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BUG: KCSAN: data-race in __d_instantiate / lookup_fast

read-write to 0xffff88810b3aae40 of 4 bytes by task 4722 on cpu 0:
 __d_instantiate+0x2cd/0x3b0 fs/dcache.c:2011
 d_instantiate_new+0x58/0xe0 fs/dcache.c:2055
 ext4_add_nondir+0x15e/0x180 fs/ext4/namei.c:2777
 ext4_symlink+0x4dc/0x590 fs/ext4/namei.c:3411
 vfs_symlink+0x18a/0x280 fs/namei.c:4401
 do_symlinkat+0xdf/0x320 fs/namei.c:4430
 __do_sys_symlinkat fs/namei.c:4447 [inline]
 __se_sys_symlinkat fs/namei.c:4444 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4444
 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+0x63/0xcd

read to 0xffff88810b3aae40 of 4 bytes by task 4721 on cpu 1:
 d_revalidate fs/namei.c:855 [inline]
 lookup_fast+0xca/0x270 fs/namei.c:1634
 open_last_lookups fs/namei.c:3450 [inline]
 path_openat+0x458/0x1b60 fs/namei.c:3711
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_open fs/open.c:1334 [inline]
 __se_sys_open fs/open.c:1330 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1330
 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+0x63/0xcd

value changed: 0x00080000 -> 0x00680040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4721 Comm: syz-executor.5 Not tainted 6.2.0-rc2-syzkaller-00203-g1f5abbd77e2c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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