syzbot

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BUG: KCSAN: data-race in list_lru_add / list_lru_count_node

read-write to 0xffff888103f79920 of 8 bytes by task 3104 on cpu 0:
 list_lru_add+0x2a6/0x2d0 mm/list_lru.c:134
 d_lru_add+0xa5/0xe0 fs/dcache.c:431
 retain_dentry+0x157/0x190 fs/dcache.c:685
 dput+0x108/0x1f0 fs/dcache.c:908
 path_umount+0xdc/0x9a0 fs/namespace.c:1899
 ksys_umount fs/namespace.c:1919 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __x64_sys_umount+0xb9/0xe0 fs/namespace.c:1922
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103f79920 of 8 bytes by task 7682 on cpu 1:
 list_lru_count_node+0x2c/0x40 mm/list_lru.c:201
 list_lru_count include/linux/list_lru.h:131 [inline]
 shrink_dcache_sb+0x1bc/0x290 fs/dcache.c:1322
 reconfigure_super+0x3ef/0x580 fs/super.c:1121
 do_remount fs/namespace.c:2884 [inline]
 path_mount+0x969/0xb30 fs/namespace.c:3656
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3863
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7682 Comm: syz-executor.5 Not tainted 6.7.0-rc2-syzkaller-00242-g090472ed9c92 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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