audit: type=1400 audit(1554363001.563:9339): avc: denied { map_create } for pid=2324 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! BUG: workqueue lockup - pool[ 3439.758496] INFO: task kworker/u4:32:32565 blocked for more than 140 seconds. Not tainted 4.9.167+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:32 D 24920 32565 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn ffff8801b18d2f80 0000000000000000 ffff8801db621000 ffff8801d428df00 ffff8801db621018 ffff8801a9337730 ffffffff827ffcae 0000000000000000 000000000000046f 0000000000000002 ffff8801db6218f0 1ffff10035266ed5Call Trace: [<0000000021b4883e>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000c84089cc>] schedule_timeout+0x766/0xe50 kernel/time/timer.c:1771 [<000000006ae27b3e>] do_wait_for_common kernel/sched/completion.c:75 [inline] [<000000006ae27b3e>] __wait_for_common kernel/sched/completion.c:93 [inline] [<000000006ae27b3e>] wait_for_common+0x2c6/0x4d0 kernel/sched/completion.c:101 [<00000000927b346f>] wait_for_completion+0x18/0x20 kernel/sched/completion.c:122 [<00000000b40764a0>] __synchronize_srcu+0x26d/0x3d0 kernel/rcu/srcu.c:448 [<000000009b604247>] synchronize_srcu+0x1f/0x40 kernel/rcu/srcu.c:492 [<00000000c79f359d>] fsnotify_mark_destroy_list+0x110/0x390 fs/notify/mark.c:551 [<00000000edaa3b09>] fsnotify_mark_destroy_workfn+0xe/0x10 fs/notify/mark.c:561 [<000000006f5be364>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114 [<0000000052ae9296>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<00000000b7948bc2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000254af99f>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000cb5395ad>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] (rcu_read_lock){......}, at: [<00000000cb5395ad>] watchdog+0x13c/0xae0 kernel/hung_task.c:239 (tasklist_lock){.+.+..}, at: [<0000000094dae25d>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000042392854>] __fdget_pos+0xa8/0xd0 fs/file.c:781 #0: (&tty->ldisc_sem){++++++}, at: [<00000000a3acbaae>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 (&ldata->atomic_read_lock){+.+.+.}, at: [<00000000d03152a0>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [<00000000d611468b>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 ((addr_chk_work).work){+.+...}, at: [<00000000987cd199>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 (rtnl_mutex){+.+.+.}, at: [<0000000005ba9b65>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 #0: (&sb->s_type->i_mutex_key#8){+.+.+.}, at: [<000000007a63ceea>] inode_lock include/linux/fs.h:768 [inline] (&sb->s_type->i_mutex_key#8){+.+.+.}, at: [<000000007a63ceea>] __sock_release+0x89/0x2c0 net/socket.c:604 #0: (&sb->s_type->i_mutex_key#8){+.+.+.}, at: [<000000007a63ceea>] inode_lock include/linux/fs.h:768 [inline] (&sb->s_type->i_mutex_key#8){+.+.+.}, at: [<000000007a63ceea>] __sock_release+0x89/0x2c0 net/socket.c:604 (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000547e91b1>] exp_funnel_lock kernel/rcu/tree_exp.h:289 [inline] (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000547e91b1>] _synchronize_rcu_expedited+0x3a7/0x850 kernel/rcu/tree_exp.h:569 #0: ("events_unbound"){.+.+.+}, at: [<00000000d611468b>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 ((reaper_work).work){+.+...}, at: [<00000000987cd199>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 #0: ("%s""netns"){.+.+.+}, at: [<00000000d611468b>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 (net_cleanup_work){+.+.+.}, at: [<00000000987cd199>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 (net_mutex){+.+.+.}, at: [<00000000152be8bc>] cleanup_net+0x131/0x8a0 net/core/net_namespace.c:439 (rtnl_mutex){+.+.+.}, at: [<0000000005ba9b65>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 (rcu_preempt_state.exp_mutex){+.+...}, at: [<0000000075ebebf7>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline] (rcu_preempt_state.exp_mutex){+.+...