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List:       kde-bugs-dist
Subject:    [Bug 242535] akregator crashes on startup if file descriptor limit
From:       Thomas Klausner <tk () giga ! or ! at>
Date:       2011-02-28 22:46:44
Message-ID: 20110228224644.909E9808E6 () immanuel ! kde ! org
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https://bugs.kde.org/show_bug.cgi?id=242535


Thomas Klausner <tk@giga.or.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |UNCONFIRMED
         Resolution|BACKTRACE                   |




--- Comment #2 from Thomas Klausner <tk giga or at>  2011-02-28 23:46:41 ---
I tried to get a useful backtrace (now using 4.4.9).
I've compiled it with symbols, but when I start it from gdb in the command
line, it exits much earlier:

(gdb) r
Starting program:
/usr/obj/misc/kdepim4/work.x86_64/kdepim-4.4.9/_KDE_build/akregator/src/akregator

Breakpoint 1, main (argc=1, argv=0x7f7fffffd478)
    at /usr/obj/misc/kdepim4/work.x86_64/kdepim-4.4.9/akregator/src/main.cpp:74
74      int main(int argc, char **argv)
(gdb) n
76          Akregator::AboutData about;
(gdb)
2195        inline QFlags(QFlag f) : i(f) {}
(gdb)
77          KCmdLineArgs::init(argc, argv, &about);
(gdb)
382     inline QByteArray::QByteArray(): d(&shared_null) { d->ref.ref(); }
(gdb)
121                      : "memory");
(gdb)
382     inline QByteArray::QByteArray(): d(&shared_null) { d->ref.ref(); }
(gdb)
121                      : "memory");
(gdb)
78          KCmdLineArgs::addCmdLineOptions( Akregator::akregator_options() );
(gdb)
383     inline QByteArray::~QByteArray() { if (!d->ref.deref()) qFree(d); }
(gdb)
133                      : "memory");
(gdb)
383     inline QByteArray::~QByteArray() { if (!d->ref.deref()) qFree(d); }
(gdb)
133                      : "memory");
(gdb)
383     inline QByteArray::~QByteArray() { if (!d->ref.deref()) qFree(d); }
(gdb)
79          KUniqueApplication::addCmdLineOptions();
(gdb)
81          if ( !Akregator::Application::start() ) {
(gdb)





Program exited with code 0377.   
(gdb)
The program is not being run.


Starting it outside of gdb, I see:
wiz@yt:/usr/pkgsrc/misc/kdepim4> 
work.x86_64/kdepim-4.4.9/_KDE_build/akregator/src/akregator
akregator(7039)/kdeui (KIconLoader) KSharedDataCache::Private::mapSharedMemory:
Failed to establish shared memory mapping, will fallback to private memory --
memory usage will increase
QMetaObject::invokeMethod: No such method
KUniqueApplication::loadCommandLineOptionsForNewInstance()
wiz@yt:/usr/pkgsrc/misc/kdepim4> Object::connect: No such signal
QDBusAbstractInterface::iconChanged( bool, QString, QString )
Object::connect: No such signal Akregator::SubscriptionListView::signalDropped
(KUrl::List &, Akregator::TreeNode*, Akregator::Folder*)
Object::connect:  (sender name:   'feedtree')
Object::connect:  (receiver name: 'akregator_view')
akregator(7039)/kdeui (KIconLoader) KSharedDataCache::Private::mapSharedMemory:
Failed to establish shared memory mapping, will fallback to private memory --
memory usage will increase
akregator(7039) KIO::SlavePrivate::SlavePrivate: Connection server not
listening, could not connect
QEventDispatcherUNIXPrivate(): Unable to create thread pipe: Too many open
files
QEventDispatcherUNIXPrivate(): Can not continue without a thread pipe
akregator(7039): couldn't create slave: "Cannot talk to klauncher: Did not
receive a reply. Possible causes include: the remote application did not send a
reply, the message bus security policy blocked the reply, the reply timeout
expired, or the network connection was broken."
KCrash: Application 'akregator' crashing...
KCrash: Attempting to start /usr/pkg/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/wiz/.kde/socket-yt.nih.at/kdeinit4__0

Inside the drkonqi window there is no useful information (backtrace doesn't
seem to work/work well on NetBSD).

When I load the core dump in gdb, I see:
Program terminated with signal 5, Trace/breakpoint trap.
#0  0x00007f7ff7c02614 in _rtld_linkmap_add () from /usr/libexec/ld.elf_so
(gdb) bt
#0  0x00007f7ff7c02614 in _rtld_linkmap_add () from /usr/libexec/ld.elf_so
#1  0x00007f7ff7c03de8 in dlopen () from /usr/libexec/ld.elf_so
#2  0x00007f7fefb8e154 in QLibraryPrivate::load_sys ()
   from /usr/pkg/qt4/lib/libQtCore.so.4
#3  0x00007f7fefb894d0 in QLibraryPrivate::load ()
   from /usr/pkg/qt4/lib/libQtCore.so.4
#4  0x00007f7fefb89506 in QLibrary::load ()
   from /usr/pkg/qt4/lib/libQtCore.so.4
#5  0x00007f7ff0d7dc2d in qt_init () from /usr/pkg/qt4/lib/libQtGui.so.4
#6  0x00007f7ff0d04daa in QApplicationPrivate::construct ()
   from /usr/pkg/qt4/lib/libQtGui.so.4
#7  0x00007f7ff0d05840 in QApplication::QApplication ()
   from /usr/pkg/qt4/lib/libQtGui.so.4
#8  0x00007f7ff1a666d5 in KApplication (this=0x7f7fffffd340,
    GUIenabled=<value optimized out>, cData=@0x7f7fffffd260)
    at
/scratch/x11/kdelibs4/work/kdelibs-4.5.5/kdeui/kernel/kapplication.cpp:380
#9  0x00007f7ff1a6d3f8 in KUniqueApplication (this=0x7f7fffffd340,
    GUIenabled=true, configUnique=<value optimized out>)
    at
/scratch/x11/kdelibs4/work/kdelibs-4.5.5/kdeui/kernel/kuniqueapplication.cpp:317
#10 0x00007f7ff681495b in PimUniqueApplication (this=0x7f7ff77a57b8)
    at
/scratch/misc/kdepimlibs4/work/kdepimlibs-4.5.5/kontactinterface/pimuniqueapplication.cpp:42
#11 0x000000000040971d in main (argc=<value optimized out>,
    argv=<value optimized out>)
    at /usr/obj/misc/kdepim4/work.x86_64/kdepim-4.4.9/akregator/src/main.cpp:40
(gdb)  thread 2
Thread ID 2 not known.

What now?

Have you tried limiting the number of file descriptors to 128 (default here)
before starting akregator with many feeds? Or perhaps less, so you might
reproduce the problem faster.

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