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BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff88810611bc00 of 4 bytes by task 24003 on cpu 0:
 __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_mknod+0x210/0x2f0 fs/ext4/namei.c:2872
 vfs_mknod+0x2d4/0x310 fs/namei.c:4001
 unix_bind_bsd net/unix/af_unix.c:1228 [inline]
 unix_bind+0x312/0x8a0 net/unix/af_unix.c:1319
 __sys_bind+0x15b/0x1d0 net/socket.c:1847
 __do_sys_bind net/socket.c:1858 [inline]
 __se_sys_bind net/socket.c:1856 [inline]
 __x64_sys_bind+0x41/0x50 net/socket.c:1856
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff88810611bc00 of 4 bytes by task 24004 on cpu 1:
 __d_entry_type include/linux/dcache.h:397 [inline]
 d_is_symlink include/linux/dcache.h:427 [inline]
 step_into+0x12f/0x810 fs/namei.c:1847
 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
 kern_path+0x39/0x110 fs/namei.c:2622
 unix_find_bsd net/unix/af_unix.c:1064 [inline]
 unix_find_other+0x88/0x550 net/unix/af_unix.c:1125
 unix_stream_connect+0x1e3/0x9d0 net/unix/af_unix.c:1514
 __sys_connect_file net/socket.c:2048 [inline]
 __sys_connect+0x1a9/0x1c0 net/socket.c:2065
 __do_sys_connect net/socket.c:2075 [inline]
 __se_sys_connect net/socket.c:2072 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2072
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x00000000 -> 0x00500000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24004 Comm: syz-executor.0 Tainted: G        W          6.8.0-syzkaller-05562-g61387b8dcf1d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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