syzbot

==================================================================
BUG: KCSAN: data-race in d_delete / step_into

write to 0xffff88811e1d3d80 of 4 bytes by task 14018 on cpu 0:
 d_delete+0x6e/0xa0 fs/dcache.c:2469
 vfs_unlink+0x3a7/0x3d0 fs/namei.c:3839
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3889
 __do_sys_unlink fs/namei.c:3936 [inline]
 __se_sys_unlink fs/namei.c:3934 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811e1d3d80 of 4 bytes by task 5034 on cpu 1:
 __follow_mount_rcu fs/namei.c:1316 [inline]
 handle_mounts fs/namei.c:1373 [inline]
 step_into+0xec/0xe70 fs/namei.c:1690
 walk_component+0x190/0x350 fs/namei.c:1866
 lookup_last fs/namei.c:2309 [inline]
 path_lookupat+0x12d/0x560 fs/namei.c:2333
 filename_lookup+0xf2/0x380 fs/namei.c:2366
 user_path_at_empty+0x3b/0x50 fs/namei.c:2646
 do_readlinkat+0x87/0x200 fs/stat.c:419
 __do_sys_readlink fs/stat.c:452 [inline]
 __se_sys_readlink fs/stat.c:449 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:449
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5034 Comm: systemd-udevd Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================