Launchpad has imported 5 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=69034.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2013-09-06T13:19:58+00:00 Marek Kašík wrote: Created attachment 85352 Make usage of freetype thread safe Current freetype backend is not thread safe. It can cause segmentation fault when threads are not properly handled by applications which use cairo (see https://bugzilla.redhat.com/show_bug.cgi?id=678397 and its duplicates). Attached patch tries to fix this problem by creating FT_Library object for each thread. This is recommended solution by freetype (http://git.savannah.gnu.org/cgit/freetype/freetype2.git/tree/include/freetype/freetype.h#n1684). It adds a hash table to which FT_Library is added if a new thread needs one. Thread IDs are used as keys for this table. Marek Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/5 ------------------------------------------------------------------------ On 2013-09-06T17:58:01+00:00 Freedesktop wrote: Unfortunately that FreeType "recommendation" is red herring. First, people are free to pass around FT_Face among threads, and second, we will be leaking stuff this way, unless we add proper TLS support. At any rate. I suggest we use cairo for all glyph rasterizer instead. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/6 ------------------------------------------------------------------------ On 2013-12-16T06:16:19+00:00 Freedesktop wrote: Chris, any chance you have some time to think about this? Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/7 ------------------------------------------------------------------------ On 2014-07-31T16:45:44+00:00 Freedesktop wrote: *** Bug 81874 has been marked as a duplicate of this bug. *** Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/20 ------------------------------------------------------------------------ On 2014-07-31T16:59:16+00:00 Freedesktop wrote: Looks like copying thread-local storage macros from pixman-compiler.h and using them to use per-thread FT_Library might easily get most of this resolved. I can take a look if no one else steps in. Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/21 ** Changed in: libcairo Status: Unknown => Confirmed ** Changed in: libcairo Importance: Unknown => Critical ** Bug watch added: Red Hat Bugzilla #678397 https://bugzilla.redhat.com/show_bug.cgi?id=678397 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cairo in Ubuntu. https://bugs.launchpad.net/bugs/1199571 Title: Huge multi-threading violations in cairo Status in libcairo - cairo vector graphics library: Confirmed Status in “cairo” package in Ubuntu: Triaged Bug description: Fresh dist-upgrade; brought up the dash, typed "term"; single clicked on the terminal app and _bang_. ProblemType: Crash DistroRelease: Ubuntu 13.10 Package: unity 7.0.2+13.10.20130705.1-0ubuntu1 ProcVersionSignature: Ubuntu 3.10.0-2.10-generic 3.10.0 Uname: Linux 3.10.0-2-generic x86_64 ApportVersion: 2.10.2-0ubuntu4 Architecture: amd64 Date: Tue Jul 9 17:47:10 2013 EcryptfsInUse: Yes ExecutablePath: /usr/bin/compiz InstallationDate: Installed on 2013-06-06 (33 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MarkForUpload: True ProcCmdline: compiz ProcEnviron: LANGUAGE=en_US PATH=(custom, user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SegvAnalysis: Segfault happened at: 0x7ff3b4ed7a10: mov %rdx,0x10(%rax) PC (0x7ff3b4ed7a10) ok source "%rdx" ok destination "0x10(%rax)" (0x00000010) not located in a known VMA region (needed writable region)! Stack memory exhausted (SP below stack segment) SegvReason: writing NULL VMA Signal: 11 SourcePackage: unity StacktraceTop: ?? () from /usr/lib/x86_64-linux-gnu/libfreetype.so.6 ?? () from /usr/lib/x86_64-linux-gnu/libfreetype.so.6 ?? () from /usr/lib/x86_64-linux-gnu/libfreetype.so.6 ?? () from /usr/lib/x86_64-linux-gnu/libfreetype.so.6 FT_Load_Glyph () from /usr/lib/x86_64-linux-gnu/libfreetype.so.6 Title: compiz crashed with SIGSEGV in FT_Load_Glyph() UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo To manage notifications about this bug go to: https://bugs.launchpad.net/libcairo/+bug/1199571/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
