Bug 418701

Summary:	Crash with "Segmentation fault" navigating to site "python-gtk-3-tutorial.readthedocs.io"
Product:	[Applications] Falkon	Reporter:	Nicolaas <little_addict>
Component:	general	Assignee:	David Rosca <nowrep>
Status:	RESOLVED FIXED
Severity:	crash	CC:	justin.zobel
Priority:	NOR	Keywords:	drkonqi
Version First Reported In:	3.1.0
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Nicolaas 2020-03-10 11:16:00 UTC

Application: falkon (3.1.0)

Qt Version: 5.12.4
Frameworks Version: 5.67.0
Operating System: Linux 5.3.0-40-generic x86_64
Windowing system: X11
Distribution: Ubuntu 19.10

-- Information about the crash:
- What I was doing when the application crashed:
1. Install Falkon 3.1.0-0ubuntu1 from ubuntu-eoan-universe (Ubuntu 19.10) using the "Discover" software.
2. Open Falkon browser.
3. Navigate to the URL "https://python-gtk-3-tutorial.readthedocs.io/en/latest/builder.html".
4. Observe browser close and Crash Reporting Assistant starts.

The crash can be reproduced every time.

-- Backtrace:
Application: Falkon (falkon), 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 0x7f296b4f6f00 (LWP 14786))]

