audit: type=1400 audit(2000000170.080:63768): avc: denied { search } for pid=190 comm="udevd" name="/" dev="sysfs" ino=1 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:netcontrol_device_t:s0 tclass=dir permissive=1 audit: type=1400 audit(2000000170.110:63769): avc: denied { search } for pid=28948 comm="udevd" name="/" dev="sysfs" ino=1 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:netcontrol_device_t:s0 tclass=dir permissive=1 INFO: task syz-executor2:1852 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D27112 1852 1 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_timeout+0x710/0xe60 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x3bc/0x4e0 kernel/sched/completion.c:123 __wait_rcu_gp+0x250/0x3a0 kernel/rcu/update.c:413 synchronize_rcu.part.43+0xd2/0xe0 kernel/rcu/tree_plugin.h:764 namespace_unlock+0xef/0x110 fs/namespace.c:1466 do_umount fs/namespace.c:1668 [inline] SYSC_umount fs/namespace.c:1763 [inline] SyS_umount+0x610/0xc90 fs/namespace.c:1732 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a407 RSP: 002b:00007ffd8cfc5b88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045a407 RDX: 0000000000402f40 RSI: 0000000000000002 RDI: 00007ffd8cfc5c30 RBP: 0000000000000f0d R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffd8cfc6cc0 R13: 0000000000b3c940 R14: 0000000000000000 R15: 0000000000000002 INFO: task syz-executor1:19487 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D26680 19487 1869 0x80000002 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 _rcu_barrier+0x5b/0x3f0 kernel/rcu/tree.c:3538 netdev_run_todo+0x112/0x750 net/core/dev.c:7893 tun_detach drivers/net/tun.c:587 [inline] tun_chr_close+0x45/0x50 drivers/net/tun.c:2661 __fput+0x25e/0x6f0 fs/file_table.c:210 task_work_run+0x116/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x8fb/0x28c0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4579b9 RSP: 002b:00007f2c01918c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000129 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004579b9 RDX: 0000000000000016 RSI: 0000000000000947 RDI: 0000000000000947 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 00007f2c019196d4 R13: 00000000004c456d R14: 00000000004d7a40 R15: 00000000ffffffff INFO: task kworker/u4:13:32739 blocked for more than 140 seconds. Not tainted 4.14.90+ #29 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:13 D26552 32739 2 0x80000000 Workqueue: netns cleanup_net Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_timeout+0x710/0xe60 kernel/time/timer.c:1721 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x3bc/0x4e0 kernel/sched/completion.c:123 _rcu_barrier+0x27b/0x3f0 kernel/rcu/tree.c:3603 netdev_run_todo+0x112/0x750 net/core/dev.c:7893 sit_exit_net+0x42f/0x600 net/ipv6/sit.c:1869 ops_exit_list.isra.3+0xa8/0x150 net/core/net_namespace.c:142 cleanup_net+0x3e9/0x880 net/core/net_namespace.c:483 process_one_work+0x86e/0x1670 kernel/workqueue.c:2114 worker_thread+0xdc/0x1000 kernel/workqueue.c:2248 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1758: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:2/2837: #0: ("events"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&map->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 #2: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x5b/0x3f0 kernel/rcu/tree.c:3538 1 lock held by syz-executor1/19075: #0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [] inode_lock include/linux/fs.h:715 [inline] #0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [] __sock_release+0x84/0x250 net/socket.c:601 1 lock held by syz-executor1/19487: #0: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x5b/0x3f0 kernel/rcu/tree.c:3538 4 locks held by kworker/u4:13/32739: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x14c/0x880 net/core/net_namespace.c:449 #3: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x5b/0x3f0 kernel/rcu/tree.c:3538 2 locks held by kworker/0:4/2348: #0: ("events"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&ns->proc_work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 2 locks held by kworker/0:5/2520: #0: ("events"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: (key_gc_work){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 3 locks held by kworker/0:6/2521: #0: ("events"){+.+.}, at: [] process_one_work+0x784/0x1670 kernel/workqueue.c:2085 #1: ((&map->work)){+.+.}, at: [] process_one_work+0x7bc/0x1670 kernel/workqueue.c:2089 #2: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x5b/0x3f0 kernel/rcu/tree.c:3538 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.90+ #29 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2413 Comm: syz-executor5 Not tainted 4.14.90+ #29 task: ffff8881987b0000 task.stack: ffff8881c8c20000 RIP: 0010:___bpf_prog_run+0xcf/0x5c70 kernel/bpf/core.c:885 RSP: 0018:ffff8881c8c27a40 EFLAGS: 00000246 RAX: ffffffff9f9a46c7 RBX: dffffc0000000000 RCX: 0000000000040000 RDX: 1ffffffff4292cd1 RSI: ffffc9000c782000 RDI: ffffffffa1496688 RBP: ffff8881c8c27b70 R08: 0000000000000000 R09: 0000000000000000 R10: 1ffff11039184f6f R11: 0000000000000001 R12: ffffffffa1496560 R13: 1ffff11039184f4f R14: ffffed1039184f74 R15: ffffc900002ea038 FS: 00007f26fbae4700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000240c000 CR3: 00000001d6728004 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: Code: 7f 08 84 c0 0f 85 a0 3e 00 00 41 0f b6 07 48 8d 3c c5 60 65 49 a1 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 71 3e 00 00 49 8b 04 c4 ec 09 86 01 e8 e7 c2 f6 ff 48 c7 c6 e0 64 49 a1 48 c7 c7 20