On 2022-07-14, Zhouyi Zhou <zhouzhouyi@xxxxxxxxx> wrote: > Thank John for correcting me ;-) After looking more closely, I do not think disabling migration is the correct fix either. The per-cpu variable @wd_timer_tb is written from 2 functions: - watchdog_timer_interrupt() <-- irq handler - arch_touch_nmi_watchdog() <-- called from preemptible Since watchdog_timer_interrupt() is called from irq context, I expect that interrupts need to be disabled for the update in arch_touch_nmi_watchdog(). Perhaps a using a per-cpu local_lock_t with local_lock_irqsave() to protect write access to @wd_timer_tb? John Ogness
