[SRU] nextcloud crashed with SIGSEGV.

Confirmed. Since the latest update to 3.1.1-1ubuntu1 nextcloud desktop is segfaulting.

Status changed to 'Confirmed' because the bug affects multiple users.

I'm having this issue as well. Here's a backtrace from GDB, with some debug symbols:

(gdb) bt
#0 doActivate<false> (sender=0x0, signal_index=9, argv=argv@entry=0x7fffffffb9a0) at kernel/qobject.cpp:3768
#1 0x00007fffeafb5cb8 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fffebed30a0 <QGuiApplication::staticMetaObject>, local_signal_index=local_signal_index@entry=1,
    argv=argv@entry=0x7fffffffb9a0) at kernel/qobject.cpp:3946
#2 0x00007fffeb9515a6 in QGuiApplication::screenAdded (this=<optimized out>, _t1=<optimized out>, _t1@entry=0x5555558b3cf0) at .moc/moc_qguiapplication.cpp:389
#3 0x00007fffeb936d80 in QWindowSystemInterface::handleScreenAdded (ps=ps@entry=0x5555558a5850, isPrimary=<optimized out>) at kernel/qwindowsysteminterface.cpp:826
#4 0x00007fffdef2d540 in QXcbConnection::initializeScreens (this=this@entry=0x555555893950) at qxcbconnection_screens.cpp:413
#5 0x00007fffdef082a4 in QXcbConnection::QXcbConnection (this=0x555555893950, nativeInterface=<optimized out>, canGrabServer=<optimized out>, defaultVisualId=<optimized out>, displayName=<optimized out>)
    at qxcbconnection.cpp:103
#6 0x00007fffdef0b10f in QXcbIntegration::QXcbIntegration (this=0x555555893830, parameters=..., argc=<optimized out>, argv=<optimized out>) at qxcbintegration.cpp:197
#7 0x00007ffff7fb9593 in QXcbIntegrationPlugin::create (this=<optimized out>, system=..., argv=0x7fffffffd868, argc=@0x7fffffffd60c: 1, parameters=...) at qxcbmain.cpp:56
#8 QXcbIntegrationPlugin::create (this=<optimized out>, system=..., parameters=..., argc=@0x7fffffffd60c: 1, argv=0x7fffffffd868) at qxcbmain.cpp:53
#9 0x00007fffeb9559fc in init_platform (argv=<optimized out>, argc=@0x7fffffffd60c: 1, platformThemeName=..., platformPluginPath=..., pluginNamesWithArguments=...) at kernel/qguiapplication.cpp:1223
#10 QGuiApplicationPrivate::createPlatformIntegration (this=0x555555887e20) at kernel/qguiapplication.cpp:1481
#11 0x00007fffeb956e88 in QGuiApplicationPrivate::createEventDispatcher (this=<optimized out>) at kernel/qguiapplication.cpp:1498
#12 0x00007fffeaf8be46 in QCoreApplicationPrivate::init (this=this@entry=0x555555887e20) at kernel/qcoreapplication.cpp:834
#13 0x00007fffeb959e02 in QGuiApplicationPrivate::init (this=0x555555887e20) at kernel/qguiapplication.cpp:1527
#14 0x00007fffef2f5fed in QApplicationPrivate::init() () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x000055555571c68b in SharedTools::QtSingleApplication::QtSingleApplication (this=<optimized out>, appId=..., argc=<optimized out>, argv=<optimized out>, this=<optimized out>, appId=...,
    argc=<optimized out>, argv=<optimized out>) at ./src/3rdparty/qtsingleapplication/qtsingleapplication.cpp:56
#16 0x000055555563d30c in OCC::Application::Application (this=<optimized out>, argc=<optimized out>, argv=<optimized out>, this=<optimized out>, argc=<optimized out>, argv=<optimized out>)
    at ./src/gui/application.cpp:116
#17 0x00005555556093c7 in main (argc=<optimized out>, argv=0x7fffffffd868) at ./src/gui/main.cpp:80

As you can see, the "sender" argument to qobject.cpp's doActivate function is NULL, which it's not supposed to be. The first line of that function is line 376...

I have updated to version 3.2.0-20210410.072919.14fbf1b10-1.0~hirsute1 from http://ppa.launchpad.net/nextcloud-devs/client/ubuntu

But nextcloud-desktop is still segfaulting.

