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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

write to 0xffff88815c6cbd80 of 4 bytes by task 26484 on cpu 0:
 d_lru_del fs/dcache.c:437 [inline]
 __dentry_kill+0xb4/0x450 fs/dcache.c:599
 dentry_kill+0x8d/0x1e0
 dput+0x11e/0x1f0 fs/dcache.c:913
 lookup_fast+0x230/0x270 fs/namei.c:1651
 walk_component+0x3f/0x230 fs/namei.c:1989
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x11d/0x2b0 fs/namei.c:2474
 filename_lookup+0x133/0x310 fs/namei.c:2503
 user_path_at_empty+0x3e/0x110 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 path_setxattr+0x88/0x370 fs/xattr.c:637
 __do_sys_setxattr fs/xattr.c:658 [inline]
 __se_sys_setxattr fs/xattr.c:654 [inline]
 __x64_sys_setxattr+0x69/0x80 fs/xattr.c:654
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88815c6cbd80 of 4 bytes by task 26483 on cpu 1:
 d_revalidate fs/namei.c:855 [inline]
 lookup_fast+0xca/0x270 fs/namei.c:1634
 walk_component+0x3f/0x230 fs/namei.c:1989
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x11d/0x2b0 fs/namei.c:2474
 filename_lookup+0x133/0x310 fs/namei.c:2503
 user_path_at_empty+0x3e/0x110 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 __do_sys_chdir fs/open.c:514 [inline]
 __se_sys_chdir+0x56/0x150 fs/open.c:508
 __x64_sys_chdir+0x1b/0x20 fs/open.c:508
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00080047 -> 0x00008047

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26483 Comm: syz-executor.1 Not tainted 6.0.0-rc7-syzkaller-00180-g70575e77839f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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