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Open Source and information security mailing list archives
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Date: Mon, 18 Feb 2019 09:57:26 -0800 From: Matthew Wilcox <willy@...radead.org> To: Michal Hocko <mhocko@...nel.org> Cc: Mike Rapoport <rppt@...ux.ibm.com>, Rong Chen <rong.a.chen@...el.com>, Pavel Tatashin <pasha.tatashin@...een.com>, linux-kernel@...r.kernel.org, Linux Memory Management List <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, LKP <lkp@...org>, Oscar Salvador <osalvador@...e.de> Subject: Re: [LKP] efad4e475c [ 40.308255] Oops: 0000 [#1] PREEMPT SMP PTI On Mon, Feb 18, 2019 at 06:05:58PM +0100, Michal Hocko wrote: > + end_pfn = min(start_pfn + nr_pages, > + zone_end_pfn(page_zone(pfn_to_page(start_pfn)))); > > /* Check the starting page of each pageblock within the range */ > - for (; page < end_page; page = next_active_pageblock(page)) { > - if (!is_pageblock_removable_nolock(page)) > + for (; start_pfn < end_pfn; start_pfn = next_active_pageblock(start_pfn)) { > + if (!is_pageblock_removable_nolock(start_pfn)) If you have a zone which contains pfns that run from ULONG_MAX-n to ULONG_MAX, end_pfn is going to wrap around to 0 and this loop won't execute. I think you should use: max_pfn = min(start_pfn + nr_pages, zone_end_pfn(page_zone(pfn_to_page(start_pfn)))) - 1; for (; start_pfn <= max_pfn; ...)
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