Thread 27 (Thread 0x7f28eed5c700 (LWP 14867)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f28eed5b5d0, clockid=<optimized out>, expected=0, futex_word=0x7f28f0006c04) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f28eed5b5d0, clockid=<optimized out>, mutex=0x7f28f0006bb0, cond=0x7f28f0006bd8) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f28f0006bd8, mutex=0x7f28f0006bb0, abstime=0x7f28eed5b5d0) at pthread_cond_wait.c:656
#3  0x00007f297d698d2c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297d698e7b in QWaitCondition::wait(QMutex*, unsigned long) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297d696421 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7f2915ea6700 (LWP 14866)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f2915ea55d0, clockid=<optimized out>, expected=0, futex_word=0x55bc3a661540) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f2915ea55d0, clockid=<optimized out>, mutex=0x55bc3a6614f0, cond=0x55bc3a661518) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x55bc3a661518, mutex=0x55bc3a6614f0, abstime=0x7f2915ea55d0) at pthread_cond_wait.c:656
#3  0x00007f297d698d2c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297d698e7b in QWaitCondition::wait(QMutex*, unsigned long) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297d696421 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7f28effff700 (LWP 14815)):
#0  0x00007f29756312c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f28efffe5c8) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f29756312c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7f28efffe578, cond=0x7f28efffe5a0) at pthread_cond_wait.c:508
#2  0x00007f29756312c6 in __pthread_cond_wait (cond=0x7f28efffe5a0, mutex=0x7f28efffe578) at pthread_cond_wait.c:638
#3  0x00007f297868a03d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aac0 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868ab63 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c718 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f318 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7f2914c97700 (LWP 14814)):
#0  0x00007f297d31765e in epoll_wait (epfd=72, events=0x7f28dc002050, maxevents=32, timeout=19557) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00007f29744602c5 in  () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#2  0x00007f2974456114 in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2978690564 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7f2915498700 (LWP 14813)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f2915497470, clockid=<optimized out>, expected=0, futex_word=0x7f29154975b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f2915497470, clockid=<optimized out>, mutex=0x7f2915497568, cond=0x7f2915497590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f2915497590, mutex=0x7f2915497568, abstime=0x7f2915497470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868aba6 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c705 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f258 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7f29166a7700 (LWP 14811)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f28f0074520, nfds=3, timeout=132367) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2974e9ba3e in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2974e9bb73 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f297d8b1635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297d8585cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297d691a45 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 21 (Thread 0x7f2916ffd700 (LWP 14810)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f28f80025e0, nfds=1, timeout=9990) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2974e9ba3e in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2974e9bb73 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f297d8b1635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297d8585cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297d691a45 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7f29177fe700 (LWP 14809)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f2904007170, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f296026a1c6 in  () at /lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007f296025b831 in pa_mainloop_poll () at /lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007f296025beb3 in pa_mainloop_iterate () at /lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f296025bf60 in pa_mainloop_run () at /lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f296026a10d in  () at /lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f296020837c in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-13.0.so
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7f2917fff700 (LWP 14808)):
#0  0x00007f297d31765e in epoll_wait (epfd=42, events=0x7f2910002050, maxevents=32, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00007f29744602c5 in  () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#2  0x00007f2974456114 in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f297869047d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7f2934ff9700 (LWP 14807)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f2934ff8470, clockid=<optimized out>, expected=0, futex_word=0x7f2934ff85b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f2934ff8470, clockid=<optimized out>, mutex=0x7f2934ff8568, cond=0x7f2934ff8590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f2934ff8590, mutex=0x7f2934ff8568, abstime=0x7f2934ff8470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f2978607ce8 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7f29357fa700 (LWP 14806)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f29357f9470, clockid=<optimized out>, expected=0, futex_word=0x7f29357f95b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f29357f9470, clockid=<optimized out>, mutex=0x7f29357f9568, cond=0x7f29357f9590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f29357f9590, mutex=0x7f29357f9568, abstime=0x7f29357f9470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f2978607ce8 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7f2935ffb700 (LWP 14805)):
#0  0x00007f29756312c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bc33b74168) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f29756312c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bc33b740a8, cond=0x55bc33b74140) at pthread_cond_wait.c:508
#2  0x00007f29756312c6 in __pthread_cond_wait (cond=0x55bc33b74140, mutex=0x55bc33b740a8) at pthread_cond_wait.c:638
#3  0x00007f297868a03d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f2978f60598 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297865d243 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7f29367fc700 (LWP 14804)):
#0  0x00007f29756312c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f29367fb5c8) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f29756312c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7f29367fb578, cond=0x7f29367fb5a0) at pthread_cond_wait.c:508
#2  0x00007f29756312c6 in __pthread_cond_wait (cond=0x7f29367fb5a0, mutex=0x7f29367fb578) at pthread_cond_wait.c:638
#3  0x00007f297868a03d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aac0 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868ab63 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c718 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f2b8 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7f2936ffd700 (LWP 14803)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f2936ffc470, clockid=<optimized out>, expected=0, futex_word=0x7f2936ffc5b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f2936ffc470, clockid=<optimized out>, mutex=0x7f2936ffc568, cond=0x7f2936ffc590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f2936ffc590, mutex=0x7f2936ffc568, abstime=0x7f2936ffc470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868aba6 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c705 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f258 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f29377fe700 (LWP 14802)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f29377fd470, clockid=<optimized out>, expected=0, futex_word=0x7f29377fd5b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f29377fd470, clockid=<optimized out>, mutex=0x7f29377fd568, cond=0x7f29377fd590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f29377fd590, mutex=0x7f29377fd568, abstime=0x7f29377fd470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868aba6 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c705 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f258 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f2937fff700 (LWP 14801)):
#0  0x00007f297d30d29b in __GI___select (nfds=40, readfds=0x7f2937ffe620, writefds=0x0, exceptfds=0x0, timeout=0x0) at ../sysdeps/unix/sysv/linux/select.c:41
#1  0x00007f29785ef374 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#4  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f2958ff9700 (LWP 14800)):
[KCrash Handler]
