Hi, A new warning has been reported due to swake_up_one_online() use from an offline IRQ: https://lore.kernel.org/oe-lkp/202409231644.4c55582d-lkp@xxxxxxxxx Here is a tentative fix. Similar issue can happen with exp kthread and GP kthread if offline tick fires and there is a pending deferred quiescent state to report on PREEMPT_RCU. Currently only oneshot ticks are disabled while the CPU is offlining. I have yet to take care of the periodic tick implementation. Work in progress... Frederic Weisbecker (3): rcu/nocb: Use switch/case on NOCB timer state machine rcu/nocb: Fix rcuog wake-up from offline softirq rcu: Report callbacks enqueued on offline CPU blind spot kernel/rcu/tree.c | 3 +++ kernel/rcu/tree.h | 1 + kernel/rcu/tree_nocb.h | 47 +++++++++++++++++++++++++++++++----------- 3 files changed, 39 insertions(+), 12 deletions(-) -- 2.46.0
