INFO: task kworker/u8:0:5 blocked for more than 120 seconds. Not tainted 4.13.0-rc7-next-20170829+ #11 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u8:0 D22568 5 2 0x80000000 Workqueue: kkcmd kcm_tx_work Call Trace: context_switch kernel/sched/core.c:2792 [inline] __schedule+0x8e8/0x2070 kernel/sched/core.c:3371 schedule+0x108/0x440 kernel/sched/core.c:3430 __lock_sock+0x1dc/0x2f0 net/core/sock.c:2245 lock_sock_nested+0xf3/0x110 net/core/sock.c:2766 lock_sock include/net/sock.h:1459 [inline] kcm_sendpage+0x16e/0x1880 net/kcm/kcmsock.c:774 kernel_sendpage+0x8d/0xe0 net/socket.c:3387 kcm_write_msgs+0x404/0x1b80 net/kcm/kcmsock.c:646 kcm_tx_work+0x2e/0x190 net/kcm/kcmsock.c:731 process_one_work+0xbff/0x1bf0 kernel/workqueue.c:2119 worker_thread+0x223/0x1860 kernel/workqueue.c:2254 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Showing all locks held in the system: 3 locks held by kworker/u8:0/5: #0: ("%s""kkcmd"){+.+.}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("%s""kkcmd"){+.+.}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("%s""kkcmd"){+.+.}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("%s""kkcmd"){+.+.}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("%s""kkcmd"){+.+.}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("%s""kkcmd"){+.+.}, at: [] process_one_work+0xad4/0x1bf0 kernel/workqueue.c:2090 #1: ((&kcm->tx_work)){+.+.}, at: [] process_one_work+0xb2c/0x1bf0 kernel/workqueue.c:2094 #2: (sk_lock-AF_KCM){+.+.}, at: [] lock_sock include/net/sock.h:1459 [inline] #2: (sk_lock-AF_KCM){+.+.}, at: [] kcm_tx_work+0x26/0x190 net/kcm/kcmsock.c:726 2 locks held by khungtaskd/660: #0: (rcu_read_lock){....}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd2/0x410 kernel/locking/lockdep.c:4552 2 locks held by getty/2935: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2936: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2937: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2938: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2939: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2940: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 2 locks held by getty/2941: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a40 drivers/tty/n_tty.c:2133 ============================================= NMI backtrace for cpu 3 CPU: 3 PID: 660 Comm: khungtaskd Not tainted 4.13.0-rc7-next-20170829+ #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 nmi_cpu_backtrace+0x20e/0x240 lib/nmi_backtrace.c:102 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:61 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 trigger_all_cpu_backtrace include/linux/nmi.h:105 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Sending NMI from CPU 3 to CPUs 0-2: NMI backtrace for cpu 2 CPU: 2 PID: 2966 Comm: syzkaller166788 Not tainted 4.13.0-rc7-next-20170829+ #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff880069348540 task.stack: ffff88006ba78000 RIP: 0010:IS_ERR_OR_NULL include/linux/err.h:40 [inline] RIP: 0010:match_held_lock+0x321/0x9f0 kernel/locking/lockdep.c:3581 RSP: 0000:ffff88006ba7f4c0 EFLAGS: 00000046 RAX: 0000000000000003 RBX: 1ffff1000d74fe9d RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff85b38700 RDI: ffff880069348dfa RBP: ffff88006ba7f5f0 R08: 0000000000029110 R09: 0000000000000000 R10: ffffffffffffffe8 R11: 0000000000000000 R12: ffff880069348540 R13: ffff880069348dd8 R14: ffffffff85b38700 R15: ffff88006ba7f5c8 FS: 0000000000b8d880(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000206d4fed CR3: 000000003b012000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held+0xbc/0x140 kernel/locking/lockdep.c:3822 lock_is_held_type+0x118/0x210 kernel/locking/lockdep.c:4040 lock_is_held include/linux/lockdep.h:436 [inline] ___might_sleep+0x39b/0x470 kernel/sched/core.c:5987 clear_huge_page+0x2ae/0x720 mm/memory.c:4549 __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline] do_huge_pmd_anonymous_page+0x59c/0x1ba0 mm/huge_memory.c:728 create_huge_pmd