INFO: task syz-executor233:6111 blocked for more than 143 seconds. Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor233 state:D stack:0 pid:6111 ppid:6110 flags:0x0000000d Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1364/0x23b4 kernel/sched/core.c:6695 schedule+0xc4/0x170 kernel/sched/core.c:6771 schedule_timeout+0xb8/0x348 kernel/time/timer.c:2143 do_wait_for_common+0x30c/0x468 kernel/sched/completion.c:95 __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:148 __flush_workqueue+0x580/0x11c4 kernel/workqueue.c:3195 nbd_start_device_ioctl drivers/block/nbd.c:1426 [inline] __nbd_ioctl drivers/block/nbd.c:1487 [inline] nbd_ioctl+0x8cc/0xc38 drivers/block/nbd.c:1527 blkdev_ioctl+0x3e4/0xae4 block/ioctl.c:630 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffff80008e513840 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:302 2 locks held by kworker/u5:1/5665: #0: ffff0000c9f41d38 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2603 #1: ffff80009e157c20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2605 1 lock held by klogd/5698: #0: ffff0001b41add58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline] #0: ffff0001b41add58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1372 [inline] #0: ffff0001b41add58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1681 [inline] #0: ffff0001b41add58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2d8/0x23b4 kernel/sched/core.c:6612 2 locks held by getty/5846: #0: ffff0000d27750a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800094c002f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2206 =============================================