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BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff88811db03300 of 4 bytes by task 1269 on cpu 1:
 __d_instantiate+0x2cd/0x3b0 fs/dcache.c:2012
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:2056
 ext4_add_nondir+0x16c/0x190 fs/ext4/namei.c:2800
 ext4_symlink+0x4dc/0x590 fs/ext4/namei.c:3436
 vfs_symlink+0xc2/0x1a0 fs/namei.c:4461
 do_symlinkat+0xe3/0x340 fs/namei.c:4487
 __do_sys_symlinkat fs/namei.c:4503 [inline]
 __se_sys_symlinkat fs/namei.c:4500 [inline]
 __x64_sys_symlinkat+0x62/0x70 fs/namei.c:4500
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88811db03300 of 4 bytes by task 1275 on cpu 0:
 __d_entry_type include/linux/dcache.h:386 [inline]
 d_is_symlink include/linux/dcache.h:416 [inline]
 step_into+0x12f/0x800 fs/namei.c:1845
 walk_component fs/namei.c:2008 [inline]
 link_path_walk+0x4d8/0x7e0 fs/namei.c:2329
 path_openat+0x1a0/0x1d30 fs/namei.c:3775
 do_filp_open+0xf6/0x200 fs/namei.c:3806
 do_sys_openat2+0xab/0x110 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_open fs/open.c:1427 [inline]
 __se_sys_open fs/open.c:1423 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1423
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000 -> 0x00600000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1275 Comm: syz-executor.1 Not tainted 6.7.0-syzkaller-01727-gab27740f7665 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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