audit: type=1400 audit(1567323458.911:909): avc: denied { create } for pid=12675 comm="syz-executor.1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 BUG: workqueue lockup - pool[ 716.142017] INFO: task kworker/u4:13:6612 blocked for more than 140 seconds. Not tainted 4.9.190+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:13 D 26016 6612 2 0x80000000 Workqueue: netns cleanup_net 0000000000000083 ffff880190345f00 ffff8801d315a100 ffff8801db621000 ffff88019e68af80 ffff8801db621018 ffff8801c75ff640 ffffffff8281a10e ffff8801c75ff590 ffffffff8120cb55 0000000000000292 ffff8801db6218f0Call Trace: [<00000000b5ebb8a7>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000ffe4b0fd>] _synchronize_rcu_expedited+0x593/0x850 kernel/rcu/tree_exp.h:588 [<00000000c762ae92>] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline] [<00000000c762ae92>] synchronize_rcu_expedited+0x22/0x30 kernel/rcu/tree_exp.h:681 [<000000003576b622>] synchronize_net+0x2f/0x50 net/core/dev.c:7865 [<00000000ef59b5b8>] rollback_registered_many+0x5d9/0xb50 net/core/dev.c:6851 [<0000000075071ce7>] unregister_netdevice_many.part.0+0x1b/0x1e0 net/core/dev.c:7910 [<00000000b3908e8c>] unregister_netdevice_many+0x3b/0x50 net/core/dev.c:7909 [<000000008b1c9a93>] ip6_tnl_destroy_tunnels net/ipv6/ip6_tunnel.c:2191 [inline] [<000000008b1c9a93>] ip6_tnl_exit_net+0x3e8/0x5b0 net/ipv6/ip6_tunnel.c:2238 [<0000000068a7b1d1>] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136 [<00000000af366c0d>] cleanup_net+0x3d6/0x8a0 net/core/net_namespace.c:474 [<0000000021bfc444>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114 [<000000008723c606>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<000000006ec3fbe2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000680c450e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Showing all locks held in the system: 3 locks held by kworker/1:1/23: #0: ("%s"("ipv6_addrconf")){.+.+..}, at: [<00000000e67d45e6>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 ((addr_chk_work).work){+.+...}, at: [<00000000b97be889>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 (rtnl_mutex){+.+.+.}, at: [<000000007b499c66>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 #0: (rcu_read_lock){......}, at: [<000000004b914d2c>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] (rcu_read_lock){......}, at: [<000000004b914d2c>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 (tasklist_lock){.+.+..}, at: [<00000000b550b54d>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000a8072172>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #0: (&tty->ldisc_sem){++++++}, at: [<00000000024c8581>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 (&ldata->atomic_read_lock){+.+...}, at: [<00000000d67ffe80>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 #0: ("%s""netns"){.+.+.+}, at: [<00000000e67d45e6>] process_one_work+0x790/0x1600 kernel/workqueue.c:2107 (net_cleanup_work){+.+.+.}, at: [<00000000b97be889>] process_one_work+0x7ce/0x1600 kernel/workqueue.c:2111 (net_mutex){+.+.+.}, at: [<000000006ac3c219>] cleanup_net+0x131/0x8a0 net/core/net_namespace.c:440 (rtnl_mutex){+.+.+.}, at: [<000000007b499c66>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000cfeee3ee>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline] (rcu_preempt_state.exp_mutex){+.+...}, at: [<00000000cfeee3ee>] _synchronize_rcu_expedited+0x339/0x850 kernel/rcu/tree_exp.h:569 #0: (rtnl_mutex){+.+.+.}, at: [<0000000070b1b38b>] rtnl_lock net/core/rtnetlink.c:70 [inline] (rtnl_mutex){+.+.+.}, at: [<0000000070b1b38b>] rtnetlink_rcv+0x1c/0x40 net/core/rtnetlink.c:4086 #0: (lock#2){+.+...}, at: [<0000000007882c08>] lru_add_drain_all+0x34/0x3e0 mm/swap.c:696 (cpu_hotplug.dep_map){++++++}, at: [<000000000f0ca63c>] get_online_cpus+0x32/0x90 kernel/cpu.c:254 #0: (lock#2){+.+...}, at: [<0000000007882c08>] lru_add_drain_all+0x34/0x3e0 mm/swap.c:696 #0: (lock#2){+.+...}, at: [<0000000007882c08>] lru_add_drain_all+0x34/0x3e0 mm/swap.c:696 #0: (rtnl_mutex){+.+.+.