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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 067E9EB64DA for ; Wed, 5 Jul 2023 13:16:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232178AbjGENQS (ORCPT ); Wed, 5 Jul 2023 09:16:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231252AbjGENQR (ORCPT ); Wed, 5 Jul 2023 09:16:17 -0400 Received: from mail-pj1-f77.google.com (mail-pj1-f77.google.com [209.85.216.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F443170B for ; Wed, 5 Jul 2023 06:16:16 -0700 (PDT) Received: by mail-pj1-f77.google.com with SMTP id 98e67ed59e1d1-262e04a6fd1so7201492a91.3 for ; Wed, 05 Jul 2023 06:16:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688562976; x=1691154976; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IIk9zvRqAoodatZm9jYHERXkpamH/cmGL+b216JrZNc=; b=Mf7pe1Nut5d2d0FJodRWd3NEhlePE3jkaLBo5u9hDJ3dPZipIy4lksUAh3vEWyG8CL AX8N0SK8vTbyYrzkeaf/PNPU3zEch9VsFvj3I0d+2U3VC6Yi5ICp57ENUAkI5AoBm5H5 K1PmLIVyuCEfEp+VykRb6QAh8z+rvq3pKbyDiwG1s26HOVEmF3Z5ZMvR/MRGyYG/AE27 77960KnUTwqafpTqF+xJfZF8hfAsOxi7kW5YdyZ+O4u7H7U9RrIM4De2kxJSXS9O3vjI BCPFIOYmHiylYJMnuoaeck7l/sBRVgizGvROmPIEbS2NttdWIXjN/L6B3yR6vxiTKo3U 7ADg== X-Gm-Message-State: ABy/qLYnkOogi9xTW5+OwsjU7yoxjXvq3F5cCegVhiQ51v5VJGFPjwON FBB26NE+4vaSJsvoiOgDe0zkrEYDydreBWizkuTZq/ighPWm X-Google-Smtp-Source: APBJJlGnLA1HCX+pDshOles/SvAiH3bTJIJT0UiZPiYo8P0pwaQoUTPZN0gdfOFE14eCbBRpoO6mprXu6GUj3weT12N5NMYtGyc+ MIME-Version: 1.0 X-Received: by 2002:a17:903:5cc:b0:1b8:8b6e:6431 with SMTP id kf12-20020a17090305cc00b001b88b6e6431mr8980168plb.12.1688562975862; Wed, 05 Jul 2023 06:16:15 -0700 (PDT) Date: Wed, 05 Jul 2023 06:16:15 -0700 In-Reply-To: <0000000000002db68f05ffb791bc@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005b75ce05ffbd34bc@google.com> Subject: Re: [syzbot] [fs?] WARNING in handle_userfault From: syzbot To: brauner@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: e1f6a8eaf1c2 Add linux-next specific files for 20230705 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ec5228a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=347a3e7e531c1809 dashboard link: https://syzkaller.appspot.com/bug?extid=339b02f826caafd5f7a8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1716aeaca80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e882e2a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2d0435d8ff5d/disk-e1f6a8ea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d28b2df82094/vmlinux-e1f6a8ea.xz kernel image: https://storage.googleapis.com/syzbot-assets/fb4e5bfa0a0f/bzImage-e1f6a8ea.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+339b02f826caafd5f7a8@syzkaller.appspotmail.com kvm_intel: L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5028 at include/linux/mmap_lock.h:71 mmap_assert_write_locked include/linux/mmap_lock.h:71 [inline] WARNING: CPU: 0 PID: 5028 at include/linux/mmap_lock.h:71 __is_vma_write_locked include/linux/mm.h:712 [inline] WARNING: CPU: 0 PID: 5028 at include/linux/mmap_lock.h:71 vma_assert_locked include/linux/mm.h:753 [inline] WARNING: CPU: 0 PID: 5028 at include/linux/mmap_lock.h:71 assert_fault_locked include/linux/mm.h:786 [inline] WARNING: CPU: 0 PID: 5028 at include/linux/mmap_lock.h:71 handle_userfault+0x149b/0x27a0 fs/userfaultfd.c:440 Modules linked in: CPU: 0 PID: 5028 Comm: syz-executor359 Not tainted 6.4.0-next-20230705-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:mmap_assert_write_locked include/linux/mmap_lock.h:71 [inline] RIP: 0010:__is_vma_write_locked include/linux/mm.h:712 [inline] RIP: 0010:vma_assert_locked include/linux/mm.h:753 [inline] RIP: 0010:assert_fault_locked include/linux/mm.h:786 [inline] RIP: 0010:handle_userfault+0x149b/0x27a0 fs/userfaultfd.c:440 Code: ff 49 8d bc 24 a0 01 00 00 31 f6 e8 2f b9 23 08 31 ff 41 89 c5 89 c6 e8 c3 a2 87 ff 45 85 ed 0f 85 83 ed ff ff e8 95 a6 87 ff <0f> 0b e9 77 ed ff ff e8 89 a6 87 ff 49 8d bc 24 a0 01 00 00 be ff RSP: 0000:ffffc90003a4fb68 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc90003a4fd88 RCX: 0000000000000000 RDX: ffff8880133bbb80 RSI: ffffffff81fd6ddb RDI: 0000000000000005 RBP: 0000000000000200 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807d8e4280 R13: 0000000000000000 R14: ffff888021cb9110 R15: ffff888021cb9100 FS: 000055555738f300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020b7d800 CR3: 0000000029d0e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_anonymous_page mm/memory.c:4151 [inline] do_pte_missing mm/memory.c:3671 [inline] handle_pte_fault mm/memory.c:4949 [inline] __handle_mm_fault+0x35ff/0x3cc0 mm/memory.c:5089 handle_mm_fault+0x3c2/0xa20 mm/memory.c:5254 do_user_addr_fault+0x2ed/0x13a0 arch/x86/mm/fault.c:1365 handle_page_fault arch/x86/mm/fault.c:1509 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1565 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7faa694e34d5 Code: 52 89 c2 01 f6 29 f2 83 fa 05 0f 87 0a 02 00 00 48 63 14 97 48 01 fa ff e2 0f 1f 40 00 4c 89 d2 66 c1 e9 03 83 c0 01 0f b7 c9 <48> 89 14 cd 00 d8 b7 20 83 f8 20 75 b6 48 8b 84 24 f0 00 00 00 f3 RSP: 002b:00007ffefcb0d8e0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000860000109120 RSI: 0000000000000000 RDI: 00007faa69564020 RBP: 0000000000000006 R08: 0000830000789120 R09: 00000000aaaaaaab R10: 0000870000109120 R11: 00008f0000309120 R12: 00008b0000889120 R13: 0000000000000000 R14: 00008e0000309120 R15: 00007ffefcb0de40 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.