diff --git a/projects/rccl/src/enqueue.cc b/projects/rccl/src/enqueue.cc
index 22ec0abd6c..3946b32e37 100644
--- a/projects/rccl/src/enqueue.cc
+++ b/projects/rccl/src/enqueue.cc
@@ -1197,6 +1197,8 @@ static ncclResult_t scheduleP2pTasksToPlan(
 // Spin until its safe to increase comm->workFifoProduced to desiredProduced.
 static void waitWorkFifoAvailable(struct ncclComm* comm, uint32_t desiredProduced) {
   bool hasRoom = (desiredProduced - comm->workFifoConsumedLeast) <= comm->workFifoBytes;
+  uint64_t count = 0;
+  int warned = 0;
   if (hasRoom) return;
   while (true) {
     // We have to poll for notifications from device.
@@ -1235,6 +1237,17 @@ static void waitWorkFifoAvailable(struct ncclComm* comm, uint32_t desiredProduce
     hasRoom = (desiredProduced - comm->workFifoConsumedLeast) <= comm->workFifoBytes;
     if (hasRoom) break;
     sched_yield();
+
+    /* Warn if we get stuck waiting for workFifo. */
+    count++;
+    if (warned == 0 && count == 100000 && comm->rank == 0) {
+      warned = 1;
+      WARN("Waiting for work FIFO to become available. "
+           "Work fifo exhaustion can happen in large scale/high iteration count of alltoall. "
+           "In order to increase work FIFO size, set NCCL_WORK_FIFO_BYTES to higher number (current: %ld).\n\n"
+           "RCCL continues to retry...", comm->workFifoBytes);
+    }
+
   }
 }