SIGILL in steamwebhelper's libcef.so after viewing multiple clips

steamopen Distro Family: ArchWeb Component

ValveSoftware/steam-for-linux#12606 · opened 2026-01-01 by javaJake · updated 2026-06-07 · 2 comments · github

JjavaJake 2026-01-01 github

Your system information

Steam client version (build number or date): 1766451605
Distribution (e.g. Ubuntu): CachyOS
Opted into Steam client beta?: No
Have you checked for system updates?: As of 12/29/2025
Steam Logs: steam-logs.tar.gz
GPU: AMD 9070 XT

Please describe your issue in as much detail as possible:

I was viewing multiple clips taken from the background recording feature, and every once in a while the viewer will crash with a SIGILL. The main Steam window remains, but the recording view window will close.

Steps for reproducing this issue:

View multiple clips via the View -> Recordings & Screenshots menu.

Here are the dumps from coredumpctl info /home/jacob/.local/share/Steam/ubuntu12_64/steamwebhelper
all-dumps.txt

Yyari-dog 2026-04-30 github

I am also running into this issue on nix unstable, 6900XT w/ 9900K. currently on xanmod but was also doing it on lqx and zen. I have steam running with -cef-disable-gpu-compositing

Yyari-dog 2026-06-07 github

There's definitely a memory leak involved with this somewhere; each clip bumps the ram use of that swh thread by a few hundred MB, reaches atleast 5GB before it'll crash mostly.

Nothing extracted yet.