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BUG: KCSAN: data-race in ext4_free_inodes_count / ext4_free_inodes_set

write to 0xffff888103ed500e of 2 bytes by task 3423 on cpu 1:
 ext4_free_inodes_set+0x1b/0x80 fs/ext4/super.c:403
 ext4_free_inode+0x42d/0x810 fs/ext4/ialloc.c:323
 ext4_evict_inode+0xbd7/0xe40 fs/ext4/inode.c:331
 evict+0x1aa/0x410 fs/inode.c:664
 iput_final fs/inode.c:1744 [inline]
 iput+0x3f9/0x580 fs/inode.c:1770
 d_delete_notify include/linux/fsnotify.h:261 [inline]
 vfs_rmdir+0x270/0x2f0 fs/namei.c:4030
 do_rmdir+0x178/0x300 fs/namei.c:4078
 __do_sys_unlinkat fs/namei.c:4258 [inline]
 __se_sys_unlinkat fs/namei.c:4252 [inline]
 __x64_sys_unlinkat+0xa0/0xb0 fs/namei.c:4252
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103ed500e of 2 bytes by task 16282 on cpu 0:
 ext4_free_inodes_count+0x18/0x80 fs/ext4/super.c:347
 __ext4_new_inode+0xa56/0x2700 fs/ext4/ialloc.c:1042
 ext4_symlink+0x2ba/0x6f0 fs/ext4/namei.c:3293
 vfs_symlink+0x18a/0x280 fs/namei.c:4297
 do_symlinkat+0xe2/0x330 fs/namei.c:4326
 __do_sys_symlinkat fs/namei.c:4343 [inline]
 __se_sys_symlinkat fs/namei.c:4340 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4340
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x1b4f -> 0x1b50

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16282 Comm: syz-executor.4 Not tainted 5.18.0-rc5-syzkaller-00207-g379c72654524 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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