INFO: task syz-executor.0:6722 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller-00020-g573067a5a685 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6722 tgid:6721 ppid:6620 flags:0x0000000d Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1744/0x27f0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6848 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6905 __mutex_lock_common+0xeec/0x28f4 kernel/locking/mutex.c:665 __mutex_lock kernel/locking/mutex.c:735 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 nbd_start_device_ioctl drivers/block/nbd.c:1479 [inline] __nbd_ioctl drivers/block/nbd.c:1539 [inline] nbd_ioctl+0x8d8/0xc38 drivers/block/nbd.c:1579 blkdev_ioctl+0x3a8/0xa8c block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz-executor.0:6730 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller-00020-g573067a5a685 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6730 tgid:6721 ppid:6620 flags:0x00000005 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1744/0x27f0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6848 blk_mq_freeze_queue_wait+0xf4/0x174 block/blk-mq.c:198 blk_mq_freeze_queue+0x8c/0x9c block/blk-mq.c:214 nbd_add_socket+0x174/0x770 drivers/block/nbd.c:1189 __nbd_ioctl drivers/block/nbd.c:1522 [inline] nbd_ioctl+0x210/0xc38 drivers/block/nbd.c:1579 blkdev_ioctl+0x3a8/0xa8c block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1cc fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff80008fb82560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 2 locks held by getty/6184: #0: ffff0000cc9c30a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009ba2b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 1 lock held by udevd/6635: #0: ffff0000ca4e74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:904 1 lock held by syz-executor.0/6722: #0: ffff0000ca549198 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_start_device_ioctl drivers/block/nbd.c:1479 [inline] #0: ffff0000ca549198 (&nbd->config_lock){+.+.}-{4:4}, at: __nbd_ioctl drivers/block/nbd.c:1539 [inline] #0: ffff0000ca549198 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x8d8/0xc38 drivers/block/nbd.c:1579 3 locks held by syz-executor.0/6730: #0: ffff0000ca549198 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x128/0xc38 drivers/block/nbd.c:1572 #1: ffff0000ca453b28 (&q->q_usage_counter(io)#33){++++}-{0:0}, at: nbd_add_socket+0x174/0x770 drivers/block/nbd.c:1189 #2: ffff0000ca453b60 (&q->q_usage_counter(queue)#17){+.+.}-{0:0}, at: nbd_add_socket+0x174/0x770 drivers/block/nbd.c:1189 1 lock held by syz-executor.0/6906: #0: ffff0000ca4e74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:904 1 lock held by syz-executor.0/6907: #0: ffff0000ca4e74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:904 1 lock held by syz-executor.0/6923: #0: ffff0000ca4e74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:904 1 lock held by syz-executor.0/6924: #0: ffff0000ca4e74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:904 =============================================