syzbot

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BUG: KCSAN: data-race in dentry_lru_isolate_shrink / step_into

write to 0xffff8881005be840 of 4 bytes by task 25183 on cpu 1:
 d_lru_shrink_move fs/dcache.c:480 [inline]
 dentry_lru_isolate_shrink+0x7f/0x100 fs/dcache.c:1300
 __list_lru_walk_one+0x180/0x3b0 mm/list_lru.c:231
 list_lru_walk_node+0x14d/0x1f0 mm/list_lru.c:316
 list_lru_walk include/linux/list_lru.h:214 [inline]
 shrink_dcache_sb+0xc5/0x290 fs/dcache.c:1319
 reconfigure_super+0x3ef/0x580 fs/super.c:1118
 do_remount fs/namespace.c:2882 [inline]
 path_mount+0x969/0xb30 fs/namespace.c:3654
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3861
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881005be840 of 4 bytes by task 25182 on cpu 0:
 __follow_mount_rcu fs/namei.c:1486 [inline]
 handle_mounts fs/namei.c:1537 [inline]
 step_into+0xe7/0x800 fs/namei.c:1839
 open_last_lookups fs/namei.c:3586 [inline]
 path_openat+0x10bb/0x1d10 fs/namei.c:3793
 do_filp_open+0xf6/0x200 fs/namei.c:3823
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_open fs/open.c:1445 [inline]
 __se_sys_open fs/open.c:1441 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00080000 -> 0x00008000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25182 Comm: syz-executor.4 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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