Arch Linux

Description: After a complete system update, Falkon fails to load many websites, e.g. Twitter, Facebook, and a few others I've tried (while some others, such as DuckDuckGo, Google, or Wikipedia work fine). Looking at the journal, the culprit seems to be QtWebEngineProc:

Jun 27 07:21:12 lexie kernel: traps: QtWebEngineProc[4910] general protection fault ip:7fe88f7a207c sp:7ffcdcb3b940 error:0 in libQt5WebEngineCore.so.5.12.4[7fe88e955000+4aa0000]
Jun 27 07:21:12 lexie kernel: audit: type=1701 audit(1561612872.471:94): auid=1000 uid=1000 gid=1000 ses=2 pid=4910 comm="QtWebEngineProc" exe="/usr/lib/qt/libexec/QtWebEngineProcess" sig=11 res=1
Jun 27 07:21:12 lexie systemd[1]: Started Process Core Dump (PID 4923/UID 0).
Jun 27 07:21:12 lexie kernel: audit: type=1130 audit(1561612872.481:95): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@11-4923-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jun 27 07:21:12 lexie systemd-coredump[4924]: Core file was truncated to 2097152 bytes.
Jun 27 07:21:12 lexie systemd-coredump[4924]: Process 4910 (QtWebEngineProc) of user 1000 dumped core.

Stack trace of thread 1:
#0 0x00007fe88f7a207c n/a (n/a)
Jun 27 07:21:12 lexie systemd[1]: systemd-coredump@11-4923-0.service: Succeeded.
Jun 27 07:21:12 lexie kernel: audit: type=1131 audit(1561612872.744:96): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@11-4923-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'


Additional info:
* falkon 3.1.0-5
* qt5-webengine 5.12.4-1

Steps to reproduce:
Open https://twitter.com/ in Falkon.