.
Thread 3 (LWP 6218):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x00007f16bc27dc25 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=0, op=0, uaddr=<optimized out>) at /usr/include/urcu/futex.h:65
No locals.
#2  futex_async (op=0, val=0, timeout=0x0, uaddr2=0x0, val3=0, uaddr=<optimized out>) at /usr/include/urcu/futex.h:97
No locals.
#3  wait_for_sessiond (sock_info=0x7f16bc4d34e0 <global_apps>) at lttng-ust-comm.c:1297
No locals.
#4  ust_listener_thread (arg=0x7f16bc4d34e0 <global_apps>) at lttng-ust-comm.c:1359
        sock_info = 0x7f16bc4d34e0 <global_apps>
        sock = <optimized out>
        ret = <optimized out>
        prev_connect_failed = <optimized out>
        has_waited = <optimized out>
        timeout = <optimized out>
        __func__ = "ust_listener_thread"
        __PRETTY_FUNCTION__ = "ust_listener_thread"
#5  0x00007f16bff706ca in start_thread (arg=0x7f16aded5700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f16aded5700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139735384020736, -6131021272848122383, 0, 140725294246479, 139735384021440, 139735384020736, 6108965186008661489, 6108925416546516465}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007f16c028f0ff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 2 (LWP 6219):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
No locals.
#1  0x00007f16bc27dc25 in futex (val3=0, uaddr2=0x0, timeout=0x0, val=0, op=0, uaddr=<optimized out>) at /usr/include/urcu/futex.h:65
No locals.
#2  futex_async (op=0, val=0, timeout=0x0, uaddr2=0x0, val3=0, uaddr=<optimized out>) at /usr/include/urcu/futex.h:97
No locals.
#3  wait_for_sessiond (sock_info=0x7f16bc4d14a0 <local_apps>) at lttng-ust-comm.c:1297
No locals.
#4  ust_listener_thread (arg=0x7f16bc4d14a0 <local_apps>) at lttng-ust-comm.c:1359
        sock_info = 0x7f16bc4d14a0 <local_apps>
        sock = <optimized out>
        ret = <optimized out>
        prev_connect_failed = <optimized out>
        has_waited = <optimized out>
        timeout = <optimized out>
        __func__ = "ust_listener_thread"
        __PRETTY_FUNCTION__ = "ust_listener_thread"
#5  0x00007f16bff706ca in start_thread (arg=0x7f16ad6d4700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f16ad6d4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139735375628032, -6131021272848122383, 0, 140725294246479, 139735375628736, 139735375628032, 6108964088107646449, 6108925416546516465}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#6  0x00007f16c028f0ff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105
No locals.
.
Thread 1 (LWP 6209):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
        set = {__val = {0, 139735732953944, 140725294244928, 4294967552, 139735732953088, 140725294244912, 139735698871585, 252833149, 4294967295, 1, 139735688863192, 139735732956896, 5, 0, 140725294245248, 139735688852896}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x00007f16c01be3ea in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 93977713012528, 139735699313815, 93977713077664, 139735689074057, 93977713077936, 12263001364010518528, 140725294245424, 140725294245792, 139735702002176, 2880, 4294967295, 139735732179728, 140725294245424, 93977713077920, 1}}, sa_flags = -466334112, sa_restorer = 0x5578e4344e60}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f16c0b81451 in qt_message_fatal (context=..., message=<synthetic pointer>) at global/qlogging.cpp:1682
No locals.
