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BUG: KCSAN: data-race in dont_mount / step_into

read-write to 0xffff8881067e5cc0 of 4 bytes by task 24685 on cpu 1:
 dont_mount+0x2a/0x40 include/linux/dcache.h:382
 vfs_unlink+0x298/0x430 fs/namei.c:4527
 do_unlinkat+0x237/0x4d0 fs/namei.c:4589
 __do_sys_unlink fs/namei.c:4637 [inline]
 __se_sys_unlink fs/namei.c:4635 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4635
 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 0xffff8881067e5cc0 of 4 bytes by task 3002 on cpu 0:
 __d_entry_type include/linux/dcache.h:416 [inline]
 d_is_symlink include/linux/dcache.h:446 [inline]
 step_into+0x129/0x820 fs/namei.c:1957
 walk_component+0x169/0x230 fs/namei.c:2120
 lookup_last fs/namei.c:2612 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2636
 filename_lookup+0x150/0x340 fs/namei.c:2665
 do_readlinkat+0x89/0x210 fs/stat.c:564
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 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 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3002 Comm: udevd Not tainted 6.14.0-rc2-syzkaller-00034-gfebbc555cf0f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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