diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index f591c86..6b3e148 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -62,11 +62,13 @@
   if (allocation == MAP_FAILED) {
     __libc_fatal("failed to allocate TLS");
   }
+  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, allocation, allocation_size, "bionic TLS guard page");
 
   thread->bionic_tls = reinterpret_cast<bionic_tls*>(static_cast<char*>(allocation) + PAGE_SIZE);
   if (mprotect(thread->bionic_tls, BIONIC_TLS_SIZE, PROT_READ | PROT_WRITE) != 0) {
     __libc_fatal("failed to mprotect TLS");
   }
+  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, thread->bionic_tls, BIONIC_TLS_SIZE, "bionic TLS");
 }
 
 void __init_thread_stack_guard(pthread_internal_t* thread) {
diff --git a/libc/bionic/pthread_exit.cpp b/libc/bionic/pthread_exit.cpp
index 3401ed7..9adf405 100644
--- a/libc/bionic/pthread_exit.cpp
+++ b/libc/bionic/pthread_exit.cpp
@@ -92,6 +92,10 @@
     thread->alternate_signal_stack = NULL;
   }
 
+  // Unmap the bionic TLS, including guard pages.
+  void* allocation = reinterpret_cast<char*>(thread->bionic_tls) - PAGE_SIZE;
+  munmap(allocation, BIONIC_TLS_SIZE + 2 * PAGE_SIZE);
+
   ThreadJoinState old_state = THREAD_NOT_JOINED;
   while (old_state == THREAD_NOT_JOINED &&
          !atomic_compare_exchange_weak(&thread->join_state, &old_state, THREAD_EXITED_NOT_JOINED)) {
diff --git a/libc/bionic/pthread_internal.cpp b/libc/bionic/pthread_internal.cpp
index 2bc2bfb..5819bc1 100644
--- a/libc/bionic/pthread_internal.cpp
+++ b/libc/bionic/pthread_internal.cpp
@@ -86,10 +86,6 @@
 }
 
 static void __pthread_internal_free(pthread_internal_t* thread) {
-  // Unmap the TLS, including guard pages.
-  void* allocation = reinterpret_cast<char*>(thread->bionic_tls) - PAGE_SIZE;
-  munmap(allocation, BIONIC_TLS_SIZE + 2 * PAGE_SIZE);
-
   if (thread->mmap_size != 0) {
     // Free mapped space, including thread stack and pthread_internal_t.
     munmap(thread->attr.stack_base, thread->mmap_size);