On Fri, Sep 12, 2014 at 09:12:13AM -0400, r...@redhat.com wrote: > The sig->stats_lock nests inside the tasklist_lock and the > sighand->siglock in __exit_signal and wait_task_zombie. > > However, both of those locks can be taken from irq context, > which means we need to use the interrupt safe variant of > read_seqbegin_or_lock. This blocks interrupts when the "lock" > branch is taken (seq is odd), preventing the lock inversion. > > On the first (lockless) pass through the loop, irqs are not > blocked. > > This fixes the lockdep complaints that Stanislaw reported. >
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