INFO: task syz.5.23:6097 blocked for more than 143 seconds. Not tainted 6.14.0-rc3-syzkaller-00137-g27eddbf34490 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.23 state:D stack:25984 pid:6097 tgid:6097 ppid:6076 task_flags:0x400040 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 __flush_work+0xa47/0xc60 kernel/workqueue.c:4242 __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4362 uhid_dev_destroy drivers/hid/uhid.c:584 [inline] uhid_char_release+0xac/0x600 drivers/hid/uhid.c:662 __fput+0x3e9/0x9f0 fs/file_table.c:464 task_work_run+0x24f/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0542d8d0a9 RSP: 002b:00007ffd8894c7f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000049f33 RCX: 00007f0542d8d0a9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f0542fa7ba0 R08: 0000000000000001 R09: 000000028894caef R10: 00007f0542c00000 R11: 0000000000000246 R12: 00007f0542fa5fac R13: 00007f0542fa5fa0 R14: ffffffffffffffff R15: 00007ffd8894c910 Showing all locks held in the system: 8 locks held by kworker/0:0/8: 3 locks held by kworker/u8:1/12: #0: ffff88814d745948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88814d745948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317 #1: ffffc90000117c60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc90000117c60 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317 #2: ffffffff8fec2ac8 ( rtnl_mutex ){+.+.}-{4:4} , at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] , at: addrconf_dad_work+0x10e/0x16a0 net/ipv6/addrconf.c:4190 3 locks held by kworker/1:0/25: 1 lock held by khungtaskd/30: #0: ffffffff8eb38f60 ( rcu_read_lock ){....}-{1:3} , at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] , at: rcu_read_lock include/linux/rcupdate.h:849 [inline] , at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 2 locks held by kworker/0:2/975: #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317 #1: ffffc90003877c60 ( free_ipc_work ){+.+.}-{0:0} , at: process_one_work kernel/workqueue.c:3212 [inline] , at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317 5 locks held by kworker/u8:6/1312: #0: ffff8880b873e7d8 ( &rq->__lock ){-.-.}-{2:2} , at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 #1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987 #2: ffff8880b862a398 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1046 [inline] #2: ffff8880b862a398 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x24a/0x10e0 kernel/time/timer.c:1127 #3: ffffffff9a8bafb8 (&obj_hash[i].lock){-.-.}-{2:2} , at: debug_object_activate+0x17f/0x580 lib/debugobjects.c:818 #4: ffffffff9a833bc8 ( &obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:1088 [inline] &obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1129 4 locks held by udevd/5197: #0: ffff88802d02ec30 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb4/0xd70 fs/seq_file.c:182 #1: ffff888027597088 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154 #2: ffff88807bb9a4b8 ( kn->active #5 ){++++}-{0:0} , at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155 #3: ffff88802a5c1a20 ( &dev->mutex ){....}-{4:4} , at: device_lock include/linux/device.h:1030 [inline] , at: uevent_show+0x17d/0x340 drivers/base/core.c:2729 2 locks held by getty/5580: #0: ffff88814d8520a0 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock ){+.+.}-{4:4} , at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:4/6017: 3 locks held by kworker/1:6/6074: 4 locks held by kworker/0:6/6085: 4 locks held by syz.5.23/6097: #0: ffff88807e3c4d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:480 [inline] #0: ffff88807e3c4d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2677 #1: ffff88807e3c4078 ( &hdev->lock ){+.+.}-{4:4}, at: hci_dev_close_sync+0x60d/0x1260 net/bluetooth/hci_sync.c:5185 #2: ffff88807436e338 ( &conn->lock #2 ){+.+.}-{4:4}, at: l2cap_conn_del+0x71/0x690 net/bluetooth/l2cap_core.c:1760 #3: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4} , at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline] , at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:996 3 locks held by syz-executor/6629: #0: ffffffff8fec2ac8 ( rtnl_mutex ){+.+.}-{4:4} , at: rtnl_lock net/core/rtnetlink.c:79 [inline] , at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] , at: rtnl_newlink+0xc55/0x1d30 net/core/rtnetlink.c:4021 #1: ffff8880609614e8 (&wg->device_update_lock ){+.+.}-{4:4}