Description of problem: got the following messages logged to the kernel log during shutdown: 08:14:36,071 WARNING kernel:[ 1147.692322] 08:14:36,071 WARNING kernel:[ 1147.692323] ====================================================== 08:14:36,071 WARNING kernel:[ 1147.692324] [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ] 08:14:36,071 WARNING kernel:[ 1147.692325] 4.3.0-0.rc4.git3.1.fc24.x86_64 #1 Not tainted 08:14:36,071 WARNING kernel:[ 1147.692325] ------------------------------------------------------ 08:14:36,071 WARNING kernel:[ 1147.692326] systemd-udevd/15083 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: 08:14:36,071 WARNING kernel:[ 1147.692331] (policy_rwlock){.+.+..}, at: [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,071 WARNING kernel:[ 1147.692332] 08:14:36,071 WARNING kernel:[ 1147.692332] and this task is already holding: 08:14:36,071 WARNING kernel:[ 1147.692334] (&(&sighand->siglock)->rlock){-.-.-.}, at: [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,071 WARNING kernel:[ 1147.692335] which would create a new lock dependency: 08:14:36,071 WARNING kernel:[ 1147.692336] (&(&sighand->siglock)->rlock){-.-.-.} -> (policy_rwlock){.+.+..} 08:14:36,071 WARNING kernel:[ 1147.692336] 08:14:36,071 WARNING kernel:[ 1147.692336] but this new dependency connects a HARDIRQ-irq-safe lock: 08:14:36,071 WARNING kernel:[ 1147.692337] (&(&sighand->siglock)->rlock){-.-.-.} 08:14:36,071 WARNING kernel:[ 1147.692337] ... which became HARDIRQ-irq-safe at: 08:14:36,071 WARNING kernel:[ 1147.692339] [<ffffffff81105e1e>] __lock_acquire+0xa7e/0x1ba0 08:14:36,071 WARNING kernel:[ 1147.692340] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,071 WARNING kernel:[ 1147.692343] [<ffffffff8186149d>] _raw_spin_lock+0x3d/0x80 08:14:36,071 WARNING kernel:[ 1147.692344] [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,071 WARNING kernel:[ 1147.692345] [<ffffffff810ba5eb>] do_send_sig_info+0x3b/0xa0 08:14:36,071 WARNING kernel:[ 1147.692346] [<ffffffff810badf6>] group_send_sig_info+0xb6/0x130 08:14:36,075 WARNING kernel:[ 1147.692347] [<ffffffff810bafe3>] kill_pid_info+0x83/0x160 08:14:36,075 WARNING kernel:[ 1147.692349] [<ffffffff81132960>] it_real_fn+0x50/0x110 08:14:36,075 WARNING kernel:[ 1147.692351] [<ffffffff81131190>] __hrtimer_run_queues+0x130/0x4b0 08:14:36,075 WARNING kernel:[ 1147.692352] [<ffffffff81131bd7>] hrtimer_interrupt+0xb7/0x1d0 08:14:36,075 WARNING kernel:[ 1147.692353] [<ffffffff81057178>] local_apic_timer_interrupt+0x38/0x60 08:14:36,075 WARNING kernel:[ 1147.692355] [<ffffffff8186560d>] smp_apic_timer_interrupt+0x3d/0x50 08:14:36,075 WARNING kernel:[ 1147.692356] [<ffffffff818631dc>] apic_timer_interrupt+0x8c/0xa0 08:14:36,075 WARNING kernel:[ 1147.692358] [<ffffffff81026a63>] default_idle+0x23/0x150 08:14:36,075 WARNING kernel:[ 1147.692359] [<ffffffff8102738f>] arch_cpu_idle+0xf/0x20 08:14:36,075 WARNING kernel:[ 1147.692361] [<ffffffff810f933a>] default_idle_call+0x2a/0x40 08:14:36,075 WARNING kernel:[ 1147.692362] [<ffffffff810f9734>] cpu_startup_entry+0x384/0x3f0 08:14:36,075 WARNING kernel:[ 1147.692364] [<ffffffff8185304a>] rest_init+0x13a/0x140 08:14:36,075 WARNING kernel:[ 1147.692366] [<ffffffff82194052>] start_kernel+0x4cc/0x4ed 08:14:36,075 WARNING kernel:[ 1147.692367] [<ffffffff82193339>] x86_64_start_reservations+0x2a/0x2c 08:14:36,077 WARNING kernel:[ 1147.692369] [<ffffffff82193485>] x86_64_start_kernel+0x14a/0x16d 08:14:36,077 WARNING kernel:[ 1147.692369] 08:14:36,077 WARNING kernel:[ 1147.692369] to a HARDIRQ-irq-unsafe lock: 08:14:36,077 WARNING kernel:[ 1147.692370] (&(&list->lock)->rlock){+.-...