FS#71483 : [Xorg] Xorg crashes when opening new window with update 1.20.12-1

FS#71483 - [Xorg] Xorg crashes when opening new window with update 1.20.12-1

Attached to Project: Arch Linux
Opened by Radek Šťasta (Raadush) - Sunday, 11 July 2021, 18:28 GMT
Last edited by Andreas Radke (AndyRTR) - Thursday, 29 July 2021, 19:21 GMT

Task Type	Bug Report
Category	System
Status	Closed
Assigned To	Andreas Radke (AndyRTR) Sven-Hendrik Haase (Svenstaro) Laurent Carlier (lordheavy) Levente Polyak (anthraxx)
Architecture	All
Severity	High
Priority	Normal
Reported Version
Due in Version	Undecided
Due Date	Undecided
Percent Complete
Votes	5 Federico (fedev) (2021-07-24) Lasse Peters (lassepe) (2021-07-20) Robert Donat (RobertDonat) (2021-07-13) Frederic Bezies (fredbezies) (2021-07-12) Radek Šťasta (Raadush) (2021-07-11)
Private	No

Details

Description: After I update Xorg to 1.20.12-1, Xorg crashes. I use Arch Linux with xmonad window manager. See attached journalctl export and Xorg log. I can provide any other additional output if you want it, happens all the time, easily reproducible.

Additional info:
* package version(s)
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
1. Install xorg version 1.20.12-1
2. Open new application window (terminal, browser,...)

journalctl.txt (165.5 KiB)

Xorg.0.log (66 KiB)

This task depends upon

Closed by Andreas Radke (AndyRTR)
Thursday, 29 July 2021, 19:21 GMT
Reason for closing: Fixed

Comment by Andreas Radke (AndyRTR) - Monday, 12 July 2021, 05:23 GMT

If you can confirm this is caused by the Xorg-server update please report this upstream: https://gitlab.freedesktop.org/xorg/xserver/-/issues but the Xorg update can also cause to uncover a bug in xmonad or nvidia driver.

Comment by Radek Šťasta (Raadush) - Monday, 12 July 2021, 05:29 GMT

How do I confirm that? I can see Segmentation fault in Xorg log, and some fatal errors regarding Xorg in journalctl

Comment by Andreas Radke (AndyRTR) - Monday, 12 July 2021, 05:59 GMT

Please downgrade the related Xorg-server packages and check if it keeps to crash with a segfault.

Comment by Sven-Hendrik Haase (Svenstaro) - Monday, 12 July 2021, 06:23 GMT

Also note that regarding the nvidia driver, we can't really do anything about this as it's a binary blob.

Comment by Radek Šťasta (Raadush) - Monday, 12 July 2021, 07:28 GMT

No problem with 1.20.11-1 (all other packages updated to latest version including nvidia), after updating Xorg to 1.20.12-1, it keeps crashing again

Comment by Frederic Bezies (fredbezies) - Monday, 12 July 2021, 08:12 GMT

I can confirm this issue in a Qemu virtual machine with Archlinux and Xfce. With xorg-1.20.12-1, xfce won't load and get back to lightdm. With Xorg-1.20.11-1, I can log in Xfce. Used video driver is QXL one.

While analysing the coredump file, I got an output that I added as an attachment.

GDB backtrace is empty because I do not have a debug enabled version of xorg-server.

coredump.txt (5.4 KiB)

Comment by Radek Šťasta (Raadush) - Monday, 12 July 2021, 08:24 GMT

Comment by Frederic Bezies (fredbezies) - Monday, 12 July 2021, 09:24 GMT

Got a debug stacktrace. Adding it to this comment.

Bug opened on xorg tracker: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1195

stacktrace-2.txt (4.4 KiB)

Comment by Frederic Bezies (fredbezies) - Monday, 12 July 2021, 12:42 GMT

After Philip Muller asked for a git bisect, I was able to find the first broken commit and the last working one on xorg-server 1.20 branch.

https://gitlab.freedesktop.org/xorg/xserver/-/issues/1195#note_988297

```
Last working commit: 4e11bd39 - modesetting: Disable reverse prime offload mode for displays running on evdi,udl
First broken commit: 464cbee1 - modesetting: Initialize present extension despite glamor is disabled
```

It is related to the use of modesetting and Glamor?!

Weird.

Comment by Vasiliki Katsageorgiou (vkatsageorgiou) - Tuesday, 13 July 2021, 11:32 GMT

I also noticed some problem after I updated my system yesterday. I use to work with 2 external monitors connected to my laptop. After I updated my system yesterday, if I have the second monitor connected, it logs out and I try to login it keeps logging me out. If I have only one external monitor connected as duplicate of the laptop screen, it works. I downgraded xorg to 1.20.11 and it seems to be working for now. Though once it happened that I could not enter the password in the login page having both the external monitors connected. I disconnected them and I managed to login without rebooting.

Comment by Vasiliki Katsageorgiou (vkatsageorgiou) - Tuesday, 13 July 2021, 11:43 GMT

Comment by f (bakgwailo) - Thursday, 15 July 2021, 21:42 GMT

I am going to add on to this: finally restarted my laptop today (Optimus, running the official nvidia method), and on reboot SDDM starts up fine, but X/KDE seg faults with a similiar error message. I tried a brand new user and same issue (along with the latest stable kernel and the lts kernel). I switched to plasma-wayland in SDDM and I am able to login in fine. Startx from the CLI also crashes in the same way, so, it does seem like to be a regression in Xorg.

Comment by Frederic Bezies (fredbezies) - Thursday, 29 July 2021, 08:09 GMT

Looks like this bug is now fixed upstream. See this merged pull request: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/715

Related commit: https://gitlab.freedesktop.org/xorg/xserver/-/commit/8836b9d243444031b6396d39d345f2f83b5fa6a9

Comment by Laurent Carlier (lordheavy) - Thursday, 29 July 2021, 08:47 GMT

Please test xorg-server-1.20.12-2

Comment by Frederic Bezies (fredbezies) - Thursday, 29 July 2021, 09:07 GMT

Fixed for me. I can login into a Xfce in a Virtual Machine with this version of xorg-server. No more crashes and going back to lightDM.

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Arch Linux

FS#71483 - [Xorg] Xorg crashes when opening new window with update 1.20.12-1

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