Re: OS X: Segfault adding ligature

[I only subscribed to the mailing list today, so I’m replying to my own mail although this is a response to Frank Trampe’s and Dave Crossland’s responses]

On 21 Jan, 2014, at 22:33, Ambarish Sridharanarayanan <[email protected]> wrote:

> On 14 Jan, 2014, at 19:52, Ambarish Sridharanarayanan <[email protected]> wrote:
> 
>> I’m running fontforge 20131122, libfontforge 20131122-ML on OS X Mavericks. I’m trying to add a ligature to an Indic font for the Grantha script. The target of any ligature I add (through Glyph Info) ends up being a .notdef in the table, If I then go to Font Info, Lookups, go into the sub-table, Edit Data and try to fix the Ligature Glyph Name, FontForge crashes when I hit ‘OK’, with a Segmentation Fault, with the following output:
>> 
>> MakeTemporaryFile() fd:28 template:/var/folders/_j/jr2f9sf110l_ylyy7mchm95h0000gp/T//fontforge-stemp-H83T9W
>> Failed to read a file. Bytes read:0 file size:0
>> /Applications/FontForge.app/Contents/MacOS/FontForge: line 64:   699 Segmentation fault: 11  $WRAPPER $bundle_bin/fontforge -new "$@"
>> 
>> Here are repro steps:
>> 
>> * Download file from the link below (you may need a modern browser + JS)
>> http://sdrv.ms/1fwqunc
>> * Go to Element → Font Info
>> * Go to Lookups
>> * Open the <1, 0> Required Ligatures table
>> * Select the only sub-table and click Edit Data
>> * Notice the 2 ligatures are both .notdef
>> * Try to fix up the Ligature glyph-names by editing the first notdef, typing in ‘uniE00C’
>> * Click OK
>> * CRASH!

I managed to reproduce the crash in the newer version Dave suggested, in debug mode (under script/lldb/...).

MBP:/Users/ambarish> /Applications/FontForge.app/Contents/MacOS/FontForge --version
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Executable based on sources from 04:16 EST 23-Jan-2014-ML-D.
 Library based on sources from 04:16 EST 23-Jan-2014.
 Based on source from git with hash:aa5b99b44eb37b38a1876a6fa3f8dc1a5099bbc9
fontforge 20140123
libfontforge 20140123-ML

The FontForge-Debug-Output is in the text file in my Public SkyDrive:

https://skydrive.live.com/?cid=96eb26ec94925919&id=96EB26EC94925919%2119966

And here’s the call-stack from lldb (also in the debug trace)

(lldb) thread backtrace
* thread #1: tid = 0xb9a7, 0x00007fff9185a812 libsystem_c.dylib`strlen + 18, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00007fff9185a812 libsystem_c.dylib`strlen + 18
    frame #1: 0x0000000100735eda libgutils.2.dylib`GFileWriteAll + 24
    frame #2: 0x00000001000ed1db libfontforgeexe.2.dylib`PSTKD_Ok + 1850
    frame #3: 0x000000010034de90 libgdraw.5.dylib`GButtonInvoked + 253
    frame #4: 0x000000010034c6e6 libgdraw.5.dylib`gbutton_mouse + 348
    frame #5: 0x0000000100352fc3 libgdraw.5.dylib`_GWidget_Container_eh + 717
    frame #6: 0x0000000100353a87 libgdraw.5.dylib`_GWidget_TopLevel_eh + 1355
    frame #7: 0x0000000100395c9e libgdraw.5.dylib`dispatchEvent + 5520
    frame #8: 0x0000000100393482 libgdraw.5.dylib`GXDrawProcessOneEvent + 60
    frame #9: 0x00000001000e908e libfontforgeexe.2.dylib`_LookupSubtableContents + 14113
    frame #10: 0x00000001000b4192 libfontforgeexe.2.dylib`GFI_LookupEditSubtableContents + 65
    frame #11: 0x000000010034de90 libgdraw.5.dylib`GButtonInvoked + 253
    frame #12: 0x000000010034c6e6 libgdraw.5.dylib`gbutton_mouse + 348
    frame #13: 0x0000000100352fc3 libgdraw.5.dylib`_GWidget_Container_eh + 717
    frame #14: 0x0000000100395c9e libgdraw.5.dylib`dispatchEvent + 5520
    frame #15: 0x00000001003934d1 libgdraw.5.dylib`GXDrawEventLoop + 65
    frame #16: 0x0000000100160217 libfontforgeexe.2.dylib`fontforge_main + 6853
    frame #17: 0x000000010000df2c fontforge`start + 52

Should I go ahead and file a bug? Is this an issue with the Mac build?
Ambarish

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