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BUG: KCSAN: data-race in dont_mount / step_into_slowpath

read-write to 0xffff88811b7da540 of 4 bytes by task 6175 on cpu 0:
 dont_mount+0x2a/0x40 include/linux/dcache.h:418
 vfs_unlink+0x202/0x490 fs/namei.c:5661
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5729
 __do_sys_unlink fs/namei.c:5764 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5761
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5761
 x64_sys_call+0x18ee/0x2550 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b7da540 of 4 bytes by task 2985 on cpu 1:
 d_managed include/linux/dcache.h:439 [inline]
 handle_mounts fs/namei.c:1738 [inline]
 step_into_slowpath+0xea/0x4c0 fs/namei.c:2104
 step_into fs/namei.c:2152 [inline]
 walk_component fs/namei.c:2288 [inline]
 lookup_last fs/namei.c:2789 [inline]
 path_lookupat+0x2eb/0x4c0 fs/namei.c:2813
 filename_lookup+0x18f/0x390 fs/namei.c:2842
 do_readlinkat+0x74/0x2f0 fs/stat.c:575
 __do_sys_readlink fs/stat.c:609 [inline]
 __se_sys_readlink fs/stat.c:606 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:606
 x64_sys_call+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300080 -> 0x00004080

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2985 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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