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BUG: KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new

write to 0xffff8880b6cfd7c0 of 8 bytes by task 9109 on cpu 0:
 d_instantiate_new+0x99/0xe0 fs/dcache.c:1996
 ext4_mkdir+0xa5a/0xc00 fs/ext4/namei.c:2825
 vfs_mkdir+0x288/0x370 fs/namei.c:3641
 do_mkdirat+0x132/0x220 fs/namei.c:3664
 __do_sys_mkdir fs/namei.c:3680 [inline]
 __se_sys_mkdir fs/namei.c:3678 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3678
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b6cfd7c0 of 8 bytes by task 9260 on cpu 1:
 __ext4_update_other_inode_time+0x45/0x570 fs/ext4/inode.c:4893
 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5068 [inline]
 ext4_mark_iloc_dirty+0x1266/0x1630 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x2b9/0x3f0 fs/ext4/inode.c:5818
 ext4_rmdir+0x89a/0x920 fs/ext4/namei.c:3160
 vfs_rmdir+0x132/0x2b0 fs/namei.c:3704
 do_rmdir+0x170/0x320 fs/namei.c:3766
 __do_sys_rmdir fs/namei.c:3784 [inline]
 __se_sys_rmdir fs/namei.c:3782 [inline]
 __x64_sys_rmdir+0x20/0x30 fs/namei.c:3782
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9260 Comm: syz-executor.5 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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