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 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 ECAEBC606BD for ; Mon, 8 Jul 2019 15:40:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF29B20651 for ; Mon, 8 Jul 2019 15:40:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388976AbfGHP1J (ORCPT ); Mon, 8 Jul 2019 11:27:09 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:35997 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388494AbfGHP1H (ORCPT ); Mon, 8 Jul 2019 11:27:07 -0400 Received: by mail-io1-f71.google.com with SMTP id k21so19418660ioj.3 for ; Mon, 08 Jul 2019 08:27:06 -0700 (PDT) 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=3nI8UbSCiooQf96iEA6wfjiUATlcUVGksrHHHOQhhhs=; b=GrICsouaCCDTG4OMHdVRa1WvOTXXh5aRVwzBzK/ETfPk6ZvbCdD2vsgBC+z4BZsfVu 3nACMhF6CX882orftIjaKSL4nUbHwpxHOmExYsm8k8/Mhezsw6NjFT4gnLRE5Q7zHQb9 B4oWyLRZDdE9XuXAjmYUPwKPVDcybHeXm9B/T7PTQZd6MCloupkr4h59px8wAEPctL3S nF5hfcHCgBT1bi8+hQQd6iVLuL6mz4pKleTqZQVvOebhbxIK1n8LtKfJlPGjJ8aiMIhw MUgCRmC/eN0ntp/WXdf+dAw9noFd3KoGovOj0mMYgKNgx6l+8ZtC6IyYG9IDKFNwK83g i5+Q== X-Gm-Message-State: APjAAAVpJYFoqfjzjIwUnryVvAgaHg12uQ4urG3SQ3tdfeEhfAH2ppuw BqUoiZxfz9CNCNa6QvWDr9tuJfTd6xksJ/tZs6L/WU3OvwpP X-Google-Smtp-Source: APXvYqycAClhmc4W0ti+D9tCXsNSD9MBYwivSwqYPI1u7OpcYY3vXDxVd8tgt++cGt0IhLdRDc+zw5sPnC7pY0b56WN6EB5QWVnz MIME-Version: 1.0 X-Received: by 2002:a5d:8ad0:: with SMTP id e16mr14295286iot.262.1562599626231; Mon, 08 Jul 2019 08:27:06 -0700 (PDT) Date: Mon, 08 Jul 2019 08:27:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a5d738058d2d1396@google.com> Subject: WARNING in __mark_chain_precision From: syzbot To: ast@kernel.org, bcrl@kvack.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, jakub.kicinski@netronome.com, john.fastabend@gmail.com, kafai@fb.com, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, xdp-newbies@vger.kernel.org, yhs@fb.com 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: e5a3e259 Merge branch 'bpf-tcp-rtt-hook' git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=14190c2da00000 kernel config: https://syzkaller.appspot.com/x/.config?x=dd16b8dc9d0d210c dashboard link: https://syzkaller.appspot.com/bug?extid=4da3ff23081bafe74fc2 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1409ce0da00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17226a0da00000 The bug was bisected to: commit b53119f13a04879c3bf502828d99d13726639ead Author: Linus Torvalds Date: Thu Mar 7 01:22:54 2019 +0000 pin iocb through aio. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11427b8ba00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=13427b8ba00000 console output: https://syzkaller.appspot.com/x/log.txt?x=15427b8ba00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4da3ff23081bafe74fc2@syzkaller.appspotmail.com Fixes: b53119f13a04 ("pin iocb through aio.") ------------[ cut here ]------------ verifier backtracking bug WARNING: CPU: 0 PID: 9104 at kernel/bpf/verifier.c:1785 __mark_chain_precision+0x19bb/0x1ee0 kernel/bpf/verifier.c:1785 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9104 Comm: syz-executor284 Not tainted 5.2.0-rc5+ #34 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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x744 kernel/panic.c:219 __warn.cold+0x20/0x4d kernel/panic.c:576 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986 RIP: 0010:__mark_chain_precision+0x19bb/0x1ee0 kernel/bpf/verifier.c:1785 Code: 08 31 ff 89 de e8 95 ba f2 ff 84 db 0f 85 ce fe ff ff e8 48 b9 f2 ff 48 c7 c7 e0 44 91 87 c6 05 1c 15 1f 08 01 e8 03 f1 c4 ff <0f> 0b 41 bc f2 ff ff ff e9 af fe ff ff e8 d3 3c 2c 00 e9 c2 e7 ff RSP: 0018:ffff88809f04f380 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ad926 RDI: ffffed1013e09e62 RBP: ffff88809f04f4d0 R08: ffff88809987a540 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88809af0c280 R14: 0000000000000001 R15: ffff88809f65cb00 mark_chain_precision kernel/bpf/verifier.c:1822 [inline] check_cond_jmp_op+0xcd8/0x3c30 kernel/bpf/verifier.c:5842 do_check+0x60f4/0x8a20 kernel/bpf/verifier.c:7782 bpf_check+0x6f99/0x9950 kernel/bpf/verifier.c:9293 bpf_prog_load+0xe68/0x1670 kernel/bpf/syscall.c:1698 __do_sys_bpf+0xa20/0x42d0 kernel/bpf/syscall.c:2849 __se_sys_bpf kernel/bpf/syscall.c:2808 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2808 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440369 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffca85a2fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440369 RDX: 0000000000000048 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401bf0 R13: 0000000000401c80 R14: 0000000000000000 R15: 0000000000000000 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