[mituharu@math.s.chiba-u.ac.jp: Re: emacs-22.1 with GTK dumps core when Gnome wigets clicked]

[Richard Stallman <rms@gnu.org>]

Would someone else (other that Mitsuharu) please study this
patch to check whether it is really correct?  Things like this
can be tricky.

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Date: Thu, 14 Jun 2007 11:16:30 +0900
From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: Gary Mills <mills@cc.umanitoba.ca>
In-Reply-To: <20070610141003.GA12085@cc.umanitoba.ca>
Organization: Faculty of Science, Chiba University
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Cc: bug-gnu-emacs@gnu.org
Subject: Re: emacs-22.1 with GTK dumps core when Gnome wigets clicked

I found a possible problem, which may or may not be relevant to this
issue, in the initialization of the recursive mutex in src/gmalloc.c.
Could you try this patch?

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp

Index: src/gmalloc.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/gmalloc.c,v
retrieving revision 1.21
diff -c -p -r1.21 gmalloc.c
*** src/gmalloc.c	28 Mar 2007 08:16:05 -0000	1.21
- --- src/gmalloc.c	14 Jun 2007 02:03:33 -0000
*************** extern __malloc_size_t _bytes_free;
*** 235,240 ****
- --- 235,243 ----
  extern __ptr_t _malloc_internal PP ((__malloc_size_t __size));
  extern __ptr_t _realloc_internal PP ((__ptr_t __ptr, __malloc_size_t __size));
  extern void _free_internal PP ((__ptr_t __ptr));
+ extern __ptr_t _malloc_internal_nolock PP ((__malloc_size_t __size));
+ extern __ptr_t _realloc_internal_nolock PP ((__ptr_t __ptr, __malloc_size_t __size));
+ extern void _free_internal_nolock PP ((__ptr_t __ptr));
  
  #ifdef USE_PTHREAD
  extern pthread_mutex_t _malloc_mutex;
*************** register_heapinfo ()
*** 554,560 ****
  
  #ifdef USE_PTHREAD
  static pthread_once_t malloc_init_once_control = PTHREAD_ONCE_INIT;
! pthread_mutex_t _malloc_mutex;
  #endif
  
  static void
- --- 557,563 ----
  
  #ifdef USE_PTHREAD
  static pthread_once_t malloc_init_once_control = PTHREAD_ONCE_INIT;
! pthread_mutex_t _malloc_mutex = PTHREAD_MUTEX_INITIALIZER;
  #endif
  
  static void
*************** malloc_initialize_1 ()
*** 567,573 ****
    if (__malloc_initialize_hook)
      (*__malloc_initialize_hook) ();
  
! #ifdef USE_PTHREAD
    {
      pthread_mutexattr_t attr;
  
- --- 570,578 ----
    if (__malloc_initialize_hook)
      (*__malloc_initialize_hook) ();
  
!   /* We don't use recursive mutex because pthread_mutexattr_init may
!      call malloc internally.  */
! #if 0 /* defined (USE_PTHREAD) */
    {
      pthread_mutexattr_t attr;
  
*************** morecore (size)
*** 661,667 ****
  	     `morecore_recursing' flag and return null.  */
  	  int save = errno;	/* Don't want to clobber errno with ENOMEM.  */
  	  morecore_recursing = 1;
! 	  newinfo = (malloc_info *) _realloc_internal
  	    (_heapinfo, newsize * sizeof (malloc_info));
  	  morecore_recursing = 0;
  	  if (newinfo == NULL)
- --- 666,672 ----
  	     `morecore_recursing' flag and return null.  */
  	  int save = errno;	/* Don't want to clobber errno with ENOMEM.  */
  	  morecore_recursing = 1;
! 	  newinfo = (malloc_info *) _realloc_internal_nolock
  	    (_heapinfo, newsize * sizeof (malloc_info));
  	  morecore_recursing = 0;
  	  if (newinfo == NULL)
*************** morecore (size)
*** 717,723 ****
        /* Reset _heaplimit so _free_internal never decides
  	 it can relocate or resize the info table.  */
        _heaplimit = 0;
!       _free_internal (oldinfo);
        PROTECT_MALLOC_STATE (0);
  
