This looks really suspicious, vmscan.c#435:
spin_unlock(&pagemap_lru_lock);
if (put_page_testzero(page))
__free_pages_ok(page, 0);
/* avoid to free a locked page */
page_cache_get(page);
/* whoops, double free coming */
I suggest you bump the page count before releasing the lru lock. The race
shown above may not in fact be possible, but the current code is fragile.
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