diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 15f18aa..70a9bf5 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -153,6 +153,7 @@
 
   pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(calloc(sizeof(*thread), 1));
   if (thread == NULL) {
+    __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: couldn't allocate thread");
     return EAGAIN;
   }
   thread->allocated_on_heap = true;
@@ -172,6 +173,7 @@
     thread->attr.stack_base = __create_thread_stack(stack_size, thread->attr.guard_size);
     if (thread->attr.stack_base == NULL) {
       free(thread);
+      __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: couldn't allocate %zd-byte stack", stack_size);
       return EAGAIN;
     }
   } else {
@@ -203,6 +205,7 @@
       munmap(thread->attr.stack_base, stack_size);
     }
     free(thread);
+    __libc_format_log(ANDROID_LOG_WARN, "libc", "pthread_create failed: clone failed: %s", strerror(errno));
     return clone_errno;
   }