Application: amarok (2.9.0)
KDE Platform Version: 4.14.38
Qt Version: 4.8.7
Operating System: Linux 4.15.0-66-generic x86_64
Distribution: Ubuntu 18.04.3 LTS

-- Information about the crash:
every time trying to start amarak, ist crashes without any warning

The crash can be reproduced every time.

-- Backtrace:
Application: Amarok (amarok), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
[Current thread is 1 (Thread 0x7f9af7e7fb80 (LWP 3575))]

Thread 30 (Thread 0x7f9a675a6700 (LWP 3704)):
#0  0x00007f9af4a6b839 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f9af5151672 in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f9af514da5d in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x00007f9ac1d51f58 in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9abe547c10 in  () at /usr/lib/kde4/amarok_service_magnatunestore.so
#5  0x00007f9abe548ce8 in  () at /usr/lib/kde4/amarok_service_magnatunestore.so
#6  0x00007f9af00d3c8c in  () at /usr/lib/libthreadweaver.so.4
#7  0x00007f9af00d3ea5 in ThreadWeaver::Job::execute(ThreadWeaver::Thread*) () at /usr/lib/libthreadweaver.so.4
#8  0x00007f9af00d3533 in ThreadWeaver::Thread::run() () at /usr/lib/libthreadweaver.so.4
#9  0x00007f9af5152e3c in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007f9af30c76db in start_thread (arg=0x7f9a675a6700) at pthread_create.c:463
#11 0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 29 (Thread 0x7f9a67da7700 (LWP 3703)):
[KCrash Handler]
#6  0x00007f9af4a01800 in __strnlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:117
#7  0x00007f9ac1d78a78 in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#8  0x00007f9ac1d795bb in my_vsnprintf_ex () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#9  0x00007f9ac1d81199 in my_printf_error () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#10 0x00007f9ac1f7887a in Group_check::check_query(THD*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#11 0x00007f9ac1e4a760 in st_select_lex::check_only_full_group_by(THD*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#12 0x00007f9ac1e4b8c5 in st_select_lex::apply_local_transforms(THD*, bool) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#13 0x00007f9ac1e4c979 in st_select_lex::prepare(THD*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#14 0x00007f9ac1e514d2 in handle_query(THD*, LEX*, Query_result*, unsigned long long, unsigned long long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#15 0x00007f9ac1d2f6dd in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#16 0x00007f9ac1e230b6 in mysql_execute_command(THD*, bool) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#17 0x00007f9ac1e24c1d in mysql_parse(THD*, Parser_state*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#18 0x00007f9ac1e25b40 in dispatch_command(THD*, COM_DATA const*, enum_server_command) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#19 0x00007f9ac1db9c80 in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#20 0x00007f9ac1d588e7 in mysql_send_query () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#21 0x00007f9ac1d58951 in mysql_real_query () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#22 0x00007f9ac1d51d96 in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#23 0x00007f9af76baf08 in Collections::ServiceSqlCollection::query(QString const&) () at /usr/lib/libamaroklib.so.1
#24 0x00007f9af76c1cbd in  () at /usr/lib/libamaroklib.so.1
#25 0x00007f9af00d3c8c in  () at /usr/lib/libthreadweaver.so.4
#26 0x00007f9af00d3ea5 in ThreadWeaver::Job::execute(ThreadWeaver::Thread*) () at /usr/lib/libthreadweaver.so.4
#27 0x00007f9af00d3533 in ThreadWeaver::Thread::run() () at /usr/lib/libthreadweaver.so.4
#28 0x00007f9af5152e3c in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#29 0x00007f9af30c76db in start_thread (arg=0x7f9a67da7700) at pthread_create.c:463
#30 0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7f9a84de6700 (LWP 3702)):
#0  0x00007f9af4a64bf9 in __GI___poll (fds=0x7f9a60004380, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f9aec58c5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9aec58c6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9af529322e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f9af526112f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5  0x00007f9af5261495 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6  0x00007f9af5150549 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7  0x00007f9af52411c3 in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8  0x00007f9af5152e3c in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f9af30c76db in start_thread (arg=0x7f9a84de6700) at pthread_create.c:463
#10 0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7f9a855e7700 (LWP 3701)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a855e6840, expected=0, futex_word=0x5579da452e70) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a855e6840, mutex=0x5579da452e20, cond=0x5579da452e48) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579da452e48, mutex=0x5579da452e20, abstime=0x7f9a855e6840) at pthread_cond_wait.c:667
#3  0x00007f9af5153384 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4  0x00007f9af777957f in AbstractDirectoryWatcher::run() () at /usr/lib/libamaroklib.so.1
#5  0x00007f9af00d3c8c in  () at /usr/lib/libthreadweaver.so.4
#6  0x00007f9af00d3ea5 in ThreadWeaver::Job::execute(ThreadWeaver::Thread*) () at /usr/lib/libthreadweaver.so.4
#7  0x00007f9af00d3533 in ThreadWeaver::Thread::run() () at /usr/lib/libthreadweaver.so.4
#8  0x00007f9af5152e3c in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9  0x00007f9af30c76db in start_thread (arg=0x7f9a855e7700) at pthread_create.c:463
