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 2888AC7618B for ; Fri, 26 Jul 2019 09:38:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF40F206DD for ; Fri, 26 Jul 2019 09:38:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726252AbfGZJiI (ORCPT ); Fri, 26 Jul 2019 05:38:08 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:48787 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726026AbfGZJiH (ORCPT ); Fri, 26 Jul 2019 05:38:07 -0400 Received: by mail-io1-f71.google.com with SMTP id z19so58166973ioi.15 for ; Fri, 26 Jul 2019 02:38:06 -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=j2PpSjwLnO2eIe3uBjpnMCjddJMfh5EpcYJWBvbsYKo=; b=RrwBdQyUSBXqed6KiUOTHrB+fZDVztlykbCO/qf0nPk6u0CWJvLZdDq3hxUQxXIuT7 pYVATs+fZyCh5HRD7FXjnjQSulY2tSTU9zmJ2kLf+urLdXT1L/HPs88Da2UfAMuYz4us wIP1HaF7mqGko70xx43oW0plXhFPEmNdmPm3gQoCW3hqLIyn2dtEj5MXP9pVBcOuLpd+ H+9swqRUZKr5nJB8lC1Y+Yn/y5oQ1X5fkGjRRBFJDw3UugPyOjk0v6BRxDReCx5rRL51 qPwL5X8HTdiZfa3jjXOC3Py83ZyCrp8U7Ypf8UN49V63YL/CaNe26KhZyu40ZsM1/9Le mWkg== X-Gm-Message-State: APjAAAWW+/zj+pCsBF8x+KYf79+SvcNGCxa+s/B2D4Ix+9xkrjUEU46D oVQLBc4OxZYNLcVxxPdzR+6SAVcr5ArxBgFHTaxmawMcULy6 X-Google-Smtp-Source: APXvYqx/f2gWDhwCONRj6jdiiIlMyabLv+3dxZoCyfbLX3KK64QU0+v3iKTWk3YEBBBdvasEay5lAUn8HZobIxyfkuXBjHnS0hI4 MIME-Version: 1.0 X-Received: by 2002:a05:6638:281:: with SMTP id c1mr94958147jaq.43.1564133886487; Fri, 26 Jul 2019 02:38:06 -0700 (PDT) Date: Fri, 26 Jul 2019 02:38:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000af7322058e924cde@google.com> Subject: INFO: rcu detected stall in ipv6_rcv (2) From: syzbot To: andrew@lunn.ch, arvid.brodin@alten.se, aviadye@mellanox.com, borisp@mellanox.com, daniel@iogearbox.net, davejwatson@fb.com, davem@davemloft.net, f.fainelli@gmail.com, hkallweit1@gmail.com, huangfq.daxian@gmail.com, john.fastabend@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 13bf6d6a Add linux-next specific files for 20190725 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16c5cd94600000 kernel config: https://syzkaller.appspot.com/x/.config?x=8ae987d803395886 dashboard link: https://syzkaller.appspot.com/bug?extid=34f3e3f781b524b5127a compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15e55df4600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142f7768600000 The bug was bisected to: commit ccf355e52a3265624b7acadd693c849d599e9b9f Author: Fuqian Huang Date: Mon Jul 8 12:34:17 2019 +0000 net: phy: Make use of linkmode_mod_bit helper bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12285f58600000 final crash: https://syzkaller.appspot.com/x/report.txt?x=11285f58600000 console output: https://syzkaller.appspot.com/x/log.txt?x=16285f58600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+34f3e3f781b524b5127a@syzkaller.appspotmail.com Fixes: ccf355e52a32 ("net: phy: Make use of linkmode_mod_bit helper") TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=c0a/1/0x4000000000000002 softirq=11627/11628 fqs=5250 (t=10500 jiffies g=10477 q=33) NMI backtrace for cpu 1 CPU: 1 PID: 10160 Comm: syz-executor291 Not tainted 5.3.0-rc1-next-20190725 #52 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 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x183/0x1cf kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1093 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:656 [inline] RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:84 [inline] RIP: 0010:native_queued_spin_lock_slowpath+0x132/0x9f0 kernel/locking/qspinlock.c:325 Code: 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 37 07 00 00 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 73 ff ff ff 8b 45 98 4c 8d 65 d8 3d 00 01 00 00 0f 84 e5 00 00 RSP: 0018:ffff8880ae909210 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff88809338ad08 RCX: ffffffff81599777 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88809338ad08 RBP: ffff8880ae9092d0 R08: 1ffff110126715a1 R09: ffffed10126715a2 R10: ffffed10126715a1 R11: ffff88809338ad0b R12: 0000000000000001 R13: 0000000000000003 R14: ffffed10126715a1 R15: 0000000000000001 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:642 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline] queued_spin_lock include/asm-generic/qspinlock.h:81 [inline] do_raw_spin_lock+0x20e/0x2e0 kernel/locking/spinlock_debug.c:113 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x3b/0x50 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:343 [inline] release_sock+0x20/0x1c0 net/core/sock.c:2932 wait_on_pending_writer+0x20f/0x420 net/tls/tls_main.c:91 tls_sk_proto_cleanup+0x2c5/0x3e0 net/tls/tls_main.c:295 tls_sk_proto_unhash+0x90/0x3f0 net/tls/tls_main.c:330 tcp_set_state+0x5b9/0x7d0 net/ipv4/tcp.c:2235 tcp_done+0xe2/0x320 net/ipv4/tcp.c:3824 tcp_reset+0x132/0x500 net/ipv4/tcp_input.c:4080 tcp_validate_incoming+0xa2d/0x1660 net/ipv4/tcp_input.c:5440 tcp_rcv_established+0x6b5/0x1e70 net/ipv4/tcp_input.c:5648 tcp_v6_do_rcv+0x41e/0x12c0 net/ipv6/tcp_ipv6.c:1356 tcp_v6_rcv+0x31f1/0x3500 net/ipv6/tcp_ipv6.c:1588 ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish+0x1de/0x2f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:4999 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5113 process_backlog+0x206/0x750 net/core/dev.c:5924 napi_poll net/core/dev.c:6347 [inline] net_rx_action+0x508/0x10c0 net/core/dev.c:6413 __do_softirq+0x262/0x98c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1080 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] inet_csk_listen_stop+0x1e0/0x850 net/ipv4/inet_connection_sock.c:993 tcp_close+0xd5b/0x10e0 net/ipv4/tcp.c:2338 inet_release+0xed/0x200 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x406571 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffc1a1a5e00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406571 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 R10: 00007ffc1a1a5e30 R11: 0000000000000293 R12: 00007ffc1a1a5e60 R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007 --- 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