diff --git a/Makeconfig b/Makeconfig
index 407df9e6a1..991d6d3e99 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -951,7 +951,7 @@ libio-include = -I$(..)libio
 built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \
 		libSegFault libpcprofile librpcsvc locale-programs \
 		memusagestat nonlib nscd extramodules libnldbl libsupport \
-		testsuite
+		testsuite libmalloc_compathooks
 
 in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \
 				    $(libof-$(<F)) \
diff --git a/NEWS b/NEWS
index 8e72946c3f..cebe8384bf 100644
--- a/NEWS
+++ b/NEWS
@@ -97,6 +97,15 @@ Deprecated and removed features, and other changes affecting compatibility:
   mtrace.  Similar functionality can be achieved by using conditional
   breakpoints within mtrace functions from within gdb.
 
+* The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
+  __memalign_hook and __free_hook are now removed from the API.  Compatibility
+  symbols are present to support legacy programs but new applications can no
+  longer link to these symbols.  Further, the hooks no longer have any effect
+  on glibc functionality.  A compatibility DSO libmalloc_compathooks.so has
+  been provided as a transitional measure to get hook functionality back for
+  legacy programs until they are updated to remove references to the memory
+  allocation hooks.
+
 Changes to build and runtime requirements:
 
 * On Linux, the shm_open, sem_open, and related functions now expect the
diff --git a/malloc/Makefile b/malloc/Makefile
index c9879c44e7..8674f5dc97 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
 	 tst-malloc-stats-cancellation \
 	 tst-tcfree1 tst-tcfree2 tst-tcfree3 \
 	 tst-safe-linking \
+	 tst-compathooks-off tst-compathooks-on
 
 tests-static := \
 	 tst-interpose-static-nothread \
@@ -113,8 +114,8 @@ routines = malloc morecore mcheck mtrace obstack reallocarray \
 install-lib := libmcheck.a
 non-lib.a := libmcheck.a
 
-# Additional library.
-extra-libs = libmemusage
+# Additional libraries.
+extra-libs = libmemusage libmalloc_compathooks
 extra-libs-others = $(extra-libs)
 
 # Helper objects for some tests.
@@ -129,6 +130,9 @@ test-extras = \
 libmemusage-routines = memusage
 libmemusage-inhibit-o = $(filter-out .os,$(object-suffixes))
 
+libmalloc_compathooks-routines = malloc-compathooks
+libmalloc_compathooks-inhibit-o = $(filter-out .os,$(object-suffixes))
+
 $(objpfx)tst-malloc-backtrace: $(shared-thread-library)
 $(objpfx)tst-malloc-thread-exit: $(shared-thread-library)
 $(objpfx)tst-malloc-thread-fail: $(shared-thread-library)
@@ -319,3 +323,10 @@ $(objpfx)tst-mallocfork2-mcheck: $(shared-thread-library)
 $(objpfx)tst-malloc-tcache-leak-malloc-check: $(shared-thread-library)
 $(objpfx)tst-malloc_info-malloc-check: $(shared-thread-library)
 $(objpfx)tst-mallocfork2-malloc-check: $(shared-thread-library)
+
+tst-compathooks-on-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-compathooks-on-mcheck-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-compathooks-on-malloc-check-ENV = \
+	LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-mallocstate-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-mallocstate-malloc-check-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
diff --git a/malloc/arena.c b/malloc/arena.c
index a8500a25c9..8591c8ea56 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -408,11 +408,6 @@ ptmalloc_init (void)
     __mcheck_initialize (NULL, false);
 #endif
 
-#if HAVE_MALLOC_INIT_HOOK
-  void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
-  if (hook != NULL)
-    (*hook)();
-#endif
   __malloc_initialized = 1;
 }
 
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 7f3b07ca44..397220aaba 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -42,23 +42,84 @@ enum malloc_debug_hooks
 static unsigned __malloc_debugging_hooks;
 
 /* Forward declarations.  */
+static void ptmalloc_init (void);
 