        /* The new heap limit includes the new table just allocated.  */
- --- 722,728 ----
        /* Reset _heaplimit so _free_internal never decides
  	 it can relocate or resize the info table.  */
        _heaplimit = 0;
!       _free_internal_nolock (oldinfo);
        PROTECT_MALLOC_STATE (0);
  
        /* The new heap limit includes the new table just allocated.  */
*************** morecore (size)
*** 732,738 ****
  
  /* Allocate memory from the heap.  */
  __ptr_t
! _malloc_internal (size)
       __malloc_size_t size;
  {
    __ptr_t result;
- --- 737,743 ----
  
  /* Allocate memory from the heap.  */
  __ptr_t
! _malloc_internal_nolock (size)
       __malloc_size_t size;
  {
    __ptr_t result;
*************** _malloc_internal (size)
*** 752,758 ****
      return NULL;
  #endif
  
- -   LOCK ();
    PROTECT_MALLOC_STATE (0);
  
    if (size < sizeof (struct list))
- --- 757,762 ----
*************** _malloc_internal (size)
*** 802,811 ****
  	  /* No free fragments of the desired size, so get a new block
  	     and break it into fragments, returning the first.  */
  #ifdef GC_MALLOC_CHECK
! 	  result = _malloc_internal (BLOCKSIZE);
  	  PROTECT_MALLOC_STATE (0);
  #else
! 	  result = malloc (BLOCKSIZE);
  #endif
  	  if (result == NULL)
  	    {
- --- 806,815 ----
  	  /* No free fragments of the desired size, so get a new block
  	     and break it into fragments, returning the first.  */
  #ifdef GC_MALLOC_CHECK
! 	  result = _malloc_internal_nolock (BLOCKSIZE);
  	  PROTECT_MALLOC_STATE (0);
  #else
! 	  result = _malloc_internal_nolock (BLOCKSIZE);
  #endif
  	  if (result == NULL)
  	    {
*************** _malloc_internal (size)
*** 932,938 ****
- --- 936,954 ----
  
    PROTECT_MALLOC_STATE (1);
   out:
+   return result;
+ }
+ 
+ __ptr_t
+ _malloc_internal (size)
+      __malloc_size_t size;
+ {
+   __ptr_t result;
+ 
+   LOCK ();
+   result = _malloc_internal_nolock (size);
    UNLOCK ();
+ 
    return result;
  }
  
*************** void (*__free_hook) PP ((__ptr_t __ptr))
*** 1024,1032 ****
  struct alignlist *_aligned_blocks = NULL;
  
  /* Return memory to the heap.
!    Like `free' but don't call a __free_hook if there is one.  */
  void
! _free_internal (ptr)
       __ptr_t ptr;
  {
    int type;
- --- 1040,1048 ----
  struct alignlist *_aligned_blocks = NULL;
  
  /* Return memory to the heap.
!    Like `_free_internal' but don't lock mutex.  */
  void
! _free_internal_nolock (ptr)
       __ptr_t ptr;
  {
    int type;
*************** _free_internal (ptr)
*** 1043,1049 ****
    if (ptr == NULL)
      return;
  
- -   LOCK ();
    PROTECT_MALLOC_STATE (0);
  
    for (l = _aligned_blocks; l != NULL; l = l->next)
- --- 1059,1064 ----
*************** _free_internal (ptr)
*** 1158,1164 ****
  		 table's blocks to the system before we have copied them to
  		 the new location.  */
  	      _heaplimit = 0;
! 	      _free_internal (_heapinfo);
  	      _heaplimit = oldlimit;
  
  	      /* Tell malloc to search from the beginning of the heap for
- --- 1173,1179 ----
  		 table's blocks to the system before we have copied them to
  		 the new location.  */
  	      _heaplimit = 0;
! 	      _free_internal_nolock (_heapinfo);
  	      _heaplimit = oldlimit;
  
  	      /* Tell malloc to search from the beginning of the heap for
*************** _free_internal (ptr)
*** 1166,1173 ****
  	      _heapindex = 0;
  
