INFO: task kworker/u4:7:3593 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:7 D26560 3593 2 0x80000000 Workqueue: netns cleanup_net Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 cleanup_net+0x13b/0x870 net/core/net_namespace.c:453 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.4:13020 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28928 13020 4885 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 sock_do_ioctl+0x92/0xb0 net/socket.c:981 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f4901d81c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879 RDX: 0000000020000080 RSI: 0000001000008912 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4901d826d4 R13: 00000000004c0ca1 R14: 00000000004d3dd8 R15: 00000000ffffffff INFO: task syz-executor.3:13012 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28624 13012 11309 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 _synchronize_rcu_expedited+0x5a8/0x840 kernel/rcu/tree_exp.h:615 synchronize_net+0x2b/0x40 net/core/dev.c:8220 dev_deactivate_many+0x3cf/0x980 net/sched/sch_generic.c:931 __dev_close_many+0x10a/0x260 net/core/dev.c:1441 dev_close_many+0x215/0x600 net/core/dev.c:1479 rollback_registered_many+0x35b/0xab0 net/core/dev.c:7191 rollback_registered+0xe6/0x1a0 net/core/dev.c:7255 unregister_netdevice_queue net/core/dev.c:8246 [inline] unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8239 unregister_netdevice include/linux/netdevice.h:2437 [inline] ppp_release+0x18c/0x1b0 drivers/net/ppp/ppp_generic.c:408 __fput+0x25e/0x710 fs/file_table.c:210 task_work_run+0x125/0x1a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x413561 RSP: 002b:00007ffde4d8b780 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413561 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007ffde4d8b860 R11: 0000000000000293 R12: 000000000075bfc8 R13: 000000000004e9e6 R14: 0000000000760e38 R15: ffffffffffffffff INFO: task syz-executor.2:13013 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28624 13013 11923 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline] _synchronize_rcu_expedited+0x377/0x840 kernel/rcu/tree_exp.h:596 synchronize_net+0x2b/0x40 net/core/dev.c:8220 packet_release+0x7ae/0xb80 net/packet/af_packet.c:3074 __sock_release+0xd2/0x2c0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25e/0x710 fs/file_table.c:210 task_work_run+0x125/0x1a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x413561 RSP: 002b:00007ffff02b9520 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413561 RDX: 0000001b2ce20000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: 000000006fec05db R09: ffffffffffffffff R10: 00007ffff02b9600 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 00000000007609a8 R15: ffffffffffffffff INFO: task syz-executor.5:13039 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29792 13039 12648 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 inet_ioctl+0xd4/0x1d0 net/ipv4/af_inet.c:898 sock_do_ioctl+0x65/0xb0 net/socket.c:974 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f64f6b6cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879 RDX: 0000000020000200 RSI: 0000000000008914 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f64f6b6d6d4 R13: 00000000004c5695 R14: 00000000004d9da8 R15: 00000000ffffffff INFO: task syz-executor.5:13046 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D30112 13046 12648 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 inet_ioctl+0xd4/0x1d0 net/ipv4/af_inet.c:898 sock_do_ioctl+0x65/0xb0 net/socket.c:974 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f64f6b2ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879 RDX: 0000000020000000 RSI: 0000000000008914 RDI: 0000000000000003 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f64f6b2b6d4 R13: 00000000004c5695 R14: 00000000004d9da8 R15: 00000000ffffffff INFO: task syz-executor.5:13053 blocked for more than 140 seconds. Not tainted 4.14.140+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29792 13053 12648 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 inet_ioctl+0xd4/0x1d0 net/ipv4/af_inet.c:898 sock_do_ioctl+0x65/0xb0 net/socket.c:974 sock_ioctl+0x253/0x440 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459879 RSP: 002b:00007f64f6b09c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879 RDX: 0000000020000200 RSI: 0000000000008914 RDI: 0000000000000003 RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f64f6b0a6d4 R13: 00000000004c5695 R14: 00000000004d9da8 R15: 00000000ffffffff Showing all locks held in the system: 3 locks held by kworker/0:0/3: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [<00000000c69e1c18>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105 #1: ((addr_chk_work).work){+.