} 08:14:36,077 WARNING kernel:[ 1147.692370] ... which became HARDIRQ-irq-unsafe at: 08:14:36,077 WARNING kernel:[ 1147.692371] ... [<ffffffff81105cb2>] __lock_acquire+0x912/0x1ba0 08:14:36,077 WARNING kernel:[ 1147.692372] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,077 WARNING kernel:[ 1147.692373] [<ffffffff818616a5>] _raw_spin_lock_bh+0x45/0x80 08:14:36,077 WARNING kernel:[ 1147.692374] [<ffffffff8175441c>] netlink_poll+0x8c/0x1c0 08:14:36,077 WARNING kernel:[ 1147.692377] [<ffffffff816f9995>] sock_poll+0x185/0x1f0 08:14:36,077 WARNING kernel:[ 1147.692378] [<ffffffff812bf6d0>] SyS_epoll_ctl+0x760/0xd00 08:14:36,077 WARNING kernel:[ 1147.692380] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,077 WARNING kernel:[ 1147.692380] 08:14:36,077 WARNING kernel:[ 1147.692380] other info that might help us debug this: 08:14:36,077 WARNING kernel:[ 1147.692380] 08:14:36,077 WARNING kernel:[ 1147.692381] Chain exists of: 08:14:36,077 WARNING kernel:[ 1147.692381] &(&sighand->siglock)->rlock --> policy_rwlock --> &(&list->lock)->rlock 08:14:36,077 WARNING kernel:[ 1147.692381] 08:14:36,077 WARNING kernel:[ 1147.692381] Possible interrupt unsafe locking scenario: 08:14:36,077 WARNING kernel:[ 1147.692381] 08:14:36,077 WARNING kernel:[ 1147.692382] CPU0 CPU1 08:14:36,077 WARNING kernel:[ 1147.692382] ---- ---- 08:14:36,077 WARNING kernel:[ 1147.692382] lock(&(&list->lock)->rlock); 08:14:36,077 WARNING kernel:[ 1147.692383] local_irq_disable(); 08:14:36,077 WARNING kernel:[ 1147.692383] lock(&(&sighand->siglock)->rlock); 08:14:36,077 WARNING kernel:[ 1147.692384] lock(policy_rwlock); 08:14:36,077 WARNING kernel:[ 1147.692384] <Interrupt> 08:14:36,077 WARNING kernel:[ 1147.692384] lock(&(&sighand->siglock)->rlock); 08:14:36,077 WARNING kernel:[ 1147.692384] 08:14:36,077 WARNING kernel:[ 1147.692384] *** DEADLOCK *** 08:14:36,077 WARNING kernel:[ 1147.692384] 08:14:36,077 WARNING kernel:[ 1147.692385] 4 locks held by systemd-udevd/15083: 08:14:36,077 WARNING kernel:[ 1147.692388] #0: (sb_writers#3){.+.+.+}, at: [<ffffffff81270389>] __sb_start_write+0xc9/0x110 08:14:36,077 WARNING kernel:[ 1147.692391] #1: (&(&p->alloc_lock)->rlock){+.+.-.}, at: [<ffffffff812e7b7e>] oom_score_adj_write+0x10e/0x2d0 08:14:36,077 WARNING kernel:[ 1147.692392] #2: (&(&sighand->siglock)->rlock){-.-.-.}, at: [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,079 WARNING kernel:[ 1147.692395] #3: (rcu_read_lock){......}, at: [<ffffffff810b4705>] has_ns_capability_noaudit+0x5/0x160 08:14:36,079 WARNING kernel:[ 1147.692395] 08:14:36,079 WARNING kernel:[ 1147.692395] the dependencies between HARDIRQ-irq-safe lock and the holding lock: 08:14:36,079 WARNING kernel:[ 1147.692402] -> (&(&sighand->siglock)->rlock){-.-.-.} ops: 2626327 { 08:14:36,079 WARNING kernel:[ 1147.692403] IN-HARDIRQ-W at: 08:14:36,079 WARNING kernel:[ 1147.692404] [<ffffffff81105e1e>] __lock_acquire+0xa7e/0x1ba0 08:14:36,079 WARNING kernel:[ 1147.692404] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,079 WARNING kernel:[ 1147.692406] [<ffffffff8186149d>] _raw_spin_lock+0x3d/0x80 08:14:36,079 WARNING kernel:[ 1147.692407] [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,079 WARNING kernel:[ 1147.692407] [<ffffffff810ba5eb>] do_send_sig_info+0x3b/0xa0 08:14:36,079 WARNING kernel:[ 1147.692408] [<ffffffff810badf6>] group_send_sig_info+0xb6/0x130 08:14:36,079 WARNING kernel:[ 1147.692409] [<ffffffff810bafe3>] kill_pid_info+0x83/0x160 08:14:36,079 WARNING kernel:[ 1147.692410] [<ffffffff81132960>] it_real_fn+0x50/0x110 08:14:36,079 WARNING kernel:[ 1147.692411] [<ffffffff81131190>] __hrtimer_run_queues+0x130/0x4b0 08:14:36,079 WARNING kernel:[ 1147.692412] [<ffffffff81131bd7>] hrtimer_interrupt+0xb7/0x1d0 08:14:36,079 WARNING kernel:[ 1147.692413] [<ffffffff81057178>] local_apic_timer_interrupt+0x38/0x60 08:14:36,079 WARNING kernel:[ 1147.692414] [<ffffffff8186560d>] smp_apic_timer_interrupt+0x3d/0x50 08:14:36,079 WARNING kernel:[ 1147.692415] [<ffffffff818631dc>] apic_timer_interrupt+0x8c/0xa0 08:14:36,079 WARNING kernel:[ 1147.692416] [<ffffffff81026a63>] default_idle+0x23/0x150 08:14:36,079 WARNING kernel:[ 1147.692417] [<ffffffff8102738f>] arch_cpu_idle+0xf/0x20 08:14:36,079 WARNING kernel:[ 1147.692418] [<ffffffff810f933a>] default_idle_call+0x2a/0x40 