Hello, Boqun,
I have run overnight tests on your earlier branches here:
ccb986e8b69f ("MAINTAINERS: Update Joel's email address")
These passed other than a KCSAN complaint involving
rcu_preempt_deferred_qs_handler() and rcu_read_unlock_special().
This looks like the plain C-language writes to ->defer_qs_iw_pending.
My guess is that this is low probability, despite having happened twice,
and that it happens when rcu_read_unlock_special() is interrupted,
resulting in rcu_preempt_deferred_qs_handler() being invoked as an
IRQ-work handler. Keeping in mind that RCU runs KCSAN so as to locate
data races between task and handler on the same CPU.
Thoughts?
Thanx, Paul
