Hi Naresh,
On Fri, Jul 11, 2025 at 12:11 PM Naresh Kamboju naresh.kamboju@linaro.org wrote:
Regressions on boot failure observed in builds with CONFIG_PREEMPT_RT=y and CONFIG_LAZY_PREEMPT=y enabled on multiple platforms running the Linux next-20250710.
Kernel stalls and RCU preempt self-detected stalls reported. Boot log shows CPU stalls and failure as below.
Test environments:
- Ampere Altra
- rk3399-rock-pi-4b
- x86_64
Regression Analysis:
- New regression? Yes
- Reproducibility? Yes
Boot regression: next-20250710 rcu_preempt self-detected stall on CPU rcu_preempt_deferred_qs_handler
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Thanks for the report. We saw the same issue recently. Here is the fixed commit:
https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git/commit/?h=next...
I have pushed it to rcu next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git/log/?h=next
- Neeraj