[ADMIN] Would like to below scenario is possible for getting page/block corruption

Hi ,

I am working on page corruption issue want to know if below scenario is possible 

1)  Insert command from client , I understand heap_insert is called from heampam.c

2) Let us say table is full and relation is extended and added a new block 

3) Tuple is inserted into new page for the block RelationPutHeapTuple/hio.c

4) Later  WAL record is inserted  through recptr = XLogInsert(RM_HEAP_ID, info);

5) Then backend update the PageHeader with WAL LSN details  PageSetLSN(page, recptr);

If my server got crashed after step 4) is there a possibility that after postgres database restart I get  below error when I access the relation or vacuum is run on this relation or taking backup through pg_dump  ?

or 

Postgres can automatically recover the page  without throwing any error ?

Appreciate your valuable response on this