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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id A119ACDB47E for ; Wed, 18 Oct 2023 20:49:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4467E80023; Wed, 18 Oct 2023 16:49:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3F65E8D0016; Wed, 18 Oct 2023 16:49:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2E53180023; Wed, 18 Oct 2023 16:49:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 1E3798D0016 for ; Wed, 18 Oct 2023 16:49:06 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id DB3A6120EC6 for ; Wed, 18 Oct 2023 20:49:05 +0000 (UTC) X-FDA: 81359771850.14.E8A5441 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf08.hostedemail.com (Postfix) with ESMTP id 6FC9516001B for ; Wed, 18 Oct 2023 20:49:03 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=aAleQllB; spf=pass (imf08.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1697662144; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=6Qo15IFr45GglFl0/HsVjp2K6xEBjcn2YWUYIizB+AI=; b=Vij/9YFCuofTCCRKYAr3ITshBd7060TmEnb84L0BqhrnQEc5QlYRqD4PMjUebYN1o3XSDL tm/esS7vxjXip61VWoJb4Angd8mrtIi4WROLUxJbiUkXVhUS/HLveMISsfd2f/EsCLLgL4 BdlBDbadqEvCixTLEwKoPc5l+n46uog= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1697662144; a=rsa-sha256; cv=none; b=R6bag+riDdRRQWczTQzGO05Y1E5rtm/Ep/WuCnMGXbSWeR1EgGZFodqhLAknTBWU4Vtc+p C8bxanOMelEjWl3bWvjfW3l7q4LjyWyxFbOlj9jiIQm4Bs8l+l0x3+TfN0w26T8IIifopq FM1wU9GBQI4FOHS1psJ/rIAjkyuwhWE= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=aAleQllB; spf=pass (imf08.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id C99E6CE269A; Wed, 18 Oct 2023 20:48:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1647C433C7; Wed, 18 Oct 2023 20:48:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1697662139; bh=JuWErFM2WrGzAy7+fDdBQTFA8S4wJj0BlJeoUkTkeRc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=aAleQllBVR74KbuenGmF3jh3LPxow1/kFCOEqYwYErco11/Y21XSj5+o96sTrN77y jVs0vPaUjSDPuS3bO1mwExCOjQ44isZJ0X26nnkO4/6wAtzJdFzIvZNJOIfgz7vdXo LI5MpwObECWOWSHXjQy4aPQgQtQsUFb6siKsf6Sc= Date: Wed, 18 Oct 2023 13:48:58 -0700 From: Andrew Morton To: syzbot Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, "Vishal Moola (Oracle)" Subject: Re: [syzbot] [mm?] [fs?] general protection fault in folio_flags Message-Id: <20231018134858.e0c6445045f5f6c3954f6a62@linux-foundation.org> In-Reply-To: <00000000000085670f060802a9bd@google.com> References: <00000000000085670f060802a9bd@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: ku5nz7ytwwtjq1kyaxamjfdsmesiyrqd X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 6FC9516001B X-Rspam-User: X-HE-Tag: 1697662143-269195 X-HE-Meta: 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 aS8YPpIg 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 18 Oct 2023 12:29:47 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 2dac75696c6d Add linux-next specific files for 20231018 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=13858275680000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6f8545e1ef7a2b66 > dashboard link: https://syzkaller.appspot.com/bug?extid=1e2648076cadf48ad9a1 > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17543ee5680000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=101f5fe5680000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/2375f16ed327/disk-2dac7569.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/c80aee6e2e6c/vmlinux-2dac7569.xz > kernel image: https://storage.googleapis.com/syzbot-assets/664dc23b738d/bzImage-2dac7569.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1e2648076cadf48ad9a1@syzkaller.appspotmail.com Thanks. > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASA > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 1 PID: 5710 Comm: syz-executor155 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 > RIP: 0010:PageTail include/linux/page-flags.h:286 [inline] > RIP: 0010:folio_flags.constprop.0+0x21/0x150 include/linux/page-flags.h:313 > Code: 84 00 00 00 00 00 0f 1f 00 41 54 55 53 48 89 fb e8 14 2f a4 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 00 01 00 00 48 8b 6b 08 31 ff 83 e5 01 48 89 ee > RSP: 0018:ffffc90004367968 EFLAGS: 00010247 > RAX: dffffc0000000000 RBX: fffffffffffffffe RCX: ffffffff81b7e126 > RDX: 0000000000000000 RSI: ffffffff81e49d1c RDI: 0000000000000006 > RBP: 0000000020200000 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000000 R11: 1ffffffff1976fb9 R12: ffff88801675b900 > R13: ffff888025f9f680 R14: fffffffffffffffe R15: 1ffff9200086cf3d > FS: 00007f2f2a17c6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f2f2a17cd58 CR3: 000000001bfa0000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > folio_test_head include/linux/page-flags.h:790 [inline] > folio_test_large include/linux/page-flags.h:811 [inline] > folio_order include/linux/mm.h:1079 [inline] > collapse_pte_mapped_thp+0x42d/0x13b0 mm/khugepaged.c:1512 Vishal, could you please take a look? > madvise_collapse+0x875/0xaf0 mm/khugepaged.c:2761 > madvise_vma_behavior+0x1fe/0x1d00 mm/madvise.c:1086 > madvise_walk_vmas+0x1cf/0x2c0 mm/madvise.c:1260 > do_madvise+0x333/0x660 mm/madvise.c:1440 > __do_sys_madvise mm/madvise.c:1453 [inline] > __se_sys_madvise mm/madvise.c:1451 [inline] > __x64_sys_madvise+0xaa/0x110 mm/madvise.c:1451 > do_syscall_x64 arch/x86/entry/common.c:51 [inline] > do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f2f2a1dc7a9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f2f2a17c238 EFLAGS: 00000246 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 00007f2f2a266318 RCX: 00007f2f2a1dc7a9 > RDX: 0000000000000019 RSI: 000000000060005f RDI: 0000000020000000 > RBP: 00007f2f2a266310 R08: 00007ffe616d77f7 R09: 00007f2f2a17c6c0 > R10: 0000000000000000 R11: 0000000000000246 R12: b635773f07ebbeef > R13: 000000000000006e R14: 00007ffe616d7710 R15: 00007ffe616d77f8 > > ... >