FAQ
In addition to the gdFreeFontCache segfault I sent yesterday, here is an
imagettfbbox() crash. I am starting to wonder if we have a basic
incompatibility with the current freetype lib. This is PHP_4_3 on a
Debian box with:

ii libfreetype6-dev 2.1.3+2.1.4rc2-4 FreeType 2 font engine, development files

Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
#1 0x407280da in FT_Alloc () from /usr/lib/libfreetype.so.6
#2 0x4072a6d5 in ft_validator_error () from /usr/lib/libfreetype.so.6
#3 0x4072b3d5 in FT_Open_Face () from /usr/lib/libfreetype.so.6
#4 0x4072b31f in FT_New_Face () from /usr/lib/libfreetype.so.6
#5 0x4044413e in fontFetch (error=0x814c448, key=0xbfffca78) at /home/rasmus/php4/ext/gd/libgd/gdft.c:445
#6 0x40445529 in gdCacheGet (head=0x814c440, keydata=0xbfffca78) at /home/rasmus/php4/ext/gd/libgd/gdcache.c:120
#7 0x40444a20 in gdImageStringFTEx (im=0x0, brect=0xbfffcba0, fg=-1, fontlist=0x814a838 "", ptsize=12, angle=0, x=-1, y=-1, string=0x814c604 "bar", strex=0x4059d480)
at /home/rasmus/php4/ext/gd/libgd/gdft.c:823
#8 0x404448c9 in gdImageStringFT (im=0x0, brect=0xbfffcba0, fg=-1, fontlist=0x814c61c "handwriting", ptsize=12, angle=0, x=-1, y=-1, string=0x814c604 "bar")
at /home/rasmus/php4/ext/gd/libgd/gdft.c:766
#9 0x40438c9f in php_imagettftext_common (ht=-1073756072, return_value=0x814f5b4, this_ptr=0x0, return_value_used=1, mode=1, extended=0) at /home/rasmus/php4/ext/gd/gd.c:3039
#10 0x4043880f in zif_imagettfbbox (ht=4, return_value=0x814f5b4, this_ptr=0x0, return_value_used=1) at /home/rasmus/php4/ext/gd/gd.c:2920
#11 0x40530f7e in execute (op_array=0x81448ac) at /home/rasmus/php4/Zend/zend_execute.c:1606
#12 0x405247fb in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/rasmus/php4/Zend/zend.c:864
#13 0x404ff217 in php_execute_script (primary_file=0xbffff810) at /home/rasmus/php4/main/main.c:1651
#14 0x40534b8e in apache_php_module_main (r=0x813c254, display_source_mode=0) at /home/rasmus/php4/sapi/apache/sapi_apache.c:55
#15 0x40535617 in send_php (r=0x813c254, display_source_mode=0, filename=0x0) at /home/rasmus/php4/sapi/apache/mod_php4.c:617
#16 0x405357b6 in send_parsed_php (r=0x813c254) at /home/rasmus/php4/sapi/apache/mod_php4.c:632
#17 0x08053b34 in ap_invoke_handler ()
#18 0x0806368c in ap_some_auth_required ()
#19 0x080636e8 in ap_process_request ()
#20 0x0805ce2b in ap_child_terminate ()
#21 0x0805cfbc in ap_child_terminate ()
#22 0x0805d0d9 in ap_child_terminate ()
#23 0x0805d5b5 in ap_child_terminate ()
#24 0x0805dcbd in main ()
#25 0x400e2a51 in __libc_start_main () from /lib/libc.so.6

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  • Ilia A. at Mar 30, 2003 at 9:01 pm

    On March 30, 2003 01:19 pm, Rasmus Lerdorf wrote:
    I am starting to wonder if we have a basic
    incompatibility with the current freetype lib. This is PHP_4_3 on a
    Debian box with:

    ii libfreetype6-dev 2.1.3+2.1.4rc2-4
    FreeType 2 font engine, development files
    I use libfreetype.so.6.3.2 and have not encountered such problems, is there a
    way to see the actual PHP script, which causes this crash?

    Ilia
  • Rasmus Lerdorf at Mar 30, 2003 at 9:32 pm
    Here is the script:

    <?php
    $text = urldecode(substr($PATH_INFO,1));

    $font = 'handwriting';
    if(!$size) $size = 12;
    $im = ImageCreateFromPNG('button.png');
    $tsize = imagettfbbox($size,0,$font,$text);
    $dx = abs($tsize[2]-$tsize[0]);
    $dy = abs($tsize[5]-$tsize[3]);
    $x = ( imagesx($im) - $dx ) / 2;
    $y = ( imagesy($im) - $dy ) / 2 + $dy;
    $black = ImageColorAllocate($im,0,0,0);
    ImageAlphaBlending($im, true);
    ImageTTFText($im, $size, 0, $x, $y, $black, $font, $text);
    Header('Content-type: image/png');
    ImagePNG($im);
    ?>

    That button.png image is here: http://lerdorf.com/images/button.png
    And I have put the handwriting.ttf file at lerdorf.com/handwriting.ttf

    I get the RSHUTDOWN crash on about 30% of the hits to that script and the
    imagettfbbox() crash very infrequently.

    -Rasmus
    On Sun, 30 Mar 2003, Ilia A. wrote:
    On March 30, 2003 01:19 pm, Rasmus Lerdorf wrote:
    I am starting to wonder if we have a basic
    incompatibility with the current freetype lib. This is PHP_4_3 on a
    Debian box with:

    ii libfreetype6-dev 2.1.3+2.1.4rc2-4
    FreeType 2 font engine, development files
    I use libfreetype.so.6.3.2 and have not encountered such problems, is there a
    way to see the actual PHP script, which causes this crash?

    Ilia

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postedMar 30, '03 at 6:19p
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