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BUG: KCSAN: data-race in __d_instantiate / step_into

write to 0xffff888106a02e70 of 8 bytes by task 3878 on cpu 1:
 __d_set_inode_and_type fs/dcache.c:406 [inline]
 __d_instantiate+0x1f8/0x3b0 fs/dcache.c:1920
 d_instantiate+0x59/0x80 fs/dcache.c:1947
 shmem_symlink+0x3a7/0x3d0 mm/shmem.c:4132
 vfs_symlink+0xd4/0x1e0 fs/namei.c:4730
 do_symlinkat+0xc7/0x3c0 fs/namei.c:4756
 __do_sys_symlinkat fs/namei.c:4772 [inline]
 __se_sys_symlinkat fs/namei.c:4769 [inline]
 __x64_sys_symlinkat+0x5a/0x70 fs/namei.c:4769
 x64_sys_call+0x1558/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106a02e70 of 8 bytes by task 3879 on cpu 0:
 step_into+0x122/0x820 fs/namei.c:1980
 walk_component+0x162/0x220 fs/namei.c:2144
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2663
 filename_lookup+0x147/0x340 fs/namei.c:2692
 filename_removexattr fs/xattr.c:1047 [inline]
 path_removexattrat+0x148/0x570 fs/xattr.c:1088
 __do_sys_removexattr fs/xattr.c:1100 [inline]
 __se_sys_removexattr fs/xattr.c:1097 [inline]
 __x64_sys_removexattr+0x38/0x50 fs/xattr.c:1097
 x64_sys_call+0x2c7a/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:198
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff8881051431e8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3879 Comm: syz.3.140 Not tainted 6.15.0-syzkaller-11121-gfe4281644c62 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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