INFO: task kworker/0:3:14531 blocked for more than 143 seconds. Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:3 state:D stack:30816 pid:14531 tgid:14531 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6767 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824 kthread+0x1fe/0x3a0 kernel/kthread.c:382 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 3 locks held by kworker/u8:1/12: #0: ffff88801b089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90000117d80 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: idle_cull_fn+0x9a/0x450 kernel/workqueue.c:2951 1 lock held by kworker/R-mm_pe/13: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 3 locks held by kworker/1:0/25: #0: ffff88801b080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc900001f7d80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffffffff8e1c3cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 1 lock held by khungtaskd/30: #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 2 locks held by getty/4974: #0: ffff88802ece50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 4 locks held by kworker/u8:10/5658: 1 lock held by kworker/R-wg-cr/7582: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2669 1 lock held by kworker/R-wg-cr/7583: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 1 lock held by kworker/R-wg-cr/7585: 2 locks held by kworker/u8:3/9533: 3 locks held by kworker/u8:4/13690: #0: ffff88801beeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90003cd7d80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffffffff8fecb1d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xb40 net/core/net_namespace.c:580 2 locks held by kworker/u8:5/13973: 1 lock held by kworker/R-wg-cr/14144: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 1 lock held by kworker/R-bond0/14284: 1 lock held by kworker/R-wg-cr/14312: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 1 lock held by kworker/R-wg-cr/14319: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 1 lock held by kworker/R-wg-cr/14327: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2669 1 lock held by kworker/R-wg-cr/14388: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x856/0xe20 kernel/workqueue.c:3526 1 lock held by kworker/R-wg-cr/14391: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x27/0x420 kernel/workqueue.c:2669 1 lock held by kworker/R-bond0/14753: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/14756: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/14760: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/14767: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/14769: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14773: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14774: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14779: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14780: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14781: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14782: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14783: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14784: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14790: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14791: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14792: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14798: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14799: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14809: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/14815: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/14987: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15025: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15032: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15033: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/15097: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/15099: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-bond0/15118: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15122: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15125: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15128: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15130: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15131: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15134: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15137: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15138: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 1 lock held by kworker/R-wg-cr/15139: #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: set_pf_worker kernel/workqueue.c:3316 [inline] #0: ffffffff8e071ac8 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0xc6/0xe20 kernel/workqueue.c:3443 3 locks held by syz.0.802/15273: #0: ffff88807f528d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481 #1: ffff88807f528078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x346/0x1110 net/bluetooth/hci_sync.c:5183 #2: ffffffff8e1c3cb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297 1 lock held by syz.2.798/15283: #0: ffffffff8e1c3b80 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:4561 2 locks held by syz.4.804/15321: 1 lock held by syz.4.804/15323: #0: ffff888025abc198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x151/0xfd0 drivers/block/nbd.c:1572 3 locks held by syz-executor/15333: #0: ffff888070c5cd80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481 #1: ffff888070c5c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x346/0x1110 net/bluetooth/hci_sync.c:5183 #2: ffffffff90148da8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline] #2: ffffffff90148da8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2589 3 locks held by syz-executor/15347: #0: ffffffff8fecb1d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x292/0x6b0 net/core/net_namespace.c:490 #1: ffff8880437ea058 (k-sk_lock-AF_RXRPC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1609 [inline] #1: ffff8880437ea058 (k-sk_lock-AF_RXRPC){+.+.}-{0:0}, at: rxrpc_bind+0xa8/0x5a0 net/rxrpc/af_rxrpc.c:145 #2: ffff88804aecc1e8 (&rxnet->local_mutex){+.+.}-{3:3}, at: rxrpc_lookup_local+0xcb/0x1220 net/rxrpc/local_object.c:262 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111