syzbot

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BUG: KCSAN: data-race in shrink_dentry_list / step_into

read-write to 0xffff8881006c8a80 of 4 bytes by task 5152 on cpu 0:
 d_shrink_del fs/dcache.c:449 [inline]
 shrink_dentry_list+0x19f/0x3d0 fs/dcache.c:1074
 shrink_dcache_sb+0x165/0x290 fs/dcache.c:1195
 reconfigure_super+0x3ef/0x580 fs/super.c:1054
 do_remount fs/namespace.c:2892 [inline]
 path_mount+0x969/0xb30 fs/namespace.c:3671
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3875
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881006c8a80 of 4 bytes by task 5153 on cpu 1:
 __follow_mount_rcu fs/namei.c:1486 [inline]
 handle_mounts fs/namei.c:1537 [inline]
 step_into+0xe7/0x800 fs/namei.c:1839
 walk_component fs/namei.c:2007 [inline]
 link_path_walk+0x4d8/0x7e0 fs/namei.c:2328
 path_lookupat+0x72/0x2a0 fs/namei.c:2481
 filename_lookup+0x126/0x300 fs/namei.c:2511
 vfs_statx+0xa2/0x320 fs/stat.c:244
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00680440 -> 0x00008040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5153 Comm: modprobe Not tainted 6.8.0-rc1-syzkaller-00331-gcd2286fc5775 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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