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BUG: KCSAN: data-race in d_set_mounted / dput

write to 0xffff88810dae80c0 of 4 bytes by task 9814 on cpu 0:
 d_set_mounted+0x112/0x190 fs/dcache.c:1466
 get_mountpoint+0x1ac/0x2f0 fs/namespace.c:740
 lock_mount+0x86/0x1d0 fs/namespace.c:2206
 do_new_mount_fc fs/namespace.c:2824 [inline]
 do_new_mount fs/namespace.c:2883 [inline]
 path_mount+0x188e/0x1c10 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3409
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3409
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810dae80c0 of 4 bytes by task 9819 on cpu 1:
 fast_dput fs/dcache.c:746 [inline]
 dput+0x2f/0x420 fs/dcache.c:872
 path_put fs/namei.c:496 [inline]
 done_path_create fs/namei.c:3520 [inline]
 do_mkdirat+0x170/0x220 fs/namei.c:3676
 __do_sys_mkdir fs/namei.c:3691 [inline]
 __se_sys_mkdir fs/namei.c:3689 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3689
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9819 Comm: syz-executor.0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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