+.}, at: [<000000001d2e0593>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109 #2: (rtnl_mutex){+.+.}, at: [<00000000ee0ea703>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000e867f7ed>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1758: #0: (&tty->ldisc_sem){++++}, at: [<0000000091a00f48>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c8f902b5>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 4 locks held by kworker/u4:7/3593: #0: ("%s""netns"){+.+.}, at: [<00000000c69e1c18>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105 #1: (net_cleanup_work){+.+.}, at: [<000000001d2e0593>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109 #2: (net_mutex){+.+.}, at: [<00000000a718c862>] cleanup_net+0x136/0x870 net/core/net_namespace.c:450 #3: (rtnl_mutex){+.+.}, at: [<00000000feec5f1c>] cleanup_net+0x13b/0x870 net/core/net_namespace.c:453 1 lock held by syz-executor.4/10462: #0: (&rtc->ops_lock){+.+.}, at: [<000000002d4bcef9>] rtc_dev_ioctl+0xe6/0x7e0 drivers/rtc/rtc-dev.c:219 1 lock held by syz-executor.4/13020: #0: (rtnl_mutex){+.+.}, at: [<0000000026da7f4a>] dev_ioctl+0x531/0xdf0 net/core/dev_ioctl.c:421 2 locks held by syz-executor.3/13012: #0: (rtnl_mutex){+.+.}, at: [<00000000fc1e4d3c>] ppp_release+0xf0/0x1b0 drivers/net/ppp/ppp_generic.c:406 #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<00000000378cb933>] exp_funnel_lock kernel/rcu/tree_exp.h:272 [inline] #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<00000000378cb933>] _synchronize_rcu_expedited+0x308/0x840 kernel/rcu/tree_exp.h:596 2 locks held by syz-executor.2/13013: #0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000de85a464>] inode_lock include/linux/fs.h:718 [inline] #0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<00000000de85a464>] __sock_release+0x86/0x2c0 net/socket.c:601 #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000001068531>] exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline] #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<0000000001068531>] _synchronize_rcu_expedited+0x377/0x840 kernel/rcu/tree_exp.h:596 1 lock held by syz-executor.5/13039: #0: (rtnl_mutex){+.+.}, at: [<000000004f39e639>] devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 1 lock held by syz-executor.5/13046: #0: (rtnl_mutex){+.+.}, at: [<000000004f39e639>] devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 1 lock held by syz-executor.5/13053: #0: (rtnl_mutex){+.+.}, at: [<000000004f39e639>] devinet_ioctl+0x18a/0x1610 net/ipv4/devinet.c:1014 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.140+ #39 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x119/0x147 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x629/0xbe0 kernel/hung_task.c:274 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 68 Comm: kworker/1:1 Not tainted 4.14.140+ #39 Workqueue: events rtc_timer_do_work task: 0000000014e93269 task.stack: 0000000070d66ee3 RIP: 0010:__wake_up_common+0x14d/0x5d0 kernel/sched/wait.c:111 RSP: 0018:ffff8881d6c77a80 EFLAGS: 00000082 RAX: 0000000000000001 RBX: ffff8881d5cd5a70 RCX: 1ffff1103ab9ab55 RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881d5cd5aa8 RBP: 0000000000000001 R08: ffff8881d5cd5a90 R09: ffff8881d6c77ad0 R10: ffffed103ab9ab4e R11: ffff8881d5cd5a73 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000135f000 CR3: 0000000185e26001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __wake_up_common_lock+0xcd/0x170 kernel/sched/wait.c:125 rtc_handle_legacy_irq+0x123/0x180 drivers/rtc/interface.c:523 rtc_timer_do_work+0x21d/0x610 drivers/rtc/interface.c:881 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Code: 08 00 74 2a 83 c3 01 83 fb 40 7e 22 49 8d 5c 24 18 48 39 1c 24 0f 85 c8 01 00 00 8b 44 24 10 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e <41> 5f c3 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85