This bug was fixed in the package mesa - 11.1.2-1ubuntu2 --------------- mesa (11.1.2-1ubuntu2) xenial; urgency=medium
* debian/patches/glibc2.23-pthreads-compat.patch: fix misuse of pthread_barrier API. Closes LP: #1559842. -- Steve Langasek <steve.langa...@ubuntu.com> Mon, 21 Mar 2016 05:59:56 +0000 ** Changed in: mesa (Ubuntu Xenial) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1559842 Title: SIGFPE in pthread_barrier_destroy in glibc 2.23 Status in glibc package in Ubuntu: Triaged Status in mesa package in Ubuntu: Fix Released Status in glibc source package in Xenial: Triaged Status in mesa source package in Xenial: Fix Released Bug description: When running in a VM (but not on my host system), the bluez-qt autopkgtests fail with a floating point exception. The original failure, affecting both amd64 and i386, can be found here: http://autopkgtest.ubuntu.com/packages/b/bluez-qt/xenial/amd64/ To reproduce, build bluez-qt from source and then run: xvfb-run -a --server-args="-screen 0 1024x768x24+32" sh -c 'cd obj-*/autotests; gdb ./qmltests' Thread 1 "qmltests" received signal SIGFPE, Arithmetic exception. 0x00007ffff68fef49 in pthread_barrier_destroy (barrier=0x6aff30) at pthread_barrier_destroy.c:39 39 pthread_barrier_destroy.c: No such file or directory. (gdb) thread apply all bt full Thread 1 (Thread 0x7ffff7e788c0 (LWP 20087)): #0 0x00007ffff68fef49 in pthread_barrier_destroy (barrier=0x6aff30) at pthread_barrier_destroy.c:39 bar = 0x6aff30 count = 0 max_in_before_reset = <optimized out> in = <optimized out> #1 0x00007fffea1c0f8f in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so No symbol table info available. #2 0x00007fffea1cca61 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so No symbol table info available. #3 0x00007fffe9e65e6f in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so No symbol table info available. #4 0x00007fffe9e65f15 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so No symbol table info available. #5 0x00007fffe9e6434f in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so No symbol table info available. #6 0x00007ffff2c82482 in ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 No symbol table info available. #7 0x00007ffff2c5e466 in ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 No symbol table info available. #8 0x00007ffff2c5e4e9 in ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 No symbol table info available. #9 0x00007ffff2c5e63e in ?? () from /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 No symbol table info available. #10 0x00007ffff334f642 in XCloseDisplay () from /usr/lib/x86_64-linux-gnu/libX11.so.6 No symbol table info available. #11 0x00007fffed99c426 in QXcbConnection::~QXcbConnection() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 No symbol table info available. #12 0x00007fffed99c789 in QXcbConnection::~QXcbConnection() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 No symbol table info available. #13 0x00007fffed99ded6 in QXcbIntegration::~QXcbIntegration() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 No symbol table info available. #14 0x00007fffed99dfe9 in QXcbIntegration::~QXcbIntegration() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 No symbol table info available. #15 0x00007ffff557acf3 in QGuiApplicationPrivate::~QGuiApplicationPrivate() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 No symbol table info available. #16 0x00007ffff557aed9 in QGuiApplicationPrivate::~QGuiApplicationPrivate() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 No symbol table info available. #17 0x00007ffff7515db8 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 No symbol table info available. #18 0x00007ffff557ab69 in QGuiApplication::~QGuiApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 No symbol table info available. #19 0x00007ffff7fa1628 in quick_test_main(int, char**, char const*, char const*) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTest.so.5 No symbol table info available. #20 0x000000000040929f in main (argc=1, argv=0x7fffffffe4c8) at ../../autotests/qmltests.cpp:105 testsDir = @0x7fffffffe3a0: {static null = {<No data fields>}, d = 0x635970} (gdb) Since the problem is not reproducible on the host system, current guess is that it's related to cpu featureset passthrough on the guest. /proc/cpuinfo from an affected guest: # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 2 model name : QEMU Virtual CPU version 0.14 stepping : 3 microcode : 0x1 cpu MHz : 2594.108 cache size : 4096 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 4 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl pni vmx cx16 popcnt hypervisor lahf_lm tpr_shadow vnmi flexpriority ept bogomips : 5188.21 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: # It could also be related to the use of swrast_dri rather than a hardware-accelerated video driver. 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