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BUG: KCSAN: data-race in dont_mount / step_into

read-write to 0xffff888100494f00 of 4 bytes by task 3593 on cpu 1:
 dont_mount+0x2a/0x40 include/linux/dcache.h:380
 vfs_rename+0x873/0xa30 fs/namei.c:5226
 do_renameat2+0x52a/0x9e0 fs/namei.c:5364
 __do_sys_rename fs/namei.c:5411 [inline]
 __se_sys_rename fs/namei.c:5409 [inline]
 __x64_sys_rename+0x58/0x70 fs/namei.c:5409
 x64_sys_call+0x1f9/0x3000 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888100494f00 of 4 bytes by task 4475 on cpu 0:
 __follow_mount_rcu fs/namei.c:1584 [inline]
 handle_mounts fs/namei.c:1635 [inline]
 step_into+0xe3/0x7f0 fs/namei.c:1989
 open_last_lookups fs/namei.c:3922 [inline]
 path_openat+0x13e8/0x2170 fs/namei.c:4131
 do_filp_open+0x109/0x230 fs/namei.c:4161
 do_sys_openat2+0xa6/0x110 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1463
 x64_sys_call+0x2eab/0x3000 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00200080 -> 0x00004180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4475 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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