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[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

** Changed in: glibc (Ubuntu Xenial)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1559842

Title:
  SIGFPE in pthread_barrier_destroy in glibc 2.23

Status in glibc package in Ubuntu:
  Invalid
Status in mesa package in Ubuntu:
  Fix Released
Status in glibc source package in Xenial:
  Invalid
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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