INFO: task syz.4.196:5977 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.196 state:D stack:0 pid:5977 tgid:5974 ppid:4710 task_flags:0x400140 flags:0x00800001 Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5526 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7277 __schedule_loop kernel/sched/core.c:7354 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7369 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7426 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 device_lock include/linux/device.h:1104 [inline] usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c4/0xfc0 fs/open.c:996 vfs_open+0x44/0x2dc fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1084/0x18f4 fs/namei.c:5000 do_file_open+0x1c8/0x2e8 fs/namei.c:5029 do_sys_openat2+0x114/0x1e8 fs/open.c:1417 do_sys_open+0xb0/0xe0 fs/open.c:1423 __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 INFO: task syz.0.277:6404 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.277 state:D stack:0 pid:6404 tgid:6403 ppid:4715 task_flags:0x400140 flags:0x00800001 Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5526 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7277 __schedule_loop kernel/sched/core.c:7354 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7369 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7426 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 device_lock include/linux/device.h:1104 [inline] usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c4/0xfc0 fs/open.c:996 vfs_open+0x44/0x2dc fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1084/0x18f4 fs/namei.c:5000 do_file_open+0x1c8/0x2e8 fs/namei.c:5029 do_sys_openat2+0x114/0x1e8 fs/open.c:1417 do_sys_open+0xb0/0xe0 fs/open.c:1423 __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Showing all locks held in the system: locks held by khungtaskd/31: 1, last CPU#0: #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6871 locks held by getty/4494: 2, on CPU#0: #0: ffff0000c9b4c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009257e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 locks held by kworker/0:3/4720: 5, on CPU#0: #0: ffff0000c2409540 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #0: ffff0000c2409540 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3479 #1: ffff8000968b7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3371 [inline] #1: ffff8000968b7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3479 #2: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #2: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x128/0x39fc drivers/usb/core/hub.c:5912 #3: ffff0000ca78d578 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3265 [inline] #3: ffff0000ca78d578 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5477 [inline] #3: ffff0000ca78d578 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] #3: ffff0000ca78d578 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5884 [inline] #3: ffff0000ca78d578 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x191c/0x39fc drivers/usb/core/hub.c:5966 #4: ffff0000cac52660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5478 [inline] #4: ffff0000cac52660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] #4: ffff0000cac52660 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5884 [inline] #4: ffff0000cac52660 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x1948/0x39fc drivers/usb/core/hub.c:5966 locks held by syz.4.196/5977: 1, on CPU#1: #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 locks held by syz.0.277/6404: 1, on CPU#0: #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 locks held by syz.3.662/8714: 1, on CPU#0: #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 locks held by udevd/10200: 4, last CPU#0: #0: ffff0000cd9f6460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000d268d0f0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline] #1: ffff0000d268d0f0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3785 [inline] #1: ffff0000d268d0f0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: __start_renaming+0x144/0x344 fs/namei.c:3878 #2: ffff0000c8c0b2c8 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #2: ffff0000c8c0b2c8 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: lock_two_nondirectories+0xc4/0x148 fs/inode.c:1254 #3: ffff0000d3e17520 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline] #3: ffff0000d3e17520 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: lock_two_nondirectories+0xe8/0x148 fs/inode.c:1256 locks held by syz.0.939/10461: 1, on CPU#0: #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 locks held by syz.4.952/10564: 1, on CPU#0: #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #0: ffff0000ca7881d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x138/0x674 drivers/usb/core/devio.c:1054 locks held by syz.6.979/10718: 2, last CPU#0: #0: ffff0000d563c578 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline] #0: ffff0000d563c578 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x158/0xad4 mm/mmap.c:1299 #1: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #1: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffff800088d82260 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x4c/0x224 mm/pgtable-generic.c:290 locks held by rm/10719: 1, last CPU#0: #0: ffff0000dbf1f178 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:544 [inline] #0: ffff0000dbf1f178 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x228/0xad4 mm/mmap.c:1323 =============================================