Segfault on ubuntu 21.04 beta

[fulljackz]

Expected behaviour

Starting nextcloud-client at the boot, from app menu or from command-line.
Starting the client must start synchro check and add an icon on system tray.

Actual behaviour

• At the boot step, nothing.
• When trying to start nextcloud from cli, here is the output :

un@nu:~|⇒  nextcloud
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
[1]    60762 segmentation fault (core dumped)  nextcloud

• Applying warn tip :

un@nu:~|⇒  QT_QPA_PLATFORM=wayland nextcloud
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
[1]    60963 segmentation fault (core dumped)  QT_QPA_PLATFORM=wayland nextcloud

Steps to reproduce

• Following nextcloud ppa informations : https://launchpad.net/~nextcloud-devs/+archive/ubuntu/client

1. sudo add-apt-repository ppa:nextcloud-devs/client
2. sudo apt update
3. sudo apt install nextcloud-desktop

Client configuration

Client version:

Operating system: Ubuntu 21.04 (beta)

OS language: EN

Qt version used by client package (Linux only, see also Settings dialog): N/A

Client package (From Nextcloud or distro) (Linux only): Nextcloud ppa

Installation path of client:

Nextcloud version: 21.0.1

Storage backend (external storage): Directory

Logs

Please use Gist (https://gist.github.com/) or a similar code paster for longer
logs.

1. Client logfile:

Apr 12 15:28:18 kernel: [89954.092779] nextcloud[60963]: segfault at 8 ip 00007fd48a36063f sp 00007ffeebe52ef0 error 4 in libQt5Core.so.5.15.2[7fd48a101000+30b000]
Apr 12 15:28:18 kernel: [89954.092793] Code: 48 89 50 18 48 89 cb eb a5 66 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec a8 00 00 00 48 89 95 70 ff ff ff <4c> 8b 7f 08 64 48 8b 04 25 28 00 00 00 48 89 45 c8 31 c0 41 f6 47

[FlexW]

The QT_QPA_PLATFORM environment variable is probably unrelated to this. Is it possible that you post your core dump after the crash?

[fulljackz]

Yep I can upload a coredump (26M).
Is there a better solution that github to upload binary files ?
I don't really know coredump and debug related files, are there some risks to expose on on the internet ?

Regards,

[FlexW]

Sure. You can upload it here https://cloud.nextcloud.com/s/gF7E326o5fPiXFi

[ShevT]

Kubuntu 21.04 beta (no wayland)
https://gist.github.com/ShevT/580f633fdb98a3cbbc599c7af4f77afb

[fulljackz]

Sure. You can upload it here https://cloud.nextcloud.com/s/gF7E326o5fPiXFi

Done. Compressed.zip is it ok for you ?

[FlexW]

Sure. You can upload it here https://cloud.nextcloud.com/s/gF7E326o5fPiXFi

Done. Compressed.zip is it ok for you ?

Yes, thanks.

[jirislav]

I also have this issue. And I confirm that QT_QPA_PLATFORM is not related as this error message is not shown to me.

Version used: 3.2.0-20210410.072919.14fbf1b10-1.0~hirsute1

OS: Ubuntu Hirsute 21.04
Lang: EN
PPA used: yes

---

Also note that when I run the AppImage, it runs without any problem at all: https://github.com/nextcloud/desktop/releases/tag/v3.2.0-rc3

If you need to run Nextcloud as of right now, run this command for hotfix:

wget https://github.com/nextcloud/desktop/releases/download/v3.2.0-rc3/Nextcloud-3.2.0-rc3.AppImage
chmod +x Nextcloud-3.2.0-rc3.AppImage
sudo mv Nextcloud-3.2.0-rc3.AppImage /usr/bin/nextcloud

[bjo81]

Same here on MATE without wayland.

[FlexW]

I looked into this and can confirm the crash but I'm unsure why it happens. If I compile the client myself, then it runs fine. I would suggest it's a problem with the ppa itself. @ivaradi what do you think?

[bjo81]

The 3.1.1 client from the usual 21.04 repos also crashes, so it seems it's nothing special to the ppa.

[ivaradi]

The build is basically the same for Hirsute and, say, Groovy, except of course that the system libraries and the compiler, etc. are of different versions.

I use the Groovy version on my machine, and it does not crash, so I also think the issue is not specific to the PPA itself, but rather the Hirsute environment.

[jirislav]

My first guess is that the problem is exactly that you can run it on groovy.

You actually should not be able to run it there, but on hirsute itself.

So my thought is:

• what OS distribution is used for the packaging?
• it should be always the same as the target distro
• if package for hirsute is built inside a groovy environment, that'd explain a lot

[matttbe]

Thank you for looking at the issue.

FYI, this issue is also tracked on Launchpad as it also affects the version packaged by the distribution: https://bugs.launchpad.net/ubuntu/+source/nextcloud-desktop/+bug/1923053

If the issue is in QT libs, it is possible to notify people maintaining these libs. Do you know which lib is causing that?

[matttbe]

it should be always the same as the target distro

@jirislav packages available on Launchpad and the "official" ones (distributed with Ubuntu in the official repo) ensure that.
In theory, if libs introduce some modifications that require a rebuild of apps depending on these libs, "official" packages are rebuilt. But here, even these packages have the issue.

[rikmills]

This appears to be due to building with LTO enabled, as per #2790

[drohhyn]

Just to bump the urgency: Ubuntu 21.04 release is today.

[rikmills]

LTO can be disabled by

-export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all optimize=-lto

in debian/rules

[marukuru]

LTO can be disabled by

-export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all optimize=-lto

in debian/rules

Rebuild the PPA package locally with -lto and it works fine.

[jbouter]

I also have this issue. And I confirm that QT_QPA_PLATFORM is not related as this error message is not shown to me.

Version used: 3.2.0-20210410.072919.14fbf1b10-1.0~hirsute1

OS: Ubuntu Hirsute 21.04
Lang: EN
PPA used: yes

Also note that when I run the AppImage, it runs without any problem at all: https://github.com/nextcloud/desktop/releases/tag/v3.2.0-rc3

If you need to run Nextcloud as of right now, run this command for hotfix:

wget https://github.com/nextcloud/desktop/releases/download/v3.2.0-rc3/Nextcloud-3.2.0-rc3.AppImage
chmod +x Nextcloud-3.2.0-rc3.AppImage
sudo mv Nextcloud-3.2.0-rc3.AppImage /usr/bin/nextcloud

The appimage now has a segault for me as well (using Nextcloud-3.2.0-x86_64.AppImage). Ubuntu 21.04 regular. Both wayland and xorg session.

[ivaradi]

Thanks @rikmills and @marukuru, I have disabled the LTO build for Hirsute in the PPA and have rebuilt the 3.2.0 packages. They should work now.

[fulljackz]

I confirm, it works now !
Thanks for your help !

[jbouter]

Can confirm as well - works fine indeed. Thanks @ivaradi !

[FlexW]

@ivaradi are you allowed to close the issue? If yes, please close it if it is resolved, otherwise tell me that it is resolved and then I will close it :)