-#if HAVE_MALLOC_INIT_HOOK
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
 void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon));
 compat_symbol (libc, __malloc_initialize_hook,
 	       __malloc_initialize_hook, GLIBC_2_0);
+
+# define MALLOC_INIT_HOOK() ({ \
+  void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);	      \
+  if (hook != NULL)							      \
+    (*hook)();								      \
+})
+#else
+# define MALLOC_INIT_HOOK()
 #endif
 
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+
+static void *malloc_hook_ini (size_t, const void *) __THROW;
+static void *realloc_hook_ini (void *, size_t, const void *) __THROW;
+static void *memalign_hook_ini (size_t, size_t, const void *) __THROW;
+
 void weak_variable (*__free_hook) (void *__ptr,
                                    const void *) = NULL;
 void *weak_variable (*__malloc_hook)
-  (size_t __size, const void *) = NULL;
+  (size_t __size, const void *) = malloc_hook_ini;
 void *weak_variable (*__realloc_hook)
-  (void *__ptr, size_t __size, const void *) = NULL;
+  (void *__ptr, size_t __size, const void *) = realloc_hook_ini;
 void *weak_variable (*__memalign_hook)
-  (size_t __alignment, size_t __size, const void *) = NULL;
+  (size_t __alignment, size_t __size, const void *) = memalign_hook_ini;
 
-static void ptmalloc_init (void);
+compat_symbol (libc, __free_hook, __free_hook, GLIBC_2_0);
+compat_symbol (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
+compat_symbol (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
+compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
+
+/* These hooks will get executed only through the interposed allocator
+   functions in libmalloc_compathooks.  This means that the calls to malloc,
+   realloc, etc. will lead back into the interposed functions, which is what we
+   want.
+
+   These initial hooks are assumed to be called in a single-threaded context,
+   so it is safe to reset all hooks at once upon initialization.  */
+
+static void
+generic_hook_ini (void)
+{
+  __malloc_hook = NULL;
+  __realloc_hook = NULL;
+  __memalign_hook = NULL;
+  if (__malloc_initialized < 0)
+    {
+      ptmalloc_init ();
+      MALLOC_INIT_HOOK ();
+    }
+}
+
+static void *
+malloc_hook_ini (size_t sz, const void *caller)
+{
+  generic_hook_ini ();
+  return malloc (sz);
+}
+
+static void *
+realloc_hook_ini (void *ptr, size_t sz, const void *caller)
+{
+  generic_hook_ini ();
+  return realloc (ptr, sz);
+}
+
+static void *
+memalign_hook_ini (size_t alignment, size_t sz, const void *caller)
+{
+  generic_hook_ini ();
+  return memalign (alignment, sz);
+}
+#endif
 
 static __always_inline bool
 __is_malloc_debug_enabled (enum malloc_debug_hooks flag)
@@ -88,14 +149,6 @@ _malloc_debug_before (size_t *bytesp, void **victimp, const void *address)
   _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2,
 		  "PTRDIFF_MAX is not more than half of SIZE_MAX");
 