#6  0x00007f297d6931e6 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f297d74ad5f in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f297d74e61c in QRegularExpression::match(QString const&, int, QRegularExpression::MatchType, QFlags<QRegularExpression::MatchOption>) const () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f297e2a9000 in AdBlockRule::stringMatch(QString const&, QString const&) const () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#10 0x00007f297e2a9220 in AdBlockRule::networkMatch(QWebEngineUrlRequestInfo const&, QString const&, QString const&) const () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#11 0x00007f297e2a6284 in AdBlockMatcher::match(QWebEngineUrlRequestInfo const&, QString const&, QString const&) const () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#12 0x00007f297e2a1afb in AdBlockManager::block(QWebEngineUrlRequestInfo&, QString&, QString&) () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#13 0x00007f297e29d229 in AdBlockUrlInterceptor::interceptRequest(QWebEngineUrlRequestInfo&) () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#14 0x00007f297e34d67c in NetworkUrlInterceptor::interceptRequest(QWebEngineUrlRequestInfo&) () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#15 0x00007f2976a762a2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#16 0x00007f297898f2c4 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#17 0x00007f2978ae6190 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#18 0x00007f2978ae6375 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#19 0x00007f2978ae96a8 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#20 0x00007f29782209dc in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#21 0x00007f2978220e30 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#22 0x00007f297821eec2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#23 0x00007f29782063ad in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#24 0x00007f2976b8ec8f in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#25 0x00007f29788fd5ad in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#26 0x00007f2978900ecb in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#27 0x00007f2978905b86 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#28 0x00007f29788faaff in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#29 0x00007f29788fae1c in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#30 0x00007f29789162c0 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#31 0x00007f297891657d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#32 0x00007f2977391867 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#33 0x00007f2977391173 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#34 0x00007f297738de7a in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#35 0x00007f2977384d9c in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#36 0x00007f29773776ab in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#37 0x00007f297739a660 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#38 0x00007f2978692bd7 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#39 0x00007f29744558f8 in  () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#40 0x00007f297445633f in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#41 0x00007f2978690429 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#42 0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#43 0x00007f2977fd9c18 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#44 0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#45 0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#46 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#47 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f29597fa700 (LWP 14799)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f29597f9470, clockid=<optimized out>, expected=0, futex_word=0x7f29597f95b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f29597f9470, clockid=<optimized out>, mutex=0x7f29597f9568, cond=0x7f29597f9590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f29597f9590, mutex=0x7f29597f9568, abstime=0x7f29597f9470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868aba6 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c705 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f258 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f2959ffb700 (LWP 14798)):
#0  0x00007f29756316e0 in futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f2959ffa470, clockid=<optimized out>, expected=0, futex_word=0x7f2959ffa5b8) at ../sysdeps/unix/sysv/linux/futex-internal.h:208
#1  0x00007f29756316e0 in __pthread_cond_wait_common (abstime=0x7f2959ffa470, clockid=<optimized out>, mutex=0x7f2959ffa568, cond=0x7f2959ffa590) at pthread_cond_wait.c:520
#2  0x00007f29756316e0 in __pthread_cond_timedwait (cond=0x7f2959ffa590, mutex=0x7f2959ffa568, abstime=0x7f2959ffa470) at pthread_cond_wait.c:656
#3  0x00007f297868a10b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868aab2 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297868aba6 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297864c705 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297864ef96 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297864f258 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#9  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#10 0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f295a7fc700 (LWP 14797)):
#0  0x00007f297d31765e in epoll_wait (epfd=21, events=0x7f294c002040, maxevents=32, timeout=530776) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00007f29744602c5 in  () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#2  0x00007f2974456114 in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f2978690564 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f2978652e38 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#8  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f295affd700 (LWP 14796)):
#0  0x00007f297d31765e in epoll_wait (epfd=25, events=0x7f2944002050, maxevents=32, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
#1  0x00007f29744602c5 in  () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#2  0x00007f2974456114 in event_base_loop () at /lib/x86_64-linux-gnu/libevent-2.1.so.6
#3  0x00007f297869047d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f2978629f0b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297865bd9b in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#6  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#7  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f295b7fe700 (LWP 14795)):
#0  0x00007f297d2daa86 in __GI___waitpid (pid=14792, stat_loc=0x7f295b7fd4a4, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30
#1  0x00007f2978686356 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f2978687718 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f297868785d in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#5  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f295bfff700 (LWP 14790)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f295bffe490, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f297834f8ea in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#2  0x00007f297865d243 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#3  0x00007f297868cc75 in  () at /lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
#4  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#5  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f2961f87700 (LWP 14789)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f2954020670, nfds=4, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f2974e9ba3e in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2974e9bb73 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f297d8b1635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297d8585cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297d691a45 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f297cd44efa in  () at /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f29689dc700 (LWP 14788)):
#0  0x00007f29756312c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bc33878f9c) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f29756312c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bc33878f48, cond=0x55bc33878f70) at pthread_cond_wait.c:508
#2  0x00007f29756312c6 in __pthread_cond_wait (cond=0x55bc33878f70, mutex=0x55bc33878f48) at pthread_cond_wait.c:638
#3  0x00007f296381eaab in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007f296381e6cb in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f296a8d9700 (LWP 14787)):
#0  0x00007f297d30ac2f in __GI___poll (fds=0x7f296a8d85a8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f297cddd917 in  () at /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f297cddf53a in xcb_wait_for_event () at /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f296ae37288 in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f297d692c92 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f297562a669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f297d317323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f296b4f6f00 (LWP 14786)):
#0  0x00007f297d31094d in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f297d692f35 in QBasicMutex::lockInternal() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f297e2a12c9 in AdBlockManager::updateMatcher() () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#3  0x00007f297d885558 in QMetaObject::activate(QObject*, int, int, void**) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f297e2abba9 in AdBlockSubscription::subscriptionDownloaded() () at /lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#5  0x00007f297d885558 in QMetaObject::activate(QObject*, int, int, void**) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f2975cdea6c in  () at /lib/x86_64-linux-gnu/libQt5Network.so.5
#7  0x00007f2975d8fa8e in  () at /lib/x86_64-linux-gnu/libQt5Network.so.5
#8  0x00007f297d885e4a in QObject::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f297dc85a86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007f297dc8ee00 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x00007f297d859a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f297d85c6a8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f297d8b2037 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f2974e9b84d in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f2974e9bad0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007f2974e9bb73 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007f297d8b1635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f297d8585cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f297d860336 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x000055bc31e408fa in  ()
#21 0x00007f297d21c1e3 in __libc_start_main (main=0x55bc31e40660, argc=1, argv=0x7ffdbacec5d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdbacec5c8) at ../csu/libc-start.c:308
#22 0x000055bc31e40bfa in _start ()
[Inferior 1 (process 14786) detached]

