Launchpad has imported 1 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=81874.
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 2014-07-29T12:20:17+00:00 Alberto Salvia Novella wrote: I looked at the implementation of cairo-ft-font.c and it seems that there are huge multi-threading violations in cairo. The reason is that FreeType API documentation clearly states: In multi-threaded applications, make sure that the same FT_Library object or any of its children doesn't get accessed in parallel. Cairo initializes FT_Library for its font map and there's a lock for that, however it's only used for font map manipulations, the actual FT_ library calls are completely unprotected with that lock, although they should be! What adds to the injury is that cairo-ft-font.c even has this comment on one of its functions: You must be careful when using this function in a library or in a threaded application, because freetype's design makes it unsafe to call freetype functions simultaneously from multiple threads, (even if using distinct FT_Face objects) Reply at: https://bugs.launchpad.net/ubuntu/+source/cairo/+bug/1199571/comments/15 ** Changed in: libcairo Status: Unknown => Confirmed ** Changed in: libcairo Importance: Unknown => Critical -- You received this bug notification because you are a member of Desktop 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/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
