INFO: task syz-executor.4:5603 blocked for more than 143 seconds. Not tainted 6.1.0-rc8-syzkaller-33330-ga5541c0811a0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:0 pid:5603 ppid:3124 flags:0x00000009 Call trace: __switch_to+0x180/0x298 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5209 [inline] __schedule+0x408/0x594 kernel/sched/core.c:6521 schedule+0x64/0xa4 kernel/sched/core.c:6597 schedule_timeout+0x64/0x1b4 kernel/time/timer.c:1911 do_wait_for_common+0xf4/0x184 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+0x2b0/0x6dc kernel/workqueue.c:2861 nbd_start_device_ioctl+0x1e4/0x2b8 drivers/block/nbd.c:1419 __nbd_ioctl+0x16c/0x334 drivers/block/nbd.c:1481 nbd_ioctl+0xec/0x13c drivers/block/nbd.c:1521 blkdev_ioctl+0x24c/0x6d8 block/ioctl.c:614 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+0xd0/0x140 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x140 arch/arm64/kernel/syscall.c:197 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffff80000d4a4768 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/12: #0: ffff80000d4a4db8 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x450 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffff80000d4a4640 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:303 2 locks held by kworker/u5:0/45: #0: ffff0000c3be9938 ((wq_completion)nbd4-recv){+.+.}-{0:0}, at: process_one_work+0x270/0x504 kernel/workqueue.c:2262 #1: ffff80000f6fbd80 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x29c/0x504 kernel/workqueue.c:2264 2 locks held by getty/2760: #0: ffff0000c8434898 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244 #1: ffff80000f6be2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x19c/0x89c drivers/tty/n_tty.c:2177 2 locks held by kworker/u4:18/6946: 3 locks held by syz-executor.4/9605: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 #2: ffff0000c3be7998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_disconnect_and_put+0x28/0x138 drivers/block/nbd.c:2099 2 locks held by syz-executor.4/9612: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 2 locks held by syz-executor.4/9618: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 2 locks held by syz-executor.4/9632: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 2 locks held by syz-executor.4/9648: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 2 locks held by syz-executor.4/9655: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 2 locks held by syz-executor.2/9608: #0: ffff80000d8948e8 (cb_lock){++++}-{3:3}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:860 #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffff80000d8947f8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x80/0x4f4 net/netlink/genetlink.c:848 =============================================