-  void *(*hook) (size_t, const void *)
-    = atomic_forced_read (__malloc_hook);
-  if (__builtin_expect (hook != NULL, 0))
-    {
-      *victimp = (*hook)(*bytesp, address);
-      return true;
-    }
-
   if (__glibc_unlikely (__malloc_debugging_hooks))
     {
       if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -126,14 +179,6 @@ _malloc_debug_after (void *mem, size_t bytes, const void *address)
 static __always_inline bool
 _free_debug_before (void **mem, const void *address)
 {
-  void (*hook) (void *, const void *)
-    = atomic_forced_read (__free_hook);
-  if (__builtin_expect (hook != NULL, 0))
-    {
-      (*hook)(*mem, address);
-      return true;
-    }
-
   if (__glibc_unlikely (__malloc_debugging_hooks))
     {
       if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
@@ -153,14 +198,6 @@ static __always_inline bool
 _realloc_debug_before (void **oldmem, size_t *bytesp, size_t *oldsize,
 		       void **victimp, const void *address)
 {
-  void *(*hook) (void *, size_t, const void *) =
-    atomic_forced_read (__realloc_hook);
-  if (__builtin_expect (hook != NULL, 0))
-    {
-      *victimp = (*hook)(*oldmem, *bytesp, address);
-      return true;
-    }
-
   if (__glibc_unlikely (__malloc_debugging_hooks))
     {
       if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -194,13 +231,6 @@ static __always_inline bool
 _memalign_debug_before (size_t alignment, size_t *bytesp, void **victimp,
 			const void *address)
 {
-  void *(*hook) (size_t, size_t, const void *) =
-    atomic_forced_read (__memalign_hook);
-  if (__builtin_expect (hook != NULL, 0))
-    {
-      *victimp = (*hook)(alignment, *bytesp, address);
-      return true;
-    }
   if (__glibc_unlikely (__malloc_debugging_hooks))
     {
       if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -233,18 +263,6 @@ _memalign_debug_after (void *mem, size_t alignment, size_t bytes,
 static __always_inline bool
 _calloc_debug_before (size_t *bytesp, void **victimp, const void *address)
 {
-  void *(*hook) (size_t, const void *) =
-    atomic_forced_read (__malloc_hook);
-  if (__builtin_expect (hook != NULL, 0))
-    {
-      *victimp = (*hook)(*bytesp, address);
-
-      if (*victimp != NULL)
-	memset (*victimp, 0, *bytesp);
-
-      return true;
-    }
-
   /* Memory is zeroed out in the AFTER hook.  */
   if (__glibc_unlikely (__malloc_debugging_hooks))
     {
diff --git a/malloc/malloc-compathooks.c b/malloc/malloc-compathooks.c
new file mode 100644
index 0000000000..6d1eaab774
--- /dev/null
+++ b/malloc/malloc-compathooks.c
@@ -0,0 +1,166 @@
+/* Malloc hooks compatibility DSO.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
+
+#include <atomic.h>
+#include <libc-symbols.h>
+#include <shlib-compat.h>
+#include <string.h>
+#include <unistd.h>
+
+extern void (*__free_hook) (void *__ptr, const void *);
+compat_symbol_reference (libc, __free_hook, __free_hook, GLIBC_2_0);
+extern void * (*__malloc_hook) (size_t __size, const void *);
+compat_symbol_reference (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
+extern void * (*__realloc_hook)
+     (void *__ptr, size_t __size, const void *);
+compat_symbol_reference (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
+extern void * (*__memalign_hook)
+  (size_t __alignment, size_t __size, const void *);
+compat_symbol_reference (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
+
+/* Support only the glibc allocators.  */
+extern void *__libc_malloc (size_t);
+extern void __libc_free (void *);
+extern void *__libc_realloc (void *, size_t);
+extern void *__libc_memalign (size_t, size_t);
+extern void *__libc_valloc (size_t);
+extern void *__libc_pvalloc (size_t);
+extern void *__libc_calloc (size_t, size_t);
+
+static size_t pagesize;
+
+/* The allocator functions.  */
+
+static void *
+__compathook_malloc (size_t bytes)
+{
+  void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    return (*hook)(bytes, RETURN_ADDRESS (0));
+
+  return __libc_malloc (bytes);
+}
+strong_alias (__compathook_malloc, malloc)
+
+static void
+__compathook_free (void *mem)
+{
+  void (*hook) (void *, const void *) = atomic_forced_read (__free_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    {
+      (*hook)(mem, RETURN_ADDRESS (0));
+      return;
+    }
+  __libc_free (mem);
+}
+strong_alias (__compathook_free, free)
+
+static void *
+__compathook_realloc (void *oldmem, size_t bytes)
+{
+  void *(*hook) (void *, size_t, const void *) =
+    atomic_forced_read (__realloc_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    return (*hook)(oldmem, bytes, RETURN_ADDRESS (0));
+
+  return __libc_realloc (oldmem, bytes);
+}
+strong_alias (__compathook_realloc, realloc)
+
+static void *
+__compathook_memalign (size_t alignment, size_t bytes)
+{
+  void *(*hook) (size_t, size_t, const void *) =
+    atomic_forced_read (__memalign_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    return (*hook)(alignment, bytes, RETURN_ADDRESS (0));
+
+  return __libc_memalign (alignment, bytes);
+}
+strong_alias (__compathook_memalign, memalign)
+
+static void *
+__compathook_pvalloc (size_t bytes)
+{
+  void *(*hook) (size_t, size_t, const void *) =
+    atomic_forced_read (__memalign_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    {
+      size_t rounded_bytes;
+
+      if (!pagesize)
+	pagesize = sysconf (_SC_PAGESIZE);
+
+      /* ALIGN_UP with overflow check.  */
+      if (__glibc_unlikely (__builtin_add_overflow (bytes,
+						    pagesize - 1,
+						    &rounded_bytes)))
+	{
+	  errno = ENOMEM;
+	  return NULL;
+	}
+      rounded_bytes = rounded_bytes & -(pagesize - 1);
+      return (*hook)(pagesize, rounded_bytes, RETURN_ADDRESS (0));
+    }
+
+  return __libc_pvalloc (bytes);
+}
+strong_alias (__compathook_pvalloc, pvalloc)
+
+static void *
+__compathook_valloc (size_t bytes)
+{
+  void *(*hook) (size_t, size_t, const void *) =
+    atomic_forced_read (__memalign_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    {
+      if (!pagesize)
+	pagesize = sysconf (_SC_PAGESIZE);
+
+      return (*hook)(pagesize, bytes, RETURN_ADDRESS (0));
+    }
+
+  return __libc_valloc (bytes);
+}
+strong_alias (__compathook_valloc, valloc)
+
+static void *
+__compathook_calloc (size_t nmemb, size_t size)
+{
+  void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
+  if (__builtin_expect (hook != NULL, 0))
+    {
+      size_t bytes;
+
+      if (__glibc_unlikely (__builtin_mul_overflow (nmemb, size, &bytes)))
+	{
+	  errno = ENOMEM;
+	  return NULL;
+	}
+
+      void *mem = (*hook)(bytes, RETURN_ADDRESS (0));
+
+      if (mem != NULL)
+	memset (mem, 0, bytes);
+
+      return mem;
+    }
+
+  return __libc_calloc (nmemb, size);
+}
+strong_alias (__compathook_calloc, calloc)
diff --git a/malloc/malloc.c b/malloc/malloc.c
index c899619e50..f6d7309721 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -570,16 +570,6 @@ tag_at (void *ptr)
 #define HAVE_MREMAP 0
 #endif
 
