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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 3EE76C43387 for ; Mon, 31 Dec 2018 08:03:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17CD821019 for ; Mon, 31 Dec 2018 08:03:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727127AbeLaIDF (ORCPT ); Mon, 31 Dec 2018 03:03:05 -0500 Received: from mail-it1-f198.google.com ([209.85.166.198]:59264 "EHLO mail-it1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725972AbeLaIDE (ORCPT ); Mon, 31 Dec 2018 03:03:04 -0500 Received: by mail-it1-f198.google.com with SMTP id p21so28882203itb.8 for ; Mon, 31 Dec 2018 00:03:04 -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=0k9NZuVb4n8iyYpV0AQdlr2djICXQ/Mea1gEl7dtGSA=; b=AYQAUah4iEegx9F1x8NnV0mxrCKkFkyBeCBXzs/FQKyMAKfxRTXCDypqbewU11ewtW AH4laceop+Vk+5VlRXgNSQsTXh6A9MqyP7cJDF8xecm32sauUg3tV3z6YtynaAF4YzPH ML24Nn+ryz1diM8gbvOyG45Pu1UtUXc6dxt8i2f9d4y8OfKKGdpHpHBDJblUw+Kffctz NqZtclGqIh9czywZ2Gpp/4kBDFuugUkVB8GHJuyZI49nuyfPvkZWPJk/kyzkmNF1r2il Z7uyIFD8MYf0uccGFhpLITC+XSdsmxtQpp2qKonuhcNARw2RbpGK7hc3mvU1ThFdOCvd LqDA== X-Gm-Message-State: AJcUukd+ZEZd6x+Cch8pHCzdxM+uV2R8/0JdYTFgJToWcW3tJg/UAjH4 2ooWhw+i4cF74MPfnHOTHWjYOkRDiP04w7tkL2+q4Az/4D39 X-Google-Smtp-Source: ALg8bN7Slk7q3X9dKiGoOURt3nWY4BmHDbAcp5hsRt8N/o6HgURCZFC/VX//ilsicl7zCjojEeI75RxWUrHUAOF1ytasqpskmzQj MIME-Version: 1.0 X-Received: by 2002:a6b:8e83:: with SMTP id q125mr34641266iod.9.1546243383448; Mon, 31 Dec 2018 00:03:03 -0800 (PST) Date: Mon, 31 Dec 2018 00:03:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009b5ae5057e4cd7d1@google.com> Subject: INFO: rcu detected stall in x25_connect From: syzbot To: andrew.hendry@gmail.com, davem@davemloft.net, dvlasenk@redhat.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-x25@vger.kernel.org, ms@dev.tdt.de, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 38355a5f9a22 bnx2x: Fix NULL pointer dereference in bnx2x_.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=15fe1677400000 kernel config: https://syzkaller.appspot.com/x/.config?x=a91d685acb971514 dashboard link: https://syzkaller.appspot.com/bug?extid=564c57b4bf1df3ce1c94 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+564c57b4bf1df3ce1c94@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=b82/1/0x4000000000000002 softirq=245727/245728 fqs=2 rcu: (t=10500 jiffies g=375665 q=22) rcu: rcu_preempt kthread starved for 10496 jiffies! g375665 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I22568 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934 rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 23613 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #249 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+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x16f/0x1bc kernel/rcu/tree.c:1195 print_cpu_stall.cold.65+0x1f3/0x3c6 kernel/rcu/tree.c:1334 check_cpu_stall kernel/rcu/tree.c:1408 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xac1/0x1410 kernel/rcu/tree.c:2506 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__x25_find_socket+0x6c/0x110 net/x25/af_x25.c:327 Code: 2f e8 d8 a9 87 fa 48 8d 7b 68 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 a1 00 00 00 48 8b 5b 68 48 85 db 74 7c e8 b4 a9 87 fa <48> 83 eb 68 74 71 e8 a9 a9 87 fa 48 8d bb 88 04 00 00 48 89 f8 48 RSP: 0018:ffff88806485faa8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: ffff88809f242a68 RCX: ffffc90005df9000 RDX: 0000000000040000 RSI: ffffffff86f6b08c RDI: ffff88809f242a68 RBP: ffff88806485fad0 R08: ffff88808e4e8700 R09: fffffbfff13fc688 R10: fffffbfff13fc688 R11: ffffffff89fe3443 R12: dffffc0000000000 R13: 0000000000000001 R14: ffff88809b212940 R15: 0000000000000000 x25_new_lci net/x25/af_x25.c:357 [inline] x25_connect+0x380/0x1050 net/x25/af_x25.c:786 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb14afb2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000000000012 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb14afb36d4 R13: 00000000004be22e R14: 00000000004ce488 R15: 00000000ffffffff --- 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#bug-status-tracking for how to communicate with syzbot.