#3  QMessageLogger::fatal (this=this@entry=0x7ffd292ca7a0, msg=msg@entry=0x7f16ac63fd40 "QXcbConnection: Could not connect to display %s") at global/qlogging.cpp:793
        message = <optimized out>
        ap = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7ffd292ca720, reg_save_area = 0x7ffd292ca660}}
#4  0x00007f16ac5b205e in QXcbConnection::QXcbConnection (this=0x5578e4344e60, nativeInterface=0x5578e4336f30, canGrabServer=<optimized out>, defaultVisualId=<optimized out>, displayName=<optimized out>) at qxcbconnection.cpp:595
        dpy = <optimized out>
        extensions = {0x70, 0x7f16c0548b00 <main_arena>, 0x18, 0x5578e433c8f8, 0x7ffd292cafd8, 0x7f16c0548b00 <main_arena>, 0x370, 0x0}
        glIntegrationNames = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x51006c6100000038}, d = 0x51006c6100000038}}, <No data fields>}
        glIntegrationName = {static null = {<No data fields>}, d = 0x7ffd292ca7c0}
#5  0x00007f16ac5b526e in QXcbIntegration::QXcbIntegration (this=<optimized out>, parameters=..., argc=@0x7ffd292cad8c: 1, argv=0x7ffd292cafd8) at qxcbintegration.cpp:186
        displayName = <optimized out>
        noGrabArg = <optimized out>
        doGrabArg = <optimized out>
        canNotGrabEnv = false
#6  0x00007f16ac87630d in QXcbIntegrationPlugin::create (this=<optimized out>, system=..., parameters=..., argc=@0x7ffd292cad8c: 1, argv=0x7ffd292cafd8) at qxcbmain.cpp:56
No locals.
#7  0x00007f16c129941d in qLoadPlugin<QPlatformIntegration, QPlatformIntegrationPlugin, QStringList const&, int&, char**&> (key=..., loader=<optimized out>) at ../../include/QtCore/5.7.1/QtCore/private/../../../../../src/corelib/plugin/qfactoryloader_p.h:103
        factoryObject = <optimized out>
        index = <optimized out>
#8  QPlatformIntegrationFactory::create (platform=..., paramList=..., argc=@0x7ffd292cad8c: 1, argv=argv@entry=0x7ffd292cafd8, platformPluginPath=...) at kernel/qplatformintegrationfactory.cpp:71
No locals.
#9  0x00007f16c12a777a in init_platform (argv=<optimized out>, argc=@0x7ffd292cad8c: 1, platformThemeName=..., platformPluginPath=..., pluginArgument=...) at kernel/qguiapplication.cpp:1094
        arguments = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x5578e4339840}, d = 0x5578e4339840}}, <No data fields>}
        name = {static null = {<No data fields>}, d = 0x5578e43375a0}
        argumentsKey = {static null = {<No data fields>}, d = 0x5578e4337500}
        themeNames = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x62696c2f756e672d}, d = 0x62696c2f756e672d}}, <No data fields>}
#10 QGuiApplicationPrivate::createPlatformIntegration (this=0x5578e4337710) at kernel/qguiapplication.cpp:1257
        platformPluginPath = {static null = {<No data fields>}, d = 0x7f16c0e15a00 <QArrayData::shared_null>}
        platformName = {d = 0x5578e43376b0}
        platformNameEnv = {d = 0x7f16c0e15a00 <QArrayData::shared_null>}
        platformThemeName = {static null = {<No data fields>}, d = 0x7f16c0e15a00 <QArrayData::shared_null>}
        icon = {static null = {<No data fields>}, d = 0x7f16c0e15a00 <QArrayData::shared_null>}
        j = <optimized out>
#11 0x00007f16c12a820d in QGuiApplicationPrivate::createEventDispatcher (this=<optimized out>) at kernel/qguiapplication.cpp:1274
No locals.
#12 0x00007f16c0d70def in QCoreApplicationPrivate::init (this=this@entry=0x5578e4337710) at kernel/qcoreapplication.cpp:787
No locals.
#13 0x00007f16c12a9c3f in QGuiApplicationPrivate::init (this=this@entry=0x5578e4337710) at kernel/qguiapplication.cpp:1297
        loadTestability = <optimized out>
        pluginList = {<QListSpecialMethods<QByteArray>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x65006d007b0025}, d = 0x65006d007b0025}}
        session_id = {static null = {<No data fields>}, d = 0x65007400610063}
        session_key = {static null = {<No data fields>}, d = 0xff0000000000}
        s = {static null = {<No data fields>}, d = 0x0}
        j = <optimized out>
        envPlugins = {d = 0x2d64616f6c6e776f}
#14 0x00007f16c2011049 in QApplicationPrivate::init (this=0x5578e4337710) at kernel/qapplication.cpp:583
No locals.
#15 0x00005578e34fa752 in Pasted::Pasted (this=0x7ffd292cae80, argc=<optimized out>, argv=<optimized out>) at ./pasted/pasted.cpp:124
No locals.
