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BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit

write to 0xffff88810ed3f914 of 4 bytes by task 25463 on cpu 1:
 ext4_do_update_inode fs/ext4/inode.c:5084 [inline]
 ext4_mark_iloc_dirty+0x8bb/0x1650 fs/ext4/inode.c:5721
 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5915
 __ext4_new_inode+0x2b22/0x3060 fs/ext4/ialloc.c:1335
 ext4_whiteout_for_rename fs/ext4/namei.c:3676 [inline]
 ext4_rename fs/ext4/namei.c:3789 [inline]
 ext4_rename2+0x1641/0x3210 fs/ext4/namei.c:4103
 vfs_rename+0x8ef/0xe20 fs/namei.c:4312
 ovl_do_rename fs/overlayfs/overlayfs.h:219 [inline]
 ovl_check_rename_whiteout fs/overlayfs/super.c:1253 [inline]
 ovl_make_workdir fs/overlayfs/super.c:1372 [inline]
 ovl_get_workdir fs/overlayfs/super.c:1474 [inline]
 ovl_fill_super+0x323b/0x3ab0 fs/overlayfs/super.c:2001
 mount_nodev+0x4f/0xc0 fs/super.c:1412
 ovl_mount+0x25/0x30 fs/overlayfs/super.c:2093
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x190 fs/super.c:1496
 do_new_mount fs/namespace.c:2878 [inline]
 path_mount+0x119d/0x1c10 fs/namespace.c:3208
 do_mount fs/namespace.c:3221 [inline]
 __do_sys_mount fs/namespace.c:3429 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3406
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3406
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810ed3f914 of 4 bytes by task 19990 on cpu 0:
 recently_deleted fs/ext4/ialloc.c:702 [inline]
 find_inode_bit+0x227/0x3a0 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xd22/0x3060 fs/ext4/ialloc.c:1062
 ext4_mkdir+0x284/0x730 fs/ext4/namei.c:2793
 vfs_mkdir+0x288/0x350 fs/namei.c:3652
 do_mkdirat+0x132/0x220 fs/namei.c:3675
 __do_sys_mkdir fs/namei.c:3691 [inline]
 __se_sys_mkdir fs/namei.c:3689 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19990 Comm: syz-executor.3 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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