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BUG: KCSAN: data-race in ___d_drop / __d_lookup

write to 0xffff888106cbf0d0 of 8 bytes by task 25034 on cpu 1:
 __hlist_bl_del include/linux/list_bl.h:128 [inline]
 ___d_drop+0x106/0x220 fs/dcache.c:500
 __d_drop fs/dcache.c:507 [inline]
 d_invalidate+0x51/0x1c0 fs/dcache.c:1729
 proc_invalidate_siblings_dcache+0x1db/0x2b0 fs/proc/inode.c:145
 proc_sys_invalidate_dcache fs/proc/proc_sysctl.c:283 [inline]
 start_unregistering fs/proc/proc_sysctl.c:308 [inline]
 drop_sysctl_table+0xbb/0x280 fs/proc/proc_sysctl.c:1504
 drop_sysctl_table+0x1ef/0x280 fs/proc/proc_sysctl.c:1511
 unregister_sysctl_table+0x30/0x50 fs/proc/proc_sysctl.c:1529
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:185
 xfrm6_net_sysctl_exit net/ipv6/xfrm6_policy.c:227 [inline]
 xfrm6_net_exit+0x3e/0x80 net/ipv6/xfrm6_policy.c:261
 ops_exit_list net/core/net_namespace.c:170 [inline]
 cleanup_net+0x3cb/0x770 net/core/net_namespace.c:614
 process_one_work kernel/workqueue.c:2627 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700
 worker_thread+0x525/0x730 kernel/workqueue.c:2781
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

read to 0xffff888106cbf0d0 of 8 bytes by task 2817 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:336 [inline]
 __d_lookup+0x10e/0x380 fs/dcache.c:2490
 lookup_fast+0x4c/0x290 fs/namei.c:1652
 walk_component fs/namei.c:1998 [inline]
 link_path_walk+0x3f4/0x7e0 fs/namei.c:2329
 path_openat+0x1a0/0x1d70 fs/namei.c:3775
 do_filp_open+0xf6/0x200 fs/namei.c:3809
 do_sys_openat2+0xab/0x110 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0xffff888106de79c8 -> 0xffff888106d5e308

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2817 Comm: dhcpcd Not tainted 6.7.0-rc6-syzkaller-00078-ga4aebe936554 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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