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[Bug 1508485] [NEW] "QThread: Destroyed while thread is still running" printed on shutdown

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Public bug reported:

Sending SIGTERM to unity8 causes this slightly concerning error message
to be printed:

QThread: Destroyed while thread is still running

Going a quick dig, I see it came from DashCommunicator:

(gdb) break src/corelib/thread/qthread.cpp:417
Breakpoint 1 at 0x7fafce6bd935: file thread/qthread.cpp, line 417.
(gdb) cont
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
81	in ../sysdeps/unix/syscall-template.S
(gdb) signal SIGTERM
Continuing with signal SIGTERM.

Breakpoint 1, QThread::~QThread (this=0x203d1f0, __in_chrg=<optimized out>) at thread/qthread.cpp:417
417	thread/qthread.cpp: No such file or directory.
(gdb) t
[Current thread is 1 (Thread 0x7fafcfcaf800 (LWP 19100))]
(gdb) info threads
  Id   Target Id         Frame 
  23   Thread 0x7fafc178b700 (LWP 19101) "unity8" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  22   Thread 0x7fafc0f8a700 (LWP 19102) "unity8" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  21   Thread 0x7fafbbfff700 (LWP 19103) "MirServerThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  20   Thread 0x7fafbb7fe700 (LWP 19104) "RPC Thread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  19   Thread 0x7fafb951d700 (LWP 19105) "MirServerThread" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  18   Thread 0x7fafb8ac0700 (LWP 19106) "Input dispatch" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  17   Thread 0x7fafaa0db700 (LWP 19107) "Mir/Snapshot" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  16   Thread 0x7fafa98da700 (LWP 19108) "Mir/IPC" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
  15   Thread 0x7fafa90d9700 (LWP 19109) "Mir/IPC" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
  14   Thread 0x7faf9db6d700 (LWP 19110) "QQmlThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  13   Thread 0x7faf8de65700 (LWP 19111) "gmain" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  12   Thread 0x7faf85664700 (LWP 19112) "gdbus" 0x00007fafcbceea91 in g_variant_type_info_check (
    info=info@entry=0x7fafcbd504b0 <g_variant_type_info_basic_table+368>, container_class=container_class@entry=0 '\000')
    at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gvarianttypeinfo.c:158
  11   Thread 0x7faf8d3ff700 (LWP 19113) "dconf worker" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  10   Thread 0x7faf7eba6700 (LWP 19114) "dashCommunicato" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  9    Thread 0x7faf73fff700 (LWP 19115) "unity8" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
  8    Thread 0x7faf735f9700 (LWP 19118) "unity8" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  7    Thread 0x7faf71dd9700 (LWP 19119) "Qt bearer threa" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  6    Thread 0x7faf63fff700 (LWP 19121) "QQuickPixmapRea" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  5    Thread 0x7faf615ad700 (LWP 19123) "Thread (pooled)" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  4    Thread 0x7faf5ffa0700 (LWP 19124) "QThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  3    Thread 0x7faf5f79f700 (LWP 19125) "QProcessManager" 0x00007fafcddbb743 in select () at ../sysdeps/unix/syscall-template.S:81
  2    Thread 0x7faf5ef5e700 (LWP 19135) "QSGRenderThread" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1    Thread 0x7fafcfcaf800 (LWP 19100) "unity8" QThread::~QThread (this=0x203d1f0, __in_chrg=<optimized out>)
    at thread/qthread.cpp:417