Maybe this is not caused by the nextcloud client itself but by some (qt?) library the client is using?

(Version 3.2.0 is working on previous Ubuntu versions - older than hirsute)

i tried with the appimage version of the client and that works ootb with the user configs etc.

wget https://github.com/nextcloud/desktop/releases/download/v3.2.0/Nextcloud-3.2.0-x86_64.AppImage
chmod +x Nextcloud-3.2.0-x86_64.AppImage
./Nextcloud-3.2.0-x86_64.AppImage

So something is broken on the packaged version in the repos.

I have the same issue in Wayland.

Program received signal SIGSEGV, Segmentation fault.
doActivate<false> (sender=0x0, signal_index=9, argv=0x7fffffffb1f0) at kernel/qobject.cpp:3768
3768 kernel/qobject.cpp: No such file or directory.
(gdb) bt
#0 doActivate<false>(QObject*, int, void**) (sender=0x0, signal_index=9, argv=0x7fffffffb1f0)
    at kernel/qobject.cpp:3768
#1 0x00007fffeb9745a6 in QGuiApplication::screenAdded(QScreen*) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#2 0x00007fffde7464f8 in QtWaylandClient::QWaylandDisplay::handleScreenInitialized(QtWaylandClient::QWaylandScreen*) () at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#3 0x00007fffde74fa07 in QtWaylandClient::QWaylandScreen::maybeInitialize() ()
    at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#4 0x00007fffea120249 in () at /lib/x86_64-linux-gnu/libffi.so.8
#5 0x00007fffea11f639 in () at /lib/x86_64-linux-gnu/libffi.so.8
#6 0x00007fffde6c4502 in () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#7 0x00007fffde6c0aea in () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#8 0x00007fffde6c21dc in wl_display_dispatch_queue_pending () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#9 0x00007fffde746145 in QtWaylandClient::QWaylandDisplay::forceRoundTrip() ()
    at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#10 0x00007fffde746c94 in QtWaylandClient::QWaylandDisplay::registry_global(unsigned int, QString const&, unsigned int) () at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#11 0x00007fffde767cce in QtWayland::wl_registry::handle_global(void*, wl_registry*, unsigned int, char const*, unsigned int) () at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#12 0x00007fffea120249 in () at /lib/x86_64-linux-gnu/libffi.so.8
#13 0x00007fffea11f639 in () at /lib/x86_64-linux-gnu/libffi.so.8
#14 0x00007fffde6c4502 in () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#15 0x00007fffde6c0aea in () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#16 0x00007fffde6c21dc in wl_display_dispatch_queue_pending () at /lib/x86_64-linux-gnu/libwayland-client.so.0
#17 0x00007fffde746145 in QtWaylandClient::QWaylandDisplay::forceRoundTrip() ()
    at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#18 0x00007fffde7463fa in QtWaylandClient::QWaylandDisplay::QWaylandDisplay(QtWaylandClient::QWaylandIntegration*)
    () at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#19 0x00007fffde73984f in QtWaylandClient::QWaylandIntegration::QWaylandIntegration() ()
    at /lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#20 0x00007ffff7fbd53b in () at /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqwayland-generic.so
#21 0x00007fffeb9789fc in QGuiApplicationPrivate::createPlatformIntegration() ()
    at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00007fffeb979e88 in QGuiApplicationPrivate::createEventDispatcher() () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#23 0x00007fffeafaee46 in QCoreApplicationPrivate::init() (this=<optimized out>) at kernel/qcoreapplication.cpp:834
#24 0x00007fffeb97ce02 in QGuiApplicationPrivate::init() () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#25 0x00007fffef318fed in QApplicationPrivate::init() () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00005555557...

This problem exists on X, too -- not only on Wayland.

I have the same bug, nextcloud-devs ppa is also concerned by the problem.
After manually installed nextcloud 3.1.1 debian unstable packages, nextcloud-desktop works.
I think there is maybe something wrong with compilation (lto?).

I do not get the crash on arm, this is a raspberry pi 400 machine.

