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List:       kde-core-devel
Subject:    Deadlock on QClipboard
From:       Waldo Bastian <bastian () kde ! org>
Date:       2000-12-21 19:13:31
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Several people have reported hangups of their desktop and I just experienced 
a hangup with kmail. The following backtrace points at QClipboard.

I'm using Qt 2.2.2.

Cheers,
Waldo

#0  0x410f171e in __select () from /lib/libc.so.6
(gdb) up
#1  0x40e82df0 in __DTOR_END__ () at fam.c++:357
357     }
(gdb) up
#2  0x40adb6fa in QClipboardWatcher::getDataInFormat (this=0x84e06f8,
    fmtatom=436) at kernel/qclipboard_x11.cpp:781
781         if ( 
!qt_xclb_wait_for_event(dpy,win,SelectionNotify,&xevent,1000) )(gdb) up
#3  0x40adb166 in QClipboardWatcher::format (this=0x84e06f8, n=1)
    at kernel/qclipboard_x11.cpp:708
708         QByteArray targets = getDataInFormat(xa_targets);
(gdb) up
#4  0x40b435a1 in QMimeSource::provides (this=0x84e06f8,
    mimeType=0x40e3083c "image/ppm") at kernel/qmime.cpp:104
104         for (int i=0; (fmt = format(i)); i++) {
(gdb) up
#5  0x40ada6c5 in QClipboard::event (this=0x87517e8, e=0xbffff39c)
    at kernel/qclipboard_x11.cpp:555
555                         if (d->source()->provides("image/ppm")) atoms++;
(gdb) up
#6  0x40b0b0d8 in QApplication::notify (this=0xbffff688, receiver=0x87517e8,
    event=0xbffff39c) at kernel/qapplication.cpp:1669
1669        return receiver->event( event );
(gdb) up
#7  0x4085dd56 in KApplication::notify (this=0xbffff688, receiver=0x87517e8,
    event=0xbffff39c) at kapp.cpp:511
511         return QApplication::notify(receiver, event);
(gdb) up
#8  0x40d795f1 in QApplication::sendEvent (receiver=0x87517e8,
    event=0xbffff39c) at kernel/qapplication.h:395
395     { return qApp->notify( receiver, event ); }
(gdb) up
#9  0x40ad330b in QApplication::x11ProcessEvent (this=0xbffff688,
    event=0xbffff50c) at kernel/qapplication_x11.cpp:2997
2997                QApplication::sendEvent( qt_clipboard, &e );
(gdb) up
#10 0x40ad1aab in QApplication::processNextEvent (this=0xbffff688,
    canWait=true) at kernel/qapplication_x11.cpp:2446
2446                    if ( x11ProcessEvent( &event ) == 1 ) {
(gdb) up
#11 0x40b0d12f in QApplication::enter_loop (this=0xbffff688)
    at kernel/qapplication.cpp:2556
2556            processNextEvent( TRUE );
(gdb) up
#12 0x40ad19db in QApplication::exec (this=0xbffff688)
    at kernel/qapplication_x11.cpp:2402
2402        enter_loop();

Cheers,
Waldo

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