INFO: task syz-executor.0:21612 blocked for more than 430 seconds.
      Tainted: G        W          6.9.0-syzkaller-12277-g56fb6f92854f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:21612 tgid:21611 ppid:18179  flags:0x0000000d
Call trace:
 __switch_to+0x1c8/0x2a0 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xad4/0x2b18 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xd0/0x304 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804
 nbd_start_device_ioctl drivers/block/nbd.c:1467 [inline]
 __nbd_ioctl drivers/block/nbd.c:1527 [inline]
 nbd_ioctl+0x224/0xba0 drivers/block/nbd.c:1567
 blkdev_ioctl+0x228/0x774 block/ioctl.c:676
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x124/0x190 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
INFO: task syz-executor.0:21615 blocked for more than 430 seconds.
      Tainted: G        W          6.9.0-syzkaller-12277-g56fb6f92854f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:21615 tgid:21611 ppid:18179  flags:0x00000005
Call trace:
 __switch_to+0x1c8/0x2a0 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xad4/0x2b18 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xd0/0x304 kernel/sched/core.c:6837
 blk_mq_freeze_queue_wait+0xfc/0x130 block/blk-mq.c:139
 blk_freeze_queue block/blk-mq.c:166 [inline]
 blk_mq_freeze_queue+0x20/0x30 block/blk-mq.c:175
 nbd_set_size drivers/block/nbd.c:363 [inline]
 __nbd_ioctl drivers/block/nbd.c:1518 [inline]
 nbd_ioctl+0x7bc/0xba0 drivers/block/nbd.c:1567
 blkdev_ioctl+0x228/0x774 block/ioctl.c:676
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x124/0x190 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
INFO: task syz-executor.1:21638 blocked for more than 430 seconds.
      Tainted: G        W          6.9.0-syzkaller-12277-g56fb6f92854f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:0     pid:21638 tgid:21637 ppid:17924  flags:0x0000000d
Call trace:
 __switch_to+0x1c8/0x2a0 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xad4/0x2b18 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xd0/0x304 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804
 sync_bdevs+0xc0/0x254 block/bdev.c:1240
 ksys_sync+0xc8/0x150 fs/sync.c:105
 __arm64_sys_sync+0x10/0x20 fs/sync.c:113
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffff800086a2e100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x44/0x2d4 kernel/locking/lockdep.c:6608
2 locks held by getty/3135:
 #0: ffff00001324a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80008988d2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x93c/0xe9c drivers/tty/n_tty.c:2201
1 lock held by sshd/3192:
1 lock held by udevd/21602:
 #0: ffff000010d1b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x2c4/0xa48 block/bdev.c:897
1 lock held by syz-executor.0/21612:
 #0: ffff000010d31998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_start_device_ioctl drivers/block/nbd.c:1467 [inline]
 #0: ffff000010d31998 (&nbd->config_lock){+.+.}-{3:3}, at: __nbd_ioctl drivers/block/nbd.c:1527 [inline]
 #0: ffff000010d31998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x224/0xba0 drivers/block/nbd.c:1567
1 lock held by syz-executor.0/21615:
 #0: ffff000010d31998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x100/0xba0 drivers/block/nbd.c:1560
1 lock held by syz-executor.1/21638:
 #0: ffff000010d1b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: sync_bdevs+0xc0/0x254 block/bdev.c:1240
2 locks held by udevd/22564:
1 lock held by syz-executor.0/22669:
1 lock held by syz-executor.1/23147:

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