08:14:36,079 WARNING kernel:[ 1147.692419] [<ffffffff810f9734>] cpu_startup_entry+0x384/0x3f0 08:14:36,079 WARNING kernel:[ 1147.692421] [<ffffffff8185304a>] rest_init+0x13a/0x140 08:14:36,079 WARNING kernel:[ 1147.692422] [<ffffffff82194052>] start_kernel+0x4cc/0x4ed 08:14:36,079 WARNING kernel:[ 1147.692423] [<ffffffff82193339>] x86_64_start_reservations+0x2a/0x2c 08:14:36,079 WARNING kernel:[ 1147.692424] [<ffffffff82193485>] x86_64_start_kernel+0x14a/0x16d 08:14:36,079 WARNING kernel:[ 1147.692425] IN-SOFTIRQ-W at: 08:14:36,079 WARNING kernel:[ 1147.692426] [<ffffffff81105c91>] __lock_acquire+0x8f1/0x1ba0 08:14:36,079 WARNING kernel:[ 1147.692427] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,079 WARNING kernel:[ 1147.692428] [<ffffffff8186149d>] _raw_spin_lock+0x3d/0x80 08:14:36,079 WARNING kernel:[ 1147.692429] [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,080 WARNING kernel:[ 1147.692430] [<ffffffff810ba5eb>] do_send_sig_info+0x3b/0xa0 08:14:36,080 WARNING kernel:[ 1147.692430] [<ffffffff810badf6>] group_send_sig_info+0xb6/0x130 08:14:36,080 WARNING kernel:[ 1147.692431] [<ffffffff810bafe3>] kill_pid_info+0x83/0x160 08:14:36,080 WARNING kernel:[ 1147.692432] [<ffffffff81132960>] it_real_fn+0x50/0x110 08:14:36,080 WARNING kernel:[ 1147.692433] [<ffffffff81131190>] __hrtimer_run_queues+0x130/0x4b0 08:14:36,080 WARNING kernel:[ 1147.692434] [<ffffffff81131bd7>] hrtimer_interrupt+0xb7/0x1d0 08:14:36,080 WARNING kernel:[ 1147.692435] [<ffffffff81057178>] local_apic_timer_interrupt+0x38/0x60 08:14:36,080 WARNING kernel:[ 1147.692436] [<ffffffff8186560d>] smp_apic_timer_interrupt+0x3d/0x50 08:14:36,080 WARNING kernel:[ 1147.692437] [<ffffffff818631dc>] apic_timer_interrupt+0x8c/0xa0 08:14:36,080 WARNING kernel:[ 1147.692438] [<ffffffff810b0202>] irq_exit+0x112/0x120 08:14:36,080 WARNING kernel:[ 1147.692439] [<ffffffff8186551a>] do_IRQ+0x6a/0x120 08:14:36,080 WARNING kernel:[ 1147.692440] [<ffffffff81862e4c>] ret_from_intr+0x0/0x31 08:14:36,080 WARNING kernel:[ 1147.692442] [<ffffffff8121c072>] vma_adjust+0x2b2/0x820 08:14:36,085 WARNING kernel:[ 1147.692443] [<ffffffff8121c6fc>] __split_vma.isra.33+0x11c/0x1d0 08:14:36,085 WARNING kernel:[ 1147.692444] [<ffffffff8121d73d>] do_munmap+0xfd/0x460 08:14:36,085 WARNING kernel:[ 1147.692445] [<ffffffff8121dae4>] vm_munmap+0x44/0x60 08:14:36,085 WARNING kernel:[ 1147.692448] [<ffffffff812d0def>] elf_map+0xdf/0xf0 08:14:36,085 WARNING kernel:[ 1147.692449] [<ffffffff812d2308>] load_elf_binary+0x1448/0x1760 08:14:36,085 WARNING kernel:[ 1147.692450] [<ffffffff81273927>] search_binary_handler+0x97/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692452] [<ffffffff81275385>] do_execveat_common.isra.31+0x6a5/0x960 08:14:36,085 WARNING kernel:[ 1147.692453] [<ffffffff8127592a>] SyS_execve+0x3a/0x50 08:14:36,085 WARNING kernel:[ 1147.692454] [<ffffffff81862625>] return_from_execve+0x0/0x23 08:14:36,085 WARNING kernel:[ 1147.692465] IN-RECLAIM_FS-W at: 08:14:36,085 WARNING kernel:[ 1147.692467] [<ffffffff81105cff>] __lock_acquire+0x95f/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692467] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692469] [<ffffffff8186149d>] _raw_spin_lock+0x3d/0x80 08:14:36,085 WARNING kernel:[ 1147.692470] [<ffffffff810ba39a>] __lock_task_sighand+0xaa/0x2c0 08:14:36,085 WARNING kernel:[ 1147.692471] [<ffffffff810ba5eb>] do_send_sig_info+0x3b/0xa0 08:14:36,085 WARNING kernel:[ 1147.692472] [<ffffffff810badf6>] group_send_sig_info+0xb6/0x130 08:14:36,085 WARNING kernel:[ 1147.692472] [<ffffffff810bafe3>] kill_pid_info+0x83/0x160 08:14:36,085 WARNING kernel:[ 1147.692473] [<ffffffff81132960>] it_real_fn+0x50/0x110 08:14:36,085 WARNING kernel:[ 1147.692474] [<ffffffff81131190>] __hrtimer_run_queues+0x130/0x4b0 08:14:36,085 WARNING kernel:[ 1147.692475] [<ffffffff81131bd7>] hrtimer_interrupt+0xb7/0x1d0 08:14:36,085 WARNING kernel:[ 1147.692476] [<ffffffff81057178>] local_apic_timer_interrupt+0x38/0x60 