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BUG: KCSAN: data-race in drop_nlink / generic_fillattr

write to 0xffff888102d73608 of 4 bytes by task 12878 on cpu 0:
 drop_nlink+0x37/0x90 fs/inode.c:306
 shmem_unlink+0x1ab/0x1d0 mm/shmem.c:2968
 shmem_rename2+0x2fd/0x440 mm/shmem.c:3064
 vfs_rename+0x811/0xe00 fs/namei.c:4554
 do_renameat2+0x59e/0x9b0 fs/namei.c:4709
 __do_sys_rename fs/namei.c:4758 [inline]
 __se_sys_rename fs/namei.c:4756 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4756
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102d73608 of 4 bytes by task 12873 on cpu 1:
 generic_fillattr+0x76/0x190 fs/stat.c:49
 shmem_getattr+0x231/0x250 mm/shmem.c:1048
 vfs_getattr_nosec+0x141/0x2e0 fs/stat.c:97
 vfs_getattr fs/stat.c:134 [inline]
 vfs_fstat fs/stat.c:156 [inline]
 __do_sys_newfstat fs/stat.c:396 [inline]
 __se_sys_newfstat+0x94/0x2c0 fs/stat.c:393
 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:393
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12873 Comm: systemd-udevd Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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