INFO: task syz.2.129:5185 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.129 state:D stack:0 pid:5185 ppid:4329 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 INFO: task syz.2.129:5189 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.129 state:D stack:0 pid:5189 ppid:4329 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_nested+0x90/0x94 kernel/locking/rwsem.c:1690 inode_lock_nested include/linux/fs.h:793 [inline] filename_create+0x1b0/0x3a8 fs/namei.c:3884 do_mkdirat+0xac/0x3ec fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152 __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: ffff8000153e7c30 (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: ffff8000153e8450 (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: ffff8000153e72c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4078: #0: ffff0000d64a7098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800020a0e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xfa0 drivers/tty/n_tty.c:2198 1 lock held by udevd/4310: 1 lock held by udevd/4434: 2 locks held by kworker/1:18/4485: 2 locks held by kworker/0:13/4552: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b8/0x13a4 kernel/workqueue.c:2265 #1: ffff800021fc7c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6fc/0x13a4 kernel/workqueue.c:2267 2 locks held by kworker/u4:11/4567: 4 locks held by kworker/u4:15/4758: 3 locks held by kworker/u4:20/4854: 3 locks held by syz.2.129/5077: 2 locks held by syz.2.129/5185: #0: ffff0000d9ca6460 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000e1f88748 (&ovl_i_mutex_dir_key[depth]#2){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000e1f88748 (&ovl_i_mutex_dir_key[depth]#2){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff0000e1f88748 (&ovl_i_mutex_dir_key[depth]#2){++++}-{3:3}, at: path_openat+0x5f4/0x26bc fs/namei.c:3788 2 locks held by syz.2.129/5189: #0: ffff0000d9ca6460 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000e1f88748 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff0000e1f88748 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{3:3}, at: filename_create+0x1b0/0x3a8 fs/namei.c:3884 3 locks held by syz-executor/5663: #0: ffff00014c2e40e0 (&type->s_umount_key#49){+.+.}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015923ae8 (uuid_mutex){+.+.}-{3:3}, at: btrfs_close_devices+0xc8/0x448 fs/btrfs/volumes.c:1240 #2: ffff80001c6e1f88 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:968 [inline] #2: ffff80001c6e1f88 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x148/0x46c lib/debugobjects.c:1009 1 lock held by syz.1.932/8554: =============================================