INFO: task syz-executor.1:10367 blocked for more than 143 seconds. Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:0 pid:10367 ppid:6030 flags:0x00000001 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 blk_mq_freeze_queue_wait+0xf4/0x174 block/blk-mq.c:180 blk_freeze_queue+0xc8/0x104 block/blk-mq.c:207 blk_mq_freeze_queue+0x20/0x30 block/blk-mq.c:216 nbd_add_socket+0x154/0x76c drivers/block/nbd.c:1122 __nbd_ioctl drivers/block/nbd.c:1465 [inline] nbd_ioctl+0x20c/0xc40 drivers/block/nbd.c:1522 blkdev_ioctl+0x408/0xb40 block/ioctl.c:615 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+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c 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:591 INFO: task syz-executor.1:10374 blocked for more than 143 seconds. Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:0 pid:10374 ppid:6030 flags:0x00000001 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_preempt_disabled+0x18/0x2c kernel/sched/core.c:6760 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 blkdev_ioctl+0x408/0xb40 block/ioctl.c:615 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+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c 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:591 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 2 locks held by getty/5670: #0: ffff0000d87c3098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001aad02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177 1 lock held by udevd/8559: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10344: #0: ffff0000cb183198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_start_device_ioctl drivers/block/nbd.c:1421 [inline] #0: ffff0000cb183198 (&nbd->config_lock){+.+.}-{3:3}, at: __nbd_ioctl drivers/block/nbd.c:1482 [inline] #0: ffff0000cb183198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x8e8/0xc40 drivers/block/nbd.c:1522 1 lock held by syz-executor.1/10354: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10367: #0: ffff0000cb183198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/10374: #0: ffff0000cb183198 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1515 1 lock held by syz-executor.1/10451: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10452: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10453: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10507: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10508: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 1 lock held by syz-executor.1/10509: #0: ffff0000cb5254c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8f8 block/bdev.c:735 =============================================