}, at: [<000000007b499c66>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.190+ #1 ffff8801d98f7cc8 ffffffff81b66c51 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98f7d00 ffffffff81b71eec 0000000000000001 0000000000000000 0000000000000001Call Trace: [<0000000014e8b040>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000014e8b040>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000029138005>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000c0f4e49c>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000db9ea9e3>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000007dd259dc>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000007dd259dc>] check_hung_task kernel/hung_task.c:126 [inline] [<000000007dd259dc>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000007dd259dc>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000006ec3fbe2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000680c450e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22 Comm: kworker/0:1 Not tainted 4.9.190+ #1 Workqueue: events rtc_timer_do_workc task: 000000005009f525 task.stack: 00000000246ca0d3 RIP: 0010:[] c [<00000000990ed93c>] 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: ffffffff81d868d1 RDI: ffffffff84b67e18 RBP: ffff8801db6077c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff841d65aa R12: ffffffff84b67de0 R13: 0000000000000020 R14: fffffbfff096d003 R15: fffffbfff096cfc5 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3f81678f80 CR3: 0000000003026000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff84b67de0c 000000000000270cc ffff8801db607810c ffffffff81d88b74c ffff8801da73af80c ffffffff84b67e28c ffffffff84b6801ac ffffffff841d658dc ffffffff84b67de0c 0000000000000039c dffffc0000000000c 0000000000000039c Call Trace: d [<00000000f933179a>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] d [<00000000f933179a>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<000000006dde55e3>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<0000000021e12864>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<00000000794b393f>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<00000000c2b0e2fa>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<00000000e6384d1f>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594 [<0000000006ad3cf4>] console_cont_flush kernel/printk/printk.c:2321 [inline] [<0000000006ad3cf4>] console_unlock+0x17b/0xb20 kernel/printk/printk.c:2387 [<00000000d5fab7b6>] vprintk_emit+0x43f/0x6f0 kernel/printk/printk.c:1908 [<00000000dd9cd1a0>] vprintk+0x28/0x30 kernel/printk/printk.c:1918 [<00000000654ffbb9>] vprintk_func kernel/printk/internal.h:36 [inline] [<00000000654ffbb9>] printk+0xc2/0xf5 kernel/printk/printk.c:1980 [<000000004b50d5ac>] wq_watchdog_timer_fn.cold+0x11/0x66 kernel/workqueue.c:5432 [<0000000029e16f50>] call_timer_fn+0x167/0x6d0 kernel/time/timer.c:1319 [<000000006d630d5c>] expire_timers+0x25b/0x5c0 kernel/time/timer.c:1359 [<000000003b8ba0e5>] __run_timers kernel/time/timer.c:1674 [inline] [<000000003b8ba0e5>] run_timer_softirq+0x404/0x620 kernel/time/timer.c:1689 [<000000000f644e0b>] __do_softirq+0x22d/0x964 kernel/softirq.c:288 [<00000000ef9814a1>] invoke_softirq kernel/softirq.c:368 [inline] [<00000000ef9814a1>] irq_exit+0x119/0x160 kernel/softirq.c:409 [<00000000d82c413e>] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [<00000000d82c413e>] smp_apic_timer_interrupt+0x7e/0xb0 arch/x86/kernel/apic/apic.c:962 [<00000000660a26a7>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:653 d [<00000000072c0eb2>] ? rtc_aie_update_irq+0x30/0x30 drivers/rtc/interface.c:538 [<00000000684fb608>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [<00000000684fb608>] rtc_handle_legacy_irq+0x114/0x190 drivers/rtc/interface.c:521 [<00000000b803dd79>] rtc_uie_update_irq+0x20/0x30 drivers/rtc/interface.c:550 [<000000004a50e7f7>] rtc_timer_do_work+0x1fe/0x600 drivers/rtc/interface.c:881 [<0000000021bfc444>] process_one_work+0x88b/0x1600 kernel/workqueue.c:2114 [<000000008723c606>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2251 [<000000006ec3fbe2>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000680c450e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 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 c68 c7b c77 cff ceb cc2 ce8 cc1 c7b c77 cff ceb c