INFO: task syz-executor:6572 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6572 tgid:6572 ppid:1 task_flags:0x400140 flags:0x00800011 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1250/0x2a7c kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6960 wb_wait_for_completion+0x328/0x5f0 fs/fs-writeback.c:226 __writeback_inodes_sb_nr+0x1c4/0x230 fs/fs-writeback.c:2808 writeback_inodes_sb_nr fs/fs-writeback.c:2825 [inline] writeback_inodes_sb+0x78/0x8c fs/fs-writeback.c:2840 sync_filesystem+0xa0/0x218 fs/sync.c:54 generic_shutdown_super+0x70/0x2b8 fs/super.c:622 kill_block_super+0x44/0x90 fs/super.c:1722 kill_f2fs_super+0x2cc/0x580 fs/f2fs/super.c:5454 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1318 __cleanup_mnt+0x20/0x30 fs/namespace.c:1325 task_work_run+0x1dc/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x10c/0x18c kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x17c/0x26c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 3 locks held by kworker/0:0H/11: 3 locks held by kworker/u8:0/12: 5 locks held by kworker/1:0/24: #0: ffff0000c31f8d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff800097dc7be0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000cfcea198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #2: ffff0000cfcea198 (&dev->mutex){....}-{4:4}, at: hub_event+0x13c/0x3f0c drivers/usb/core/hub.c:5899 #3: ffff0000cfcee528 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline] #3: ffff0000cfcee528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline] #3: ffff0000cfcee528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] #3: ffff0000cfcee528 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline] #3: ffff0000cfcee528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x1abc/0x3f0c drivers/usb/core/hub.c:5953 #4: ffff0000cb2eca68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5465 [inline] #4: ffff0000cb2eca68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] #4: ffff0000cb2eca68 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline] #4: ffff0000cb2eca68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x1ae4/0x3f0c drivers/usb/core/hub.c:5953 1 lock held by khungtaskd/32: #0: ffff80008fa5b6e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 1 lock held by pr/ttyAMA-1/43: 2 locks held by getty/6352: #0: ffff0000d5a260a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800099f1e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfc8 drivers/tty/n_tty.c:2211 3 locks held by udevd/6564: 1 lock held by syz-executor/6572: #0: ffff0000d38e40e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff0000d38e40e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff0000d38e40e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:506 4 locks held by kworker/0:6/6641: 5 locks held by kworker/1:7/6718: #0: ffff0000c31f8d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x63c/0x1558 kernel/workqueue.c:3231 #1: ffff8000a0247be0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x6d0/0x1558 kernel/workqueue.c:3231 #2: ffff0000cfebf198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline] #2: ffff0000cfebf198 (&dev->mutex){....}-{4:4}, at: hub_event+0x13c/0x3f0c drivers/usb/core/hub.c:5899 #3: ffff0000cfeda528 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline] #3: ffff0000cfeda528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline] #3: ffff0000cfeda528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] #3: ffff0000cfeda528 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline] #3: ffff0000cfeda528 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x1abc/0x3f0c drivers/usb/core/hub.c:5953 #4: ffff0000cb18ff68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5465 [inline] #4: ffff0000cb18ff68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] #4: ffff0000cb18ff68 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline] #4: ffff0000cb18ff68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x1ae4/0x3f0c drivers/usb/core/hub.c:5953 3 locks held by kworker/u8:26/8938: 2 locks held by syz.2.797/10745: 5 locks held by syz.5.795/10746: 2 locks held by syz.0.799/10752: =============================================