I tried to reduce it while keeping the problem: http://dl.free.fr/mhqZGjeum

I have one video which triggers a warning during proxy generation (with or without this patch)

In D10394#263489, @Richard Antalik (ISS) wrote:

Thanks for testing, you can re-check.

I tried the patch on top of 17dddc941 (by replacing completely indexer.c due to the patch not applying as it is, even with a larger fuzzy factor) on a couple of video files and got SIGSEGV upon proxy build finishing

Based on code style in the same file, factorized the condition to determine whether transform keyframes needs to be updated.

I've created D10116 as advised. I also included the fact that either handle snapping won't change the related strip keyframes.

Adding screenshots exhibiting the issue

You're right, that was it.
I had no clue it could be disabled, nor how I did so.
Thanks a lot!

I've only been using Blender from the official website.
Just now, I tested with the 2.90.1 version (from https://www.blender.org/download/Blender2.90/blender-2.90.1-linux64.tar.xz ) and the problem is still present.
Can I provide more info on how to understand the issue?

For reference, in case someone encounters the same bug and is looking for more info, this crash seems to be linked to this bug in Mesa bugtracker: https://bugs.freedesktop.org/show_bug.cgi?id=108824

I have recently dist-upgraded my debian sid, which was stable for maybe 6 months.