LISA auto/RW-Rr+RW-RC+RW-R+RW-R (* * Result: Sometimes * * Process 0 starts (t=297995). * * P0 advances slightly (t=297996). * * P1 advances slightly (t=297998). * * P2 goes back a bit less than one grace period (t=198999). * * P3 goes back a bit less than one grace period (t=100000). * * Process 0 start at t=297995, process 4 end at t=100000: Cycle allowed. *) { } P0 | P1 | P2 | P3 ; f[rcu_read_lock] | f[rcu_read_lock] | f[rcu_read_lock] | f[rcu_read_lock] ; r[once] r1 x0 | r[once] r1 x1 | r[once] r1 x2 | r[once] r1 x3 ; w[release] x1 1 | mov r4 (eq r1 r4) | w[once] x3 1 | w[once] x0 1 ; f[rcu_read_unlock] | b[] r4 CTRL1 | f[rcu_read_unlock] | f[rcu_read_unlock] ; | w[once] x2 1 | | ; | CTRL1: | | ; | f[rcu_read_unlock] | | ; Observed 3:r1=1; 2:r1=1; 1:r1=1; 0:r1=1;