[Pkg-bitcoin-devel] Bug#841951: bitcoin-qt segfaults on startup

Tue Oct 25 08:16:45 UTC 2016

Anthony Towns wrote:

> > Starting program: /home/erikd/Local/bin/bitcoin-qt
> 
> That's an odd location for the packaged binary?

Yeah, gdb-ed the wrong binary. The correct binary does the same.

> bitcoin-qt's working fine for me with the same versions of the libraries
> as you have, so I'll downgrade this report.
> 
> Some things you might like to try if you haven't already:
> 
>  - try running
>     /usr/lib/x86_64-linux-gnu/qt5/examples/gui/analogclock/analogclock
>    from qtbase5-examples to see if simple qt programs fail?

That works fine.

>  - running "bitcoin-qt -regtest" to eliminate downloading the blockchain
>    and contacting peers while debugging

That segfaults. Very similar to before.

>  - installing bitcoind, and trying it in headless mode to avoid qt and
>    graphics related bugs

That fine also, suggesting its either qt or graphics driver related (also
as suggested by the backtrace).

>  - use "ssh -X" to get into your new desktop from somewhere else, and
>    run bitcoin-qt from there, to perhaps eliminate any problems related
>    to graphics drivers?

Crashed X displaying to another machine as well.

> > There doesn't seem to be any debug symbols available for libqt5gui5 so
> > I was not able to debug this futher.
> 
> Have you tried installing the qtbase5-dbg and related packages? That
> seems to give me useful debug info.

Ok, now I have debug symbols. BT follows.

Erik

> gdb --args /usr/bin/bitcoin-qt -regtest
GNU gdb (Debian 7.11.1-2) 7.11.1
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/bitcoin-qt...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/bitcoin-qt -regtest
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe9215700 (LWP 14921)]
[New Thread 0x7fffdc84d700 (LWP 14935)]
[New Thread 0x7fffd7fff700 (LWP 14936)]
[New Thread 0x7fffd77fe700 (LWP 14943)]
[New Thread 0x7fffd6bdd700 (LWP 14944)]
[New Thread 0x7fffd63dc700 (LWP 14945)]
[New Thread 0x7fffd57bd700 (LWP 14946)]
[New Thread 0x7fffd4fbc700 (LWP 14947)]
[New Thread 0x7fffbffff700 (LWP 14958)]
[Thread 0x7fffbffff700 (LWP 14958) exited]
[New Thread 0x7fffbf7fe700 (LWP 14959)]
[New Thread 0x7fffbeffd700 (LWP 14960)]
[New Thread 0x7fffbe7fc700 (LWP 14961)]
[Thread 0x7fffbeffd700 (LWP 14960) exited]
[New Thread 0x7fffbdffb700 (LWP 14962)]
[New Thread 0x7fffbd7fa700 (LWP 14963)]
[New Thread 0x7fffbcff9700 (LWP 14964)]
[New Thread 0x7fffa3fff700 (LWP 14965)]