Possible duplicates by query: bug 411068, bug 410587, bug 410351.

Reported using DrKonqi

Comment 1 Justin Zobel 2020-10-25 06:46:12 UTC

I've just tested on Falkon 3.1.0 with:
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2

I cannot replicate the issue, I navigated to the page, scrolled through, went to next document and then back without any crash.

Nicolaas can you please re-test and confirm if this issue is still occurring for you.

Comment 2 Nicolaas 2020-10-25 19:26:35 UTC

Confirmation Testing Results: PASS
====================================

STEPS:
1. Open Falkon browser.
2. Navigate to the URL "https://python-gtk-3-tutorial.readthedocs.io/en/latest/builder.html".
3. Refreshed
4. Navigated to other pages on domain

====================================

NOTE: A lot of things got updated since issue was raised. See below.

@Justin: Thank you for looking into this. Much appreciated.

====================================
Application version 3.1.0
QtWebEngine version 5.12.8
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Falkon/3.1.0 Chrome/69.0.3497.128 Safari/537.36

*UPDATED: Operating System: Ubuntu 20.04
KDE Plasma Version: 5.18.5
*UPDATED: KDE Frameworks Version: 5.68.0
*UPDATED: Qt Version: 5.12.8
*UPDATED: Kernel Version: 5.4.0-51-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i3 CPU M 350 @ 2.27GHz
Memory: 7,6 GiB of RAM