INFO: task syz-executor.0:24800 blocked for more than 143 seconds. Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:24800 ppid:6017 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_preempt_disabled+0x18/0x2c kernel/sched/core.c:6845 __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_start_device_ioctl drivers/block/nbd.c:1427 [inline] __nbd_ioctl drivers/block/nbd.c:1488 [inline] nbd_ioctl+0x8e8/0xc40 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: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+0x58/0x16c 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:591 INFO: task syz-executor.0:24807 blocked for more than 143 seconds. Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:24807 ppid:6017 flags:0x00000005 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_preempt_disabled+0x18/0x2c kernel/sched/core.c:6845 __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 blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 blkdev_open+0x124/0x2ac block/fops.c:518 do_dentry_open+0x710/0x11b8 fs/open.c:914 vfs_open+0x7c/0x90 fs/open.c:1048 do_open fs/namei.c:3636 [inline] path_openat+0x1f2c/0x27f8 fs/namei.c:3793 do_filp_open+0x1bc/0x3cc fs/namei.c:3820 do_sys_openat2+0x124/0x1b8 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1433 __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+0x58/0x16c 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:591 INFO: task syz-executor.0:24815 blocked for more than 143 seconds. Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:24815 ppid:6017 flags:0x00000005 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 blk_mq_freeze_queue_wait+0xf4/0x174 block/blk-mq.c:139 blk_freeze_queue+0xc8/0x104 block/blk-mq.c:166 blk_mq_freeze_queue+0x20/0x30 block/blk-mq.c:175 nbd_add_socket+0x174/0x770 drivers/block/nbd.c:1128 __nbd_ioctl drivers/block/nbd.c:1471 [inline] nbd_ioctl+0x20c/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: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+0x58/0x16c 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:591 INFO: task syz-executor.0:24820 blocked for more than 143 seconds. Not tainted 6.5.0-rc7-syzkaller-gfe4469582053 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:24820 ppid:6017 flags:0x00000005 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_preempt_disabled+0x18/0x2c kernel/sched/core.c:6845 __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:1521 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: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+0x58/0x16c 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:591 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/13: #0: ffff80008e2718d0 (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: ffff80008e271c90 (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: ffff80008e271700 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:302 2 locks held by getty/5746: #0: ffff0000d4b8c098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000959122f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2187 1 lock held by udevd/10140: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24800: #0: ffff0000ccb16998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_start_device_ioctl drivers/block/nbd.c:1427 [inline] #0: ffff0000ccb16998 (&nbd->config_lock){+.+.}-{3:3}, at: __nbd_ioctl drivers/block/nbd.c:1488 [inline] #0: ffff0000ccb16998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x8e8/0xc40 drivers/block/nbd.c:1528 1 lock held by syz-executor.0/24807: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24815: #0: ffff0000ccb16998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1521 1 lock held by syz-executor.0/24820: #0: ffff0000ccb16998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x128/0xc40 drivers/block/nbd.c:1521 1 lock held by syz-executor.0/24898: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24899: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24900: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24959: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24960: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 1 lock held by syz-executor.0/24961: #0: ffff0000ccb2a4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x114/0x55c block/bdev.c:803 =============================================