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BUG: KCSAN: data-race in dentry_lru_isolate_shrink / dput

write to 0xffff888050508480 of 4 bytes by task 14966 on cpu 0:
 d_lru_shrink_move fs/dcache.c:453 [inline]
 dentry_lru_isolate_shrink+0x7b/0x100 fs/dcache.c:1240
 __list_lru_walk_one+0xfb/0x320 mm/list_lru.c:222
 list_lru_walk_one mm/list_lru.c:266 [inline]
 list_lru_walk_node+0x63/0x1a0 mm/list_lru.c:295
 list_lru_walk include/linux/list_lru.h:215 [inline]
 shrink_dcache_sb+0x97/0x1c0 fs/dcache.c:1259
 reconfigure_super+0x267/0x4d0 fs/super.c:940
 do_remount fs/namespace.c:2611 [inline]
 do_mount+0x1354/0x1bd0 fs/namespace.c:3190
 __do_sys_mount fs/namespace.c:3409 [inline]
 __se_sys_mount+0xd3/0x100 fs/namespace.c:3386
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3386
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888050508480 of 4 bytes by task 14979 on cpu 1:
 fast_dput fs/dcache.c:746 [inline]
 dput+0x2f/0x420 fs/dcache.c:865
 fsnotify_parent+0x145/0x180 fs/notify/fsnotify.c:173
 fsnotify_file include/linux/fsnotify.h:74 [inline]
 fsnotify_perm+0x1b9/0x250 include/linux/fsnotify.h:103
 security_file_permission+0x87/0xa0 security/security.c:1450
 rw_verify_area+0x12c/0x240 fs/read_write.c:400
 do_splice_to fs/splice.c:862 [inline]
 splice_direct_to_actor+0x23a/0x660 fs/splice.c:950
 do_splice_direct+0xf2/0x170 fs/splice.c:1059
 do_sendfile+0x562/0xb10 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1568
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14979 Comm: syz-executor.1 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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