$ lsb_release -rd
Description: Ubuntu 21.04
Release: 21.04

$ apt-cache policy nextcloud-desktop
nextcloud-desktop:
  Installed: 3.1.1-1ubuntu1
  Candidate: 3.1.1-1ubuntu1
  Version table:
 *** 3.1.1-1ubuntu1 500
        500 http://ports.ubuntu.com/ubuntu-ports hirsute/universe arm64 Packages
        100 /var/lib/dpkg/status

nextcloud 3.1.1 debian unstable packages works for me too (amd64)

can confirm that with libnextcloudsync0_3.1.1-1_amd64.deb and nextcloud-desktop_3.1.1-1_amd64.deb from debian bullseye it works again.

What i noticed is, that the Ubuntu Version of the package has two dependencies, that the Debian version does not have:
- libqt5websockets5
- qml-module-qtqml

So the segfault might be in one of these and not the nextcloud code itself.

https://github.com/nextcloud/desktop/issues/3090

This appears to be due to building with LTO enabled on amd64

https://github.com/nextcloud/desktop/issues/2790

Test rebuild of the hirsute package is done with LTO disabled. Can be tested from

sudo add-apt-repository ppa:rikmills/nexcloud-no-lto
sudo apt-get update

(yes I did make a typo when doing the ppa name)

I got the following error, fixed by moving ~/.config/Nextcloud

2021-04-22 12:46:20:892 [ fatal default ]: ENFORCE: "allow_failure" in file ./src/common/ownsql.cpp, line 265 with message: SQLITE Prepare error
Aborted (core dumped)

The startup SEGFAULT is gone in the no-lto build

the issue in Comment 18 comes from mixing higher versioned clients, they are not downgradeable.

"That is because the sync database of 3.2.0-rc3 and 3.1.3 are incompatible. In general it is not supported to downgrade. To recover from that you need to delete the sync database while the client is not running. The sync database are the files beginning with ._sync* in your sync folder. The client will generate a new sync database on restart." from https://github.com/nextcloud/desktop/issues/2790#issuecomment-811872914

The latest version from http://ppa.launchpad.net/nextcloud-devs/client does work again.
3.2.0-20210422.142324.14fbf1b10-1.0~hirsute1 fixed it.

Fixed be config in build, see https://github.com/nextcloud/desktop/issues/3090#issuecomment-824920281

This bug is tracking the version in the main Ubuntu archive for hirsute, so it is not fix released yet. A fixed version is awaiting review by the sru team.

Hello Paul, or anyone else affected,

Accepted nextcloud-desktop into hirsute-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/nextcloud-desktop/3.1.1-1ubuntu1.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-hirsute to verification-done-hirsute. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-hirsute. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

i grabbed the packages right from the launchpad building page and installed them:
libnextcloudsync0_3.1.1-1ubuntu1.1_amd64.deb
nextcloud-desktop_3.1.1-1ubuntu1.1_amd64.deb
nextcloud-desktop-common_3.1.1-1ubuntu1.1_all.deb
nextcloud-desktop-l10n_3.1.1-1ubuntu1.1_all.deb
nextcloud-desktop-doc_3.1.1-1ubuntu1.1_all.deb

The nextcloud desktop client now starts as intended. No segfault anymore.

$ apt-cache policy nextcloud-desktop
nextcloud-desktop:
  Installed: 3.1.1-1ubuntu1.1
  Candidate: 3.1.1-1ubuntu1.1
  Version table:
 *** 3.1.1-1ubuntu1.1 500
        500 http://gb.archive.ubuntu.com/ubuntu hirsute-proposed/universe amd64 Packages
        100 /var/lib/dpkg/status
     3.1.1-1ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu hirsute/universe amd64 Packages

Works for me.

Confirmed also, now starts as normal. Thanks for the fix.

$ apt-cache policy nextcloud-desktop
nextcloud-desktop:
  Installed: 3.1.1-1ubuntu1.1
  Candidate: 3.1.1-1ubuntu1.1
  Version table:
 *** 3.1.1-1ubuntu1.1 500
        500 http://gb.archive.ubuntu.com/ubuntu hirsute-proposed/universe amd64 Packages
        100 /var/lib/dpkg/status
     3.1.1-1ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu hirsute/universe amd64 Packages

This bug was fixed in the package nextcloud-desktop - 3.1.1-1ubuntu1.1

---------------
nextcloud-desktop (3.1.1-1ubuntu1.1) hirsute; urgency=medium

  * Disable building with LTO to fix segfault on startup (LP: #1923053)

 -- Rik Mills <email address hidden> Thu, 22 Apr 2021 15:21:37 +0100

This is not released to updates yet. The message in #28 was due some of these packages in hirsute-proposed being wrongly copied to impish.