-/* We may need to support __malloc_initialize_hook for backwards
-   compatibility.  */
-
-#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
-# define HAVE_MALLOC_INIT_HOOK 1
-#else
-# define HAVE_MALLOC_INIT_HOOK 0
-#endif
-
-
 /*
   This version of malloc supports the standard SVID/XPG mallinfo
   routine that returns a struct containing usage properties and
diff --git a/malloc/malloc.h b/malloc/malloc.h
index c1c0896d29..709fa454b5 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -165,20 +165,6 @@ extern void malloc_stats (void) __THROW;
 extern int malloc_info (int __options, FILE *__fp) __THROW;
 
 /* Hooks for debugging and user-defined versions. */
-extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
-                                                   const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook)(size_t __size,
-                                                     const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook)(void *__ptr,
-                                                      size_t __size,
-                                                      const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
-                                                       size_t __size,
-                                                       const void *)
-__MALLOC_DEPRECATED;
 extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void)
   __MALLOC_DEPRECATED;
 
diff --git a/manual/memory.texi b/manual/memory.texi
index 28ec2e4e63..e66ecd582d 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -328,8 +328,6 @@ any time (or never).
 * Malloc Tunable Parameters::   Use @code{mallopt} to adjust allocation
                                  parameters.
 * Heap Consistency Checking::   Automatic checking for errors.
-* Hooks for Malloc::            You can use these hooks for debugging
-				 programs that use @code{malloc}.
 * Statistics of Malloc::        Getting information about how much
 				 memory your program is using.
 * Summary of Malloc::           Summary of @code{malloc} and related functions.
@@ -1388,170 +1386,6 @@ compatibility.  Both @code{MALLOC_CHECK_} and @samp{-lmcheck} should
 uncover the same bugs - but using @code{MALLOC_CHECK_} you don't need to
 recompile your application.
 