  	      /* Allocate new space for the info table and move its data.  */
! 	      newinfo = (malloc_info *) _malloc_internal (info_blocks
! 							  * BLOCKSIZE);
  	      PROTECT_MALLOC_STATE (0);
  	      memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE);
  	      _heapinfo = newinfo;
- --- 1181,1188 ----
  	      _heapindex = 0;
  
  	      /* Allocate new space for the info table and move its data.  */
! 	      newinfo = (malloc_info *) _malloc_internal_nolock (info_blocks
! 								 * BLOCKSIZE);
  	      PROTECT_MALLOC_STATE (0);
  	      memmove (newinfo, _heapinfo, info_blocks * BLOCKSIZE);
  	      _heapinfo = newinfo;
*************** _free_internal (ptr)
*** 1231,1239 ****
  	  _bytes_free -= BLOCKSIZE;
  
  #ifdef GC_MALLOC_CHECK
! 	  _free_internal (ADDRESS (block));
  #else
! 	  free (ADDRESS (block));
  #endif
  	}
        else if (_heapinfo[block].busy.info.frag.nfree != 0)
- --- 1246,1254 ----
  	  _bytes_free -= BLOCKSIZE;
  
  #ifdef GC_MALLOC_CHECK
! 	  _free_internal_nolock (ADDRESS (block));
  #else
! 	  _free_internal_nolock (ADDRESS (block));
  #endif
  	}
        else if (_heapinfo[block].busy.info.frag.nfree != 0)
*************** _free_internal (ptr)
*** 1269,1274 ****
- --- 1284,1299 ----
      }
  
    PROTECT_MALLOC_STATE (1);
+ }
+ 
+ /* Return memory to the heap.
+    Like `free' but don't call a __free_hook if there is one.  */
+ void
+ _free_internal (ptr)
+      __ptr_t ptr;
+ {
+   LOCK ();
+   _free_internal_nolock (ptr);
    UNLOCK ();
  }
  
*************** __ptr_t (*__realloc_hook) PP ((__ptr_t _
*** 1415,1421 ****
     new region.  This module has incestuous knowledge of the
     internals of both free and malloc. */
  __ptr_t
! _realloc_internal (ptr, size)
       __ptr_t ptr;
       __malloc_size_t size;
  {
- --- 1440,1446 ----
     new region.  This module has incestuous knowledge of the
     internals of both free and malloc. */
  __ptr_t
! _realloc_internal_nolock (ptr, size)
       __ptr_t ptr;
       __malloc_size_t size;
  {
*************** _realloc_internal (ptr, size)
*** 1425,1439 ****
  
    if (size == 0)
      {
!       _free_internal (ptr);
!       return _malloc_internal (0);
      }
    else if (ptr == NULL)
!     return _malloc_internal (size);
  
    block = BLOCK (ptr);
  
- -   LOCK ();
    PROTECT_MALLOC_STATE (0);
  
    type = _heapinfo[block].busy.type;
- --- 1450,1463 ----
  
    if (size == 0)
      {
!       _free_internal_nolock (ptr);
!       return _malloc_internal_nolock (0);
      }
    else if (ptr == NULL)
!     return _malloc_internal_nolock (size);
  
    block = BLOCK (ptr);
  
    PROTECT_MALLOC_STATE (0);
  