Version 3.1.1-1ubuntu1 not work for me in hirsute.

                Stack trace of thread 7682:
                #0 0x00007fd1dc94263f n/a (libQt5Core.so.5 + 0x2ee63f)
                #1 0x00007fd1dd2d75a6 _ZN15QGuiApplication11screenAddedEP7QScreen (libQt5Gui.so.5 + 0x1345a6)
                #2 0x00007fd1dd2bcd80 _ZN22QWindowSystemInterface17handleScreenAddedEP15QPlatformScreenb (libQt5Gui.so.5 + 0x119d80)
                #3 0x00007fd1d050f540 _ZN14QXcbConnection17initializeScreensEv (libQt5XcbQpa.so.5 + 0x72540)
                #4 0x00007fd1d04ea2a4 _ZN14QXcbConnectionC2EP19QXcbNativeInterfacebjPKc (libQt5XcbQpa.so.5 + 0x4d2a4)
                #5 0x00007fd1d04ed10f _ZN15QXcbIntegrationC2ERK11QStringListRiPPc (libQt5XcbQpa.so.5 + 0x5010f)
                #6 0x00007fd1e9933593 n/a (libqxcb.so + 0x2593)
                #7 0x00007fd1dd2db9fc _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5 + 0x1389fc)
                #8 0x00007fd1dd2dce88 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5 + 0x139e88)
                #9 0x00007fd1dc911e46 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5 + 0x2bde46)
                #10 0x00007fd1dd2dfe02 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5 + 0x13ce02)
                #11 0x00007fd1e0c7bfed _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5 + 0x170fed)
                #12 0x000056345e20868b _ZN11SharedTools19QtSingleApplicationC1ERK7QStringRiPPc (nextcloud + 0x1c868b)
                #13 0x000056345e12930c _ZN3OCC11ApplicationC2ERiPPc (nextcloud + 0xe930c)
                #14 0x000056345e0f53c7 main (nextcloud + 0xb53c7)
                #15 0x00007fd1dc10e565 __libc_start_main (libc.so.6 + 0x28565)
                #16 0x000056345e0f5abe _start (nextcloud + 0xb5abe)

Going by the coredumpctl generated ST, this may be a different bug. More than happy to open a separate bug and supply more information, just let me know.

On 24/04/2021 06:01, monochromec wrote:
> Version 3.1.1-1ubuntu1 not work for me in hirsute.

Well, it wouldn't, as the fixed version in proposed is 3.1.1-1ubuntu1.1

Your ST of the original broken 3.1.1-1ubuntu1 does appear to be this issue.

I can't find the package in proposed, what happened?

On 25/04/2021 18:54, Rüdiger Kupper wrote:
> I can't find the package in proposed, what happened?
Seems to have been an mistaken casualty of setting up the new 'impish'
repos.

It is in the queue to be copied back into hirsute-proposed

https://launchpad.net/ubuntu/hirsute/+queue?queue_state=1&queue_text=

but that needs approval from admins, so could have to wait until Monday
morning.

All right, thanks!

$ apt-cache policy nextcloud-desktop
nextcloud-desktop:
  Installed: 3.2.0-20210422.142324.14fbf1b10-1.0~hirsute1
  Candidate: 3.2.0-20210422.142324.14fbf1b10-1.0~hirsute1
  Version table:
 *** 3.2.0-20210422.142324.14fbf1b10-1.0~hirsute1 500
        500 http://ppa.launchpad.net/nextcloud-devs/client/ubuntu hirsute/main amd64 Packages
        100 /var/lib/dpkg/status
     3.1.1-1ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu hirsute/universe amd64 Packages

Testing done:

- Client started OK
- Create a local file, sync to server OK
- Create a file on server, sync to local OK
- Modified local file, sync to server OK
- Main dialog shows OK
- Settings dialog shows OK
- Pause sync for all, Resume sync for all OK
- Server status (originally saying Offline, then once logged onto server via web shows Online) OK

nextcloud-desktop is back in hirsute-proposed, testing. Here's what I see:
The client starts up and sync seems to work, but the main window ist next to unusable. Window shows, but has no title bar. Erratically, it switches to some text output and back again. The window cannot be moved, unless you hold the super-key. Soon, it disappears unexpectedly.

There's definitively something wrong with the graphics toolkit, but sync seems to work.

