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BUG: KCSAN: data-race in ext4_mark_iloc_dirty / find_inode_bit

write to 0xffff888113f38b14 of 4 bytes by task 23788 on cpu 0:
 ext4_do_update_inode fs/ext4/inode.c:5081 [inline]
 ext4_mark_iloc_dirty+0x82f/0x1700 fs/ext4/inode.c:5726
 __ext4_mark_inode_dirty+0x4db/0x5e0 fs/ext4/inode.c:5920
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828
 __ext4_new_inode+0x29ff/0x2fe0 fs/ext4/ialloc.c:1327
 ext4_symlink+0x2d1/0x780 fs/ext4/namei.c:3347
 vfs_symlink+0xbe/0x170 fs/namei.c:4178
 do_symlinkat+0x11e/0x2b0 fs/namei.c:4208
 __do_sys_symlink fs/namei.c:4229 [inline]
 __se_sys_symlink fs/namei.c:4227 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4227
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888113f38b14 of 4 bytes by task 8392 on cpu 1:
 recently_deleted fs/ext4/ialloc.c:702 [inline]
 find_inode_bit+0x227/0x3a0 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xb6c/0x2fe0 fs/ext4/ialloc.c:1063
 ext4_mkdir+0x28a/0x760 fs/ext4/namei.c:2804
 vfs_mkdir+0x135/0x1f0 fs/namei.c:3819
 do_mkdirat+0x147/0x230 fs/namei.c:3844
 __do_sys_mkdir fs/namei.c:3862 [inline]
 __se_sys_mkdir fs/namei.c:3860 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3860
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8392 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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