On Mon, Dec 08, 2014 at 10:07:55AM -0800, Linus Torvalds wrote: > Which is in the vmalloc address space. So somebody used a vmalloc'ed > address and tried to convert it to a physical address in order to look > up the page. > > Which is not a valid operation, and the BUG_ON() is definitely proper. > > Now *why* something tried to do a virt_to_page() on a vmalloc'ed > address, that I leave to others.
iov_iter_get_pages() in ITER_KVEC case, trying to avoid get_user_pages_fast() and getting it wrong. FWIW, the reproducer is finit_module(fd, ....) where fd has been opened with O_DIRECT. In that case we get kernel_read() on O_DIRECT and the buffer has just been vmalloc'ed. What's the sane way to grab struct page * for a vmalloc'ed address? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