mm/memory.c:3802 [inline] __handle_mm_fault+0x1827/0x39c0 mm/memory.c:4005 handle_mm_fault+0x3bb/0x860 mm/memory.c:4071 __do_page_fault+0x4f6/0xb60 arch/x86/mm/fault.c:1445 trace_do_page_fault+0x141/0x730 arch/x86/mm/fault.c:1538 do_async_page_fault+0x72/0xc0 arch/x86/kernel/kvm.c:266 async_page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1093 RIP: 0033:0x401261 RSP: 002b:00007ffc556a2840 EFLAGS: 00010246 RAX: ffffffffffffffff RBX: 00000000006c3a80 RCX: 0000000000434fd9 RDX: 0000000020ef6ffc RSI: 00000000000089e2 RDI: ffffffffffffffff RBP: ffffffffffffffff R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 025d238fd667d3f5 R13: f35e9d661f9b6c2e R14: 00000000004019e0 R15: 0000000000000000 Code: 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 20 06 00 00 8b 15 d4 b0 b6 05 85 d2 75 11 e8 94 6e 01 00 48 85 c0 49 89 c4 0f 85 ed fd ff ff <31> d2 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 00 48 NMI backtrace for cpu 0 CPU: 0 PID: 2850 Comm: rs:main Q:Reg Not tainted 4.13.0-rc7-next-20170829+ #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006b26e5c0 task.stack: ffff880069720000 RIP: 0033:0x7f543bdb6177 RSP: 002b:00007f543a356f98 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000400 RCX: 0000000000000000 RDX: 0000000000000400 RSI: 00000000008b0a90 RDI: 0000000000000005 RBP: 00000000008b0a90 R08: 5d3632323832322e R09: 00000000008d0240 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 00007f543a357410 R14: 00000000008d23f0 R15: 00000000008b0890 FS: 00007f543a358700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ef3000 CR3: 00000000682a2000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0-rc7-next-20170829+ #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88003e04e340 task.stack: ffff88003e050000 RIP: 0010:__lock_unpin_lock kernel/locking/lockdep.c:3886 [inline] RIP: 0010:lock_unpin_lock+0x189/0x400 kernel/locking/lockdep.c:4096 RSP: 0018:ffff88003ed075f8 EFLAGS: 00000097 RAX: 0000000000000003 RBX: ffff88003e04e340 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000005840 RDI: ffffffff85cc10c0 RBP: ffff88003ed07640 R08: ffff88007fff705c R09: ffff88006df26610 R10: ffff88007fff7050 R11: ffff88007fff705d R12: ffff88003e04e340 R13: ffff88003ed07a18 R14: ffff88006df25c18 R15: ffff88003ed07978 FS: 0000000000000000(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ef3000 CR3: 000000006b9f5000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rq_unpin_lock kernel/sched/sched.h:932 [inline] rq_unlock kernel/sched/sched.h:1762 [inline] load_balance+0x1161/0x3230 kernel/sched/fair.c:8211 rebalance_domains+0x786/0xcc0 kernel/sched/fair.c:8816 run_rebalance_domains+0x383/0x780 kernel/sched/fair.c:9038 __do_softirq+0x2bd/0xbd4 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 scheduler_ipi+0x165/0x460 kernel/sched/core.c:1790 __smp_reschedule_interrupt arch/x86/kernel/smp.c:262 [inline] smp_reschedule_interrupt+0x61/0x80 arch/x86/kernel/smp.c:268 reschedule_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53 RSP: 0018:ffff88003e057db0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff10007c0afb9 RCX: 0000000000000000 RDX: 1ffffffff0b592f8 RSI: 0000000000000001 RDI: ffffffff85ac97c0 RBP: ffff88003e057db0 R08: ffffffff857e9a88 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac97b0 R13: ffff88003e057e68 R14: 0000000000000000 R15: ffff88003e04e340 arch_safe_halt arch/x86/include/asm/paravirt.h:98 [inline] default_idle+0xbf/0x460 arch/x86/kernel/process.c:341 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:332 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x256/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 start_secondary+0x277/0x310 arch/x86/kernel/smpboot.c:275 secondary_startup_64+0xa5/0xa5 arch/x86/kernel/head_64.S:235 Code: fc ff df 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 65 4c 8b 24 25 40 65 01 00 38 d0 7c 08 84 d2 0f 85 37 02 00 00 8b 15 27 12 78 04 <85> d2 0f 84 eb 00 00 00 49 8d 84 24 90 08 00 00 48 89 c2 48 89