bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves device hsr_slave_1 left promiscuous mode device hsr_slave_0 left promiscuous mode bond0 (unregistering): Released all slaves INFO: task kworker/u4:4:2873 blocked for more than 140 seconds. Not tainted 4.14.224-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D25784 2873 2 0x80000000 Workqueue: events_unbound flush_to_ldisc Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 flush_to_ldisc+0x35/0x3f0 drivers/tty/tty_buffer.c:499 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task agetty:4232 blocked for more than 140 seconds. Not tainted 4.14.224-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. agetty D27864 4232 1 0x80000002 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 down_write_failed drivers/tty/tty_ldsem.c:298 [inline] __ldsem_down_write_nested+0x2b9/0x700 drivers/tty/tty_ldsem.c:360 __tty_ldisc_lock drivers/tty/tty_ldisc.c:332 [inline] tty_ldisc_lock+0x4d/0x80 drivers/tty/tty_ldisc.c:356 tty_ldisc_hangup+0x1d3/0x6c0 drivers/tty/tty_ldisc.c:758 __tty_hangup.part.0+0x31a/0x730 drivers/tty/tty_io.c:622 __tty_hangup drivers/tty/tty_io.c:572 [inline] tty_vhangup_session+0x20/0x30 drivers/tty/tty_io.c:732 disassociate_ctty.part.0+0x98/0x750 drivers/tty/tty_jobctrl.c:266 disassociate_ctty+0x71/0x90 drivers/tty/tty_jobctrl.c:260 do_exit+0x162a/0x2850 kernel/exit.c:866 do_group_exit+0x100/0x2e0 kernel/exit.c:965 SYSC_exit_group kernel/exit.c:976 [inline] SyS_exit_group+0x19/0x20 kernel/exit.c:974 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f024fd16618 RSP: 002b:00007ffc831ff8d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f024fd16618 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00007f024fff38e0 R08: 00000000000000e7 R09: ffffffffffffff98 R10: 00007ffc831ff858 R11: 0000000000000246 R12: 00007f024fff38e0 R13: 00007f024fff8c20 R14: 0000000000000001 R15: 000000000000000a INFO: task syz-executor.0:6100 blocked for more than 140 seconds. Not tainted 4.14.224-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28880 6100 31887 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 paste_selection+0x10e/0x420 drivers/tty/vt/selection.c:373 tioclinux+0xfd/0x490 drivers/tty/vt/vt.c:2714 vt_ioctl+0x11bd/0x1d50 drivers/tty/vt/vt_ioctl.c:372 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465f69 RSP: 002b:00007f4d0e77d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004 RBP: 00000000004bfa3f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe3b348a7f R14: 00007f4d0e77d300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1531: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by kworker/u4:4/2873: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&buf->work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (&buf->lock){+.+.}, at: [] flush_to_ldisc+0x35/0x3f0 drivers/tty/tty_buffer.c:499 2 locks held by agetty/7698: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 2 locks held by agetty/4232: #0: (&tty->legacy_mutex){+.+.}, at: [] tty_lock+0x5f/0x70 drivers/tty/tty_mutex.c:19 #1: (&tty->ldisc_sem){++++}, at: [] __tty_ldisc_lock drivers/tty/tty_ldisc.c:332 [inline] #1: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_lock+0x4d/0x80 drivers/tty/tty_ldisc.c:356 2 locks held by syz-executor.1/6001: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&buf->lock){+.+.}, at: [] paste_selection+0x10e/0x420 drivers/tty/vt/selection.c:373 2 locks held by syz-executor.0/6100: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&buf->lock){+.+.}, at: [] paste_selection+0x10e/0x420 drivers/tty/vt/selection.c:373 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.224-syzkaller #0 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+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 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+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8 Comm: rcu_preempt Not tainted 4.14.224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b5414200 task.stack: ffff8880b5418000 RIP: 0010:debug_object_free lib/debugobjects.c:604 [inline] RIP: 0010:debug_object_free+0x112/0x320 lib/debugobjects.c:586 RSP: 0018:ffff8880b541fc60 EFLAGS: 00000097 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000141d RDX: 1ffff1101442e144 RSI: 0000000000000001 RDI: ffff8880a2170a28 RBP: ffff8880a2170a10 R08: 0000000000000286 R09: 00000000000c0001 R10: ffff8880b5414a88 R11: ffff8880b5414200 R12: ffff8880a2170a20 R13: ffffffff88f7fec0 R14: ffff8880b541fd18 R15: ffffffff8bfb1a08 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b04a45000 CR3: 00000000a3647000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_timer_on_stack kernel/time/timer.c:724 [inline] schedule_timeout+0x4c6/0xe90 kernel/time/timer.c:1751 rcu_gp_kthread+0xc0a/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 08 04 4c 8d 65 10 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e f9 01 00 00 83 7d 10 03 <0f> 84 c2 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1