User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Steps to reproduce:

I trigger an action (link click, keyboard shortcut) that leads in a page attempting to open a popup window.

Actual results:

Firefox crashes.

I get this output in a terminal:

ATTENTION: default value of option mesa_glthread overridden by environment.

(firefox:141689): Gdk-ERROR **: 18:46:38.586: The program 'firefox' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
(Details: serial 3405 error_code 9 request_code 154 (DRI2) minor_code 8)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the GDK_SYNCHRONIZE environment
variable to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
ExceptionHandler::GenerateDump cloned child 142002
ExceptionHandler::SendContinueSignalToChild sent continue signal to child
ExceptionHandler::WaitForContinueSignal waiting for continue signal...
Exiting due to channel error.

Expected results:

A popup window should open.

Setting gfx.x11-egl.force-disabled=true solves the issue.

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

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WEBRENDER:
available by default
force_enabled by user: Force enabled by pref
disabled by env: Not qualified

gfx.blacklist.webrender.failureid: FEATURE_FAILURE_DDX_INTEL

Thanks!
Hardware rendering is disabled by default for your setup because you are using the deprecated Intel DDX driver.
That's when $ xrandr --listproviders contains "Intel" instead of the default and recommended "modesetting".
Some users manually choose this driver to use a legacy in-driver compositor to prevent tearing. It's recommended to use a regular X11 compositor instead. If the performance of uncomposited X11 is desired with a compositor, Wayland is recommended.
Please remove deprecated Driver "intel" from your custom Xorg config file and reboot. Does the crash still occur afterwards?

I didn’t even know I was using the intel driver. I didn’t use a custom Xorg config, but I had xserver-xorg-video-intel installed. I removed it and I am on modesetting now. The crash does no longer occur, so it looks like this was the cause.

I guess it would still be preferable not to bring the whole application down in these scenarios?

FWIW, I still have these warnings printed in the terminal:

ATTENTION: default value of option mesa_glthread overridden by environment.
libEGL warning: DRI2: failed to authenticate

But I guess that’s a different issue.

Thanks!

(In reply to frederik.elwert from comment #5)

I guess it would still be preferable not to bring the whole application down in these scenarios?

That's why hardware rendering is blacklisted for this driver.

ATTENTION: default value of option mesa_glthread overridden by environment.

That's because Firefox sets mesa_glthread environment variable for Firefox to its default value (false) to prevent users from setting it to true because it's not supported and would cause a crash.

libEGL warning: DRI2: failed to authenticate

That is likely the actual cause of this crash.
(DRI2 is the older variant and requires authentication. Today, DRI3 is default on X11 and Xwayland.)