-@node Hooks for Malloc
-@subsubsection Memory Allocation Hooks
-@cindex allocation hooks, for @code{malloc}
-
-@Theglibc{} lets you modify the behavior of @code{malloc},
-@code{realloc}, and @code{free} by specifying appropriate hook
-functions.  You can use these hooks to help you debug programs that use
-dynamic memory allocation, for example.
-
-The hook variables are declared in @file{malloc.h}.
-@pindex malloc.h
-
-@defvar __malloc_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to the function that
-@code{malloc} uses whenever it is called.  You should define this
-function to look like @code{malloc}; that is, like:
-
-@smallexample
-void *@var{function} (size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{malloc} function was called.  This value allows you to trace
-the memory consumption of the program.
-@end defvar
-
-@defvar __realloc_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{realloc}
-uses whenever it is called.  You should define this function to look
-like @code{realloc}; that is, like:
-
-@smallexample
-void *@var{function} (void *@var{ptr}, size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{realloc} function was called.  This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-@defvar __free_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{free}
-uses whenever it is called.  You should define this function to look
-like @code{free}; that is, like:
-
-@smallexample
-void @var{function} (void *@var{ptr}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{free} function was called.  This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-@defvar __memalign_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{aligned_alloc},
-@code{memalign}, @code{posix_memalign} and @code{valloc} use whenever they
-are called.  You should define this function to look like @code{aligned_alloc};
-that is, like:
-
-@smallexample
-void *@var{function} (size_t @var{alignment}, size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{aligned_alloc}, @code{memalign}, @code{posix_memalign} or
-@code{valloc} functions are called.  This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-You must make sure that the function you install as a hook for one of
-these functions does not call that function recursively without restoring
-the old value of the hook first!  Otherwise, your program will get stuck
-in an infinite recursion.  Before calling the function recursively, one
-should make sure to restore all the hooks to their previous value.  When
-coming back from the recursive call, all the hooks should be resaved
-since a hook might modify itself.
-
-An issue to look out for is the time at which the hook functions
-can be safely installed.  If the hook functions call the @code{malloc}-related
-functions recursively, it is necessary that @code{malloc} has already properly
-initialized itself at the time when @code{__malloc_hook} etc. is
-assigned to.  On the other hand, if the hook functions provide a
-complete @code{malloc} implementation of their own, it is vital that the hooks
-are assigned to @emph{before} the very first @code{malloc} call has
-completed, because otherwise a chunk obtained from the ordinary,
-un-hooked @code{malloc} may later be handed to @code{__free_hook}, for example.
-
-Here is an example showing how to use @code{__malloc_hook} and
-@code{__free_hook} properly.  It installs a function that prints out
-information every time @code{malloc} or @code{free} is called.  We just
-assume here that @code{realloc} and @code{memalign} are not used in our
-program.
-
-@smallexample
-/* Prototypes for __malloc_hook, __free_hook */
-#include <malloc.h>
-
-/* Prototypes for our hooks.  */
-static void my_init_hook (void);
-static void *my_malloc_hook (size_t, const void *);
-static void my_free_hook (void*, const void *);
-
-static void
-my_init (void)
-@{
-  old_malloc_hook = __malloc_hook;
-  old_free_hook = __free_hook;
-  __malloc_hook = my_malloc_hook;
-  __free_hook = my_free_hook;
-@}
-
-static void *
-my_malloc_hook (size_t size, const void *caller)
-@{
-  void *result;
-  /* Restore all old hooks */
-  __malloc_hook = old_malloc_hook;
-  __free_hook = old_free_hook;
-  /* Call recursively */
-  result = malloc (size);
-  /* Save underlying hooks */
-  old_malloc_hook = __malloc_hook;
-  old_free_hook = __free_hook;
-  /* @r{@code{printf} might call @code{malloc}, so protect it too.} */
-  printf ("malloc (%u) returns %p\n", (unsigned int) size, result);
-  /* Restore our own hooks */
-  __malloc_hook = my_malloc_hook;
-  __free_hook = my_free_hook;
-  return result;
-@}
-
-static void
-my_free_hook (void *ptr, const void *caller)
-@{
-  /* Restore all old hooks */
-  __malloc_hook = old_malloc_hook;
-  __free_hook = old_free_hook;
-  /* Call recursively */
-  free (ptr);
-  /* Save underlying hooks */
-  old_malloc_hook = __malloc_hook;
-  old_free_hook = __free_hook;
-  /* @r{@code{printf} might call @code{free}, so protect it too.} */
-  printf ("freed pointer %p\n", ptr);
-  /* Restore our own hooks */
-  __malloc_hook = my_malloc_hook;
-  __free_hook = my_free_hook;
-@}
-
-main ()
-@{
-  my_init ();
-  @dots{}
-@}
-@end smallexample
-
-The @code{mcheck} function (@pxref{Heap Consistency Checking}) works by
-installing such hooks.
-
 @c __morecore, __after_morecore_hook are undocumented
 @c It's not clear whether to document them.
 
