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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888107c92a90 of 8 bytes by task 14756 on cpu 0:
 __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
 vfs_statx+0xa1/0x2f0 fs/stat.c:312
 vfs_fstatat fs/stat.c:341 [inline]
 vfs_stat include/linux/fs.h:3288 [inline]
 __do_sys_newstat fs/stat.c:478 [inline]
 __se_sys_newstat+0x6d/0x280 fs/stat.c:474
 __x64_sys_newstat+0x31/0x40 fs/stat.c:474
 x64_sys_call+0x5e2/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:5
 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 0xffff888107c92a90 of 8 bytes by task 14755 on cpu 1:
 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
 vfs_statx+0xa1/0x2f0 fs/stat.c:312
 vfs_fstatat fs/stat.c:341 [inline]
 vfs_stat include/linux/fs.h:3288 [inline]
 __do_sys_newstat fs/stat.c:478 [inline]
 __se_sys_newstat+0x6d/0x280 fs/stat.c:474
 __x64_sys_newstat+0x31/0x40 fs/stat.c:474
 x64_sys_call+0x5e2/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:5
 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: 0xffff8882378f8980 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14755 Comm: syz.0.3063 Not tainted 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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