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BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit

write to 0xffff888135a9a314 of 4 bytes by task 8445 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_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828
 __ext4_new_inode+0x2a90/0x3060 fs/ext4/ialloc.c:1326
 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

read to 0xffff888135a9a314 of 4 bytes by task 8455 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: 8455 Comm: syz-executor.5 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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