    type = _heapinfo[block].busy.type;
*************** _realloc_internal (ptr, size)
*** 1443,1453 ****
        /* Maybe reallocate a large block to a small fragment.  */
        if (size <= BLOCKSIZE / 2)
  	{
! 	  result = _malloc_internal (size);
  	  if (result != NULL)
  	    {
  	      memcpy (result, ptr, size);
! 	      _free_internal (ptr);
  	      goto out;
  	    }
  	}
- --- 1467,1477 ----
        /* Maybe reallocate a large block to a small fragment.  */
        if (size <= BLOCKSIZE / 2)
  	{
! 	  result = _malloc_internal_nolock (size);
  	  if (result != NULL)
  	    {
  	      memcpy (result, ptr, size);
! 	      _free_internal_nolock (ptr);
  	      goto out;
  	    }
  	}
*************** _realloc_internal (ptr, size)
*** 1467,1473 ****
  	     Now we will free this chunk; increment the statistics counter
  	     so it doesn't become wrong when _free_internal decrements it.  */
  	  ++_chunks_used;
! 	  _free_internal (ADDRESS (block + blocks));
  	  result = ptr;
  	}
        else if (blocks == _heapinfo[block].busy.info.size)
- --- 1491,1497 ----
  	     Now we will free this chunk; increment the statistics counter
  	     so it doesn't become wrong when _free_internal decrements it.  */
  	  ++_chunks_used;
! 	  _free_internal_nolock (ADDRESS (block + blocks));
  	  result = ptr;
  	}
        else if (blocks == _heapinfo[block].busy.info.size)
*************** _realloc_internal (ptr, size)
*** 1482,1489 ****
  	  /* Prevent free from actually returning memory to the system.  */
  	  oldlimit = _heaplimit;
  	  _heaplimit = 0;
! 	  _free_internal (ptr);
! 	  result = _malloc_internal (size);
  	  PROTECT_MALLOC_STATE (0);
  	  if (_heaplimit == 0)
  	    _heaplimit = oldlimit;
- --- 1506,1513 ----
  	  /* Prevent free from actually returning memory to the system.  */
  	  oldlimit = _heaplimit;
  	  _heaplimit = 0;
! 	  _free_internal_nolock (ptr);
! 	  result = _malloc_internal_nolock (size);
  	  PROTECT_MALLOC_STATE (0);
  	  if (_heaplimit == 0)
  	    _heaplimit = oldlimit;
*************** _realloc_internal (ptr, size)
*** 1493,1505 ****
  		 the thing we just freed.  Unfortunately it might
  		 have been coalesced with its neighbors.  */
  	      if (_heapindex == block)
! 	        (void) _malloc_internal (blocks * BLOCKSIZE);
  	      else
  		{
  		  __ptr_t previous
! 		    = _malloc_internal ((block - _heapindex) * BLOCKSIZE);
! 		  (void) _malloc_internal (blocks * BLOCKSIZE);
! 		  _free_internal (previous);
  		}
  	      goto out;
  	    }
- --- 1517,1529 ----
  		 the thing we just freed.  Unfortunately it might
  		 have been coalesced with its neighbors.  */
  	      if (_heapindex == block)
! 	        (void) _malloc_internal_nolock (blocks * BLOCKSIZE);
  	      else
  		{
  		  __ptr_t previous
! 		    = _malloc_internal_nolock ((block - _heapindex) * BLOCKSIZE);
! 		  (void) _malloc_internal_nolock (blocks * BLOCKSIZE);
! 		  _free_internal_nolock (previous);
  		}
  	      goto out;
  	    }
*************** _realloc_internal (ptr, size)
*** 1519,1536 ****
  	{
  	  /* The new size is different; allocate a new space,
  	     and copy the lesser of the new size and the old. */
! 	  result = _malloc_internal (size);
  	  if (result == NULL)
  	    goto out;
  	  memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type));
! 	  _free_internal (ptr);
  	}
        break;
      }
  
    PROTECT_MALLOC_STATE (1);
   out:
    UNLOCK ();
    return result;
  }
  
- --- 1543,1573 ----
  	{
  	  /* The new size is different; allocate a new space,
  	     and copy the lesser of the new size and the old. */
! 	  result = _malloc_internal_nolock (size);
  	  if (result == NULL)
  	    goto out;
  	  memcpy (result, ptr, min (size, (__malloc_size_t) 1 << type));
! 	  _free_internal_nolock (ptr);
  	}
        break;
      }
  
    PROTECT_MALLOC_STATE (1);
   out:
+   return result;
+ }
+ 
+ __ptr_t
+ _realloc_internal (ptr, size)
+      __ptr_t ptr;
+      __malloc_size_t size;
+ {
+   __ptr_t result;
+ 
+   LOCK();
+   result = _realloc_internal_nolock (ptr, size);
    UNLOCK ();
+ 
    return result;
  }
  


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