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BUG: KCSAN: data-race in iput / other_inode_match

write to 0xffff8881290f25f8 of 8 bytes by task 32233 on cpu 0:
 iput_final fs/inode.c:1566 [inline]
 iput+0x2e6/0x4d0 fs/inode.c:1597
 dentry_unlink_inode+0x272/0x2e0 fs/dcache.c:374
 d_delete fs/dcache.c:2451 [inline]
 d_delete+0xca/0xe0 fs/dcache.c:2440
 vfs_rmdir fs/namei.c:3966 [inline]
 vfs_rmdir+0x2d3/0x2f0 fs/namei.c:3931
 do_rmdir+0x2e9/0x320 fs/namei.c:4014
 __do_sys_rmdir fs/namei.c:4032 [inline]
 __se_sys_rmdir fs/namei.c:4030 [inline]
 __x64_sys_rmdir+0x2c/0x40 fs/namei.c:4030
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881290f25f8 of 8 bytes by task 7759 on cpu 1:
 other_inode_match+0x6a/0x570 fs/ext4/inode.c:4849
 find_inode_nowait+0x12f/0x160 fs/inode.c:1445
 ext4_update_other_inodes_time fs/ext4/inode.c:4897 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5023 [inline]
 ext4_mark_iloc_dirty+0x123c/0x1500 fs/ext4/inode.c:5578
 ext4_mark_inode_dirty+0xe6/0x420 fs/ext4/inode.c:5771
 ext4_mkdir+0x56e/0x820 fs/ext4/namei.c:2810
 vfs_mkdir+0x281/0x390 fs/namei.c:3889
 do_mkdirat+0x1b5/0x200 fs/namei.c:3912
 __do_sys_mkdir fs/namei.c:3928 [inline]
 __se_sys_mkdir fs/namei.c:3926 [inline]
 __x64_sys_mkdir+0x3d/0x50 fs/namei.c:3926
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7759 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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