(gdb) bt
#0  0x00007fafce6bd935 in QThread::~QThread() (this=0x203d1f0, __in_chrg=<optimized out>) at thread/qthread.cpp:417
#1  0x00007faf845e5ef2 in  () at /usr/lib/x86_64-linux-gnu/unity8/qml/Unity/DashCommunicator/libDashCommunicator-qml.so
#2  0x00007fafce8d1d2b in QObjectPrivate::deleteChildren() (this=this@entry=0x2033f40) at kernel/qobject.cpp:1950
#3  0x00007fafce8db620 in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1030
#4  0x00007fafcf5b52bd in QQuickItem::~QQuickItem() (this=0x2033f10, __in_chrg=<optimized out>) at items/qquickitem.cpp:2223
#5  0x00007fafcf5cf7c6 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() (this=0x2033f10, __in_chrg=<optimized out>)
    at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#6  0x00007fafcf5cf7c6 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() (this=0x2033f10, __in_chrg=<optimized out>)
    at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#7  0x00007fafce8d1d2b in QObjectPrivate::deleteChildren() (this=this@entry=0x2017c10) at kernel/qobject.cpp:1950
#8  0x00007fafce8db620 in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1030
#9  0x00007fafcf5b52bd in QQuickItem::~QQuickItem() (this=0x2015e10, __in_chrg=<optimized out>) at items/qquickitem.cpp:2223
#10 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
    at items/qquickrectangle_p.h:128
#11 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
    at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#12 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
    at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
#13 0x00007fafcf66b1aa in QQuickView::~QQuickView() (this=0x1f8ff70, __in_chrg=<optimized out>) at items/qquickview.cpp:225
#14 0x000000000040fade in  ()
#15 0x000000000040a123 in  ()
#16 0x0000000000406374 in  ()
#17 0x00007fafcdcdea40 in __libc_start_main (main=
    0x4062f0, argc=1, argv=0x7ffe2523b688, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe2523b678) at libc-start.c:289
#18 0x0000000000406419 in _start ()

** Affects: unity8 (Ubuntu)
     Importance: Low
         Status: New

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https://bugs.launchpad.net/bugs/1508485

Title:
  "QThread: Destroyed while thread is still running" printed on shutdown

Status in unity8 package in Ubuntu:
  New

Bug description:
  Sending SIGTERM to unity8 causes this slightly concerning error
  message to be printed:

  QThread: Destroyed while thread is still running

  Going a quick dig, I see it came from DashCommunicator:

  (gdb) break src/corelib/thread/qthread.cpp:417
  Breakpoint 1 at 0x7fafce6bd935: file thread/qthread.cpp, line 417.
  (gdb) cont
  Continuing.
  ^C
  Program received signal SIGINT, Interrupt.
  0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
  81	in ../sysdeps/unix/syscall-template.S
  (gdb) signal SIGTERM
  Continuing with signal SIGTERM.

  Breakpoint 1, QThread::~QThread (this=0x203d1f0, __in_chrg=<optimized out>) at thread/qthread.cpp:417
  417	thread/qthread.cpp: No such file or directory.
  (gdb) t
  [Current thread is 1 (Thread 0x7fafcfcaf800 (LWP 19100))]
  (gdb) info threads
    Id   Target Id         Frame 
    23   Thread 0x7fafc178b700 (LWP 19101) "unity8" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
    22   Thread 0x7fafc0f8a700 (LWP 19102) "unity8" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
    21   Thread 0x7fafbbfff700 (LWP 19103) "MirServerThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    20   Thread 0x7fafbb7fe700 (LWP 19104) "RPC Thread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    19   Thread 0x7fafb951d700 (LWP 19105) "MirServerThread" pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    18   Thread 0x7fafb8ac0700 (LWP 19106) "Input dispatch" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    17   Thread 0x7fafaa0db700 (LWP 19107) "Mir/Snapshot" pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    16   Thread 0x7fafa98da700 (LWP 19108) "Mir/IPC" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    15   Thread 0x7fafa90d9700 (LWP 19109) "Mir/IPC" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    14   Thread 0x7faf9db6d700 (LWP 19110) "QQmlThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    13   Thread 0x7faf8de65700 (LWP 19111) "gmain" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    12   Thread 0x7faf85664700 (LWP 19112) "gdbus" 0x00007fafcbceea91 in g_variant_type_info_check (
      info=info@entry=0x7fafcbd504b0 <g_variant_type_info_basic_table+368>, container_class=container_class@entry=0 '\000')
      at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gvarianttypeinfo.c:158
    11   Thread 0x7faf8d3ff700 (LWP 19113) "dconf worker" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    10   Thread 0x7faf7eba6700 (LWP 19114) "dashCommunicato" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    9    Thread 0x7faf73fff700 (LWP 19115) "unity8" 0x00007fafcddc54f3 in epoll_wait () at ../sysdeps/unix/syscall-template.S:81
    8    Thread 0x7faf735f9700 (LWP 19118) "unity8" pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    7    Thread 0x7faf71dd9700 (LWP 19119) "Qt bearer threa" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    6    Thread 0x7faf63fff700 (LWP 19121) "QQuickPixmapRea" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    5    Thread 0x7faf615ad700 (LWP 19123) "Thread (pooled)" pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
    4    Thread 0x7faf5ffa0700 (LWP 19124) "QThread" 0x00007fafcddb98dd in poll () at ../sysdeps/unix/syscall-template.S:81
    3    Thread 0x7faf5f79f700 (LWP 19125) "QProcessManager" 0x00007fafcddbb743 in select () at ../sysdeps/unix/syscall-template.S:81
    2    Thread 0x7faf5ef5e700 (LWP 19135) "QSGRenderThread" pthread_cond_wait@@GLIBC_2.3.2 ()
      at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  * 1    Thread 0x7fafcfcaf800 (LWP 19100) "unity8" QThread::~QThread (this=0x203d1f0, __in_chrg=<optimized out>)
      at thread/qthread.cpp:417

