bond0 (unregistering): Released all slaves INFO: task loop0:28243 blocked for more than 120 seconds. Not tainted 4.16.0-rc6+ #360 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. loop0 D19536 28243 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 io_schedule+0x1c/0x70 kernel/sched/core.c:5115 __blkdev_direct_IO_simple+0x7bd/0xf50 fs/block_dev.c:241 blkdev_direct_IO+0xccb/0x1060 fs/block_dev.c:428 generic_file_read_iter+0x4cc/0x28e0 mm/filemap.c:2343 blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928 call_read_iter include/linux/fs.h:1776 [inline] do_iter_readv_writev+0x630/0x830 fs/read_write.c:651 do_iter_read+0x21a/0x5a0 fs/read_write.c:895 vfs_iter_read+0x77/0xb0 fs/read_write.c:909 lo_read_transfer drivers/block/loop.c:389 [inline] do_req_filebacked drivers/block/loop.c:585 [inline] loop_handle_cmd drivers/block/loop.c:1724 [inline] loop_queue_work+0x9aa/0x3900 drivers/block/loop.c:1738 kthread_worker_fn+0x32b/0x980 kernel/kthread.c:642 loop_kthread_worker_fn+0x51/0x60 drivers/block/loop.c:841 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Showing all locks held in the system: 2 locks held by khungtaskd/802: #0: (rcu_read_lock){....}, at: [<00000000617634ac>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000617634ac>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000009d6e4845>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 4 locks held by rs:main Q:Reg/3953: #0: (&f->f_pos_lock){+.+.}, at: [<000000005b4aaa5e>] __fdget_pos+0x12b/0x190 fs/file.c:765 #1: (sb_writers#4){.+.+}, at: [<000000004456cc44>] file_start_write include/linux/fs.h:2709 [inline] #1: (sb_writers#4){.+.+}, at: [<000000004456cc44>] vfs_write+0x407/0x510 fs/read_write.c:543 #2: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000f713421f>] inode_trylock include/linux/fs.h:733 [inline] #2: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000f713421f>] ext4_file_write_iter+0x21f/0x10c0 fs/ext4/file.c:232 #3: (jbd2_handle){++++}, at: [<00000000e1f780da>] start_this_handle+0x488/0x1080 fs/jbd2/transaction.c:385 1 lock held by rsyslogd/3956: #0: (&f->f_pos_lock){+.+.}, at: [<000000005b4aaa5e>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4079: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4080: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4081: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4082: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4083: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4084: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4085: #0: (&tty->ldisc_sem){++++}, at: [<00000000974fb4f8>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005ec6a593>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 1 lock held by syz-executor1/986: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000003b83d7f4>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355 1 lock held by syz-executor1/988: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000003b83d7f4>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355 1 lock held by blkid/989: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000003b83d7f4>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 802 Comm: khungtaskd Not tainted 4.16.0-rc6+ #360 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+0x123/0x180 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:406 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