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BUG: KCSAN: data-race in list_lru_add / list_lru_count_node

write to 0xffff888102aaac68 of 8 bytes by task 1782 on cpu 1:
 list_lru_add+0x26d/0x2c0 mm/list_lru.c:130
 d_lru_add fs/dcache.c:406 [inline]
 retain_dentry+0x226/0x260 fs/dcache.c:660
 dput+0x3d/0x360 fs/dcache.c:883
 path_put fs/namei.c:557 [inline]
 put_link fs/namei.c:1020 [inline]
 walk_component+0x15b/0x350 fs/namei.c:1975
 lookup_last fs/namei.c:2425 [inline]
 path_lookupat+0x12d/0x3d0 fs/namei.c:2449
 __filename_lookup+0x11b/0x300 fs/namei.c:2478
 filename_lookup fs/namei.c:2494 [inline]
 user_path_at_empty+0x3e/0x110 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1773 [inline]
 __do_sys_umount fs/namespace.c:1781 [inline]
 __se_sys_umount fs/namespace.c:1779 [inline]
 __x64_sys_umount+0x75/0xd0 fs/namespace.c:1779
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102aaac68 of 8 bytes by task 15105 on cpu 0:
 list_lru_count_node+0x28/0x30 mm/list_lru.c:195
 list_lru_count include/linux/list_lru.h:132 [inline]
 shrink_dcache_sb+0x1ed/0x2d0 fs/dcache.c:1297
 reconfigure_super+0x2aa/0x4f0 fs/super.c:889
 do_remount fs/namespace.c:2650 [inline]
 path_mount+0x1438/0x1d00 fs/namespace.c:3310
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15105 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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