Bug 506840

Summary:	Problem in freetype causes navit to crash unless freetype is built with -fno-strict-aliasing
Product:	[Fedora] Fedora	Reporter:	Adam Williamson <awilliam>
Component:	freetype	Assignee:	Behdad Esfahbod <behdad>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	rawhide	CC:	behdad, fonts-bugs, kevin, martin-s, udovdh
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-07-29 16:54:55 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Adam Williamson 2009-06-18 20:55:45 UTC

I encountered a problem running SVN navit (a GPS navigation app) on F11 and then Rawhide; it would crash as soon as it tried to render any text.

I reported this upstream, and the upstream developer Martin Schaller very kindly investigated this extensively. He was able to isolate it to a problem in freetype. I quote:

"I think I got something
<cp15> Can you find out what compiler flags are used to compile freetype on redhat?
<cp15> Because it seems freetype exibits a bug when compiled without -fno-strict-aliasing
...
<adamw> OK...so this is really a bug in freetype we should report and get fixed, building with -fno-strict-aliasing is just a workaround, right?
<cp15> Well... Hmm... without -fno-strict-aliasing gcc makes some optimizations which are probably not expected by freetype. Hard to say where the bug is
<adamw> yes! that does the trick indeed
 ok, so...file a bug on freetype. can you give me some more details to include? do you know exactly where it goes wrong?
<cp15> I can only tell that it crashes in ftccmap.c line 382 at FT_ASSERT( (FT_UInt)( char_code - node->first ) < FTC_CMAP_INDICES_MAX ); because node seems to be corrupted or NULL or at line cmap = face->charmaps[cmap_index]; because face->charmaps seems to be corrupted
 Should have been line 406 in the second part"

So, that's what we know about the problem. Please ask if you need any more details. A .src.rpm for navit which you can rebuild to reproduce the problem can be found at http://adamwill.fedorapeople.org/navit/navit-0.1.1-0.1.2347.aw_fc12.src.rpm . Run it with a stock Fedora freetype, and it fails. Run it with stock Rawhide freetype unchanged except by adding -fno-strict-aliasing to CFLAGS, and it works.

Comment 1 Adam Williamson 2009-06-18 20:56:21 UTC

Adding Martin to CC, he can provide any further details that might help.

-- 
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers

Comment 2 udo 2009-06-19 03:20:18 UTC

Problem also seen here.

Comment 3 Kevin Kofler 2009-07-29 16:54:55 UTC

Closing as a duplicate of the more recent report which has a patch attached.

The fix got pushed to F11 now.

*** This bug has been marked as a duplicate of bug 513582 ***