7c9fb8d6804 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -169124,6 +169124,29 @@
     ], 
     "uses_polling": false
   }, 
+  {
+    "args": [
+      "test/core/slice/percent_decode_corpus/clusterfuzz-testcase-minimized-grpc_percent_decode_fuzzer-5652313562808320"
+    ], 
+    "ci_platforms": [
+      "linux"
+    ], 
+    "cpu_cost": 0.1, 
+    "exclude_configs": [
+      "tsan"
+    ], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
+    "flaky": false, 
+    "language": "c", 
+    "name": "percent_decode_fuzzer_one_entry", 
+    "platforms": [
+      "mac", 
+      "linux"
+    ], 
+    "uses_polling": false
+  }, 
   {
     "args": [
       "test/core/slice/percent_decode_corpus/d5b2a7177339ba2b7ce2f60e5f4459bef1e72758"