8021q: adding VLAN 0 to HW filter on device bond0 IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready IPv6: veth0: IPv6 duplicate address fe80::a8aa:aaff:feaa:40e used by aa:aa:aa:aa:04:0e detected! IPv6: veth0: IPv6 duplicate address fe80::4:e used by aa:aa:aa:aa:04:0e detected! INFO: task syz-executor3:21540 blocked for more than 120 seconds. Not tainted 4.16.0-rc2+ #328 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D25184 21540 4281 0x00000004 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x905/0x2070 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 iterate_bdevs+0xc8/0x260 fs/block_dev.c:2145 sys_sync+0x112/0x1c0 fs/sync.c:116 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453de9 RSP: 002b:00007f64cea49c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f64cea4a6d4 RCX: 0000000000453de9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000060a R14: 00000000006f9190 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:3/80: #0: ((wq_completion)"writeback"){+.+.}, at: [<000000009aa58291>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084 #1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<00000000567294a2>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088 #2: (&type->s_umount_key#27){++++}, at: [<000000004fb74246>] trylock_super+0x20/0x100 fs/super.c:395 2 locks held by khungtaskd/798: #0: (rcu_read_lock){....}, at: [<000000004070cd75>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<000000004070cd75>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000ae267a84>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 2 locks held by getty/4197: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4198: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4199: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4200: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4201: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/4202: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 2 locks held by getty/6168: #0: (&tty->ldisc_sem){++++}, at: [<000000003dc91525>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c96546ce>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131 1 lock held by syz-executor4/21519: #0: (&bdev->bd_mutex){+.+.}, at: [<000000006a32330d>] __blkdev_put+0xbc/0x7f0 fs/block_dev.c:1757 1 lock held by syz-executor3/21540: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003a79345b>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2145 1 lock held by syz-executor3/21547: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003a79345b>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2145 1 lock held by blkid/21541: #0: (&bdev->bd_mutex){+.+.}, at: [<000000002c738e4b>] __blkdev_get+0x158/0x10e0 fs/block_dev.c:1439 1 lock held by syz-executor4/21712: #0: (&bdev->bd_mutex){+.+.}, at: [<000000002c738e4b>] __blkdev_get+0x158/0x10e0 fs/block_dev.c:1439 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 798 Comm: khungtaskd Not tainted 4.16.0-rc2+ #328 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [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+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:407 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54