==================================================================
BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff8881004a4310 of 8 bytes by task 4451 on cpu 1:
 __d_drop fs/dcache.c:516 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:608
 dput+0x5c/0xd0 fs/dcache.c:852
 handle_mounts fs/namei.c:1579 [inline]
 step_into+0x21a/0x810 fs/namei.c:1877
 walk_component+0x169/0x230 fs/namei.c:2045
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2566
 filename_lookup+0x127/0x300 fs/namei.c:2595
 user_path_at+0x3c/0x110 fs/namei.c:3002
 path_setxattr+0x179/0x360 fs/xattr.c:653
 __do_sys_lsetxattr fs/xattr.c:683 [inline]
 __se_sys_lsetxattr fs/xattr.c:679 [inline]
 __x64_sys_lsetxattr+0x6a/0x80 fs/xattr.c:679
 x64_sys_call+0x2931/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:190
 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 0xffff8881004a4310 of 8 bytes by task 4452 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:354 [inline]
 retain_dentry fs/dcache.c:693 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:789
 dput+0x24/0xd0 fs/dcache.c:846
 handle_mounts fs/namei.c:1579 [inline]
 step_into+0x21a/0x810 fs/namei.c:1877
 walk_component+0x169/0x230 fs/namei.c:2045
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2566
 filename_lookup+0x127/0x300 fs/namei.c:2595
 user_path_at+0x3c/0x110 fs/namei.c:3002
 path_removexattr+0xc5/0x290 fs/xattr.c:923
 __do_sys_lremovexattr fs/xattr.c:948 [inline]
 __se_sys_lremovexattr fs/xattr.c:945 [inline]
 __x64_sys_lremovexattr+0x33/0x40 fs/xattr.c:945
 x64_sys_call+0x1bbe/0x2d60 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: 0xffff888237458c50 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4452 Comm: syz.3.229 Not tainted 6.11.0-rc4-syzkaller-00033-g872cf28b8df9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================