FYI, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.30a commit 76eb91cccf15105623630fb8866c54bdec56c30c ("rcu: Make cond_resched_rcu_qs() apply to normal RCU flavors") The following kernel message is in 76eb91cccf but not in 7921deecbb. [ 120.535109] rcu-torture: Free-Block Circulation: 6973 6973 6972 6971 6970 6969 6968 6967 6966 6965 0 [ 145.366041] . timed out! +------------------------------------------------+------------+------------+ | | 7921deecbb | 76eb91cccf | +------------------------------------------------+------------+------------+ | boot_successes | 10 | 10 | | boot_failures | 54 | 54 | | IP-Config:Auto-configuration_of_network_failed | 54 | 54 | +------------------------------------------------+------------+------------+ [ 120.534371] rcu-torture: Reader Batch: 39116224 363805 0 0 0 0 0 0 0 0 0 [ 120.535109] rcu-torture: Free-Block Circulation: 6973 6973 6972 6971 6970 6969 6968 6967 6966 6965 0 [ 145.366041] . timed out! [ 175.374379] IP-Config: Auto-configuration of network failed [ 175.374947] geneve: Geneve driver [ 175.376034] debug: unmapping init [mem 0xc5070000-0xc5125fff] [ 175.384649] mount (142) used greatest stack depth: 6776 bytes left Thanks, Huang, Ying