08:14:36,085 WARNING kernel:[ 1147.692478] [<ffffffff8186560d>] smp_apic_timer_interrupt+0x3d/0x50 08:14:36,085 WARNING kernel:[ 1147.692478] [<ffffffff818631dc>] apic_timer_interrupt+0x8c/0xa0 08:14:36,085 WARNING kernel:[ 1147.692480] [<ffffffff811f4a4c>] __remove_mapping+0xdc/0x1d0 08:14:36,085 WARNING kernel:[ 1147.692481] [<ffffffff811f788c>] shrink_page_list+0x69c/0x8d0 08:14:36,085 WARNING kernel:[ 1147.692482] [<ffffffff811f819e>] shrink_inactive_list+0x26e/0x600 08:14:36,085 WARNING kernel:[ 1147.692483] [<ffffffff811f8e2e>] shrink_lruvec+0x55e/0x740 08:14:36,085 WARNING kernel:[ 1147.692484] [<ffffffff811f90be>] shrink_zone+0xae/0x2c0 08:14:36,085 WARNING kernel:[ 1147.692485] [<ffffffff811fa7b1>] kswapd+0x571/0xb10 08:14:36,085 WARNING kernel:[ 1147.692488] [<ffffffff810cf981>] kthread+0x101/0x120 08:14:36,085 WARNING kernel:[ 1147.692488] [<ffffffff818626ef>] ret_from_fork+0x3f/0x70 08:14:36,085 WARNING kernel:[ 1147.692489] INITIAL USE at: 08:14:36,085 WARNING kernel:[ 1147.692490] [<ffffffff8110594d>] __lock_acquire+0x5ad/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692491] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692492] [<ffffffff818620b6>] _raw_spin_lock_irqsave+0x56/0x90 08:14:36,085 WARNING kernel:[ 1147.692493] [<ffffffff810b8412>] flush_signals+0x22/0x70 08:14:36,085 WARNING kernel:[ 1147.692494] [<ffffffff810b84fe>] ignore_signals+0x2e/0x30 08:14:36,085 WARNING kernel:[ 1147.692496] [<ffffffff810d047a>] kthreadd+0x4a/0x390 08:14:36,085 WARNING kernel:[ 1147.692496] [<ffffffff818626ef>] ret_from_fork+0x3f/0x70 08:14:36,085 WARNING kernel:[ 1147.692496] } 08:14:36,085 WARNING kernel:[ 1147.692499] ... key at: [<ffffffff82421ff8>] __key.54668+0x0/0x8 08:14:36,085 WARNING kernel:[ 1147.692499] ... acquired at: 08:14:36,085 WARNING kernel:[ 1147.692500] [<ffffffff8110443b>] check_irq_usage+0x4b/0xb0 08:14:36,085 WARNING kernel:[ 1147.692501] [<ffffffff8110693d>] __lock_acquire+0x159d/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692502] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692503] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692504] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692506] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692508] [<ffffffff81394c24>] avc_has_perm_noaudit+0x104/0x230 08:14:36,085 WARNING kernel:[ 1147.692509] [<ffffffff81398bbe>] cred_has_capability+0x6e/0x110 08:14:36,085 WARNING kernel:[ 1147.692509] [<ffffffff81398cb2>] selinux_capable+0x12/0x20 08:14:36,085 WARNING kernel:[ 1147.692510] [<ffffffff8138fde5>] security_capable_noaudit+0x45/0x60 08:14:36,085 WARNING kernel:[ 1147.692512] [<ffffffff810b4782>] has_ns_capability_noaudit+0x82/0x160 08:14:36,085 WARNING kernel:[ 1147.692513] [<ffffffff810b4877>] has_capability_noaudit+0x17/0x20 08:14:36,085 WARNING kernel:[ 1147.692514] [<ffffffff812e7bed>] oom_score_adj_write+0x17d/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692516] [<ffffffff8126ca97>] __vfs_write+0x37/0x100 08:14:36,085 WARNING kernel:[ 1147.692518] [<ffffffff8126d469>] vfs_write+0xa9/0x1a0 08:14:36,085 WARNING kernel:[ 1147.692519] [<ffffffff8126e168>] SyS_write+0x58/0xd0 08:14:36,085 WARNING kernel:[ 1147.692520] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692520] 08:14:36,085 WARNING kernel:[ 1147.692521] 08:14:36,085 WARNING kernel:[ 1147.692521] the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: 08:14:36,085 WARNING kernel:[ 1147.692526] -> (&(&list->lock)->rlock){+.-...