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[Paullux <1926065@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I am using Kubuntu 20.04.2 LTS and i have a bug in a soft what i am
creating.

By default QWebEngine for Qt app dev don't open link in web page with
tarket="_blank" attribute.

So i saw a solution in this forum https://forum.qt.io/topic/93524
/qwebengine-open-links-issue/12

When i would like to reproduce the solution i have crash, a segfault,
with this information :

```
paul@paul-MS-7C79:~/qtcreator_project/dvkbuntu-easy-menu-qt$ catchsegv ./dvkbuntu-easy-menu-qt
Icon theme "Yaru" not found.
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
Segmentation fault (core dumped)
*** Segmentation fault
Register dump:

 RAX: 0000000000000000   RBX: 0000564dfdcaeb80   RCX: 0000000000000000
 RDX: 00000000000003e8   RSI: 0000000000000000   RDI: 00007fff42cb8f78
 RBP: 00007fff42cb8f50   R8 : 0000000000000000   R9 : 0000000000000004
 R10: 0000564dfc33a010   R11: 00007f7e68000080   R12: 00007fff42cb8f78
 R13: 00007fff42cb8fb0   R14: 0000564dfdca5da0   R15: 00007fff42cb8f78
 RSP: 00007fff42cb8f10

 RIP: 00007f7eff17e3b2   EFLAGS: 00010246

 CS: 0033   FS: 0000   GS: 0000

 Trap: 0000000e   Error: 00000004   OldMask: 00000000   CR2: 00000068

 FPUCW: 0000037f   FPUSW: 00000000   TAG: 00007f7f
 RIP: 0597e2c3   RDP: 00000000

 ST(0) 0000 0000000000000000   ST(1) 0000 0000000000000000
 ST(2) 0000 0000000000000000   ST(3) 0000 0000000000000000
 ST(4) 0000 0000000000000000   ST(5) ffff b000000000000000
 ST(6) ffff d000000000000000   ST(7) d000 d000000000000000
 mxcsr: 1fa5
 XMM0:  0000000000000000000000001e848000 XMM1:  0000000000000000000000001e848000
 XMM2:  0000000000000000000000001e848000 XMM3:  0000000000000000000000001e848000
 XMM4:  0000000000000000000000001e848000 XMM5:  0000000000000000000000001e848000
 XMM6:  0000000000000000000000001e848000 XMM7:  0000000000000000000000001e848000
 XMM8:  0000000000000000000000001e848000 XMM9:  0000000000000000000000001e848000
 XMM10: 0000000000000000000000001e848000 XMM11: 0000000000000000000000001e848000
 XMM12: 0000000000000000000000001e848000 XMM13: 0000000000000000000000001e848000
 XMM14: 0000000000000000000000001e848000 XMM15: 0000000000000000000000001e848000

Backtrace:
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(_ZNK15QtWebEngineCore14ProfileAdapter13httpUserAgentEv+0x22)[0x7f7eff17e3b2]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(_ZN15QtWebEngineCore18WebContentsAdapter10initializeEPN7content12SiteInstanceE+0xc9)[0x7f7eff1ab239]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x7f2612)[0x7f7eff1b3612]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x225132d)[0x7f7f00c1232d]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x1f66247)[0x7f7f00927247]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x211f24f)[0x7f7f00ae024f]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x2a7adf8)[0x7f7f0143bdf8]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x2407fc0)[0x7f7f00dc8fc0]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x2428ae1)[0x7f7f00de9ae1]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x2429803)[0x7f7f00dea803]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x242997d)[0x7f7f00dea97d]
/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5(+0x76f7fb)[0x7f7eff1307fb]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN7QObject5eventEP6QEvent+0x1d5)[0x7f7f05d3ccf5]
/lib/x86_64-linux-gnu/libQt5Widgets.so.5(_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent+0x86)[0x7f7f0672aa66]
/lib/x86_64-linux-gnu/libQt5Widgets.so.5(_ZN12QApplication6notifyEP7QObjectP6QEvent+0x330)[0x7f7f067340f0]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent+0x18a)[0x7f7f05d1093a]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData+0x148)[0x7f7f05d135b8]
/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x2def67)[0x7f7f05d68f67]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x27d)[0x7f7efd8b917d]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x52400)[0x7f7efd8b9400]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x33)[0x7f7efd8b94a3]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE+0x65)[0x7f7f05d68565]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE+0x12b)[0x7f7f05d0f4db]
/lib/x86_64-linux-gnu/libQt5Core.so.5(_ZN16QCoreApplication4execEv+0x96)[0x7f7f05d17246]
./dvkbuntu-easy-menu-qt(main+0x6a)[0x564dfbacbaaa]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f7f056c30b3]
./dvkbuntu-easy-menu-qt(+0xabae)[0x564dfbacbbae]
```

So for a week i think that make an error on my code :
https://github.com/handyopensource/dvkbuntu-easy-menu-qt/

but after compiled my soft in Kubuntu 21.04 or on manjaro my soft works
good (not on Kubuntu 20.10).

** Affects: calibre (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1926065

Title:
  QWebEngineProfile Segfault in my soft

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