No problems with the UI here

Interesting. Here's how it looks on my desktop. The netcloud window disappears as soon as I click anywhere on the desktop.

Interesting. Here's how it looks on my desktop. The netcloud window disappears as soon as I click anywhere on the desktop.

That is a system tray notification popup, and exactly how it should look. If you have issues with it, please report another bug once this update is out. That is certainly related to the fix here, which in essence is just reverting to how the desktop client was compiled in other releases to fix the segfault on startup.

Correction: certainly NOT related

(Sorry for the double posting.)
Yes, I now see how this is to be meant, but it's not a direct popup but what you see when you select "Main Window" *from* the popup menu. – Anyway, unrelated to this issue, you are right, thanks!

I tried the proposed update. The client now starts without segmentation fault, but it crashes while syncing some files. I guess, this is not directly related to the package in proposed but to the fact, that I used the AppImage from Nextcloud in the meantime…

$ dpkg -l | grep nextcloud | cut -c1-80
ii libnextcloudsync0:amd64 3.1.1-1ubuntu1.1
ii nautilus-nextcloud 3.1.1-1ubuntu1.1
ii nextcloud-desktop 3.1.1-1ubuntu1.1
ii nextcloud-desktop-common 3.1.1-1ubuntu1.1
ii nextcloud-desktop-doc 3.1.1-1ubuntu1.1
ii nextcloud-desktop-l10n 3.1.1-1ubuntu1.1

$ nextcloud
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
2021-04-28 08:08:39:020 [ fatal default ]: ENFORCE: "allow_failure" in file ./src/common/ownsql.cpp, line 265 with message: SQLITE Prepare error
Aborted (core dumped)

The AppImage-Client which is the 3.2-release works and syncs…

$ ./Downloads/Nextcloud-3.2.0-x86_64.AppImage
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.

I guess the SQLite schema has changed between 3.1.1 and 3.2…

Aiko

Ok. In addition to comment #43:

I bravely removed the sync DB files in the Nextcloud directory. The proposed client does not crash anymore. It does a full resync though. But the 3.1.1-1ubuntu1.1 release works at least.

This bug was fixed in the package nextcloud-desktop - 3.1.1-1ubuntu1.1

---------------
nextcloud-desktop (3.1.1-1ubuntu1.1) hirsute; urgency=medium

  * Disable building with LTO to fix segfault on startup (LP: #1923053)

 -- Rik Mills <email address hidden> Thu, 22 Apr 2021 15:21:37 +0100

I am confused by the current state on hirsute. #45 seems to indicate that this should have been transitioned to Released on 4/28, yet the status still indicates committed. I am trying to track this to update my machine. Any help would be appreciated.

On 04/05/2021 12:33, Jonathan Rice wrote:
> I am confused by the current state on hirsute. #45 seems to indicate
> that this should have been transitioned to Released on 4/28, yet the
> status still indicates committed. I am trying to track this to update
> my machine. Any help would be appreciated.

#45 is a result of this being fixed in impish, as a result of the
hirsute update being copied to impish. (hence hirsute in the changelog)

So yes, the hirsute update is not released yet.

This bug was fixed in the package nextcloud-desktop - 3.1.1-1ubuntu1.1

---------------
nextcloud-desktop (3.1.1-1ubuntu1.1) hirsute; urgency=medium

  * Disable building with LTO to fix segfault on startup (LP: #1923053)

 -- Rik Mills <email address hidden> Thu, 22 Apr 2021 15:21:37 +0100

The verification of the Stable Release Update for nextcloud-desktop has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

I'm seeing a similar crash in jammy again with nextcloud-desktop-3.3.5-1:

```
Thread 1 "nextcloud" received signal SIGSEGV, Segmentation fault.
0x00007fffedc9a89e in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) bt
#0 0x00007fffedc9a89e in () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#1 0x00007fffee451f36 in QGuiApplication::screenAdded(QScreen*) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#2 0x00007fffee437740 in QWindowSystemInterface::handleScreenAdded(QPlatformScreen*, bool) ()
    at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#3 0x00007fffe2b6b348 in QXcbConnection::initializeScreens() () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4 0x00007fffe2b425e0 in QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, unsigned int, char const*) ()
    at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#5 0x00007fffe2b45d10 in QXcbIntegration::QXcbIntegration(QStringList const&, int&, char**) ()
    at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
```