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=-6.8 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,USER_AGENT_GIT autolearn=unavailable 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 335E2C43331 for ; Tue, 24 Mar 2020 13:31:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07CE0206F6 for ; Tue, 24 Mar 2020 13:31:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585056692; bh=cvGcIc2c7FEbl/5gIogoRTLaX9Jd2iA3AwynJj81h5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lAb8+Hgl8CInwFAa1A4P+mcAXS4oLvhFTNjlDEetJ6MMGDPBJjZR8BHdtiLU2fiqy 4i4bup7Bnd5f7VP058tIwfz1+2RhDBn9Jef6/5Pfr6bw3CrITdkdgGdqsFTQzxg/xQ +XVGetzvLrlRXs0biVntLIa5OhPY9mC7sI0PqYZ8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728535AbgCXNT4 (ORCPT ); Tue, 24 Mar 2020 09:19:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:40810 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728871AbgCXNTx (ORCPT ); Tue, 24 Mar 2020 09:19:53 -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 2B58D20870; Tue, 24 Mar 2020 13:19:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585055992; bh=cvGcIc2c7FEbl/5gIogoRTLaX9Jd2iA3AwynJj81h5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eVDxCchVAExufYKo118WBKAgEBZUY1KeO4UOIEVir+DvQ8lNRwPCZnyqaOI/IQ+TW 5WoMeU1D7XHbkRiooGsRCF168QZx7gTReEC5nLi8KjIYJhl1InNpQCa70P/ezs/drS 2hyFonaLCvosJlggnn13PCZ0AzYVjvGARwk1Svfo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Qian Cai , Andrew Morton , David Hildenbrand , "Huang, Ying" , Rafael Aquini , Linus Torvalds Subject: [PATCH 5.4 092/102] page-flags: fix a crash at SetPageError(THP_SWAP) Date: Tue, 24 Mar 2020 14:11:24 +0100 Message-Id: <20200324130816.171850987@linuxfoundation.org> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200324130806.544601211@linuxfoundation.org> References: <20200324130806.544601211@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: Qian Cai commit d72520ad004a8ce18a6ba6cde317f0081b27365a upstream. Commit bd4c82c22c36 ("mm, THP, swap: delay splitting THP after swapped out") supported writing THP to a swap device but forgot to upgrade an older commit df8c94d13c7e ("page-flags: define behavior of FS/IO-related flags on compound pages") which could trigger a crash during THP swapping out with DEBUG_VM_PGFLAGS=y, kernel BUG at include/linux/page-flags.h:317! page dumped because: VM_BUG_ON_PAGE(1 && PageCompound(page)) page:fffff3b2ec3a8000 refcount:512 mapcount:0 mapping:000000009eb0338c index:0x7f6e58200 head:fffff3b2ec3a8000 order:9 compound_mapcount:0 compound_pincount:0 anon flags: 0x45fffe0000d8454(uptodate|lru|workingset|owner_priv_1|writeback|head|reclaim|swapbacked) end_swap_bio_write() SetPageError(page) VM_BUG_ON_PAGE(1 && PageCompound(page)) bio_endio+0x297/0x560 dec_pending+0x218/0x430 [dm_mod] clone_endio+0xe4/0x2c0 [dm_mod] bio_endio+0x297/0x560 blk_update_request+0x201/0x920 scsi_end_request+0x6b/0x4b0 scsi_io_completion+0x509/0x7e0 scsi_finish_command+0x1ed/0x2a0 scsi_softirq_done+0x1c9/0x1d0 __blk_mqnterrupt+0xf/0x20 Fix by checking PF_NO_TAIL in those places instead. Fixes: bd4c82c22c36 ("mm, THP, swap: delay splitting THP after swapped out") Signed-off-by: Qian Cai Signed-off-by: Andrew Morton Reviewed-by: David Hildenbrand Acked-by: "Huang, Ying" Acked-by: Rafael Aquini Cc: Link: http://lkml.kernel.org/r/20200310235846.1319-1-cai@lca.pw Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- include/linux/page-flags.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -311,7 +311,7 @@ static inline int TestClearPage##uname(s __PAGEFLAG(Locked, locked, PF_NO_TAIL) PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) -PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND) +PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL) PAGEFLAG(Referenced, referenced, PF_HEAD) TESTCLEARFLAG(Referenced, referenced, PF_HEAD) __SETPAGEFLAG(Referenced, referenced, PF_HEAD)