#10 0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7f9a85ffb700 (LWP 3691)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2fe98) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2fe48, cond=0x5579d9c2fe70) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2fe70, mutex=0x5579d9c2fe48) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac26b5a9b in buf_resize_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a85ffb700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7f9a867fc700 (LWP 3690)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a867fb7a0, expected=0, futex_word=0x5579da3e0488) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a867fb7a0, mutex=0x5579da3e0438, cond=0x5579da3e0460) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579da3e0460, mutex=0x5579da3e0438, abstime=0x7f9a867fb7a0) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac264f808 in ib_wqueue_timedwait(ib_wqueue_t*, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9ac2764ee3 in fts_optimize_thread(void*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#7  0x00007f9af30c76db in start_thread (arg=0x7f9a867fc700) at pthread_create.c:463
#8  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7f9a86ffd700 (LWP 3689)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a86ffc920, expected=0, futex_word=0x5579da3a66a8) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a86ffc920, mutex=0x5579da3a6658, cond=0x5579da3a6680) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579da3a6680, mutex=0x5579da3a6658, abstime=0x7f9a86ffc920) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac271a456 in dict_stats_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a86ffd700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7f9a877fe700 (LWP 3688)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2fd78) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2fd28, cond=0x5579d9c2fd50) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2fd50, mutex=0x5579d9c2fd28) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac26c1a0a in buf_dump_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a877fe700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7f9a87fff700 (LWP 3687)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2fbc8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2fb78, cond=0x5579d9c2fba0) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2fba0, mutex=0x5579d9c2fb78) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac25e8216 in srv_worker_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a87fff700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7f9a9497f700 (LWP 3686)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2faa8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2fa58, cond=0x5579d9c2fa80) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2fa80, mutex=0x5579d9c2fa58) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac25e8216 in srv_worker_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a9497f700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7f9a95180700 (LWP 3685)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2fb38) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2fae8, cond=0x5579d9c2fb10) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2fb10, mutex=0x5579d9c2fae8) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac25e8216 in srv_worker_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a95180700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f9a95981700 (LWP 3684)):
#0  0x00007f9af30cd9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5579d9c2fa18) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f9af30cd9f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5579d9c2f9c8, cond=0x5579d9c2f9f0) at pthread_cond_wait.c:502
#2  0x00007f9af30cd9f3 in __pthread_cond_wait (cond=0x5579d9c2f9f0, mutex=0x5579d9c2f9c8) at pthread_cond_wait.c:655
#3  0x00007f9ac252d510 in os_event::wait_low(long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac25ea510 in srv_purge_coordinator_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9af30c76db in start_thread (arg=0x7f9a95981700) at pthread_create.c:463
#6  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f9a96182700 (LWP 3683)):
#0  0x00007f9af4a349d0 in __GI___nanosleep (requested_time=0x7f9a961819c0, remaining=0x0) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
#1  0x00007f9ac253dd8f in os_thread_sleep(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac25ecafb in srv_master_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9af30c76db in start_thread (arg=0x7f9a96182700) at pthread_create.c:463
#4  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f9a96983700 (LWP 3682)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a969829b0, expected=0, futex_word=0x5579d9c2fce8) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a969829b0, mutex=0x5579d9c2fc98, cond=0x5579d9c2fcc0) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579d9c2fcc0, mutex=0x5579d9c2fc98, abstime=0x7f9a969829b0) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25e7275 in srv_monitor_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a96983700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f9a97184700 (LWP 3681)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a97183800, expected=0, futex_word=0x5579d9c2fc58) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a97183800, mutex=0x5579d9c2fc08, cond=0x5579d9c2fc30) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579d9c2fc30, mutex=0x5579d9c2fc08, abstime=0x7f9a97183800) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25eb3b2 in srv_error_monitor_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a97184700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f9a97985700 (LWP 3680)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a97984910, expected=0, futex_word=0x5579da382648) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a97984910, mutex=0x5579da3825f8, cond=0x5579da382620) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579da382620, mutex=0x5579da3825f8, abstime=0x7f9a97984910) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac250b33a in lock_wait_timeout_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a97985700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f9a9838b700 (LWP 3655)):
