syzbot

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BUG: KCSAN: data-race in list_lru_add / list_lru_count_node

write to 0xffff888102b675a8 of 8 bytes by task 1836 on cpu 0:
 list_lru_add+0x251/0x280 mm/list_lru.c:136
 d_lru_add fs/dcache.c:406 [inline]
 retain_dentry+0x226/0x260 fs/dcache.c:660
 dput+0x11e/0x430 fs/dcache.c:883
 path_umount+0xde/0xa70 fs/namespace.c:1762
 ksys_umount fs/namespace.c:1782 [inline]
 __do_sys_umount fs/namespace.c:1787 [inline]
 __se_sys_umount fs/namespace.c:1785 [inline]
 __x64_sys_umount+0xb5/0xe0 fs/namespace.c:1785
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102b675a8 of 8 bytes by task 15707 on cpu 1:
 list_lru_count_node+0x28/0x30 mm/list_lru.c:204
 list_lru_count include/linux/list_lru.h:132 [inline]
 shrink_dcache_sb+0x1ed/0x2d0 fs/dcache.c:1297
 reconfigure_super+0x146/0x540 fs/super.c:891
 do_remount fs/namespace.c:2656 [inline]
 path_mount+0x13f9/0x1c40 fs/namespace.c:3316
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3522
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15707 Comm: syz-executor.4 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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EXT4-fs (sda1): re-mounted. Quota mode: writeback.