Arch Linux

Description:
The latest update to webengine broke something. Opening any website causes it to crash with stack trace:
Received signal 4 ILL_ILLOPN 7fa9fbdedfd0
#0 0x7fa9fc26b43e <unknown>
#1 0x7fa9fc26b819 <unknown>
#2 0x7fa9f98010b0 <unknown>
#3 0x7fa9fbdedfd0 <unknown>
#4 0x7fa9fcc43110 <unknown>
#5 0x7fa9fcc43501 <unknown>
#6 0x7fa9fcc41f1c <unknown>
#7 0x7fa9fcc4257c <unknown>
#8 0x7fa9fd41444a <unknown>
#9 0x7fa9fb8eec4e <unknown>
#10 0x7fa9fb8c463f <unknown>
#11 0x7fa9fd42b579 <unknown>
#12 0x7fa9fb88e982 <unknown>
#13 0x7fa9fbfa64a2 <unknown>
#14 0x7fa9fbfc1ebf <unknown>
#15 0x7fa9fbfc6d31 <unknown>
#16 0x7fa9fbfb84dd <unknown>
#17 0x7fa9fb1e2630 <unknown>
#18 0x7fa9fbeee514 <unknown>
#19 0x7fa9fc2dfed9 <unknown>
#20 0x7fa9fc9452c9 <unknown>
#21 0x7fa9fc945b2c <unknown>
#22 0x7fa9fc2dfed9 <unknown>
#23 0x7fa9fc2892a8 <unknown>
#24 0x7fa9fc289f19 <unknown>
#25 0x7fa9fc28a3e2 <unknown>
#26 0x7fa9fc28c409 <unknown>
#27 0x7fa9fc29e6a4 <unknown>
#28 0x7fa9fc288635 <unknown>
#29 0x7fa9fbfdc490 <unknown>
#30 0x7fa9fb42e2fe <unknown>
#31 0x7fa9fb42e7c9 <unknown>
#32 0x7fa9fb42cdf9 <unknown>
#33 0x7fa9fa8b72f4 QtWebEngine::processMain()
#34 0x0000004006d3 <unknown>
#35 0x7fa9f97ee291 __libc_start_main
#36 0x00000040072a <unknown>
r8: 0000000000000000 r9: 0000000000000020 r10: 0000000000000022 r11: 0000000000000206
r12: 0000000000c47850 r13: 0000000000020000 r14: 0000000000c46b00 r15: 00007ffd3c56c9c0
di: 00003d629c501000 si: 000000000001e000 bp: 0000000000bdff40 bx: 0000000000c47858
dx: 0000000000000008 ax: ffffffffffffffff cx: ffffffffffffff88 sp: 00007ffd3c56c830
ip: 00007fa9fbdedfd0 efl: 0000000000010286 cgf: 002b000000000033 erf: 0000000000000000
trp: 0000000000000006 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]

Look like stack corruption. Downgrading to -3 fixes the crash.


Steps to reproduce (needs PyQt)
python -c "from PyQt5.Qt import *; app = QApplication([]); w = QWebEngineView(); w.load(QUrl('https://google.com')); w.show(); app.exec_()"