Application: ktorrent (4.3.1)
KDE Platform Version: 4.14.2
Qt Version: 4.8.6
Operating System: Linux 3.16.0-4-amd64 x86_64
Distribution: LMDE 2 Betsy

-- Information about the crash:
- start ktorrent (not first time)
- go to plugin panel
- chceck "scan folder" checkbox

The crash can be reproduced sometimes.

-- Backtrace:
Application: KTorrent (ktorrent), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe726a257c0 (LWP 19388))]

Thread 7 (Thread 0x7fe70fa84700 (LWP 19394)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fe722665072 in _q_futex (val2=<optimized out>, addr2=<optimized out>, timeout=<optimized out>, val=<optimized out>, op=<optimized out>, addr=<optimized out>) at thread/qmutex_unix.cpp:99
#2  QMutexPrivate::wait (this=0x20d9030, timeout=-1000000) at thread/qmutex_unix.cpp:113
#3  0x00007fe722661305 in QMutex::lockInternal (this=<optimized out>) at thread/qmutex.cpp:450
#4  0x00007fe72650cd6e in bt::Out(unsigned int) () from /usr/lib/libktorrent.so.5
#5  0x00007fe72650d1a2 in ?? () from /usr/lib/libktorrent.so.5
#6  0x00007fe72265b9a1 in qt_message_output (msgType=msgType@entry=QtWarningMsg, buf=0x7fe700035ae8 "QSocketNotifier: Invalid socket 20 and type 'Read', disabling...") at global/qglobal.cpp:2311
#7  0x00007fe72265be09 in qt_message(QtMsgType, const char *, typedef __va_list_tag __va_list_tag *) (msgType=msgType@entry=QtWarningMsg, msg=msg@entry=0x7fe722854890 "QSocketNotifier: Invalid socket %d and type '%s', disabling...", ap=ap@entry=0x7fe70fa83b40) at global/qglobal.cpp:2432
#8  0x00007fe72265c081 in qWarning (msg=msg@entry=0x7fe722854890 "QSocketNotifier: Invalid socket %d and type '%s', disabling...") at global/qglobal.cpp:2514
#9  0x00007fe72279f598 in socketNotifierSourceCheck (source=0x7fe700002e00) at kernel/qeventdispatcher_glib.cpp:90
#10 0x00007fe71d4658c1 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007fe71d465e83 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007fe71d465ffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fe72279fd37 in QEventDispatcherGlib::processEvents (this=0x7fe7000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#14 0x00007fe72276f271 in QEventLoop::processEvents (this=this@entry=0x7fe70fa83e10, flags=...) at kernel/qeventloop.cpp:149
#15 0x00007fe72276f5d5 in QEventLoop::exec (this=this@entry=0x7fe70fa83e10, flags=...) at kernel/qeventloop.cpp:204
#16 0x00007fe722663e99 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:538
#17 0x00007fe72266670f in QThreadPrivate::start (arg=0x22850f0) at thread/qthread_unix.cpp:349
#18 0x00007fe71f3750a4 in start_thread (arg=0x7fe70fa84700) at pthread_create.c:309
#19 0x00007fe721b0504d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7fe6ebfff700 (LWP 19486)):
#0  0x00007fe72651d390 in ?? () from /usr/lib/libktorrent.so.5
#1  0x00007fe72651d4f6 in ?? () from /usr/lib/libktorrent.so.5
#2  0x00007fe72651d709 in ?? () from /usr/lib/libktorrent.so.5
#3  0x00007fe72266670f in QThreadPrivate::start (arg=0x20d4b90) at thread/qthread_unix.cpp:349
#4  0x00007fe71f3750a4 in start_thread (arg=0x7fe6ebfff700) at pthread_create.c:309
#5  0x00007fe721b0504d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7fe6eb7fe700 (LWP 19487)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007fe7226651ea in thread_sleep (ti=ti@entry=0x7fe6eb7fdda0) at thread/qthread_unix.cpp:492
#2  0x00007fe722665aad in QThread::msleep (msecs=<optimized out>) at thread/qthread_unix.cpp:518
#3  0x00007fe72651cf63 in ?? () from /usr/lib/libktorrent.so.5
#4  0x00007fe72651d709 in ?? () from /usr/lib/libktorrent.so.5
#5  0x00007fe72266670f in QThreadPrivate::start (arg=0x20d4f80) at thread/qthread_unix.cpp:349
#6  0x00007fe71f3750a4 in start_thread (arg=0x7fe6eb7fe700) at pthread_create.c:309
#7  0x00007fe721b0504d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7fe6eaffd700 (LWP 19488)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe722666c66 in wait (time=18446744073709551615, this=0x227d460) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x3493a80, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fe72651ffea in ?? () from /usr/lib/libktorrent.so.5
#4  0x00007fe72266670f in QThreadPrivate::start (arg=0x3493a70) at thread/qthread_unix.cpp:349
#5  0x00007fe71f3750a4 in start_thread (arg=0x7fe6eaffd700) at pthread_create.c:309
#6  0x00007fe721b0504d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fe6fd203700 (LWP 4527)):
#0  0x00007fe721ad2bb5 in __getdents (fd=5, buf=0x7fe6f9ed6ac0 "]\003r", nbytes=32768) at ../sysdeps/unix/sysv/linux/getdents.c:111
#1  0x00007fe721ad291c in __readdir_r (dirp=0x7fe6f9ed6a90, entry=0x7fe6f83630b0, result=0x7fe6f833a500) at ../sysdeps/posix/readdir_r.c:63
#2  0x00007fe72274e064 in QFileSystemIterator::advance (this=this@entry=0x7fe6f833a4f0, fileEntry=..., metaData=...) at io/qfilesystemiterator_unix.cpp:114
#3  0x00007fe7226ef2be in QDirIteratorPrivate::advance (this=this@entry=0x7fe6f83694a0) at io/qdiriterator.cpp:258
#4  0x00007fe7226efae0 in QDirIteratorPrivate::QDirIteratorPrivate (this=this@entry=0x7fe6f83694a0, entry=..., nameFilters=..., filters=filters@entry=..., flags=flags@entry=..., resolveEngine=resolveEngine@entry=true) at io/qdiriterator.cpp:181
#5  0x00007fe7226efe79 in QDirIterator::QDirIterator (this=0x7fe6fd202680, path=..., nameFilters=..., filters=..., flags=...) at io/qdiriterator.cpp:473
#6  0x00007fe7226e98cc in QDir::entryList (this=<optimized out>, nameFilters=..., filters=..., sort=...) at io/qdir.cpp:1322
#7  0x00007fe6fe7f877d in ?? () from /usr/lib/kde4/ktscanfolderplugin.so
#8  0x00007fe6fe7f94ae in ?? () from /usr/lib/kde4/ktscanfolderplugin.so
#9  0x00007fe722789ce3 in QObject::event (this=0x3ad7ba0, e=<optimized out>) at kernel/qobject.cpp:1253
#10 0x00007fe722ca048c in QApplicationPrivate::notify_helper (this=this@entry=0x210fa40, receiver=receiver@entry=0x3ad7ba0, e=e@entry=0x7fe6f83cb1e0) at kernel/qapplication.cpp:4570
#11 0x00007fe722ca6fa8 in QApplication::notify (this=0x7fff222dfca0, receiver=0x3ad7ba0, e=0x7fe6f83cb1e0) at kernel/qapplication.cpp:4356
#12 0x000000000043a632 in _start ()

