.
Thread 3 (LWP 30373):
#0  __exit_thread () at ../sysdeps/unix/sysv/linux/exit-thread.h:36
        resultvar = <optimized out>
        __arg1 = 0
        _a1 = 0
#1  start_thread (arg=<optimized out>) at pthread_create.c:607
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139790525847296, 5803000427944954667, 140731776380254, 140731776380255, 0, 139790525845248, -5850334926924592341, -5850316910582478037}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#2  0x00007f238d03cfaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.
.
Thread 2 (Thread 0x7f238a25bc80 (LWP 30032)):
#0  0x00007f238daa29e0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
No symbol table info available.
#1  0x00007f238cf66a37 in __cxa_finalize (d=0x7f238db85600) at cxa_finalize.c:83
        check = 1720
        cxafn = <optimized out>
        cxaarg = <optimized out>
        f = 0x7f238d105c50 <initial+528>
        funcs = 0x7f238d105a40 <initial>
#2  0x00007f238da1e523 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
No symbol table info available.
#3  0x00007ffeab8a4080 in ?? ()
No symbol table info available.
#4  0x00007f238e7acc66 in _dl_fini () at dl-fini.c:138
        do_audit = <optimized out>
        __PRETTY_FUNCTION__ = "_dl_fini"
Backtrace stopped: frame did not save the PC
.
Thread 1 (Thread 0x7f2388740700 (LWP 30034)):
#0  0x00005654582f2a00 in ?? ()
No symbol table info available.
#1  0x000056545734991c in ?? ()
No symbol table info available.
#2  <signal handler called>
No locals.
#3  0x00005654582f2a00 in ?? ()
No symbol table info available.
#4  0x000056545734991c in ?? ()
No symbol table info available.
#5  <signal handler called>
No locals.
#6  0x00007f238d030ba9 in __GI___poll (fds=0x7f238873fcb8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551612
        sc_cancel_oldtype = 0
        sc_ret = <optimized out>
#7  0x00007f238a6b3917 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
No symbol table info available.
#8  0x00007f238a6b553a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
No symbol table info available.
#9  0x00007f2389904519 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
No symbol table info available.
#10 0x00007f238d517c77 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#11 0x00007f238cf07182 in start_thread (arg=<optimized out>) at pthread_create.c:486
        ret = <optimized out>
        pd = <optimized out>
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139790589888256, 5803000427944954667, 140731776386190, 140731776386191, 140731776386400, 139790589886208, -5850326809973273813, -5850316910582478037}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#12 0x00007f238d03cfaf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
No locals.