} ops: 610237 { 08:14:36,085 WARNING kernel:[ 1147.692526] HARDIRQ-ON-W at: 08:14:36,085 WARNING kernel:[ 1147.692527] [<ffffffff81105cb2>] __lock_acquire+0x912/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692528] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692529] [<ffffffff818616a5>] _raw_spin_lock_bh+0x45/0x80 08:14:36,085 WARNING kernel:[ 1147.692530] [<ffffffff8175441c>] netlink_poll+0x8c/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692531] [<ffffffff816f9995>] sock_poll+0x185/0x1f0 08:14:36,085 WARNING kernel:[ 1147.692532] [<ffffffff812bf6d0>] SyS_epoll_ctl+0x760/0xd00 08:14:36,085 WARNING kernel:[ 1147.692534] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692534] IN-SOFTIRQ-W at: 08:14:36,085 WARNING kernel:[ 1147.692535] [<ffffffff81105c91>] __lock_acquire+0x8f1/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692536] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692537] [<ffffffff818620b6>] _raw_spin_lock_irqsave+0x56/0x90 08:14:36,085 WARNING kernel:[ 1147.692538] [<ffffffff816fee80>] sock_queue_rcv_skb+0xd0/0x300 08:14:36,085 WARNING kernel:[ 1147.692540] [<ffffffff8179ad7f>] __udp_queue_rcv_skb+0x4f/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692541] [<ffffffff8179e05f>] udp_queue_rcv_skb+0x27f/0x4a0 08:14:36,085 WARNING kernel:[ 1147.692542] [<ffffffff8179ec2c>] __udp4_lib_rcv+0x4dc/0x920 08:14:36,085 WARNING kernel:[ 1147.692543] [<ffffffff8179f7aa>] udp_rcv+0x1a/0x20 08:14:36,085 WARNING kernel:[ 1147.692544] [<ffffffff81767469>] ip_local_deliver_finish+0xe9/0x3b0 08:14:36,085 WARNING kernel:[ 1147.692545] [<ffffffff81767955>] ip_local_deliver+0x55/0xd0 08:14:36,085 WARNING kernel:[ 1147.692546] [<ffffffff81766ea4>] ip_rcv_finish+0xb4/0x590 08:14:36,085 WARNING kernel:[ 1147.692547] [<ffffffff81767c72>] ip_rcv+0x2a2/0x3d0 08:14:36,085 WARNING kernel:[ 1147.692548] [<ffffffff81719398>] __netif_receive_skb_core+0x578/0xb70 08:14:36,085 WARNING kernel:[ 1147.692549] [<ffffffff817199a8>] __netif_receive_skb+0x18/0x60 08:14:36,085 WARNING kernel:[ 1147.692550] [<ffffffff81719a7a>] process_backlog+0x8a/0x250 08:14:36,085 WARNING kernel:[ 1147.692551] [<ffffffff8171b52f>] net_rx_action+0x21f/0x400 08:14:36,085 WARNING kernel:[ 1147.692553] [<ffffffff810afc0e>] __do_softirq+0xde/0x490 08:14:36,085 WARNING kernel:[ 1147.692554] [<ffffffff8186430c>] do_softirq_own_stack+0x1c/0x30 08:14:36,085 WARNING kernel:[ 1147.692555] [<ffffffff810aef29>] do_softirq.part.13+0x59/0x60 08:14:36,085 WARNING kernel:[ 1147.692556] [<ffffffff810aefe9>] __local_bh_enable_ip+0xb9/0xc0 08:14:36,085 WARNING kernel:[ 1147.692557] [<ffffffff8176c9b3>] ip_finish_output2+0x233/0x660 08:14:36,085 WARNING kernel:[ 1147.692558] [<ffffffff8176e189>] ip_finish_output+0x1a9/0x310 08:14:36,085 WARNING kernel:[ 1147.692558] [<ffffffff8176e651>] ip_output+0x81/0x130 08:14:36,085 WARNING kernel:[ 1147.692559] [<ffffffff8176c509>] ip_local_out_sk+0x39/0x70 08:14:36,085 WARNING kernel:[ 1147.692560] [<ffffffff8176f046>] ip_send_skb+0x16/0x40 08:14:36,085 WARNING kernel:[ 1147.692561] [<ffffffff8179a7bd>] udp_send_skb+0x9d/0x270 08:14:36,085 WARNING kernel:[ 1147.692562] [<ffffffff8179d009>] udp_sendmsg+0x339/0xd80 08:14:36,085 WARNING kernel:[ 1147.692564] [<ffffffff817ab946>] inet_sendmsg+0x106/0x1d0 08:14:36,085 WARNING kernel:[ 1147.692565] [<ffffffff816f9a38>] sock_sendmsg+0x38/0x50 08:14:36,085 WARNING kernel:[ 1147.692566] [<ffffffff816f9f24>] SYSC_sendto+0x104/0x190 08:14:36,085 WARNING kernel:[ 1147.692567] [<ffffffff816fb1fe>] SyS_sendto+0xe/0x10 08:14:36,085 WARNING kernel:[ 1147.692568] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692568] INITIAL USE at: 08:14:36,085 WARNING kernel:[ 1147.692570] [<ffffffff8110594d>] __lock_acquire+0x5ad/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692570] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692572] [<ffffffff818620b6>] _raw_spin_lock_irqsave+0x56/0x90 08:14:36,085 WARNING kernel:[ 1147.692572] [<ffffffff81702440>] skb_queue_tail+0x20/0x50 08:14:36,085 WARNING kernel:[ 1147.692574] [<ffffffff81752f36>] __netlink_sendskb+0x2f6/0x330 08:14:36,085 WARNING kernel:[ 1147.692574] [<ffffffff81756e23>] netlink_unicast+0x1e3/0x280 08:14:36,085 WARNING kernel:[ 1147.692575] [<ffffffff81757596>] netlink_ack+0xb6/0x130 08:14:36,085 WARNING kernel:[ 1147.692576] [<ffffffff817576a9>] netlink_rcv_skb+0x99/0xc0 08:14:36,085 WARNING kernel:[ 