#0  0x00007f9af30cdf85 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f9a9838a760, expected=0, futex_word=0x5579d9c2fe0c) at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  0x00007f9af30cdf85 in __pthread_cond_wait_common (abstime=0x7f9a9838a760, mutex=0x5579d9c2fdb8, cond=0x5579d9c2fde0) at pthread_cond_wait.c:539
#2  0x00007f9af30cdf85 in __pthread_cond_timedwait (cond=0x5579d9c2fde0, mutex=0x5579d9c2fdb8, abstime=0x7f9a9838a760) at pthread_cond_wait.c:667
#3  0x00007f9ac252d3e2 in os_event::timed_wait(timespec const*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac252d601 in os_event::wait_time_low(unsigned long, long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac26cb7a9 in buf_flush_page_cleaner_coordinator () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9838b700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f9a98b8c700 (LWP 3654)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a98b8c700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f9a9938d700 (LWP 3653)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9938d700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f9a99b8e700 (LWP 3652)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a99b8e700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f9a9a38f700 (LWP 3651)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9a38f700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f9a9ab90700 (LWP 3650)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9ab90700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f9a9b391700 (LWP 3649)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9b391700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f9a9bb92700 (LWP 3648)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9bb92700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f9a9c393700 (LWP 3647)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9c393700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f9a9cb94700 (LWP 3646)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9cb94700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f9a9d395700 (LWP 3645)):
#0  0x00007f9ac135063a in  () at /lib/x86_64-linux-gnu/libaio.so.1
#1  0x00007f9ac25344c1 in LinuxAIOHandler::collect() () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9ac2534ed2 in LinuxAIOHandler::poll(fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#3  0x00007f9ac253c3fd in os_aio_handler(unsigned long, fil_node_t**, void**, IORequest*) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9ac27238ef in fil_aio_wait(unsigned long) () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#5  0x00007f9ac25ee2f8 in io_handler_thread () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#6  0x00007f9af30c76db in start_thread (arg=0x7f9a9d395700) at pthread_create.c:463
#7  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f9abdae7700 (LWP 3644)):
#0  0x00007f9af499026c in __GI___sigtimedwait (set=<optimized out>, info=0x7f9abdae6a00, timeout=0x0) at ../sysdeps/unix/sysv/linux/sigtimedwait.c:42
#1  0x00007f9ac1f200bb in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#2  0x00007f9af30c76db in start_thread (arg=0x7f9abdae7700) at pthread_create.c:463
#3  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f9acd14f700 (LWP 3643)):
#0  0x00007f9adf0c1ace in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#1  0x00007f9adf0c233f in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#2  0x00007f9aeb59c108 in pa_mainloop_dispatch () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007f9aeb59c4de in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f9aeb59c560 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f9aeb5aa3c9 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f9adf0d2318 in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-11.1.so
#7  0x00007f9af30c76db in start_thread (arg=0x7f9acd14f700) at pthread_create.c:463
#8  0x00007f9af4a7188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f9af7e7fb80 (LWP 3575)):
#0  0x00007f9af4a6b839 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f9af5151672 in  () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2  0x00007f9af514da5d in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3  0x00007f9ac1d508ac in  () at /usr/lib/kde4/amarok_storage-mysqlestorage.so
#4  0x00007f9af7685e40 in Podcasts::SqlPodcastProvider::SqlPodcastProvider() () at /usr/lib/libamaroklib.so.1
#5  0x00007f9af77ad10e in PlaylistManager::PlaylistManager() () at /usr/lib/libamaroklib.so.1
#6  0x00007f9af77ad1a3 in PlaylistManager::instance() () at /usr/lib/libamaroklib.so.1
#7  0x00007f9af75fc13d in Playlist::Actions::restoreDefaultPlaylist() () at /usr/lib/libamaroklib.so.1
#8  0x00007f9af75fcce0 in Playlist::Actions::instance() () at /usr/lib/libamaroklib.so.1
#9  0x00007f9af78703bd in MainWindow::createActions() () at /usr/lib/libamaroklib.so.1
#10 0x00007f9af787733c in MainWindow::MainWindow() () at /usr/lib/libamaroklib.so.1
#11 0x00007f9af785df87 in App::continueInit() () at /usr/lib/libamaroklib.so.1
#12 0x00007f9af785f3ac in App::App() () at /usr/lib/libamaroklib.so.1
#13 0x00005579d8a33da3 in  ()
#14 0x00007f9af4971b97 in __libc_start_main (main=0x5579d8a2d980, argc=1, argv=0x7fff32daa1f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff32daa1e8) at ../csu/libc-start.c:310
#15 0x00005579d8a359da in _start ()

Reported using DrKonqi