INFO: task syz.6.757:6994 blocked for more than 143 seconds. Tainted: G W 6.1.120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.757 state:D stack:0 pid:6994 ppid:4643 flags:0x00000009 Call trace: __switch_to+0x308/0x598 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xef4/0x1d44 kernel/sched/core.c:6558 schedule+0xc4/0x170 kernel/sched/core.c:6634 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6693 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 blkdev_put+0xec/0x6e0 block/bdev.c:913 blkdev_close+0x58/0x94 block/fops.c:514 __fput+0x1c8/0x7c8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2080/0x2cb8 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 3 locks held by kworker/u4:1/11: #0: ffff0000c4eed938 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff80001d1f7c20 ((work_completion)(&(&rdev->dfs_update_channels_wk)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 1 lock held by rcu_tasks_kthre/12: #0: ffff800015c55570 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xd10 kernel/rcu/tasks.h:543 1 lock held by rcu_tasks_trace/13: #0: ffff800015c55d90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xd10 kernel/rcu/tasks.h:543 1 lock held by khungtaskd/28: #0: ffff800015c553a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by kworker/u4:2/39: 3 locks held by kworker/u4:4/185: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff80001deb7c20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 4 locks held by udevd/3913: #0: ffff0000f81fc540 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xac/0xc44 fs/seq_file.c:182 #1: ffff0000c2e22888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x58/0x384 fs/kernfs/file.c:154 #2: ffff0000f3df53a8 (kn->active#4){++++}-{0:0}, at: kernfs_seq_start+0x74/0x384 fs/kernfs/file.c:155 #3: ffff0000d9e910e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #3: ffff0000d9e910e8 (&dev->mutex){....}-{3:3}, at: uevent_show+0x178/0x338 drivers/base/core.c:2668 2 locks held by dhcpcd/3966: #0: ffff80001809b6c8 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x590/0x858 net/socket.c:1283 #1: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 2 locks held by getty/4054: #0: ffff0000d67fb098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001d8002f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2198 2 locks held by kworker/0:3/4338: 4 locks held by kworker/u4:8/4517: #0: ffff0000c03dd138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800021917c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff8000180a87d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x994 net/core/net_namespace.c:566 #3: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 1 lock held by udevd/6954: #0: ffff0000ce9824c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x12c/0x8ec block/bdev.c:815 1 lock held by syz.6.757/6994: #0: ffff0000ce9824c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xec/0x6e0 block/bdev.c:913 1 lock held by syz.0.1035/8003: #0: ffff0000ce9824c8 (&disk->open_mutex){+.+.}-{3:3}, at: sync_bdevs+0x150/0x28c block/bdev.c:1054 1 lock held by syz-executor/8101: #0: ffff800015c5a9b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #0: ffff800015c5a9b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3e0/0x77c kernel/rcu/tree_exp.h:962 1 lock held by syz.3.1109/8230: #0: ffff0000ce9824c8 (&disk->open_mutex){+.+.}-{3:3}, at: sync_bdevs+0x150/0x28c block/bdev.c:1054 6 locks held by syz-executor/9022: #0: ffff0000d8588460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x244/0x91c fs/read_write.c:580 #1: ffff0000f31cc888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000d099bae8 (kn->active#46){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800017476368 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x170/0x664 drivers/net/netdevsim/bus.c:160 #4: ffff0000d9e910e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #4: ffff0000d9e910e8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x90/0x480 drivers/base/dd.c:990 #5: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 2 locks held by syz.7.1325/9190: #0: ffff8000180a87d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2d0/0x58c net/core/net_namespace.c:477 #1: ffff8000180b46c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 2 locks held by kworker/1:10/9338: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800022cf7c20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 =============================================