Thread 2 (Thread 0x7fe6ea7fc700 (LWP 5122)):
[KCrash Handler]
#6  0x00007fe721a54107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x00007fe721a554e8 in __GI_abort () at abort.c:89
#8  0x00007fe721a92204 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fe721b84fe0 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
#9  0x00007fe721a979de in malloc_printerr (action=1, str=0x7fe721b85178 "free(): invalid next size (normal)", ptr=<optimized out>) at malloc.c:4996
#10 0x00007fe721a986e6 in _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
#11 0x00007fe7226b1018 in QString::free (d=0x7fe6f40058e0) at tools/qstring.cpp:1235
#12 0x00007fe7226b15ea in QString::operator= (this=0x20d9008, other=...) at tools/qstring.cpp:1412
#13 0x00007fe72650bd37 in bt::endl(bt::Log&) () from /usr/lib/libktorrent.so.5
#14 0x00007fe72659f2b6 in ?? () from /usr/lib/libktorrent.so.5
#15 0x00007fe726599c7b in bt::PreallocationThread::run() () from /usr/lib/libktorrent.so.5
#16 0x00007fe72266670f in QThreadPrivate::start (arg=0x29ad6c0) at thread/qthread_unix.cpp:349
#17 0x00007fe71f3750a4 in start_thread (arg=0x7fe6ea7fc700) at pthread_create.c:309
#18 0x00007fe721b0504d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fe726a257c0 (LWP 19388)):
[KCrash Handler]
#6  0x00007fe721a54107 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x00007fe721a554e8 in __GI_abort () at abort.c:89
#8  0x00007fe721a970fd in __malloc_assert (assertion=assertion@entry=0x7fe721b85b48 "!newp || ((((mchunkptr)((char*)(newp) - 2*(sizeof(size_t)))))->size & 0x2) || ar_ptr == (((((mchunkptr)((char*)(newp) - 2*(sizeof(size_t)))))->size & 0x4) ? ((heap_info *) ((unsigned long) (((mchunkpt"..., file=file@entry=0x7fe721b81005 "malloc.c", line=line@entry=3033, function=function@entry=0x7fe721b8133e <__func__.11407> "__libc_realloc") at malloc.c:293
#9  0x00007fe721a9b965 in __GI___libc_realloc (oldmem=0x7fe6f40058f0, bytes=226) at malloc.c:3032
#10 0x00007fe7226b2c48 in QString::realloc (this=this@entry=0x2280710, alloc=97) at tools/qstring.cpp:1370
#11 0x00007fe7226b3ddb in QString::realloc (this=this@entry=0x2280710) at tools/qstring.cpp:1380
#12 0x00007fe72270a7e7 in detach (this=0x2280710) at ../../include/QtCore/../../src/corelib/tools/qstring.h:715
#13 data (this=0x2280710) at ../../include/QtCore/../../src/corelib/tools/qstring.h:711
#14 QTextStreamPrivate::flushWriteBuffer (this=0x2280680) at io/qtextstream.cpp:674
#15 0x00007fe722789e11 in QObject::event (this=0x2280688, e=<optimized out>) at kernel/qobject.cpp:1222
#16 0x00007fe722ca048c in QApplicationPrivate::notify_helper (this=this@entry=0x210fa40, receiver=receiver@entry=0x2280688, e=e@entry=0x7fe6f4002100) at kernel/qapplication.cpp:4570
#17 0x00007fe722ca6fa8 in QApplication::notify (this=0x7fff222dfca0, receiver=0x2280688, e=0x7fe6f4002100) at kernel/qapplication.cpp:4356
#18 0x000000000043a632 in _start ()

Possible duplicates by query: bug 348699, bug 347139, bug 347134, bug 347050, bug 346742.

Reported using DrKonqi