Describe the bug

Somewhere between kernels 6.12.34 and 6.12.44, a problem was introduced in PREEMPT_RT builds.

Both Bookworm and Trixie exhibit the symptom:

6.12.44: Chromium, after visiting several web sites, totally crashes up-to-date RPiOS running on a Raspberry Pi 5.

6.12.34: No problems encountered.

Commits:

6.12.44: eb87a20

6.12.34: 8f77e03

Steps to reproduce the behaviour

Replace 6.12.34 PREEMPT_RT kernel with 6.12.44 PREEMPT_RT kernel.

Visit several web sites with Chromium.

Device (s)

Raspberry Pi 5

System

2025-05-13-raspios-bookworm-arm64.img (updated)

root@raspberrypi:~# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

root@raspberrypi:~# vcgencmd version
2025/08/20 16:21:58
Copyright (c) 2012 Broadcom
version cd866525 (release) (embedded)

root@raspberrypi:~# uname -a
Linux raspberrypi 6.12.44+rpt-rpi-2712 #1 SMP PREEMPT_RT Tue Sep 2 23:01:23 CDT 2025 aarch64 GNU/Linux

Logs

No response

Additional context

No response