1147.692578] [<ffffffff8172d65a>] rtnetlink_rcv+0x2a/0x40 08:14:36,085 WARNING kernel:[ 1147.692579] [<ffffffff81756dd3>] netlink_unicast+0x193/0x280 08:14:36,085 WARNING kernel:[ 1147.692580] [<ffffffff81757383>] netlink_sendmsg+0x4c3/0x620 08:14:36,085 WARNING kernel:[ 1147.692580] [<ffffffff816f9a38>] sock_sendmsg+0x38/0x50 08:14:36,085 WARNING kernel:[ 1147.692581] [<ffffffff816f9f24>] SYSC_sendto+0x104/0x190 08:14:36,085 WARNING kernel:[ 1147.692582] [<ffffffff816fb1fe>] SyS_sendto+0xe/0x10 08:14:36,085 WARNING kernel:[ 1147.692584] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692584] } 08:14:36,085 WARNING kernel:[ 1147.692586] ... key at: [<ffffffff83454090>] __key.26923+0x0/0x8 08:14:36,085 WARNING kernel:[ 1147.692586] ... acquired at: 08:14:36,085 WARNING kernel:[ 1147.692587] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692588] [<ffffffff818620b6>] _raw_spin_lock_irqsave+0x56/0x90 08:14:36,085 WARNING kernel:[ 1147.692589] [<ffffffff81702440>] skb_queue_tail+0x20/0x50 08:14:36,085 WARNING kernel:[ 1147.692590] [<ffffffff81752f36>] __netlink_sendskb+0x2f6/0x330 08:14:36,085 WARNING kernel:[ 1147.692591] [<ffffffff8175320d>] netlink_broadcast_filtered+0x29d/0x3c0 08:14:36,085 WARNING kernel:[ 1147.692592] [<ffffffff8175334d>] netlink_broadcast+0x1d/0x20 08:14:36,085 WARNING kernel:[ 1147.692593] [<ffffffff8116cfcf>] audit_log_end+0x2bf/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692594] [<ffffffff8116d85a>] audit_log+0x6a/0x90 08:14:36,085 WARNING kernel:[ 1147.692596] [<ffffffff813b004e>] security_set_bools+0xee/0x200 08:14:36,085 WARNING kernel:[ 1147.692597] [<ffffffff813a0c0c>] sel_commit_bools_write+0xec/0x150 08:14:36,085 WARNING kernel:[ 1147.692599] [<ffffffff8126ca97>] __vfs_write+0x37/0x100 08:14:36,085 WARNING kernel:[ 1147.692600] [<ffffffff8126d469>] vfs_write+0xa9/0x1a0 08:14:36,085 WARNING kernel:[ 1147.692600] [<ffffffff8126e168>] SyS_write+0x58/0xd0 08:14:36,085 WARNING kernel:[ 1147.692602] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692602] 08:14:36,085 WARNING kernel:[ 1147.692603] -> (policy_rwlock){.+.+..} ops: 1281179 { 08:14:36,085 WARNING kernel:[ 1147.692603] HARDIRQ-ON-R at: 08:14:36,085 WARNING kernel:[ 1147.692604] [<ffffffff811058dc>] __lock_acquire+0x53c/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692605] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692606] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692607] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692608] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692609] [<ffffffff81394e69>] avc_has_perm+0x119/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692610] [<ffffffff8139ab28>] selinux_sb_kern_mount+0xa8/0xb0 08:14:36,085 WARNING kernel:[ 1147.692611] [<ffffffff81390253>] security_sb_kern_mount+0x43/0x60 08:14:36,085 WARNING kernel:[ 1147.692612] [<ffffffff812714bb>] mount_fs+0x7b/0x170 08:14:36,085 WARNING kernel:[ 1147.692614] [<ffffffff8129148b>] vfs_kern_mount+0x6b/0x150 08:14:36,085 WARNING kernel:[ 1147.692615] [<ffffffff821c97ee>] mnt_init+0x183/0x225 08:14:36,085 WARNING kernel:[ 1147.692617] [<ffffffff821c93dc>] vfs_caches_init+0x68/0xd2 08:14:36,085 WARNING kernel:[ 1147.692618] [<ffffffff82193ffc>] start_kernel+0x476/0x4ed 08:14:36,085 WARNING kernel:[ 1147.692619] [<ffffffff82193339>] x86_64_start_reservations+0x2a/0x2c 08:14:36,085 WARNING kernel:[ 1147.692620] [<ffffffff82193485>] x86_64_start_kernel+0x14a/0x16d 08:14:36,085 WARNING kernel:[ 1147.692621] SOFTIRQ-ON-R at: 08:14:36,085 WARNING kernel:[ 1147.692622] [<ffffffff81105cde>] __lock_acquire+0x93e/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692623] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692624] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692625] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692626] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692627] [<ffffffff81394e69>] avc_has_perm+0x119/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692628] [<ffffffff8139ab28>] selinux_sb_kern_mount+0xa8/0xb0 