** Patch added: "debdiff for trusty" https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1748597/+attachment/5052974/+files/libunwind-trusty.debdiff
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libunwind in Ubuntu. https://bugs.launchpad.net/bugs/1748597 Title: Please backport fix for bugs.debian.org/827015 Status in libunwind package in Ubuntu: New Status in libunwind package in Debian: Fix Released Bug description: [Impact] When a C++ exception is thrown with libunwind linked in, the signal mask is corrupted. For MongoDB, if the CPU profiler is enabled (which requires linking libunwind), any exception that is raised within the server may cause random signals to become unblocked on a thread. If SIGTERM becomes unblocked on any thread but the main thread, the server won't exit cleanly (this is particularly evident when running the MongoDB test suite, which starts/stops servers repeatedly). This also seems to impact Pyston: https://lab.nexedi.com/Daetalus/Pyston/commit/1bac7510861a112a9023f821bf3e857a6fb45037 [Test Case] I've attached the test case from the upstream Debian bug (https://bugs.debian.org/827015). $ g++ sigtest.cpp -lpthread $ ./a.out Signals blocked: 1 (Hangup) 65 (Unknown signal 65) Throw exception Signals blocked: 1 (Hangup) 65 (Unknown signal 65) $ g++ sigtest.cpp -lpthread -lunwind $ ./a.out Signals blocked: 1 (Hangup) 65 (Unknown signal 65) Throw exception Signals blocked: 7 (Bus error) 8 (Floating point exception) 10 (User defined signal 1) 12 (User defined signal 2) 13 (Broken pipe) 15 (Terminated) 17 (Child exited) 20 (Stopped)21 (Stopped (tty input)) 25 (File size limit exceeded) 26 (Virtual timer expired) 27 (Profiling timer expired) 28 (Window changed) 29 (I/O possible) 30 (Power failure) 31 (Bad system call) 32 (Unknown signal 32) 33 (Unknown signal 33) 34 (Real-time signal 0) 35 (Real-time signal 1) 36 (Real-time signal 2) 37 (Real-time signal 3) 38 (Real-time signal 4) 39 (Real-time signal 5) 40 (Real-time signal 6) 41 (Real-time signal 7) 42 (Real-time signal 8) 43 (Real-time signal 9) 44 (Real-time signal 10) 45 (Real-time signal 11) 46 (Real-time signal 12) 47 (Real-time signal 13) 65 (Unknown signal 65) [Regression Potential] This fix is already present in bionic and Debian testing, and has been for a couple months. The upstream fix has existed for over a year. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1748597/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
