INFO: task syz-executor.5:15976 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-g2642b8a18760 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:0 pid:15976 ppid:6030 flags:0x0000000d Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6710 schedule+0xc4/0x170 kernel/sched/core.c:6786 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 __flush_workqueue+0x580/0x11c4 kernel/workqueue.c:3174 nbd_start_device_ioctl drivers/block/nbd.c:1426 [inline] __nbd_ioctl drivers/block/nbd.c:1488 [inline] nbd_ioctl+0x8dc/0xc40 drivers/block/nbd.c:1528 blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:621 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:139 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:188 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffff80008e2617d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffff80008e261b90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffff80008e261600 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:302 2 locks held by kworker/u4:2/39: 2 locks held by kworker/1:2/1612: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff80009b317c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/u5:1/5563: #0: ffff0000ccdc2138 ((wq_completion)nbd1-recv){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800099027c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/0:3/5570: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800099037c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by getty/5745: #0: ffff0000d426d098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000959302f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2187 2 locks held by kworker/1:3/5990: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800096947c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/u5:2/6023: #0: ffff0000ccf42138 ((wq_completion)nbd5-recv){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800096ea7c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/0:7/6088: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800097a37c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:5/6090: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800097a57c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:6/6096: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800097a77c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:7/6138: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff8000987a7c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/0:10/11200: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800099357c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:9/11295: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800099a57c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:10/11296: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff8000999e7c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:11/11642: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff80009cc17c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:12/11643: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff80009cbb7c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:13/13967: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff80009a1f7c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by kworker/1:14/16429: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x1480 kernel/workqueue.c:2569 #1: ffff800098d67c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f0/0x1480 kernel/workqueue.c:2571 2 locks held by syz-executor.2/19062: 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