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BUG: KCSAN: data-race in dentry_kill / fast_dput

write to 0xffff888105d8f610 of 8 bytes by task 4831 on cpu 0:
 __d_drop fs/dcache.c:578 [inline]
 dentry_kill+0x139/0x500 fs/dcache.c:824
 finish_dput+0x16/0x1d0 fs/dcache.c:1001
 dput+0x48/0x50 fs/dcache.c:1042
 lookup_open+0xcc0/0x10d0 fs/namei.c:4597
 open_last_lookups fs/namei.c:4767 [inline]
 path_openat+0x415/0x10d0 fs/namei.c:4997
 do_file_open+0x16c/0x290 fs/namei.c:5029
 do_sys_openat2+0xa0/0x130 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1434
 x64_sys_call+0x1f72/0x2550 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888105d8f610 of 8 bytes by task 4828 on cpu 1:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:396 [inline]
 retain_dentry fs/dcache.c:872 [inline]
 fast_dput+0x64/0x300 fs/dcache.c:971
 dput+0x1f/0x50 fs/dcache.c:1040
 end_dirop fs/namei.c:2956 [inline]
 end_creating include/linux/namei.h:120 [inline]
 end_creating_path fs/namei.c:5132 [inline]
 filename_symlinkat+0x11f/0x2b0 fs/namei.c:5821
 __do_sys_symlinkat fs/namei.c:5839 [inline]
 __se_sys_symlinkat+0x43/0x1b0 fs/namei.c:5834
 __x64_sys_symlinkat+0x43/0x50 fs/namei.c:5834
 x64_sys_call+0x1cf4/0x2550 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888237598cb0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4828 Comm: syz.0.481 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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