This is a partial recreation of this upstream commit, restricted to

the __malloc_info function:

commit 4bf5f2224baa1590f92f7a26930928fe9f7e4b57

Author: Florian Weimer <fweimer@redhat.com>

Date:   Tue Sep 6 12:49:54 2016 +0200

    malloc: Automated part of conversion to __libc_lock

diff --git a/malloc/malloc.c b/malloc/malloc.c

index 18e00315c6edba4d..d2a5e251da4f1191 100644

--- a/malloc/malloc.c

+++ b/malloc/malloc.c

@@ -5049,7 +5049,7 @@ __malloc_info (int options, FILE *fp)

       } sizes[NFASTBINS + NBINS - 1];

 #define nsizes (sizeof (sizes) / sizeof (sizes[0]))

-      mutex_lock (&ar_ptr->mutex);

+      __libc_lock_lock (ar_ptr->mutex);

       for (size_t i = 0; i < NFASTBINS; ++i)

 	{

@@ -5108,7 +5108,7 @@ __malloc_info (int options, FILE *fp)

 	  avail += sizes[NFASTBINS - 1 + i].total;

 	}

-      mutex_unlock (&ar_ptr->mutex);

+      __libc_lock_unlock (ar_ptr->mutex);

       total_nfastblocks += nfastblocks;

       total_fastavail += fastavail;