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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 5BDFDC43331 for ; Sun, 10 Nov 2019 23:44:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24FFF206C3 for ; Sun, 10 Nov 2019 23:44:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726730AbfKJXoL (ORCPT ); Sun, 10 Nov 2019 18:44:11 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:37727 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a92:1dc6:: with SMTP id g67mr25717512ile.182.1573429450098; Sun, 10 Nov 2019 15:44:10 -0800 (PST) Date: Sun, 10 Nov 2019 15:44:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000073d3a70597069799@google.com> Subject: general protection fault in ext4_writepages From: syzbot To: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, riteshh@linux.ibm.com, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: dcd34bd2 Add linux-next specific files for 20191106 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11a0a4fce00000 kernel config: https://syzkaller.appspot.com/x/.config?x=742545dcdea21726 dashboard link: https://syzkaller.appspot.com/bug?extid=9567fda428fba259deba compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1645c42ce00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1108a23ae00000 The bug was bisected to: commit c8cc88163f40df39e50cda63ac361631864b453e Author: Ritesh Harjani Date: Wed Oct 16 07:37:10 2019 +0000 ext4: Add support for blocksize < pagesize in dioread_nolock bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1044c6b4e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=1244c6b4e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1444c6b4e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9567fda428fba259deba@syzkaller.appspotmail.com Fixes: c8cc88163f40 ("ext4: Add support for blocksize < pagesize in dioread_nolock") RDX: 0000000000000000 RSI: 0000000100000003 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000001 R09: 00007fffd7a50033 R10: 0000000028120001 R11: 0000000000000246 R12: 0000000000401ef0 R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8639 Comm: syz-executor031 Not tainted 5.4.0-rc6-next-20191106 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2557 [inline] RIP: 0010:ext4_writepages+0x17b4/0x2e80 fs/ext4/inode.c:2911 Code: ff ff e8 1f cf b0 ff 48 8b 85 30 fe ff ff 48 8b 8d 00 fe ff ff 48 8d 78 10 48 89 fa 48 c1 ea 03 0f b6 89 c2 00 00 00 48 d3 e3 <42> 80 3c 2a 00 0f 85 03 16 00 00 48 89 58 10 48 c7 c0 08 ad c4 89 RSP: 0018:ffff88808bf77890 EFLAGS: 00010206 RAX: fffffffffffffff4 RBX: 00000000007ff000 RCX: 000000000000000c RDX: 0000000000000000 RSI: ffffffff820534cd RDI: 0000000000000004 RBP: ffff88808bf77ac0 R08: 0000000000000000 R09: ffffed1015d06b7d R10: ffffed1015d06b7c R11: ffff8880ae835be3 R12: 0000000000000000 R13: dffffc0000000000 R14: 00000000000007ff R15: ffff888086499488 FS: 0000000001162880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000009366b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? 0xffffffff81000000 do_writepages+0xfa/0x2a0 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x2bc/0x3b0 mm/filemap.c:421 filemap_write_and_wait_range mm/filemap.c:681 [inline] filemap_write_and_wait_range+0xfc/0x1d0 mm/filemap.c:675 ext4_punch_hole+0x27d/0x1320 fs/ext4/inode.c:4314 ext4_fallocate+0x419/0x2470 fs/ext4/extents.c:4889 vfs_fallocate+0x4aa/0xa50 fs/open.c:309 ksys_fallocate+0x58/0xa0 fs/open.c:332 __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:338 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440609 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0f 83 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffd7a50c58 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fffd7a50c60 RCX: 0000000000440609 RDX: 0000000000000000 RSI: 0000000100000003 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000001 R09: 00007fffd7a50033 R10: 0000000028120001 R11: 0000000000000246 R12: 0000000000401ef0 R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0ee46d2ea32148f5 ]--- RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2557 [inline] RIP: 0010:ext4_writepages+0x17b4/0x2e80 fs/ext4/inode.c:2911 Code: ff ff e8 1f cf b0 ff 48 8b 85 30 fe ff ff 48 8b 8d 00 fe ff ff 48 8d 78 10 48 89 fa 48 c1 ea 03 0f b6 89 c2 00 00 00 48 d3 e3 <42> 80 3c 2a 00 0f 85 03 16 00 00 48 89 58 10 48 c7 c0 08 ad c4 89 RSP: 0018:ffff88808bf77890 EFLAGS: 00010206 RAX: fffffffffffffff4 RBX: 00000000007ff000 RCX: 000000000000000c RDX: 0000000000000000 RSI: ffffffff820534cd RDI: 0000000000000004 RBP: ffff88808bf77ac0 R08: 0000000000000000 R09: ffffed1015d06b7d R10: ffffed1015d06b7c R11: ffff8880ae835be3 R12: 0000000000000000 R13: dffffc0000000000 R14: 00000000000007ff R15: ffff888086499488 FS: 0000000001162880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000009366b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches