Webrender: continuous insta-crashes when enabling Webrender.

[Betsy25]

If this is not the correct place to file a bug, feel free to close it.
Using FF nightly with, when setting these prefs...

gfx.webrender.enabled --> true
gfx.webrender.blob-images --> true

... I get continuous insta-crashes upon (re-)starting the browser. Had to revert them from the prefs.js

All crash reports look exactly the same, except for the "Crash Reason", which sometimes is EXCEPTION_ACCESS_VIOLATION_READ or else EXCEPTION_ACCESS_VIOLATION_WRITE

Graphics card : AMD Mobility Radeon HD 5000 Series (with latest released driver for it)

[jrmuizel]

This crash is being tracked here: https://bugzilla.mozilla.org/show_bug.cgi?id=1412848. I can't reproduce it locally, and don't have a theory about why it's crashing.

[jrmuizel]

Can you try this with a fresh profile?

[Betsy25]

Can you try this with a fresh profile?

I started with Extensions disabled, and while the browser window stayed empty for a couple of seconds upon starting, it didn't crash.

[jrmuizel]

Can you narrow down which extension might be related to crash?

[Betsy25]

Can you narrow down which extension might be related to crash?

It seems like it doesn't matter, as long as any extension is enabled.
Only _uBlock Origin_ enabled --> 5sec hang + crash upon start.
Only _Bitwarden - Free Password Manager_ enabled --> 5sec hang + crash upon start.

[jrmuizel]

Weird. I can not reproduce the problem when I install both of those extensions

[Betsy25]

Yes, there are a lot of users in the Nightly thread on Mozillazine forums, who use all kind of extensions, some including the extensions I mentioned, and most of them seem to experience no crashes. One other member who also uses a HD 5000 series graphics card experiences extreme long loading times. (That probably ain't related to my crashing problem)

[jrmuizel]

Do you have any special font settings that you can think of?

[Betsy25]

Nope, nothing different from the default AFAIK.
Screen 1
Screen 2

[Betsy25]

Just chiming in to post my new findings.
Switching only _gfx.webrender.enabled_ to _true_ does NOT crash the browser, but there is a 5-6sec long blank browser window upon start.

It is the _gfx.webrender.blob-images_ entry, when set to _true_ that is insta-crashing the browser.

[jrmuizel]

@Darkspirit figured out that the crash was happening only in 32bit builds. I can reproduce it now so it should be easy to fix.

[jrmuizel]

A fix to this problem has landed. It should make it into tomorrow's Nightly build.

[glennw]

Closing this since it's fixed and tracked in https://bugzilla.mozilla.org/show_bug.cgi?id=1412848.