08:14:36,085 WARNING kernel:[ 1147.692629] [<ffffffff81390253>] security_sb_kern_mount+0x43/0x60 08:14:36,085 WARNING kernel:[ 1147.692629] [<ffffffff812714bb>] mount_fs+0x7b/0x170 08:14:36,085 WARNING kernel:[ 1147.692630] [<ffffffff8129148b>] vfs_kern_mount+0x6b/0x150 08:14:36,085 WARNING kernel:[ 1147.692631] [<ffffffff821c97ee>] mnt_init+0x183/0x225 08:14:36,085 WARNING kernel:[ 1147.692632] [<ffffffff821c93dc>] vfs_caches_init+0x68/0xd2 08:14:36,085 WARNING kernel:[ 1147.692634] [<ffffffff82193ffc>] start_kernel+0x476/0x4ed 08:14:36,085 WARNING kernel:[ 1147.692635] [<ffffffff82193339>] x86_64_start_reservations+0x2a/0x2c 08:14:36,085 WARNING kernel:[ 1147.692636] [<ffffffff82193485>] x86_64_start_kernel+0x14a/0x16d 08:14:36,085 WARNING kernel:[ 1147.692637] INITIAL USE at: 08:14:36,085 WARNING kernel:[ 1147.692637] [<ffffffff8110594d>] __lock_acquire+0x5ad/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692638] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692639] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692640] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692642] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692643] [<ffffffff81394e69>] avc_has_perm+0x119/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692644] [<ffffffff8139ab28>] selinux_sb_kern_mount+0xa8/0xb0 08:14:36,085 WARNING kernel:[ 1147.692644] [<ffffffff81390253>] security_sb_kern_mount+0x43/0x60 08:14:36,085 WARNING kernel:[ 1147.692645] [<ffffffff812714bb>] mount_fs+0x7b/0x170 08:14:36,085 WARNING kernel:[ 1147.692646] [<ffffffff8129148b>] vfs_kern_mount+0x6b/0x150 08:14:36,085 WARNING kernel:[ 1147.692647] [<ffffffff821c97ee>] mnt_init+0x183/0x225 08:14:36,085 WARNING kernel:[ 1147.692648] [<ffffffff821c93dc>] vfs_caches_init+0x68/0xd2 08:14:36,085 WARNING kernel:[ 1147.692649] [<ffffffff82193ffc>] start_kernel+0x476/0x4ed 08:14:36,085 WARNING kernel:[ 1147.692651] [<ffffffff82193339>] x86_64_start_reservations+0x2a/0x2c 08:14:36,085 WARNING kernel:[ 1147.692652] [<ffffffff82193485>] x86_64_start_kernel+0x14a/0x16d 08:14:36,085 WARNING kernel:[ 1147.692652] } 08:14:36,085 WARNING kernel:[ 1147.692654] ... key at: [<ffffffff81eec218>] policy_rwlock+0x18/0x60 08:14:36,085 WARNING kernel:[ 1147.692654] ... acquired at: 08:14:36,085 WARNING kernel:[ 1147.692655] [<ffffffff8110443b>] check_irq_usage+0x4b/0xb0 08:14:36,085 WARNING kernel:[ 1147.692656] [<ffffffff8110693d>] __lock_acquire+0x159d/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692657] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692658] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692659] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692660] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692661] [<ffffffff81394c24>] avc_has_perm_noaudit+0x104/0x230 08:14:36,085 WARNING kernel:[ 1147.692662] [<ffffffff81398bbe>] cred_has_capability+0x6e/0x110 08:14:36,085 WARNING kernel:[ 1147.692662] [<ffffffff81398cb2>] selinux_capable+0x12/0x20 08:14:36,085 WARNING kernel:[ 1147.692663] [<ffffffff8138fde5>] security_capable_noaudit+0x45/0x60 08:14:36,085 WARNING kernel:[ 1147.692665] [<ffffffff810b4782>] has_ns_capability_noaudit+0x82/0x160 08:14:36,085 WARNING kernel:[ 1147.692666] [<ffffffff810b4877>] has_capability_noaudit+0x17/0x20 08:14:36,085 WARNING kernel:[ 1147.692667] [<ffffffff812e7bed>] oom_score_adj_write+0x17d/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692668] [<ffffffff8126ca97>] __vfs_write+0x37/0x100 08:14:36,085 WARNING kernel:[ 1147.692669] [<ffffffff8126d469>] vfs_write+0xa9/0x1a0 08:14:36,085 WARNING kernel:[ 1147.692670] [<ffffffff8126e168>] SyS_write+0x58/0xd0 08:14:36,085 WARNING kernel:[ 1147.692671] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 08:14:36,085 WARNING kernel:[ 1147.692671] 08:14:36,085 WARNING kernel:[ 1147.692671] 08:14:36,085 WARNING kernel:[ 