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Zarhan
l33t
Joined: 27 Feb 2004
Posts: 996
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 Posted: Sun Jan 05, 2020 11:05 pm Post subject: [WORKAROUND] Any and all QT applications crashing on start |
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I have a very weird issue with my Gentoo box running as a Virtualbox guest after I last upgraded world.
All QT-based applications stopped working. This includes all of KDE, applications such as VLC and Wireshark and so on.
GTK apps (e.g. Gimp, Firefox) work, as do those using Xlib directly (e.g. xclock, xterm).
How should I pursue this? I tried running straces for a few QT apps and frankly, there is no common denominator. They just end with +++ killed by SIGSEGV +++ and nothing before that appears out of the ordinary.
The latest world update pretty much upgraded all of Qt and KDE.
Last edited by Zarhan on Thu Jan 09, 2020 1:24 pm; edited 1 time in total |
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Zarhan
l33t
Joined: 27 Feb 2004
Posts: 996
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| Posted: Sun Jan 05, 2020 11:16 pm Post subject: |
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I can apparently generate a crash with a trivial pyqt example as well, borrowed from https://bugs.gentoo.org/677130
| Code: | import sys
from PyQt5.QtWidgets import QApplication,QLabel
app = QApplication([''])
label = QLabel('Hello World!')
label.show()
sys.exit(app.exec_())
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I get a crash at "label.show()". |
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Zarhan
l33t
Joined: 27 Feb 2004
Posts: 996
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pourpier
Apprentice
Joined: 27 Sep 2017
Posts: 166
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| Posted: Wed Jan 08, 2020 8:16 pm Post subject: |
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You can downgrade to Qt 5.12.5 and recompile all your programs depending on Qt.
Or you can upgrade your version of VirtualBox to at least 5.2.32
Or you can install a Gentoo guest through qemu + kvm + virt-manager.
I installed Gentoo in a VM via qemu and I could compile programs depending on Qt against the version 5.13.2 and all are working so the problem is related to certain version of VirtualBox in combination with Qt 5.13.2 |
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Zarhan
l33t
Joined: 27 Feb 2004
Posts: 996
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| Posted: Thu Jan 09, 2020 8:44 am Post subject: |
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I am running Virtualbox 5.2.34, Windows 10 host, Gentoo guest. vboxvideo driver and guest additions are also working fine.
Anyway, masking qt 5.13 and recompiling everything fixed the issue for me (although that compilation took it's time).
My Gentoo VM has been working for more than two years, it's just that the latest updates to Qt broke everything. Also, emerging Firefox was also affected but disabling AVX2 fixed that one. |
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pourpier
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Joined: 27 Sep 2017
Posts: 166
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| Posted: Thu Jan 09, 2020 9:10 am Post subject: |
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| Zarhan wrote: | I am running Virtualbox 5.2.34, Windows 10 host, Gentoo guest. vboxvideo driver and guest additions are also working fine.
Anyway, masking qt 5.13 and recompiling everything fixed the issue for me (although that compilation took it's time).
My Gentoo VM has been working for more than two years, it's just that the latest updates to Qt broke everything. Also, emerging Firefox was also affected but disabling AVX2 fixed that one. |
This is strange. DasGregor installed Gentoo in a VM with VirtualBox 5.2.32 and he had no issue at all with the programs depending on Qt (I mean the 5.13.2 version).
For Firefox I mentioned it here: https://forums.gentoo.org/viewtopic-t-1092462-highlight-firefox.html
Maybe you could edit the title and put SOLVED in it.
Best regards |
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Zarhan
l33t
Joined: 27 Feb 2004
Posts: 996
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| Posted: Thu Jan 09, 2020 1:24 pm Post subject: |
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| Well, not really solved, although I hope that next QT iteration (5.14?) will not break things and this gets resolved by then. |
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pourpier
Apprentice
Joined: 27 Sep 2017
Posts: 166
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| Posted: Thu Jan 09, 2020 1:47 pm Post subject: |
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| Zarhan wrote: | | Well, not really solved, although I hope that next QT iteration (5.14?) will not break things and this gets resolved by then. |
I've tried other distributions like Artix, Slackware current with Plasma and the Trident Project in VirtualBox and there is no problem at all: neither with Qt 5.13 nor with 5.14
The problem arises when you compile in certain versions of VirtualBox. With qemu I don't have these issues. |
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drizzt
Guru
Joined: 21 Jul 2002
Posts: 428
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| Posted: Fri Jan 10, 2020 8:02 am Post subject: |
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| pourpier wrote: | | Zarhan wrote: | | Well, not really solved, although I hope that next QT iteration (5.14?) will not break things and this gets resolved by then. |
I've tried other distributions like Artix, Slackware current with Plasma and the Trident Project in VirtualBox and there is no problem at all: neither with Qt 5.13 nor with 5.14
The problem arises when you compile in certain versions of VirtualBox. With qemu I don't have these issues. |
Hi,
interesting observation. I can support this assumption since I have 2 physical systems running latest kde with qt-5.14 fine and two virtualbox-6.1 instances crashing. I downgraded virtualbox to 6.0.14 and I am recompiling qt at the moment to see where the problems occur.
greetings
Update:
Tested down to 6.0.10. KDE/qt still crashing
Update2:
Bad news. Downgrading virtualbox to 5.2.34 and recompiling qt and kde didn't solve the problem.
_________________
People don't have to earn my respect. I offer my respect to them, but be careful to lose my respect... |
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xavier10
Guru
Joined: 19 Jan 2004
Posts: 485
Location: Paris, France
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| Posted: Tue Apr 21, 2020 8:03 pm Post subject: |
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I have the same issue, and a virtualbox 6.0.14.
Has anybody found a way to resolve this ? It seems the older version in the current portage tree is a 5.13. |
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asturm
Developer
Joined: 05 Apr 2007
Posts: 8935
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| Posted: Fri May 01, 2020 11:30 am Post subject: |
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Meanwhile it has emerged that building packages inside VirtualBox with -march=native is a problem.
See also: https://bugs.gentoo.org/704392 |
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xavier10
Guru
Joined: 19 Jan 2004
Posts: 485
Location: Paris, France
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| Posted: Tue May 05, 2020 12:23 pm Post subject: |
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| asturm wrote: | Meanwhile it has emerged that building packages inside VirtualBox with -march=native is a problem.
See also: https://bugs.gentoo.org/704392 |
Thanks for your message!
For some reason, I was not getting the notification from the bug entry. For now, I had opted to remove all QT packages (as I found replacements for all of them), but I will try this if I need them again.
Is there much of a performance disadvantage in dropping the march=native compilation option ? |
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