@@ -1686,19 +1520,6 @@ Tell @code{malloc} to perform occasional consistency checks on
 dynamically allocated memory, and to call @var{abortfn} when an
 inconsistency is found.  @xref{Heap Consistency Checking}.
 
-@item void *(*__malloc_hook) (size_t @var{size}, const void *@var{caller})
-A pointer to a function that @code{malloc} uses whenever it is called.
-
-@item void *(*__realloc_hook) (void *@var{ptr}, size_t @var{size}, const void *@var{caller})
-A pointer to a function that @code{realloc} uses whenever it is called.
-
-@item void (*__free_hook) (void *@var{ptr}, const void *@var{caller})
-A pointer to a function that @code{free} uses whenever it is called.
-
-@item void (*__memalign_hook) (size_t @var{size}, size_t @var{alignment}, const void *@var{caller})
-A pointer to a function that @code{aligned_alloc}, @code{memalign},
-@code{posix_memalign} and @code{valloc} use whenever they are called.
-
 @item struct mallinfo2 mallinfo2 (void)
 Return information about the current dynamic memory usage.
 @xref{Statistics of Malloc}.
@@ -1733,7 +1554,7 @@ penalties for the program if the debugging mode is not enabled.
 
 @deftypefun void mtrace (void)
 @standards{GNU, mcheck.h}
-@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}}
+@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}}
 @c Like the mcheck hooks, these are not designed with thread safety in
 @c mind, because the hook pointers are temporarily modified without
 @c regard to other threads, signals or cancellation.
@@ -1758,10 +1579,10 @@ with the SUID or SGID bit set.
 
 If the named file is successfully opened, @code{mtrace} installs special
 handlers for the functions @code{malloc}, @code{realloc}, and
-@code{free} (@pxref{Hooks for Malloc}).  From then on, all uses of these
-functions are traced and protocolled into the file.  There is now of
-course a speed penalty for all calls to the traced functions so tracing
-should not be enabled during normal use.
+@code{free}.  From then on, all uses of these functions are traced and
+protocolled into the file.  There is now of course a speed penalty for all
+calls to the traced functions so tracing should not be enabled during normal
+use.
 
 This function is a GNU extension and generally not available on other
 systems.  The prototype can be found in @file{mcheck.h}.
@@ -1769,7 +1590,7 @@ systems.  The prototype can be found in @file{mcheck.h}.
 
 @deftypefun void muntrace (void)
 @standards{GNU, mcheck.h}
-@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}}
+@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}}
 