1147.692671] stack backtrace: 08:14:36,085 WARNING kernel:[ 1147.692673] CPU: 0 PID: 15083 Comm: systemd-udevd Not tainted 4.3.0-0.rc4.git3.1.fc24.x86_64 #1 08:14:36,085 WARNING kernel:[ 1147.692673] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.2-20150714_191134- 04/01/2014 08:14:36,085 WARNING kernel:[ 1147.692675] 0000000000000000 000000005d91bacc ffff88006942b8d8 ffffffff814199a9 08:14:36,085 WARNING kernel:[ 1147.692676] ffffffff82b69780 ffff88006942b9f0 ffffffff81104399 0000000000000000 08:14:36,085 WARNING kernel:[ 1147.692677] ffffffff00000000 0000000000000001 000000007cfd85c0 ffff88006942b930 08:14:36,085 WARNING kernel:[ 1147.692677] Call Trace: 08:14:36,085 WARNING kernel:[ 1147.692679] [<ffffffff814199a9>] dump_stack+0x4b/0x72 08:14:36,085 WARNING kernel:[ 1147.692679] [<ffffffff81104399>] check_usage+0x539/0x590 08:14:36,085 WARNING kernel:[ 1147.692681] [<ffffffff81025a39>] ? sched_clock+0x9/0x10 08:14:36,085 WARNING kernel:[ 1147.692683] [<ffffffff810697c5>] ? kvm_clock_read+0x25/0x30 08:14:36,085 WARNING kernel:[ 1147.692684] [<ffffffff8110443b>] check_irq_usage+0x4b/0xb0 08:14:36,085 WARNING kernel:[ 1147.692685] [<ffffffff8110693d>] __lock_acquire+0x159d/0x1ba0 08:14:36,085 WARNING kernel:[ 1147.692685] [<ffffffff810697c5>] ? kvm_clock_read+0x25/0x30 08:14:36,085 WARNING kernel:[ 1147.692686] [<ffffffff81025a39>] ? sched_clock+0x9/0x10 08:14:36,085 WARNING kernel:[ 1147.692688] [<ffffffff810e4202>] ? calc_global_load_tick+0x2/0x90 08:14:36,085 WARNING kernel:[ 1147.692689] [<ffffffff811078be>] lock_acquire+0xce/0x1c0 08:14:36,085 WARNING kernel:[ 1147.692690] [<ffffffff813ae6f4>] ? security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692691] [<ffffffff81861a50>] _raw_read_lock+0x40/0x80 08:14:36,085 WARNING kernel:[ 1147.692692] [<ffffffff813ae6f4>] ? security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692693] [<ffffffff813ae6f4>] security_compute_av+0x34/0x2b0 08:14:36,085 WARNING kernel:[ 1147.692694] [<ffffffff81393fc2>] avc_compute_av+0x82/0x2e0 08:14:36,085 WARNING kernel:[ 1147.692695] [<ffffffff81394c24>] avc_has_perm_noaudit+0x104/0x230 08:14:36,085 WARNING kernel:[ 1147.692696] [<ffffffff81394b52>] ? avc_has_perm_noaudit+0x32/0x230 08:14:36,085 WARNING kernel:[ 1147.692697] [<ffffffff81398bbe>] cred_has_capability+0x6e/0x110 08:14:36,085 WARNING kernel:[ 1147.692698] [<ffffffff81398cb2>] selinux_capable+0x12/0x20 08:14:36,085 WARNING kernel:[ 1147.692699] [<ffffffff8138fde5>] security_capable_noaudit+0x45/0x60 08:14:36,085 WARNING kernel:[ 1147.692700] [<ffffffff810b4782>] has_ns_capability_noaudit+0x82/0x160 08:14:36,085 WARNING kernel:[ 1147.692702] [<ffffffff810b4705>] ? has_ns_capability_noaudit+0x5/0x160 08:14:36,085 WARNING kernel:[ 1147.692703] [<ffffffff810b4877>] has_capability_noaudit+0x17/0x20 08:14:36,085 WARNING kernel:[ 1147.692704] [<ffffffff812e7bed>] oom_score_adj_write+0x17d/0x2d0 08:14:36,085 WARNING kernel:[ 1147.692705] [<ffffffff8126ca97>] __vfs_write+0x37/0x100 08:14:36,085 WARNING kernel:[ 1147.692706] [<ffffffff810fffd5>] ? percpu_down_read+0x75/0xc0 08:14:36,085 WARNING kernel:[ 1147.692707] [<ffffffff81270389>] ? __sb_start_write+0xc9/0x110 08:14:36,085 WARNING kernel:[ 1147.692708] [<ffffffff81270389>] ? __sb_start_write+0xc9/0x110 08:14:36,085 WARNING kernel:[ 1147.692709] [<ffffffff8126d469>] vfs_write+0xa9/0x1a0 08:14:36,085 WARNING kernel:[ 1147.692710] [<ffffffff8128e6f6>] ? __fget_light+0x66/0x90 08:14:36,085 WARNING kernel:[ 1147.692711] [<ffffffff8126e168>] SyS_write+0x58/0xd0 08:14:36,085 WARNING kernel:[ 1147.692712] [<ffffffff81862372>] entry_SYSCALL_64_fastpath+0x12/0x76 Version-Release number of selected component (if applicable): systemd-227-1.fc24.x86_64
if I'm not mistaken the recursive read_lock() of policy_rwlock belong to selinux. Is this triggered if you disable selinux?
Doing some pruning, this bug looks to be years old. Please test on a newer kernel and reopen if the problem still exists.