FYI, we noticed the below changes on https://github.com/0day-ci/linux Huw-Davies/CALIPSO-implementation/20151222-201139 commit a9579ae9087244d66ddaff74cba098b5ac8adcdb ("netlabel: Add an address family to domain hash entries.") +------------------------------------------------+------------+------------+ | | f10678775a | a9579ae908 | +------------------------------------------------+------------+------------+ | boot_successes | 6 | 0 | | boot_failures | 2 | 6 | | IP-Config:Auto-configuration_of_network_failed | 2 | | | INFO:suspicious_RCU_usage | 0 | 6 | | invoked_oom-killer:gfp_mask=0x | 0 | 2 | | Mem-Info | 0 | 2 | | Out_of_memory:Kill_process | 0 | 2 | | backtrace:netlbl_unlabel_defconf | 0 | 6 | | backtrace:netlbl_init | 0 | 6 | | backtrace:kernel_init_freeable | 0 | 6 | | backtrace:vfs_writev | 0 | 1 | | backtrace:SyS_writev | 0 | 1 | | backtrace:_do_fork | 0 | 2 | | backtrace:SyS_clone | 0 | 2 | +------------------------------------------------+------------+------------+ [ 2.546680] NetLabel: protocols = UNLABELED CIPSOv4 [ 2.642935] [ 2.643856] =============================== [ 2.651635] [ INFO: suspicious RCU usage. ] [ 2.654141] 4.4.0-rc5-00188-ga9579ae #1 Not tainted [ 2.662762] ------------------------------- [ 2.664310] include/linux/rcupdate.h:560 Illegal context switch in RCU read-side critical section! [ 2.678759] [ 2.678759] other info that might help us debug this: [ 2.678759] [ 2.687442] [ 2.687442] rcu_scheduler_active = 1, debug_locks = 1 [ 2.696644] 2 locks held by swapper/1: [ 2.702382] #0: (rcu_read_lock){......}, at: [] rcu_read_lock+0x0/0x5d [ 2.713742] #1: (netlbl_domhsh_lock){+.+.+.}, at: [] netlbl_domhsh_add+0xd9/0x422 [ 2.728638] [ 2.728638] stack backtrace: [ 2.730645] CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.0-rc5-00188-ga9579ae #1 [ 2.746305] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 2.760205] 00000000 cac9a040 cac9de50 c129ac38 cac9de6c c10692dd c1a1b90f c1a19d56 [ 2.781992] c1a2d29f 00000b2d 00000000 cac9de74 c105c913 cac9de88 c105ca9c fffffff4 [ 2.797978] 00000000 cad9b400 cac9dea8 c105cccb 00000000 00000b2d c1a2d29f fffffff4 [ 2.818735] Call Trace: [ 2.820179] [] dump_stack+0x16/0x18 [ 2.832174] [] lockdep_rcu_suspicious+0xb8/0xc1 [ 2.836847] [] rcu_preempt_sleep_check+0x3e/0x40 [ 2.843993] [] ___might_sleep+0x11/0x182 [ 2.851771] [] __might_sleep+0xbe/0xc6 [ 2.854188] [] cache_alloc_debugcheck_before+0x1b/0x1d [ 2.863749] [] kmem_cache_alloc_trace+0x3a/0xde [ 2.871422] [] netlbl_domhsh_add+0x1be/0x422 [ 2.877953] [] ? kmem_cache_alloc_trace+0xd4/0xde [ 2.880583] [] netlbl_domhsh_add_default+0x8/0xa [ 2.887480] [] netlbl_unlabel_defconf+0x54/0x6f [ 2.898711] [] ? netlbl_netlink_init+0x1c/0x1c [ 2.903090] [] netlbl_init+0x53/0x70 [ 2.908960] [] do_one_initcall+0x100/0x1ac [ 2.910973] [] ? do_early_param+0x73/0x73 [ 2.916939] [] ? kernel_init_freeable+0x159/0x1fb [ 2.924050] [] ? up_write+0x16/0x2a [ 2.931322] [] kernel_init_freeable+0x179/0x1fb [ 2.936724] [] ? kernel_init_freeable+0x179/0x1fb [ 2.943707] [] kernel_init+0x8/0xb5 [ 2.950164] [] ret_from_kernel_thread+0x20/0x40 [ 2.956598] [] ? rest_init+0x10e/0x10e [ 2.965402] NetLabel: unlabeled traffic allowed by default [ 2.974704] HPET: 3 timers in total, 0 timers will be used for per-cpu timer [ 2.985471] clocksource: Switched to clocksource kvm-clock Thanks, Ying Huang