Hello, On Sun, Sep 26, 2021 at 10:58:07PM -0400, Waiman Long wrote: > The lockdep splat is caused by the fact that the debug controller use the > "%pK" format specifier to print out address of cset's with css_set_lock > held. Under some circumstances, the use of "%pK" format specifier may > acquire the selinux_ss.policy_rwlock. > > To avoid this possible deadlock scenario, we have to abandon the use of > the "%pK" format specifier and just use "%p" to always hash the cset > addresses. The actual cset addresses aren't that important as long as > they are unique for matching purpose. Isn't the right thing to do here making the selinux rwlock an irqsafe one? It's a bit crazy to have printf specifier to have restrictive locking requirements. Thanks. -- tejun