  
  (gdb) bt
  #0  0x00007fafce6bd935 in QThread::~QThread() (this=0x203d1f0, __in_chrg=<optimized out>) at thread/qthread.cpp:417
  #1  0x00007faf845e5ef2 in  () at /usr/lib/x86_64-linux-gnu/unity8/qml/Unity/DashCommunicator/libDashCommunicator-qml.so
  #2  0x00007fafce8d1d2b in QObjectPrivate::deleteChildren() (this=this@entry=0x2033f40) at kernel/qobject.cpp:1950
  #3  0x00007fafce8db620 in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1030
  #4  0x00007fafcf5b52bd in QQuickItem::~QQuickItem() (this=0x2033f10, __in_chrg=<optimized out>) at items/qquickitem.cpp:2223
  #5  0x00007fafcf5cf7c6 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() (this=0x2033f10, __in_chrg=<optimized out>)
      at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
  #6  0x00007fafcf5cf7c6 in QQmlPrivate::QQmlElement<QQuickItem>::~QQmlElement() (this=0x2033f10, __in_chrg=<optimized out>)
      at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
  #7  0x00007fafce8d1d2b in QObjectPrivate::deleteChildren() (this=this@entry=0x2017c10) at kernel/qobject.cpp:1950
  #8  0x00007fafce8db620 in QObject::~QObject() (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1030
  #9  0x00007fafcf5b52bd in QQuickItem::~QQuickItem() (this=0x2015e10, __in_chrg=<optimized out>) at items/qquickitem.cpp:2223
  #10 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
      at items/qquickrectangle_p.h:128
  #11 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
      at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
  #12 0x00007fafcf5cf86e in QQmlPrivate::QQmlElement<QQuickRectangle>::~QQmlElement() (this=0x2015e10, __in_chrg=<optimized out>)
      at ../../include/QtQml/../../src/qml/qml/qqmlprivate.h:98
  #13 0x00007fafcf66b1aa in QQuickView::~QQuickView() (this=0x1f8ff70, __in_chrg=<optimized out>) at items/qquickview.cpp:225
  #14 0x000000000040fade in  ()
  #15 0x000000000040a123 in  ()
  #16 0x0000000000406374 in  ()
  #17 0x00007fafcdcdea40 in __libc_start_main (main=
      0x4062f0, argc=1, argv=0x7ffe2523b688, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe2523b678) at libc-start.c:289
  #18 0x0000000000406419 in _start ()

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