diff --git a/src/core/lib/gpr/sync_posix.cc b/src/core/lib/gpr/sync_posix.cc
index 4ded03055c8..6b6c6b6c4b7 100644
--- a/src/core/lib/gpr/sync_posix.cc
+++ b/src/core/lib/gpr/sync_posix.cc
@@ -39,7 +39,8 @@ void (*g_grpc_debug_timer_manager_stats)(
     int64_t abs_deadline_nsec_value, int64_t now1_sec_value,
     int64_t now1_nsec_value, int64_t now2_sec_value, int64_t now2_nsec_value,
     int64_t add_result_sec_value, int64_t add_result_nsec_value,
-    int64_t sub_result_sec_value, int64_t sub_result_nsec_value) = nullptr;
+    int64_t sub_result_sec_value, int64_t sub_result_nsec_value,
+    int64_t next_value, int64_t start_time_sec, int64_t start_time_nsec) = nullptr;
 int64_t g_timer_manager_init_count = 0;
 int64_t g_timer_manager_shutdown_count = 0;
 int64_t g_fork_count = 0;
@@ -58,6 +59,9 @@ int64_t g_add_result_sec_value = -1;
 int64_t g_add_result_nsec_value = -1;
 int64_t g_sub_result_sec_value = -1;
 int64_t g_sub_result_nsec_value = -1;
+int64_t g_next_value = -1;
+int64_t g_start_time_sec = -1;
+int64_t g_start_time_nsec = -1;
 #endif  // GRPC_DEBUG_TIMER_MANAGER
 
 #ifdef GPR_LOW_LEVEL_COUNTERS
@@ -212,7 +216,7 @@ int gpr_cv_wait(gpr_cv* cv, gpr_mu* mu, gpr_timespec abs_deadline) {
           g_abs_deadline_nsec_value, g_now1_sec_value, g_now1_nsec_value,
           g_now2_sec_value, g_now2_nsec_value, g_add_result_sec_value,
           g_add_result_nsec_value, g_sub_result_sec_value,
-          g_sub_result_nsec_value);
+          g_sub_result_nsec_value, g_next_value, g_start_time_sec, g_start_time_nsec);
     }
   }
 #endif
diff --git a/src/core/lib/iomgr/exec_ctx.cc b/src/core/lib/iomgr/exec_ctx.cc
index d68fa0714bf..683dd2f6493 100644
--- a/src/core/lib/iomgr/exec_ctx.cc
+++ b/src/core/lib/iomgr/exec_ctx.cc
@@ -53,6 +53,13 @@ static void exec_ctx_sched(grpc_closure* closure, grpc_error* error) {
 
 static gpr_timespec g_start_time;
 
+// For debug of the timer manager crash only.
+// TODO (mxyan): remove after bug is fixed.
+#ifdef GRPC_DEBUG_TIMER_MANAGER
+extern int64_t g_start_time_sec;
+extern int64_t g_start_time_nsec;
+#endif  // GRPC_DEBUG_TIMER_MANAGER
+
 static grpc_millis timespec_to_millis_round_down(gpr_timespec ts) {
   ts = gpr_time_sub(ts, g_start_time);
   double x = GPR_MS_PER_SEC * static_cast<double>(ts.tv_sec) +
@@ -117,6 +124,12 @@ void ExecCtx::TestOnlyGlobalInit(gpr_timespec new_val) {
 
 void ExecCtx::GlobalInit(void) {
   g_start_time = gpr_now(GPR_CLOCK_MONOTONIC);
+  // For debug of the timer manager crash only.
+  // TODO (mxyan): remove after bug is fixed.
+#ifdef GRPC_DEBUG_TIMER_MANAGER
+  g_start_time_sec = g_start_time.tv_sec;
+  g_start_time_nsec = g_start_time.tv_nsec;
+#endif
   gpr_tls_init(&exec_ctx_);
 }
 
diff --git a/src/core/lib/iomgr/timer_manager.cc b/src/core/lib/iomgr/timer_manager.cc
index ceba79f6783..143a96c9bc2 100644
--- a/src/core/lib/iomgr/timer_manager.cc
+++ b/src/core/lib/iomgr/timer_manager.cc
@@ -67,6 +67,7 @@ static void timer_thread(void* completed_thread_ptr);
 extern int64_t g_timer_manager_init_count;
 extern int64_t g_timer_manager_shutdown_count;
 extern int64_t g_fork_count;
+extern int64_t g_next_value;
 #endif  // GRPC_DEBUG_TIMER_MANAGER
 
 static void gc_completed_threads(void) {
@@ -193,6 +194,11 @@ static bool wait_until(grpc_millis next) {
       gpr_log(GPR_INFO, "sleep until kicked");
     }
 
+    // For debug of the timer manager crash only.
+    // TODO (mxyan): remove after bug is fixed.
+#ifdef GRPC_DEBUG_TIMER_MANAGER
+    g_next_value = next;
+#endif
     gpr_cv_wait(&g_cv_wait, &g_mu,
                 grpc_millis_to_timespec(next, GPR_CLOCK_MONOTONIC));