[Bug 204371] BUG kmalloc-4k (Tainted: G W ): Object padding overwritten

https://bugzilla.kernel.org/show_bug.cgi?id=204371

--- Comment #24 from Christophe Leroy (christophe.leroy@c-s.fr) ---

It confirms what I suspected: due to some debug options, kzalloc() doesn't
provide aligned areas.

In __load_free_space_cache() can you replace 
e->bitmap = kzalloc(PAGE_SIZE, GFP_NOFS);
By
e->bitmap = (void *)__get_free_page(GFP_NOFS | __GFP_ZERO);

And same in insert_into_bitmap()

Then replace the three kfree() which free bitmaps by something like
free_page((unsigned long)entry->bitmap)

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