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BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff8881061a1480 of 4 bytes by task 5111 on cpu 0:
 __d_instantiate+0x2d5/0x3c0 fs/dcache.c:1896
 d_instantiate+0x59/0x80 fs/dcache.c:1921
 shmem_symlink+0x365/0x390 mm/shmem.c:4126
 vfs_symlink+0xca/0x1d0 fs/namei.c:4671
 do_symlinkat+0xe1/0x350 fs/namei.c:4697
 __do_sys_symlinkat fs/namei.c:4713 [inline]
 __se_sys_symlinkat fs/namei.c:4710 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4710
 x64_sys_call+0x269e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881061a1480 of 4 bytes by task 5112 on cpu 1:
 __follow_mount_rcu fs/namei.c:1571 [inline]
 handle_mounts fs/namei.c:1622 [inline]
 step_into+0xe3/0x820 fs/namei.c:1952
 walk_component+0x169/0x230 fs/namei.c:2120
 lookup_last fs/namei.c:2612 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2636
 filename_lookup+0x150/0x340 fs/namei.c:2665
 filename_removexattr fs/xattr.c:1047 [inline]
 path_removexattrat+0x132/0x4b0 fs/xattr.c:1088
 __do_sys_lremovexattr fs/xattr.c:1106 [inline]
 __se_sys_lremovexattr fs/xattr.c:1103 [inline]
 __x64_sys_lremovexattr+0x3b/0x50 fs/xattr.c:1103
 x64_sys_call+0x2b6c/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000008 -> 0x00600008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5112 Comm: syz.0.585 Not tainted 6.14.0-rc4-syzkaller-00278-gece144f151ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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