#16 0x00005578e34f9470 in main (argc=1, argv=0x7ffd292cafd8) at ./pasted/pasted.cpp:255
        pasted = {<QApplication> = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x7f16c26e5148 <vtable for QApplication+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0ec2c80 <qt_meta_stringdata_QObject>, data = 0x7f16c0ec2b60 <qt_meta_data_QObject>, static_metacall = 0x7f16c0d9e340 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x5578e4337710}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0f0cea0 <qt_meta_stringdata_Qt>, data = 0x7f16c0f0a3e0 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f16c11a98e0 <QObject::staticMetaObject>, stringdata = 0x7f16c0f24420 <qt_meta_stringdata_QCoreApplication>, data = 0x7f16c0f24300 <qt_meta_data_QCoreApplication>, static_metacall = 0x7f16c0e0fee0 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7ffd292cae80}, static staticMetaObject = {d = {superdata = 0x7f16c11b2520 <QCoreApplication::staticMetaObject>, stringdata = 0x7f16c1616f00 <qt_meta_stringdata_QGuiApplication>, data = 0x7f16c1616cc0 <qt_meta_data_QGuiApplication>, static_metacall = 0x7f16c12b0430 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f16c18d9440 <QGuiApplication::staticMetaObject>, stringdata = 0x7f16c238d900 <qt_meta_stringdata_QApplication>, data = 0x7f16c238d780 <qt_meta_data_QApplication>, static_metacall = 0x7f16c20111c0 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f16c26e51c0 <QApplication::staticMetaObject>, stringdata = 0x5578e34fbce0 <qt_meta_stringdata_Pasted>, data = 0x5578e34fbc60 <qt_meta_data_Pasted>, static_metacall = 0x5578e34fb810 <Pasted::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, clipboard_ = 0x28, content_hub_ = 0x7f16c11b5a40 <guard variable for (anonymous namespace)::Q_QGS_resourceList::innerFunction()::holder>, mimeDataX_ = 0x2, lastMimeData_ = {_M_t = {<std::_Tuple_impl<0ul, QMimeData*, std::default_delete<QMimeData> >> = {<std::_Tuple_impl<1ul, std::default_delete<QMimeData> >> = {<std::_Head_base<1ul, std::default_delete<QMimeData>, true>> = {<std::default_delete<QMimeData>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0ul, QMimeData*, false>> = {_M_head_impl = 0x7f16c11b5a61 <(anonymous namespace)::Q_QGS_resourceMutex::innerFunction()::holder+1>}, <No data fields>}, <No data fields>}}, persistentSurfaceId_ = {static null = {<No data fields>}, d = 0x1}}
        t = {<QObject> = {_vptr.QObject = 0x7ffd292cae90, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0ec2c80 <qt_meta_stringdata_QObject>, data = 0x7f16c0ec2b60 <qt_meta_data_QObject>, static_metacall = 0x7f16c0d9e340 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7ffd292cae8f}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0f0cea0 <qt_meta_stringdata_Qt>, data = 0x7f16c0f0a3e0 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f16c11a98e0 <QObject::staticMetaObject>, stringdata = 0x7f16c0f17e00 <qt_meta_stringdata_QThread>, data = 0x7f16c0f17d20 <qt_meta_data_QThread>, static_metacall = 0x7f16c0e0b450 <QThread::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        worker = warning: can't find linker symbol for virtual table for `XEventWorker' value
warning:   found `QtMetaTypePrivate::QMetaTypeFunctionHelper<void, false>::Load(QDataStream&, void*)' instead
{<QObject> = {_vptr.QObject = 0x7f16c0d83260 <QtMetaTypePrivate::QMetaTypeFunctionHelper<void, false>::Construct(void*, void const*)>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0ec2c80 <qt_meta_stringdata_QObject>, data = 0x7f16c0ec2b60 <qt_meta_data_QObject>, static_metacall = 0x7f16c0d9e340 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f16c0d83270 <QtMetaTypePrivate::QMetaTypeFunctionHelper<void, false>::Destruct(void*)>}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f16c0f0cea0 <qt_meta_stringdata_Qt>, data = 0x7f16c0f0a3e0 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f16c11a98e0 <QObject::staticMetaObject>, stringdata = 0x5578e34fbe00 <qt_meta_stringdata_XEventWorker>, data = 0x5578e34fbd80 <qt_meta_data_XEventWorker>, static_metacall = 0x5578e34fb790 <XEventWorker::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}