I looked at my coredump on trusty (it crashed for me twice already!) with gdb and I see evidence that this crash might be due to multithreading issues. The reason is that when inspecting memory at %rdx (edge) and I see that a pointer at %rdx+0x48 (edge->first) doesn't match with a pointer in %rcx (edge->first taken at the start of the loop). Besides, freetype code can never produce %rax == 0 at the crash location, this would only happen if af_latin_hints_compute_edges is called concurrently on the same hints structure, which causes pointers to change for segments that are processed in another thread. Best of luck, ThreadStackTrace.txt shows exactly that, two threads are in af_latin_hints_compute_edges with same parameters!
Now the real question is which application or library is actually violating thread-safety here... -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1199571 Title: compiz crashed with SIGSEGV in af_latin_hints_compute_edges() Status in “unity” 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/ubuntu/+source/unity/+bug/1199571/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp
