==================================================================
BUG: KCSAN: data-race in dont_mount / step_into_slowpath

read-write to 0xffff8881087ae6c0 of 4 bytes by task 8194 on cpu 0:
 dont_mount+0x2a/0x40 include/linux/dcache.h:395
 vfs_rename+0xa05/0xad0 fs/namei.c:6074
 filename_renameat2+0x3b6/0x6e0 fs/namei.c:6182
 __do_sys_rename fs/namei.c:6226 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6222
 __x64_sys_rename+0x31/0x40 fs/namei.c:6222
 x64_sys_call+0x2b3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:83
 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 0xffff8881087ae6c0 of 4 bytes by task 8211 on cpu 1:
 __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_utimes_path fs/utimes.c:96 [inline]
 do_utimes+0xd2/0x210 fs/utimes.c:139
 __do_sys_utimensat fs/utimes.c:158 [inline]
 __se_sys_utimensat fs/utimes.c:142 [inline]
 __x64_sys_utimensat+0xc4/0x190 fs/utimes.c:142
 x64_sys_call+0x2bca/0x3020 arch/x86/include/generated/asm/syscalls_64.h:281
 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 -> 0x00004180

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8211 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
==================================================================