Thread 1 "bitcoin-qt" received signal SIGSEGV, Segmentation fault.
qglx_findConfig (display=display at entry=0x555556151080, screen=screen at entry=0, format=..., 
    drawableBit=drawableBit at entry=1) at glxconvenience/qglxconvenience.cpp:157
157	glxconvenience/qglxconvenience.cpp: No such file or directory.
(gdb) bt
#0  qglx_findConfig (display=display at entry=0x555556151080, screen=screen at entry=0, format=..., 
    drawableBit=drawableBit at entry=1) at glxconvenience/qglxconvenience.cpp:157
#1  0x00007ffff7fe529d in qglx_findVisualInfo (display=0x555556151080, screen=0, format=0x555557016b68)
    at glxconvenience/qglxconvenience.cpp:192
#2  0x00007fffeb1693bd in QXcbWindow::create (this=0x555557016b10) at qxcbwindow.cpp:416
#3  0x00007fffeb1547b1 in QXcbIntegration::createPlatformWindow (this=<optimized out>, window=0x55555701c0d0)
    at qxcbintegration.cpp:203
#4  0x00007ffff659e2fc in QWindowPrivate::create (this=0x555556f44360, recursive=recursive at entry=false)
    at kernel/qwindow.cpp:395
#5  0x00007ffff659e6ab in QWindow::create (this=this at entry=0x55555701c0d0) at kernel/qwindow.cpp:555
#6  0x00007ffff6bb74e4 in QWidgetPrivate::create_sys (this=this at entry=0x555557014ea0, window=window at entry=0, 
    initializeWindow=initializeWindow at entry=true, destroyOldWindow=destroyOldWindow at entry=true)
    at kernel/qwidget.cpp:1467
#7  0x00007ffff6bb6b9d in QWidget::create (this=0x555556c23970, window=window at entry=0, 
    initializeWindow=initializeWindow at entry=true, destroyOldWindow=destroyOldWindow at entry=true)
    at kernel/qwidget.cpp:1331
#8  0x00007ffff6bb6fce in QWidgetPrivate::createWinId (this=<optimized out>) at kernel/qwidget.cpp:2556
#9  0x00007ffff6bb7859 in QWidget::createWinId (this=this at entry=0x555556c23970) at kernel/qwidget.cpp:2575
#10 0x00007ffff6f0ff02 in QSystemTrayIconSys::addToTray (this=0x555556c23970) at util/qsystemtrayicon_x11.cpp:139
#11 0x00007ffff6f1016c in QSystemTrayIconSys::QSystemTrayIconSys (this=0x555556c23970, qIn=<optimized out>)
    at util/qsystemtrayicon_x11.cpp:131
#12 0x00007ffff6f10322 in QSystemTrayIconPrivate::install_sys (this=this at entry=0x555556a8aed0)
    at util/qsystemtrayicon_x11.cpp:270
#13 0x00007ffff6ef1477 in QSystemTrayIcon::setVisible (this=<optimized out>, visible=<optimized out>)
    at util/qsystemtrayicon.cpp:271
#14 0x00005555555d7090 in ?? ()
#15 0x00005555555c311a in ?? ()
#16 0x00007ffff61e4729 in QObject::event (this=this at entry=0x7fffffffe010, e=e at entry=0x7fffc85f6c80)
    at kernel/qobject.cpp:1256
#17 0x00007ffff61bc8dc in QCoreApplication::event (this=this at entry=0x7fffffffe010, e=e at entry=0x7fffc85f6c80)
    at kernel/qcoreapplication.cpp:1785
#18 0x00007ffff65909a4 in QGuiApplication::event (this=this at entry=0x7fffffffe010, e=e at entry=0x7fffc85f6c80)
    at kernel/qguiapplication.cpp:1626
#19 0x00007ffff6b8154f in QApplication::event (this=0x7fffffffe010, e=0x7fffc85f6c80) at kernel/qapplication.cpp:2075
#20 0x00007ffff6b7dbec in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x7fffffffe010, 
    e=0x7fffc85f6c80) at kernel/qapplication.cpp:3804
#21 0x00007ffff6b8308f in QApplication::notify (this=0x7fffffffe010, receiver=0x7fffffffe010, e=0x7fffc85f6c80)
    at kernel/qapplication.cpp:3561
#22 0x00007ffff61b6450 in QCoreApplication::notifyInternal2 (receiver=0x7fffffffe010, event=event at entry=0x7fffc85f6c80)
    at kernel/qcoreapplication.cpp:1015
#23 0x00007ffff61b83cc in QCoreApplication::sendEvent (event=0x7fffc85f6c80, receiver=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver at entry=0x0, event_type=event_type at entry=0, 
    data=0x555556143020) at kernel/qcoreapplication.cpp:1650
#25 0x00007ffff61b8888 in QCoreApplication::sendPostedEvents (receiver=receiver at entry=0x0, event_type=event_type at entry=0)
    at kernel/qcoreapplication.cpp:1508
#26 0x00007ffff620c0f3 in postEventSourceDispatch (s=0x55555616fa70) at kernel/qeventdispatcher_glib.cpp:270
#27 0x00007ffff29857d7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffff2985a40 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff2985aec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007ffff620c4ff in QEventDispatcherGlib::processEvents (this=0x55555616f8c0, flags=...)
    at kernel/qeventdispatcher_glib.cpp:417
#31 0x00007ffff61b419a in QEventLoop::exec (this=this at entry=0x7fffffffdcb0, flags=..., flags at entry=...)
    at kernel/qeventloop.cpp:204
#32 0x00007ffff61bc99c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#33 0x00005555555b98a7 in ?? ()
---Type <return> to continue, or q <return> to quit---
#34 0x00007ffff376b2b1 in __libc_start_main (main=0x5555555b8b50, argc=2, argv=0x7fffffffe488, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe478) at ../csu/libc-start.c:291
#35 0x00005555555c1fda in ?? ()
(gdb) q

-- 
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/