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BUG: KCSAN: data-race in ext4_free_inodes_count / ext4_free_inodes_set

write to 0xffff88810317f00e of 2 bytes by task 1816 on cpu 1:
 ext4_free_inodes_set+0x1b/0x80 fs/ext4/super.c:385
 ext4_free_inode+0x615/0xa30 fs/ext4/ialloc.c:323
 ext4_evict_inode+0xbff/0xf10 fs/ext4/inode.c:332
 evict+0x1aa/0x410 fs/inode.c:590
 iput_final fs/inode.c:1670 [inline]
 iput+0x3ef/0x580 fs/inode.c:1696
 do_unlinkat+0x2d4/0x540 fs/namei.c:4174
 __do_sys_unlink fs/namei.c:4215 [inline]
 __se_sys_unlink fs/namei.c:4213 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4213
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810317f00e of 2 bytes by task 1819 on cpu 0:
 ext4_free_inodes_count+0x18/0x80 fs/ext4/super.c:329
 find_group_orlov+0x7c7/0x840 fs/ext4/ialloc.c:505
 __ext4_new_inode+0x734/0x2fc0 fs/ext4/ialloc.c:1017
 ext4_mkdir+0x28a/0x760 fs/ext4/namei.c:2929
 vfs_mkdir+0x2c8/0x3d0 fs/namei.c:3883
 do_mkdirat+0x12e/0x2c0 fs/namei.c:3909
 __do_sys_mkdir fs/namei.c:3929 [inline]
 __se_sys_mkdir fs/namei.c:3927 [inline]
 __x64_sys_mkdir+0x40/0x50 fs/namei.c:3927
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x1aeb -> 0x1aec

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1819 Comm: syz-executor.2 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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