I am not the OP but I’m seeing what I believe to be the same issue (at least mostly same symptoms). In my case, though, it is the Steam client that is explicitly killed off. I have enclosed the output of the inxi command on my machine (an older 7th gen Intel CPU matched with an RX7600 and 16 Gb of RAM) at the bottom of this reply as requested.
I have never had this issue before it started cropping up a lot these past few days. My own hypothesis is that it is linked to a pacman -Syu update I did (catching up on 2-3 weeks of updates while on holiday). Unlike OP I have only seen it applied to Steam. Any games running under Steam then stutter slightly and CTD. It has struck 4 times while playing two different games (one Proton-based, one native) and once while not in game. Usually I will get in a decent amount of time - anything from half an hour to a couple of hours - before it happens.
I am looking into logging memory use to find out whether or not Steam really is hogging memory or whether the kernel is just overreacting. I have also installed the lts-kernel and attempted to compare results but so far haven’t managed to boot with it (some issue at startup).
Summary
System:
Kernel: 6.14.10-arch1-1 arch: x86_64 bits: 64
Desktop: KDE Plasma v: 6.3.5 Distro: EndeavourOS
Machine:
Type: Desktop Mobo: ASUSTeK model: PRIME Z270-A v: Rev 1.xx
serial: <superuser required> UEFI: American Megatrends v: 0801
date: 01/25/2017
Memory:
System RAM: total: 16 GiB available: 15.55 GiB used: 5.24 GiB (33.7%)
Array-1: capacity: 64 GiB slots: 4 modules: 2 EC: None
Device-1: ChannelA-DIMM1 type: no module installed
Device-2: ChannelA-DIMM2 type: DDR4 size: 8 GiB speed: 3000 MT/s
Device-3: ChannelB-DIMM1 type: no module installed
Device-4: ChannelB-DIMM2 type: DDR4 size: 8 GiB speed: 3000 MT/s
CPU:
Info: quad core model: Intel Core i5-7600K bits: 64 type: MCP cache:
L2: 1024 KiB
Speed (MHz): avg: 4800 min/max: 800/4800 cores: 1: 4800 2: 4800 3: 4800
4: 4800
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 33 [Radeon RX 7600/7600
XT/7600M XT/7600S/7700S / PRO W7600] driver: amdgpu v: kernel
Device-2: Logitech C920 HD Pro Webcam driver: snd-usb-audio,uvcvideo
type: USB
Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
compositor: kwin_wayland driver: X: loaded: modesetting dri: radeonsi
gpu: amdgpu resolution: 1920x1200~60Hz
API: EGL v: 1.5 drivers: kms_swrast,radeonsi,swrast
platforms: gbm,wayland,x11,surfaceless,device
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.1.3-arch1.2
renderer: AMD Radeon RX 7600 (radeonsi navi33 LLVM 19.1.7 DRM 3.61
6.14.10-arch1-1)
API: Vulkan v: 1.4.313 drivers: radv surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: corectrl, lact, radeontop
wl: wayland-info x11: xdpyinfo, xprop, xrandr
Network:
Device-1: Intel Ethernet I219-V driver: e1000e
Device-2: Intel Wireless 7260 driver: iwlwifi
Logical:
Message: No logical block device data found.
Device-1: luks-d8b77bd8-85b4-4530-a1f2-e8bfd0566fca type: LUKS
size: 223.07 GiB Components: p-1: nvme0n1p2
Device-2: luks-ec60364a-b258-430a-8b2a-21998c3d8387 type: LUKS
size: 8.78 GiB Components: p-1: nvme0n1p3
Drives:
Local Storage: total: 12.3 TiB used: 8.22 TiB (66.8%)
Partition:
ID-1: / size: 218.51 GiB used: 114.53 GiB (52.4%) fs: ext4 dev: /dev/dm-0
Swap:
ID-1: swap-1 type: partition size: 8.78 GiB used: 1.16 GiB (13.3%)
dev: /dev/dm-1
Info:
Processes: 294 Uptime: 1h 54m Shell: Bash inxi: 3.3.38