INFO: task syz-executor.2:8926 blocked for more than 143 seconds. Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:0 pid:8926 tgid:8925 ppid:6195 flags:0x00000005 Call trace: __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5400 [inline] __schedule+0x1498/0x24b4 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xb8/0x19c kernel/sched/core.c:6817 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6874 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 exfat_lookup+0x150/0x1400 fs/exfat/namei.c:729 lookup_open fs/namei.c:3478 [inline] open_last_lookups fs/namei.c:3569 [inline] path_openat+0xc90/0x2830 fs/namei.c:3799 do_filp_open+0x1bc/0x3cc fs/namei.c:3829 do_sys_openat2+0x124/0x1b8 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1430 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc 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/29: #0: ffff80008ee74ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:297 2 locks held by getty/5926: #0: ffff0000d231c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800093fc02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201 6 locks held by kworker/0:8/6265: #0: ffff0000c2864538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x560/0x1204 kernel/workqueue.c:2606 #1: ffff800097f47c20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x5a0/0x1204 kernel/workqueue.c:2608 #2: ffff0000cce6d190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline] #2: ffff0000cce6d190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b4/0x435c drivers/usb/core/hub.c:5811 #3: ffff0000cce6f528 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3169 [inline] #3: ffff0000cce6f528 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5380 [inline] #3: ffff0000cce6f528 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline] #3: ffff0000cce6f528 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline] #3: ffff0000cce6f528 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x1e14/0x435c drivers/usb/core/hub.c:5865 #4: ffff0000cbde4168 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5381 [inline] #4: ffff0000cbde4168 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline] #4: ffff0000cbde4168 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline] #4: ffff0000cbde4168 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x1e3c/0x435c drivers/usb/core/hub.c:5865 #5: ffff800090bb3550 (ehci_cf_port_reset_rwsem){.+.+}-{3:3}, at: hub_port_reset+0x190/0x15c8 drivers/usb/core/hub.c:2984 3 locks held by syz-executor.2/8926: #0: ffff0000ccd92420 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000f31c0fc8 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff0000f31c0fc8 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: open_last_lookups fs/namei.c:3566 [inline] #1: ffff0000f31c0fc8 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: path_openat+0x5f0/0x2830 fs/namei.c:3799 #2: ffff0000ccd900e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_lookup+0x150/0x1400 fs/exfat/namei.c:729 5 locks held by syz-executor.2/8936: 1 lock held by syz-executor.1/18580: #0: ffff0000fa3f0130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:954 [inline] #0: ffff0000fa3f0130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: send_break+0xc0/0x290 drivers/tty/tty_io.c:2489 3 locks held by syz-executor.3/18589: #0: ffff0000d8014420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:453 #1: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_fileattr_set+0x110/0xad4 fs/ioctl.c:682 #2: ffff0000d8016b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_write fs/ext4/ext4.h:1781 [inline] #2: ffff0000d8016b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ind_migrate+0x1a8/0x848 fs/ext4/migrate.c:625 3 locks held by syz-executor.3/18593: #0: ffff0000c62bdc48 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x218/0x2a4 fs/file.c:1191 #1: ffff0000d8014420 (sb_writers#3){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2794 [inline] #1: ffff0000d8014420 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x368/0xc3c fs/read_write.c:586 #2: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #2: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xac/0x4ec fs/ext4/file.c:294 2 locks held by syz-executor.3/18598: #0: ffff0000d8014420 (sb_writers#3){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2794 [inline] #0: ffff0000d8014420 (sb_writers#3){.+.+}-{0:0}, at: vfs_writev+0x3a8/0xb58 fs/read_write.c:969 #1: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff0000f321f200 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xac/0x4ec fs/ext4/file.c:294 3 locks held by syz-executor.3/18600: 2 locks held by syz-executor.4/18601: 4 locks held by dhcpcd-run-hook/18603: =============================================