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BUG: KCSAN: data-race in dont_mount / step_into_slowpath

read-write to 0xffff888107b89cc0 of 4 bytes by task 3290 on cpu 1:
 dont_mount+0x2a/0x40 include/linux/dcache.h:395
 vfs_unlink+0x206/0x490 fs/namei.c:5500
 filename_unlinkat+0x1e2/0x410 fs/namei.c:5568
 __do_sys_unlink fs/namei.c:5603 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5600
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5600
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107b89cc0 of 4 bytes by task 2982 on cpu 0:
 __d_entry_type include/linux/dcache.h:429 [inline]
 d_is_symlink include/linux/dcache.h:459 [inline]
 step_into_slowpath+0x139/0x4c0 fs/namei.c:2104
 step_into fs/namei.c:2148 [inline]
 walk_component fs/namei.c:2284 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x330/0x500 fs/namei.c:2809
 filename_lookup+0x190/0x390 fs/namei.c:2838
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x2b51/0x3020 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2982 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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