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BUG: KCSAN: data-race in d_invalidate / fast_dput

write to 0xffff888106a45550 of 8 bytes by task 11216 on cpu 1:
 __d_drop fs/dcache.c:521 [inline]
 d_invalidate+0x5c/0x1c0 fs/dcache.c:1597
 proc_invalidate_siblings_dcache+0x209/0x2b0 fs/proc/inode.c:148
 proc_sys_invalidate_dcache fs/proc/proc_sysctl.c:285 [inline]
 start_unregistering fs/proc/proc_sysctl.c:310 [inline]
 drop_sysctl_table+0xbb/0x260 fs/proc/proc_sysctl.c:1506
 unregister_sysctl_table+0x30/0x50 fs/proc/proc_sysctl.c:1531
 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:177
 __devinet_sysctl_unregister net/ipv4/devinet.c:2633 [inline]
 devinet_sysctl_unregister net/ipv4/devinet.c:2661 [inline]
 inetdev_destroy net/ipv4/devinet.c:345 [inline]
 inetdev_event+0x614/0xad0 net/ipv4/devinet.c:1643
 notifier_call_chain kernel/notifier.c:93 [inline]
 raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:461
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 unregister_netdevice_many_notify+0x8b7/0x11b0 net/core/dev.c:11403
 unregister_netdevice_many net/core/dev.c:11465 [inline]
 unregister_netdevice_queue+0x1f4/0x220 net/core/dev.c:11339
 unregister_netdevice include/linux/netdevice.h:3118 [inline]
 ser_release+0x118/0x180 drivers/net/caif/caif_serial.c:310
 ldisc_open+0x9d/0x510 drivers/net/caif/caif_serial.c:333
 tty_ldisc_open drivers/tty/tty_ldisc.c:432 [inline]
 tty_ldisc_reinit+0x21a/0x320 drivers/tty/tty_ldisc.c:667
 tty_reopen+0x188/0x1b0 drivers/tty/tty_io.c:1360
 tty_open_by_driver drivers/tty/tty_io.c:2076 [inline]
 tty_open+0x8ff/0xb00 drivers/tty/tty_io.c:2129
 chrdev_open+0x2f9/0x370 fs/char_dev.c:414
 do_dentry_open+0x621/0xa20 fs/open.c:958
 vfs_open+0x38/0x1f0 fs/open.c:1088
 do_open fs/namei.c:3774 [inline]
 path_openat+0x1ac2/0x1fa0 fs/namei.c:3933
 do_filp_open+0xf7/0x200 fs/namei.c:3960
 do_sys_openat2+0xab/0x120 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1441
 x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258
 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 0xffff888106a45550 of 8 bytes by task 3008 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:698 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:794
 dput+0x24/0xd0 fs/dcache.c:851
 __fput+0x3fb/0x6d0 fs/file_table.c:439
 __fput_sync+0x43/0x60 fs/file_table.c:516
 __do_sys_close fs/open.c:1567 [inline]
 __se_sys_close+0xf9/0x1a0 fs/open.c:1552
 __x64_sys_close+0x1f/0x30 fs/open.c:1552
 x64_sys_call+0x25cb/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:4
 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: 0xffff888237ba2010 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3008 Comm: dhcpcd Not tainted 6.12.0-rc4-syzkaller-00045-gd12937763990 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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