INFO: task syz-executor.2:26903 blocked for more than 143 seconds. Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24632 pid:26903 tgid:26903 ppid:26577 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736 __schedule_loop kernel/sched/core.c:6813 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6828 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2548 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+0xa7b/0xc90 kernel/workqueue.c:4205 __cancel_work_sync+0x330/0x6d0 kernel/workqueue.c:4304 uhid_dev_destroy drivers/hid/uhid.c:584 [inline] uhid_char_release+0xaf/0x600 drivers/hid/uhid.c:662 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fe6cc47cc9a RSP: 002b:00007fe6cc6cfb10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fe6cc47cc9a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000032 R08: 0000001b2f420000 R09: 0000000000000004 R10: 000000008136099b R11: 0000000000000293 R12: 00007fe6cc000750 R13: ffffffffffffffff R14: 00007fe6cc000000 R15: 0000000000087455 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8e132020 ( rcu_read_lock ){....}-{1:2} , at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] , at: rcu_read_lock include/linux/rcupdate.h:750 [inline] , at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 7 locks held by kworker/1:1/44: 5 locks held by kworker/u8:8/2468: #0: ffff888015acd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888015acd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc90009cc7d00 ( net_cleanup_work ){+.+.}-{0:0} , at: process_one_work kernel/workqueue.c:3230 [inline] , at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f380810 ( pernet_ops_rwsem ){++++}-{3:3} , at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:591 #3: ffffffff8f38ce88 ( rtnl_mutex ){+.+.}-{3:3} , at: ieee80211_unregister_hw+0x55/0x2c0 net/mac80211/main.c:1645 #4: ffff888066b60768 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5951 [inline] (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_remove_interfaces+0x12b/0x700 net/mac80211/iface.c:2277 2 locks held by getty/4832: #0: ffff88802aead0a0 (&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:2201 6 locks held by kworker/u9:2/5085: #0: ffff888056c53148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888056c53148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc9000410fd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] ffffc9000410fd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffff888048b79060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:309 #3: ffff888048b78078 ( &hdev->lock ){+.+.}-{3:3} , at: hci_abort_conn_sync+0x1ea/0xde0 net/bluetooth/hci_sync.c:5542 #4: ffffffff8f4f5aa8 ( hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2004 [inline] hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x185/0x340 net/bluetooth/hci_conn.c:1230 #5: ffffffff8e1373b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline] #5: ffffffff8e1373b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x463/0x820 kernel/rcu/tree_exp.h:939 3 locks held by kworker/0:4/5135: 3 locks held by kworker/0:8/5140: 7 locks held by kworker/1:4/5142: 3 locks held by kworker/u8:11/11694: #0: ffff88802a3cd948 ( (wq_completion)ipv6_addrconf ){+.+.}-{0:0} , at: process_one_work kernel/workqueue.c:3229 [inline] , at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc9000cbffd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4191 3 locks held by kworker/1:5/26971: #0: ffff888014c78948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888014c78948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc90004aefd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90004aefd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 5 locks held by kworker/u9:5/27028: #0: ffff88802b794148 ((wq_completion)hci7){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] ((wq_completion)hci7){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc90009807d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90009807d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffff888048b7d060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:309 #3: ffff888048b7c078 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x1ea/0xde0 net/bluetooth/hci_sync.c:5542 #4: ffffffff8f4f5aa8 (hci_cb_list_lock){+.+.}-{3:3} , at: hci_connect_cfm include/net/bluetooth/hci_core.h:2004 [inline] , at: hci_conn_failed+0x185/0x340 net/bluetooth/hci_conn.c:1230 5 locks held by kworker/u9:6/27029: #0: ffff888056c53948 ( (wq_completion)hci1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] (wq_completion)hci1){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc90009817d00 ( (work_completion)(&hdev->cmd_sync_work) ){+.+.}-{0:0} , at: process_one_work kernel/workqueue.c:3230 [inline] , at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffff888048b75060 (&hdev->req_lock){+.+.}-{3:3} , at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:309 #3: ffff888048b74078 ( &hdev->lock ){+.+.}-{3:3} , at: hci_abort_conn_sync+0x1ea/0xde0 net/bluetooth/hci_sync.c:5542 #4: ffffffff8f4f5aa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2004 [inline] #4: ffffffff8f4f5aa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x185/0x340 net/bluetooth/hci_conn.c:1230 1 lock held by syz-executor.2/27563: #0: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592 3 locks held by kworker/u8:0/27883: #0: ffff888016b6b148 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888016b6b148 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc90004337d00 ((work_completion)(&(&rdev->dfs_update_channels_wk)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc90004337d00 ((work_completion)(&(&rdev->dfs_update_channels_wk)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: cfg80211_dfs_channels_update_work+0xbf/0x610 net/wireless/mlme.c:1021 3 locks held by kworker/u8:6/27914: #0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3229 [inline] #0: ffff888014c81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x1770 kernel/workqueue.c:3335 #1: ffffc900045d7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3230 [inline] #1: ffffc900045d7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x1770 kernel/workqueue.c:3335 #2: ffffffff8e1373b8 (rcu_state.exp_mutex){+.+.}-{3:3} , at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline] , at: synchronize_rcu_expedited+0x463/0x820 kernel/rcu/tree_exp.h:939 2 locks held by syz-executor.0/27940: #0: ffffffff8f3f1a30 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1216 #1: ffffffff8f38ce88 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16401 2 locks held by syz-executor.4/27937: #0: ffffffff8f3f1a30 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1216 #1: ffffffff8f38ce88 ( rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16401 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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