 @c muntrace @mtasurace:mtrace @mtslocale @asucorrupt @ascuheap @acucorrupt @acsmem @aculock @acsfd
 @c  fprintf (fputs) dup @mtslocale @asucorrupt @ascuheap @acsmem @aculock @acucorrupt
diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data
index 9b4f35786a..e2083c0ce6 100644
--- a/sysdeps/generic/localplt.data
+++ b/sysdeps/generic/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/mach/hurd/i386/localplt.data b/sysdeps/mach/hurd/i386/localplt.data
index 47fbe1e2a7..94064ecbc5 100644
--- a/sysdeps/mach/hurd/i386/localplt.data
+++ b/sysdeps/mach/hurd/i386/localplt.data
@@ -6,6 +6,7 @@
 libc.so: calloc + REL R_386_GLOB_DAT
 libc.so: free + REL R_386_GLOB_DAT
 libc.so: malloc + REL R_386_GLOB_DAT
+libc.so: memalign + REL R_386_GLOB_DAT
 libc.so: realloc + REL R_386_GLOB_DAT
 libm.so: matherr + REL R_386_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/aarch64/localplt.data b/sysdeps/unix/sysv/linux/aarch64/localplt.data
index 348b3f3793..2c14b652ef 100644
--- a/sysdeps/unix/sysv/linux/aarch64/localplt.data
+++ b/sysdeps/unix/sysv/linux/aarch64/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # If outline atomics are used, libgcc (built outside of glibc) may
diff --git a/sysdeps/unix/sysv/linux/alpha/localplt.data b/sysdeps/unix/sysv/linux/alpha/localplt.data
index 44bf36f4f1..43f6fdaea1 100644
--- a/sysdeps/unix/sysv/linux/alpha/localplt.data
+++ b/sysdeps/unix/sysv/linux/alpha/localplt.data
@@ -18,6 +18,7 @@ libc.so: _Unwind_Find_FDE
 libc.so: calloc + RELA R_ALPHA_GLOB_DAT
 libc.so: free + RELA R_ALPHA_GLOB_DAT
 libc.so: malloc + RELA R_ALPHA_GLOB_DAT
+libc.so: memalign + RELA R_ALPHA_GLOB_DAT
 libc.so: realloc + RELA R_ALPHA_GLOB_DAT
 libm.so: matherr + RELA R_ALPHA_GLOB_DAT
 # We used to offer inline functions that used this, so it must be exported.
diff --git a/sysdeps/unix/sysv/linux/arc/localplt.data b/sysdeps/unix/sysv/linux/arc/localplt.data
index ac5332caf7..4479e8ee8a 100644
--- a/sysdeps/unix/sysv/linux/arc/localplt.data
+++ b/sysdeps/unix/sysv/linux/arc/localplt.data
@@ -1,5 +1,6 @@
 libc.so: realloc
 libc.so: malloc
+libc.so: memalign
 libc.so: calloc
 libc.so: free
 # At -Os, a struct assignment in libgcc-static pulls this in
diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data
index 78896444c6..eb315da2f1 100644
--- a/sysdeps/unix/sysv/linux/arm/localplt.data
+++ b/sysdeps/unix/sysv/linux/arm/localplt.data
@@ -1,6 +1,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: raise
 libc.so: realloc
 libm.so: matherr
diff --git a/sysdeps/unix/sysv/linux/csky/localplt.data b/sysdeps/unix/sysv/linux/csky/localplt.data
index 817ab2659a..0ed8650b65 100644
--- a/sysdeps/unix/sysv/linux/csky/localplt.data
+++ b/sysdeps/unix/sysv/linux/csky/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 # The TLS-enabled version of these functions is interposed from libc.so.
 ld.so: _dl_signal_error
diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data
index baf857a750..09893d4dcf 100644
--- a/sysdeps/unix/sysv/linux/hppa/localplt.data
+++ b/sysdeps/unix/sysv/linux/hppa/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libc.so: __sigsetjmp
 libc.so: _IO_funlockfile
diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data
index f9bf7fb410..5334875b4b 100644
--- a/sysdeps/unix/sysv/linux/i386/localplt.data
+++ b/sysdeps/unix/sysv/linux/i386/localplt.data
@@ -4,6 +4,7 @@ libc.so: _Unwind_Find_FDE + REL R_386_GLOB_DAT
 libc.so: calloc + REL R_386_GLOB_DAT
 libc.so: free + REL R_386_GLOB_DAT
 libc.so: malloc + REL R_386_GLOB_DAT
+libc.so: memalign + REL R_386_GLOB_DAT
 libc.so: realloc + REL R_386_GLOB_DAT
 libm.so: matherr + REL R_386_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/ia64/localplt.data b/sysdeps/unix/sysv/linux/ia64/localplt.data
index 174fb88128..1c566a503e 100644
