evince crashes the X server

[Eyal Lebedinsky]

On 11/7/25 05:39, Vladimir Dergachev wrote:
> 
> 
> On Thu, 10 Jul 2025, Dave Howorth wrote:
> 
>> On Thu, 10 Jul 2025 09:33:12 -0400 (EDT), Vladimir Dergachev wrote:
>>>
>>> Interesting!
>>>
>>> This suggests your intel driver is rather new and has this bug, as on
>>> my systems (Kubuntu LTS) intel_drv.so does not have references to
>>> imprecise_trapezoid_span_converter. In fact it is so bleeding edge
>>> that Google does not show hits to repository with
>>> "imprecise_trapezoid_span_converter".
>>>
>>> Looks like intel driver contains two bugs: whatever triggers the
>>> assertion, and assertion that when violated exits X-server. It is
>>> likely a drawing code, so it could just draw nothing.
>>>
>>> I would suggest first to check RedHat changelogs to see where the
>>> code came from and whether they backported any patches. It could be
>>> the error occurred during porting. If this is not the case, then
>>> contact intel_drv developers, which I think is Intel - they should
>>> have forums to post a question to.
>>>
>>> best
>>>
>>> Vladimir Dergachev
>>
>> See
>> https://gitlab.freedesktop.org/xorg/driver/xf86-video-intel/-/blob/master/src/sna/sna_trapezoids_imprecise.c
>>
>> for a/the definition of the function. It hasn't been changed in ten
>> years though, so something else must be causing a problem, I think.
>>
> 
> Thanks!
> 
> You are quite right - the assertion is right there on line 2021. The code uses multiple threads just before it, so it might be guarding against memory corruption, which would justify the exit.
> 
> I am really very surprised that Google does not find this code.

I use duckduckgo and it found it. I think it uses bing.

> To Eyal - it might make sense to file a bug with Fedora/Redhat first, and to get things working rollback to an earlier driver.

$ sudo dnf downgrade xorg-x11-drv-intel
The lowest available version of the "xorg-x11-drv-intel.x86_64" package is already installed, cannot downgrade it.

It is early in the life of f42 so the latest is the only version available.

Submitted
	https://bugzilla.redhat.com/show_bug.cgi?id=2379433

> best
> 
> Vladimir Dergachev


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