============================================
WARNING: possible recursive locking detected
5.10.0-rc1-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.3/10150 is trying to acquire lock:
ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline]
ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: ovl_dir_real_file+0xd3/0x140 fs/overlayfs/readdir.c:886

but task is already holding lock:
ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline]
ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: ovl_ioctl_set_flags fs/overlayfs/file.c:577 [inline]
ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: ovl_ioctl+0x82/0x160 fs/overlayfs/file.c:616

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ovl_i_mutex_dir_key[depth]);
  lock(&ovl_i_mutex_dir_key[depth]);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by syz-executor.3/10150:
 #0: ffff88811eeb5460 (sb_writers#15){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1648 [inline]
 #0: ffff88811eeb5460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write_file+0x1f/0x60 fs/namespace.c:412
 #1: ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline]
 #1: ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: ovl_ioctl_set_flags fs/overlayfs/file.c:577 [inline]
 #1: ffff888114d69e20 (&ovl_i_mutex_dir_key[depth]){++++}-{3:3}, at: ovl_ioctl+0x82/0x160 fs/overlayfs/file.c:616

stack backtrace:
CPU: 1 PID: 10150 Comm: syz-executor.3 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x77/0x97 lib/dump_stack.c:118
 print_deadlock_bug kernel/locking/lockdep.c:2759 [inline]
 check_deadlock kernel/locking/lockdep.c:2800 [inline]
 validate_chain kernel/locking/lockdep.c:3591 [inline]
 __lock_acquire.cold.60+0x17a/0x2e8 kernel/locking/lockdep.c:4837
 lock_acquire+0xd0/0x420 kernel/locking/lockdep.c:5442
 down_write+0x33/0x70 kernel/locking/rwsem.c:1531
 inode_lock include/linux/fs.h:774 [inline]
 ovl_dir_real_file+0xd3/0x140 fs/overlayfs/readdir.c:886
 ovl_real_fdget+0x32/0x70 fs/overlayfs/file.c:141
 ovl_real_ioctl+0x25/0x90 fs/overlayfs/file.c:546
 ovl_ioctl_set_flags fs/overlayfs/file.c:592 [inline]
 ovl_ioctl+0xc9/0x160 fs/overlayfs/file.c:616
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x7c/0xb0 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fce60297c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000040086602 RDI: 0000000000000003
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc8c9eb7cf R14: 00007fce602989c0 R15: 000000000119bf8c