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BUG: KCSAN: data-race in dont_mount / step_into

read-write to 0xffff8881054d7540 of 4 bytes by task 3503 on cpu 0:
 dont_mount+0x2a/0x40 include/linux/dcache.h:370
 vfs_unlink+0x298/0x430 fs/namei.c:4512
 do_unlinkat+0x236/0x4c0 fs/namei.c:4574
 __do_sys_unlink fs/namei.c:4622 [inline]
 __se_sys_unlink fs/namei.c:4620 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4620
 x64_sys_call+0x280f/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881054d7540 of 4 bytes by task 3017 on cpu 1:
 __follow_mount_rcu fs/namei.c:1552 [inline]
 handle_mounts fs/namei.c:1603 [inline]
 step_into+0xe7/0x810 fs/namei.c:1932
 walk_component+0x169/0x230 fs/namei.c:2100
 lookup_last fs/namei.c:2597 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2621
 filename_lookup+0x127/0x300 fs/namei.c:2650
 do_readlinkat+0x89/0x210 fs/stat.c:579
 __do_sys_readlink fs/stat.c:616 [inline]
 __se_sys_readlink fs/stat.c:613 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:613
 x64_sys_call+0x13c3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00600008 -> 0x00008008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3017 Comm: udevd Not tainted 6.12.0-syzkaller-00171-g23acd177540d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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