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BUG: KCSAN: data-race in dont_mount / step_into

read-write to 0xffff888106635840 of 4 bytes by task 3393 on cpu 0:
 dont_mount+0x2a/0x40 include/linux/dcache.h:370
 vfs_unlink+0x298/0x430 fs/namei.c:4525
 do_unlinkat+0x237/0x4d0 fs/namei.c:4587
 __do_sys_unlink fs/namei.c:4635 [inline]
 __se_sys_unlink fs/namei.c:4633 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4633
 x64_sys_call+0x2329/0x2dc0 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 0xffff888106635840 of 4 bytes by task 3020 on cpu 1:
 __d_entry_type include/linux/dcache.h:404 [inline]
 d_is_symlink include/linux/dcache.h:434 [inline]
 step_into+0x12f/0x840 fs/namei.c:1955
 walk_component+0x169/0x230 fs/namei.c:2118
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2634
 filename_lookup+0x150/0x340 fs/namei.c:2663
 do_readlinkat+0x89/0x210 fs/stat.c:562
 __do_sys_readlink fs/stat.c:599 [inline]
 __se_sys_readlink fs/stat.c:596 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:596
 x64_sys_call+0x28ba/0x2dc0 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: 3020 Comm: udevd Tainted: G        W          6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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