malloc: Initiate tcache shutdown even without allocations [BZ #28028]

After commit 1e26d35193efbb29239c710a4c46a64708643320 ("malloc: Fix
tcache leak after thread destruction [BZ #22111]"),
tcache_shutting_down is still not early enough.  When we detach a
thread with no tcache allocated, tcache_shutting_down would still be
false.

Reviewed-by: DJ Delorie <dj@redhat.com>

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 0e2e1747e020bf2c5578a9973b7e159b04bc6c4a..bb9a1642aa543306bf9bd53bb539c90af1822b42 100644 (file)
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3144,12 +3144,13 @@ tcache_thread_shutdown (void)
   int i;
   tcache_perthread_struct *tcache_tmp = tcache;
 
+  tcache_shutting_down = true;
+
   if (!tcache)
     return;
 
   /* Disable the tcache and prevent it from being reinitialized.  */
   tcache = NULL;
-  tcache_shutting_down = true;
 
   /* Free all of the entries and the tcache itself back to the arena
      heap for coalescing.  */