INFO: task syz.4.901:8667 blocked for more than 143 seconds. Not tainted 6.10.0-rc7-syzkaller-00025-ga19ea421490d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.901 state:D stack:23680 pid:8667 tgid:8658 ppid:8019 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x1796/0x49d0 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa27/0x27e0 kernel/exit.c:876 do_group_exit+0x207/0x2c0 kernel/exit.c:1025 get_signal+0x16a1/0x1740 kernel/signal.c:2909 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc4f4b75bd9 RSP: 002b:00007fc4f5a100f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fc4f4d04040 RCX: 00007fc4f4b75bd9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc4f4d04040 RBP: 00007fc4f4d04038 R08: 00007fc4f5a106c0 R09: 00007fc4f5a106c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc4f4d04044 R13: 000000000000006e R14: 00007fff532b4280 R15: 00007fff532b4368 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by kswapd0/88: 3 locks held by kworker/u8:8/2802: #0: ffff88802a0d2948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff88802a0d2948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90009f37d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90009f37d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4193 2 locks held by kworker/u8:11/2912: 2 locks held by getty/4843: #0: ffff88802fad80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 3 locks held by kworker/1:7/5199: #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline] #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329 #1: ffffc90004af7d00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline] #1: ffffc90004af7d00 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329 #2: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #2: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:939 2 locks held by syz.2.850/8458: 2 locks held by vhost-8473/8475: 2 locks held by syz.4.901/8667: #0: ffff888043140070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff888043140070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff888043144c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff888043144c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 2 locks held by vhost-8667/8668: 2 locks held by syz.1.950/8892: #0: ffff88804eca0070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff88804eca0070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff88804eca4c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff88804eca4c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 3 locks held by vhost-8893/8895: 3 locks held by syz-executor/8983: #0: ffff8880306d0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] #0: ffff8880306d0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2728 #1: ffff8880306d0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x494/0xf60 net/bluetooth/hci_sync.c:5063 #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline] #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2593 2 locks held by syz.3.1029/9296: #0: ffff88808b810070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff88808b810070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff88808b814c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff88808b814c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 2 locks held by vhost-9301/9305: 2 locks held by syz.2.1041/9334: #0: ffff888098f90070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff888098f90070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff888098f94c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff888098f94c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 2 locks held by vhost-9340/9350: 2 locks held by syz.0.1066/9451: #0: ffff888089940070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff888089940070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff888089944c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff888089944c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 2 locks held by vhost-9456/9461: 2 locks held by syz.4.1118/9735: #0: ffff888078140070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:624 [inline] #0: ffff888078140070 (&dev->mutex#4){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x199/0x410 drivers/vhost/vsock.c:745 #1: ffff888078144c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_stop drivers/vhost/vsock.c:635 [inline] #1: ffff888078144c70 (&vq->mutex){+.+.}-{3:3}, at: vhost_vsock_dev_release+0x1e8/0x410 drivers/vhost/vsock.c:745 2 locks held by vhost-9736/9740: 3 locks held by syz-executor/9829: #0: ffff8880236c4d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] #0: ffff8880236c4d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2728 #1: ffff8880236c4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x494/0xf60 net/bluetooth/hci_sync.c:5063 #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline] #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2593 5 locks held by kworker/u8:5/9921: 3 locks held by syz.3.1191/10038: #0: ffff88802d5c4d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:510 [inline] #0: ffff88802d5c4d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2728 #1: ffff88802d5c4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x494/0xf60 net/bluetooth/hci_sync.c:5063 #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline] #2: ffffffff8f73f008 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2593 2 locks held by syz.0.1193/10044: #0: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f5d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632 #1: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline] #1: ffffffff8e3392f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:939 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc7-syzkaller-00025-ga19ea421490d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111