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
--
Eyal at Home (e...@eyal.emu.id.au)
