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BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff888107ac90c0 of 4 bytes by task 13092 on cpu 1:
 __d_instantiate+0x2cd/0x3c0 fs/dcache.c:1855
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:1899
 ext4_add_nondir+0x16c/0x1a0 fs/ext4/namei.c:2797
 ext4_symlink+0x4dd/0x5a0 fs/ext4/namei.c:3433
 vfs_symlink+0xca/0x1b0 fs/namei.c:4484
 do_symlinkat+0xe3/0x350 fs/namei.c:4510
 __do_sys_symlink fs/namei.c:4531 [inline]
 __se_sys_symlink fs/namei.c:4529 [inline]
 __x64_sys_symlink+0x56/0x70 fs/namei.c:4529
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888107ac90c0 of 4 bytes by task 13096 on cpu 0:
 __follow_mount_rcu fs/namei.c:1485 [inline]
 handle_mounts fs/namei.c:1536 [inline]
 step_into+0xe7/0x810 fs/namei.c:1842
 walk_component+0x169/0x230 fs/namei.c:2010
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2485
 filename_lookup+0x127/0x300 fs/namei.c:2514
 user_path_at_empty+0x42/0x120 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr fs/xattr.c:861 [inline]
 __do_sys_llistxattr fs/xattr.c:882 [inline]
 __se_sys_llistxattr fs/xattr.c:879 [inline]
 __x64_sys_llistxattr+0x76/0x130 fs/xattr.c:879
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x00080000 -> 0x00680040

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13096 Comm: syz-executor.0 Tainted: G        W          6.9.0-rc1-syzkaller-00178-g317c7bc0ef03 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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