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 64D27C43331 for ; Thu, 7 Nov 2019 18:54:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 490C8218AE for ; Thu, 7 Nov 2019 18:54:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727185AbfKGSyL (ORCPT ); Thu, 7 Nov 2019 13:54:11 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:51113 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726656AbfKGSyL (ORCPT ); Thu, 7 Nov 2019 13:54:11 -0500 Received: by mail-il1-f199.google.com with SMTP id z12so3562366ilm.17 for ; Thu, 07 Nov 2019 10:54:10 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=m2Qa1E1MJM3JwHE0ZbVyKXnicQ++QYA8NZNL8xEGd0k=; b=k5QOhvfLYkmEuhUtm65HL4ht9yXzZUHOWhX2HtbTzGxr0zXmQ1DizV2vqH1wwByFjN a7UBxWSd6nov6EuxfaO1XzIhzwv9+vxNKqE55f1pp3nDNqDlwxM6OGLH9AWJvjbmiYoE b4PG3LczleM16qMou82+ygAJSnJ6oofmfQZL6RLGdbRDPv1N1I5YowugrZy2IvmHShAJ PGeo64wNIJOkQRrvEVfYCLORvTfNC9EIc65Lj4KNk2IMQZK6wpH0GkIm3QiRpHan8dTA 1Ni1Vc+iqAT3BQ15rSpFlu8y95D0jVhnS+S+O0umW7aGLuyEOgoGSt3jSH5M0N8W9fKK 2AyA== X-Gm-Message-State: APjAAAVuGNK8r8QxRCQbWapYw+ZMQocFimDGLnRJ0I/JHWpl/y/RmSLE dtBQDoNnL6btG6vFAEcH573pjeEJ85Z9WR4F1GUh0B2xKJJX X-Google-Smtp-Source: APXvYqyEE3VyCBIcL7gUe9uBCXoJUzB4GHP/i130evFYgnvcyekpRWdvKhZjT4ksDss52iO6eeW/umQvYPF63zDyDa+CTIC1S2/t MIME-Version: 1.0 X-Received: by 2002:a92:c08c:: with SMTP id h12mr6144591ile.183.1573152850575; Thu, 07 Nov 2019 10:54:10 -0800 (PST) Date: Thu, 07 Nov 2019 10:54:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d60aa50596c63063@google.com> Subject: WARNING in iov_iter_pipe From: syzbot To: jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mbobrowski@mbobrowski.org, riteshh@linux.ibm.com, syzkaller-bugs@googlegroups.com, tytso@mit.edu, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c68c5373 Add linux-next specific files for 20191107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13d6bcfce00000 kernel config: https://syzkaller.appspot.com/x/.config?x=742545dcdea21726 dashboard link: https://syzkaller.appspot.com/bug?extid=991400e8eba7e00a26e1 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1529829ae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16a55c0ce00000 The bug was bisected to: commit b1b4705d54abedfd69dcdf42779c521aa1e0fbd3 Author: Matthew Bobrowski Date: Tue Nov 5 12:01:37 2019 +0000 ext4: introduce direct I/O read using iomap infrastructure bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1176cffae00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=1376cffae00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1576cffae00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+991400e8eba7e00a26e1@syzkaller.appspotmail.com Fixes: b1b4705d54ab ("ext4: introduce direct I/O read using iomap infrastructure") ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8715 at lib/iov_iter.c:1162 iov_iter_pipe+0x25b/0x2f0 lib/iov_iter.c:1162 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8715 Comm: syz-executor719 Not tainted 5.4.0-rc6-next-20191107 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:iov_iter_pipe+0x25b/0x2f0 lib/iov_iter.c:1162 Code: 83 c0 03 38 d0 7c 04 84 d2 75 33 44 89 63 24 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ac ba 2e fe 0f 0b e8 a5 ba 2e fe <0f> 0b e9 53 fe ff ff 4c 89 f7 e8 46 e5 6a fe e9 f5 fd ff ff e8 dc RSP: 0018:ffff8880a0b4f988 EFLAGS: 00010293 RAX: ffff88808f1602c0 RBX: ffff8880a0b4fa18 RCX: ffffffff8344ac89 RDX: 0000000000000000 RSI: ffffffff8344ae3b RDI: 0000000000000004 RBP: ffff8880a0b4f9c0 R08: ffff88808f1602c0 R09: 0000000000000000 R10: fffffbfff1390168 R11: ffffffff89c80b47 R12: ffff88808f121c00 R13: 0000000000000010 R14: ffff88808f121cc8 R15: ffff88808f121cd0 generic_file_splice_read+0xa7/0x800 fs/splice.c:303 do_splice_to+0x127/0x180 fs/splice.c:877 splice_direct_to_actor+0x2d3/0x970 fs/splice.c:955 do_splice_direct+0x1da/0x2a0 fs/splice.c:1064 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446969 Code: e8 4c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f05c41b8ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446969 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000006dbc5c R13: 00007fffb77353df R14: 00007f05c41b99c0 R15: 20c49ba5e353f7cf Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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