--- a/sysdeps/unix/sysv/linux/ia64/localplt.data
+++ b/sysdeps/unix/sysv/linux/ia64/localplt.data
@@ -1,6 +1,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 libm.so: matherrf
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
index 42fa90508c..3c5efb7204 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
@@ -2,6 +2,7 @@ libc.so: __m68k_read_tp
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
index 34bd4c1aca..843f4e25f2 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
@@ -3,6 +3,7 @@ libc.so: __m68k_read_tp
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/microblaze/localplt.data b/sysdeps/unix/sysv/linux/microblaze/localplt.data
index c3801314c9..0e98d5251e 100644
--- a/sysdeps/unix/sysv/linux/microblaze/localplt.data
+++ b/sysdeps/unix/sysv/linux/microblaze/localplt.data
@@ -2,6 +2,7 @@ libc.so: __errno_location
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The dynamic loader needs __tls_get_addr for TLS.
diff --git a/sysdeps/unix/sysv/linux/nios2/localplt.data b/sysdeps/unix/sysv/linux/nios2/localplt.data
index 17fcfdd4db..b37987c7c0 100644
--- a/sysdeps/unix/sysv/linux/nios2/localplt.data
+++ b/sysdeps/unix/sysv/linux/nios2/localplt.data
@@ -6,6 +6,7 @@ libc.so: __gedf2
 libc.so: malloc
 libc.so: __gtsf2 ?
 libc.so: __nesf2
+libc.so: memalign
 libc.so: __mulsf3
 libc.so: __floatunsisf
 libc.so: __addsf3
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
index c0af84eef7..a02dd5cc24 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
@@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
index 581e54b95c..d8072597b7 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
@@ -30,6 +30,7 @@ libc.so: abort ?
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: memset ?
 libc.so: realloc
 libm.so: copysignl ?
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
index d69b7ae646..bb498fbe3a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
@@ -1,6 +1,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/riscv/localplt.data b/sysdeps/unix/sysv/linux/riscv/localplt.data
index e6d5330d5b..0a235592c3 100644
--- a/sysdeps/unix/sysv/linux/riscv/localplt.data
+++ b/sysdeps/unix/sysv/linux/riscv/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: memset ?
 libc.so: realloc
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data
index c0af84eef7..a02dd5cc24 100644
--- a/sysdeps/unix/sysv/linux/s390/localplt.data
+++ b/sysdeps/unix/sysv/linux/s390/localplt.data
@@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sh/localplt.data b/sysdeps/unix/sysv/linux/sh/localplt.data
index 6491b9e37b..3225177c50 100644
--- a/sysdeps/unix/sysv/linux/sh/localplt.data
+++ b/sysdeps/unix/sysv/linux/sh/localplt.data
@@ -4,6 +4,7 @@
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libc.so: _Unwind_Find_FDE
 libc.so: _exit
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
index 38309a1393..be51efd566 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
@@ -16,6 +16,7 @@ libc.so: _Unwind_Find_FDE
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
index 6a216f3a5a..809062d46c 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
@@ -15,6 +15,7 @@ libc.so: _Unwind_Find_FDE
 libc.so: calloc
 libc.so: free
 libc.so: malloc
+libc.so: memalign
 libc.so: realloc
 libm.so: matherr
 # The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data
index d1f2e26612..8f41e92870 100644
--- a/sysdeps/x86_64/localplt.data
+++ b/sysdeps/x86_64/localplt.data
@@ -6,6 +6,7 @@
 libc.so: calloc + RELA R_X86_64_GLOB_DAT
 libc.so: free + RELA R_X86_64_GLOB_DAT
 libc.so: malloc + RELA R_X86_64_GLOB_DAT
+libc.so: memalign + RELA R_X86_64_GLOB_DAT
 libc.so: realloc + RELA R_X86_64_GLOB_DAT
 libm.so: matherr + RELA R_X86_64_GLOB_DAT
 # The TLS-enabled version of these functions is interposed from libc.so.
