Hello, I have made an attempt to track down the cause of this bug. After bzr revert -r 103045 Emacs builds when I configure it with ./configure --enable-checking=xmallocoverrun --with-ns CFLAGS='-g3 -O0' After bzr revert -r 103046 the error "temacs(74585,0x7fff70e01ca0) malloc: *** error for object 0x100768010: Non-aligned pointer being freed (2)" occurs during the call to "`/bin/pwd`/temacs --batch --load loadup bootstrap." The changes made in revision 103046 are as follows: === modified file 'src/ChangeLog' --- src/ChangeLog 2011-01-30 23:34:18 +0000 +++ src/ChangeLog 2011-01-31 07:34:45 +0000 @@ -1,3 +1,8 @@ +2011-01-31 Jim Meyering + + * charset.c (load_charset_map): Don't deref NULL on failed malloc. + Use xmalloc rather than malloc. + 2011-01-30 Paul Eggert strftime: import from gnulib === modified file 'src/charset.c' --- src/charset.c 2011-01-25 04:08:28 +0000 +++ src/charset.c 2011-01-31 07:34:45 +0000 @@ -292,7 +292,7 @@ else { if (! temp_charset_work) - temp_charset_work = malloc (sizeof (*temp_charset_work)); + temp_charset_work = xmalloc (sizeof (*temp_charset_work)); if (control_flag == 1) { memset (temp_charset_work->table.decoder, -1,