}, at: [<0000000075ebebf7>] _synchronize_rcu_expedited+0x339/0x850 kernel/rcu/tree_exp.h:569 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.167+ #36 ffff8801d98d7cc8 ffffffff81b4f011 0000000000000001 0000000000000000 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00 ffffffff81b5a2cc 0000000000000001 0000000000000000 0000000000000001Call Trace: [<00000000d5c6b238>] __dump_stack lib/dump_stack.c:15 [inline] [<00000000d5c6b238>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000d0c331a7>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000140579b0>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000ef7f5a62>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000003b65e47f>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000003b65e47f>] check_hung_task kernel/hung_task.c:125 [inline] [<000000003b65e47f>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [<000000003b65e47f>] watchdog+0x661/0xae0 kernel/hung_task.c:239 [<00000000b7948bc2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000254af99f>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25446 Comm: kworker/0:5 Not tainted 4.9.167+ #36 Workqueue: events rtc_timer_do_workc task: 00000000186d54ad task.stack: 000000001549cc33 RIP: 0010:[] c [<000000009277bb14>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0018:ffff8801db6077b0 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d6e9d1 RDI: ffffffff84b61a98 RBP: ffff8801db6077c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff841d036a R12: ffffffff84b61a60 R13: 0000000000000020 R14: fffffbfff096c393 R15: fffffbfff096c355 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f421af7b000 CR3: 00000001d39cc000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: ffffffff84b61a60c 000000000000270fc ffff8801db607810c ffffffff81d70c74c 0000000000021000c ffffffff84b61aa8c ffffffff84b61c9ac ffffffff841d0352c ffffffff84b61a60c 0000000000000047c dffffc0000000000c 0000000000000047c Call Trace: d [<0000000047744c87>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] d [<0000000047744c87>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<00000000bcb368aa>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<00000000b6c91cab>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1886 [<00000000850b58ee>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<000000006094f752>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<0000000058dd37e0>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594 [<00000000f4205b07>] console_cont_flush kernel/printk/printk.c:2321 [inline] [<00000000f4205b07>] console_unlock+0x17b/0xb20 kernel/printk/printk.c:2387 [<00000000d9f5ffb3>] vprintk_emit+0x43f/0x6f0 kernel/printk/printk.c:1908 [<00000000071ff712>] vprintk+0x28/0x30 kernel/printk/printk.c:1918 [<000000009497885a>] vprintk_func kernel/printk/internal.h:36 [inline] [<000000009497885a>] printk+0xc2/0xf5 kernel/printk/printk.c:1980 [<00000000b7a9ebbc>] wq_watchdog_timer_fn.cold+0x11/0x66 kernel/workqueue.c:5432 [<00000000e3033f05>] call_timer_fn+0x167/0x6d0 kernel/time/timer.c:1319 [<00000000e2ffe3f2>] expire_timers+0x25b/0x5c0 kernel/time/timer.c:1359 [<000000006e562792>] __run_timers kernel/time/timer.c:1674 [inline] [<000000006e562792>] run_timer_softirq+0x404/0x620 kernel/time/timer.c:1689 [<0000000023be3176>] __do_softirq+0x22d/0x964 kernel/softirq.c:288 [<00000000e93688ca>] invoke_softirq kernel/softirq.c:368 [inline] [<00000000e93688ca>] irq_exit+0x119/0x160 kernel/softirq.c:409 [<0000000085f8b647>] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [<0000000085f8b647>] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:962 [<00000000f5303949>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:648 d [<000000004b7883b1>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] d [<000000004b7883b1>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline] d [<000000004b7883b1>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191 [<00000000522daac2>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [<00000000522daac2>] __wake_up+0x3f/0x50 kernel/sched/wait.c:96 [<000000009b4f0762>] rtc_handle_legacy_irq+0x12c/0x190 drivers/rtc/interface.c:523 [<00000000fc819ba2>] rtc_uie_update_irq+0x20/0x30 drivers/rtc/interface.c:550 [<000000003894ddda>] rtc_timer_do_work+0x1fe/0x600 drivers/rtc/interface.c:881 [<000000006f5be364>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114 [<0000000052ae9296>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<00000000b7948bc2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000254af99f>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Code: c24 cc9 c00 c00 c00 c49 c8d c7c c24 c38 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 cd3 ce3 c80 c3c c02 c00 c75 c17 c41 c03 c5c c24 c38 c89 cda cec c<5b> c0f cb6 cc0 c41 c5c c5d cc3 ce8 c78 c9e c78 cff ceb cc2 ce8 cd1 c9e c78 cff ceb c