From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,URIBL_DBL_ABUSE_SPAM,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0F48C31E5B for ; Mon, 17 Jun 2019 21:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A462E2082C for ; Mon, 17 Jun 2019 21:27:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560806876; bh=tWefMRkelchA+e4UgU8lEUCGjI9nt4Jk4KLvr521j5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Db5Z6y2u+veUPgTAx0SDSVfmuu7/Ub4W7mK4I/GcEm9W0/mkAC5bV0C3ziQTdb7Jq YG/b4AFT8rclze/ZM5sNjwl6OhK50bXKvcZrPlhoXmwSZlQMuvMGsKzqmI/NH7Ebrr Awk/Y8Ez9GFaMOvMGCxs9IhppraXBYNBn9RR8ZBY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729629AbfFQV1z (ORCPT ); Mon, 17 Jun 2019 17:27:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:54916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730453AbfFQV1v (ORCPT ); Mon, 17 Jun 2019 17:27:51 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4A19821670; Mon, 17 Jun 2019 21:27:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560806870; bh=tWefMRkelchA+e4UgU8lEUCGjI9nt4Jk4KLvr521j5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ohjm5hFcN0bdj5UgnTGZaB3mspU2Ad8ocRzewInXWP1m6Zj4hGXmRAmljkJNGcadG lqWjNsZ+7859YTf/f8zhJvW+2cUOzm32lTKSXye6kRCIPgckbUH6UnYETzGxpNNeEW 7NFvRqg0UabMntXQG1NBYwEx5lLDc9nfBRoVkKD0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Minchan Kim , Wu Fangsuo , Andrew Morton , Michal Hocko , Pankaj Suryawanshi , Linus Torvalds Subject: [PATCH 4.14 11/53] mm/vmscan.c: fix trying to reclaim unevictable LRU page Date: Mon, 17 Jun 2019 23:09:54 +0200 Message-Id: <20190617210747.339699837@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190617210745.104187490@linuxfoundation.org> References: <20190617210745.104187490@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Minchan Kim commit a58f2cef26e1ca44182c8b22f4f4395e702a5795 upstream. There was the below bug report from Wu Fangsuo. On the CMA allocation path, isolate_migratepages_range() could isolate unevictable LRU pages and reclaim_clean_page_from_list() can try to reclaim them if they are clean file-backed pages. page:ffffffbf02f33b40 count:86 mapcount:84 mapping:ffffffc08fa7a810 index:0x24 flags: 0x19040c(referenced|uptodate|arch_1|mappedtodisk|unevictable|mlocked) raw: 000000000019040c ffffffc08fa7a810 0000000000000024 0000005600000053 raw: ffffffc009b05b20 ffffffc009b05b20 0000000000000000 ffffffc09bf3ee80 page dumped because: VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page)) page->mem_cgroup:ffffffc09bf3ee80 ------------[ cut here ]------------ kernel BUG at /home/build/farmland/adroid9.0/kernel/linux/mm/vmscan.c:1350! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 7125 Comm: syz-executor Tainted: G S 4.14.81 #3 Hardware name: ASR AQUILAC EVB (DT) task: ffffffc00a54cd00 task.stack: ffffffc009b00000 PC is at shrink_page_list+0x1998/0x3240 LR is at shrink_page_list+0x1998/0x3240 pc : [] lr : [] pstate: 60400045 sp : ffffffc009b05940 .. shrink_page_list+0x1998/0x3240 reclaim_clean_pages_from_list+0x3c0/0x4f0 alloc_contig_range+0x3bc/0x650 cma_alloc+0x214/0x668 ion_cma_allocate+0x98/0x1d8 ion_alloc+0x200/0x7e0 ion_ioctl+0x18c/0x378 do_vfs_ioctl+0x17c/0x1780 SyS_ioctl+0xac/0xc0 Wu found it's due to commit ad6b67041a45 ("mm: remove SWAP_MLOCK in ttu"). Before that, unevictable pages go to cull_mlocked so that we can't reach the VM_BUG_ON_PAGE line. To fix the issue, this patch filters out unevictable LRU pages from the reclaim_clean_pages_from_list in CMA. Link: http://lkml.kernel.org/r/20190524071114.74202-1-minchan@kernel.org Fixes: ad6b67041a45 ("mm: remove SWAP_MLOCK in ttu") Signed-off-by: Minchan Kim Reported-by: Wu Fangsuo Debugged-by: Wu Fangsuo Tested-by: Wu Fangsuo Reviewed-by: Andrew Morton Acked-by: Michal Hocko Cc: Pankaj Suryawanshi Cc: [4.12+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1393,7 +1393,7 @@ unsigned long reclaim_clean_pages_from_l list_for_each_entry_safe(page, next, page_list, lru) { if (page_is_file_cache(page) && !PageDirty(page) && - !__PageMovable(page)) { + !__PageMovable(page) && !PageUnevictable(page)) { ClearPageActive(page); list_move(&page->lru, &clean_pages); }