commit dfec225ee1972488bb48a8b67a2c4a13010c334a

Author: JeffyChen <jeffy.chen@rock-chips.com>

Date:   Fri Jul 2 17:39:24 2021 +0200

    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 00a37f218c0ab3b2..61f7bdc76064c340 100644

--- a/malloc/malloc.c

+++ b/malloc/malloc.c

@@ -2960,12 +2960,13 @@ 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.  */