INFO: task kworker/u4:18:7491 blocked for more than 145 seconds. Not tainted 6.3.0-rc7-syzkaller-g327bf9bb94cf #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:18 state:D stack:0 pid:7491 ppid:2 flags:0x00000008 Workqueue: events_unbound io_ring_exit_work Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5307 [inline] __schedule+0x103c/0x1e2c kernel/sched/core.c:6625 schedule+0xc4/0x170 kernel/sched/core.c:6701 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 io_ring_exit_work+0x600/0x6ec io_uring/io_uring.c:3027 process_one_work+0x788/0x12d4 kernel/workqueue.c:2390 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2537 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015e4f0d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffff800015e4f8d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffff800015e4ef00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:326 3 locks held by kworker/u4:4/1770: 1 lock held by udevd/5518: 2 locks held by getty/5672: #0: ffff0000d8e78098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001ab002f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.1/6037: #0: ffff0001b42a0818 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:539 [inline] #0: ffff0001b42a0818 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1366 [inline] #0: ffff0001b42a0818 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1653 [inline] #0: ffff0001b42a0818 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2bc/0x1e2c kernel/sched/core.c:6542 5 locks held by syz-executor.4/6042: 2 locks held by kworker/0:9/6116: #0: ffff0000c0021d38 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2363 #1: ffff80001ec97c20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2365 2 locks held by kworker/u4:18/7491: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2363 #1: ffff800020077c20 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2365 1 lock held by syz-executor.3/19306: #0: ffff0001335c3210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0001335c3210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff0001335c3210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x80/0x1fc net/socket.c:1395 2 locks held by syz-executor.2/19332: #0: ffff0000e07cb210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e07cb210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff0000e07cb210 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x80/0x1fc net/socket.c:1395 #1: ffff800015e54378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline] #1: ffff800015e54378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x37c/0x728 kernel/rcu/tree_exp.h:989 5 locks held by syz-executor.2/19349: #0: ffff8000184c9b10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1075 #1: ffff8000184c99c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff8000184c99c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x120/0xc1c net/netlink/genetlink.c:1063 #2: ffff80001846dd48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:75 #3: ffff00012da513e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_set_device+0x15c/0x1aa4 drivers/net/wireguard/netlink.c:505 #4: ffff800015e54378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline] #4: ffff800015e54378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3ac/0x728 kernel/rcu/tree_exp.h:989 2 locks held by syz-executor.0/19341: #0: ffff0000dde2e810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000dde2e810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:652 [inline] #0: ffff0000dde2e810 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x80/0x1fc net/socket.c:1395 #1: ffff0000d9736130 (sk_lock-AF_CAN){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1697 [inline] #1: ffff0000d9736130 (sk_lock-AF_CAN){+.+.}-{0:0}, at: bcm_release+0x1bc/0x7f0 net/can/bcm.c:1527 2 locks held by syz-executor.1/19353: #0: ffff8000184c9b10 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1075 #1: ffff8000184c99c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff8000184c99c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x120/0xc1c net/netlink/genetlink.c:1063 =============================================