INFO: task syz.0.27:6084 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.27 state:D stack:0 pid:6084 ppid:5982 flags:0x00000001 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5245 [inline] __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562 schedule+0xc4/0x170 kernel/sched/core.c:6638 rwsem_down_write_slowpath+0xb60/0x1280 kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 inode_lock include/linux/fs.h:758 [inline] open_last_lookups fs/namei.c:3555 [inline] path_openat+0x5f4/0x26bc fs/namei.c:3788 do_filp_open+0x194/0x384 fs/namei.c:3818 do_sys_openat2+0x134/0x3f4 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x118/0x14c fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 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: 1 lock held by rcu_tasks_kthre/12: #0: ffff8000153f7c30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff8000153f8450 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffff8000153f72c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4081: #0: ffff0000d65df098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001cff62f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xfa0 drivers/tty/n_tty.c:2198 1 lock held by syz.0.27/6081: 1 lock held by syz.0.27/6084: #0: ffff0000e56e5bf0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e56e5bf0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff0000e56e5bf0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 2 locks held by syz.1.28/6606: 1 lock held by syz.1.28/6608: #0: ffff0000e56e6138 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e56e6138 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff0000e56e6138 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 1 lock held by syz.2.29/7039: 1 lock held by syz.2.29/7040: #0: ffff000105a74c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff000105a74c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff000105a74c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 1 lock held by syz.3.30/7404: 1 lock held by syz.3.30/7406: #0: ffff000105a75160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff000105a75160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff000105a75160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 1 lock held by syz.4.31/7852: 1 lock held by syz.4.31/7855: #0: ffff0000e56e5160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e56e5160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff0000e56e5160 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 2 locks held by syz.5.32/8221: 1 lock held by syz.5.32/8223: #0: ffff000105a756a8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff000105a756a8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff000105a756a8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 1 lock held by syz.6.33/8664: 1 lock held by syz.6.33/8667: #0: ffff0000e56e4c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #0: ffff0000e56e4c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #0: ffff0000e56e4c18 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 6 locks held by syz-executor/8968: #0: ffff0000d7e32460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x244/0x7f0 fs/read_write.c:580 #1: ffff0000d0345c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x4c0 fs/kernfs/file.c:343 #2: ffff0000cfe76a00 (kn->active#56){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline] #2: ffff0000cfe76a00 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x200/0x4c0 fs/kernfs/file.c:344 #3: ffff800016c3a908 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xdc/0x32c drivers/net/netdevsim/bus.c:209 #4: ffff0000f0a4c0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline] #4: ffff0000f0a4c0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1080 [inline] #4: ffff0000f0a4c0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x6d0 drivers/base/dd.c:1283 #5: ffff0000f0a4f2f8 (&devlink->lock_key#8){+.+.}-{3:3}, at: devl_lock+0x24/0x34 net/devlink/leftover.c:275 =============================================