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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 140B3C55194 for ; Sun, 26 Apr 2020 17:38:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00C9B2070A for ; Sun, 26 Apr 2020 17:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726226AbgDZRiP (ORCPT ); Sun, 26 Apr 2020 13:38:15 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:51912 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726191AbgDZRiO (ORCPT ); Sun, 26 Apr 2020 13:38:14 -0400 Received: by mail-io1-f69.google.com with SMTP id k1so17850758iov.18 for ; Sun, 26 Apr 2020 10:38:12 -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=QtmphXsQ75V4Zs6d7ZRFjvUkwgefM7NFs4j9HWfvrPo=; b=YwHKuk6smE+WrVgCNXUH8nPxa5MQq7vsFCk7J2HQ9PJWHmKlU2n4BRfH5XeT8D+tO6 AiuAFd/BD+SHYNcWcbz/scgd3Sw+yt7mtiyvsN6bLFFheKakFl2SJucbadSOrNrt7edL Sc/kBvtp/PkaIHpfwOwyPVClh3+wVJ6a2gjyF7/vT9kP2QL4eRq1376p4RiVX+iUtYIT ZB2UkUz/A3w2BTIHlBPyFpJ7jQ1g5MOd/rwREwb+h3nEOjiTgMxS3YMiz0pVn2pR6Rc8 6E1hI5R1Kc4WXDJoihOv+0OeOZbSx0rpUWs05koMs++aBfP6VzuZh/UANS5DJ6nVy4nM CZRA== X-Gm-Message-State: AGi0PuaBwBkrmEYZuxhwEooZeRcToTaNEkIkIyLBgQB/vqEnRoazK0A6 /sVsq7/qGQ1p+W5lltA/s6vIk2M0DYg4uPtRcOxU21fZPTgP X-Google-Smtp-Source: APiQypLOMVfyo5tNzBqvwG2ylPG3JRgLXp2DLVl3dA6/XKzJjUFZIIlq/YpqzR7Vyvmc6d4iCCfsCL2PibwC2hRnaTPfhkqb8Zez MIME-Version: 1.0 X-Received: by 2002:a92:d18f:: with SMTP id z15mr18636909ilz.226.1587922692576; Sun, 26 Apr 2020 10:38:12 -0700 (PDT) Date: Sun, 26 Apr 2020 10:38:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000005d1ab05a4351006@google.com> Subject: INFO: rcu detected stall in wg_packet_tx_worker From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" 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: b2768df2 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16141e64100000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7a70e992f2f9b68 dashboard link: https://syzkaller.appspot.com/bug?extid=0251e883fe39e7a0cb0a compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f5f47fe00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11e8efb4100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0251e883fe39e7a0cb0a@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=272/1/0x4000000000000002 softirq=53996/53996 fqs=254 (t=10500 jiffies g=80873 q=139) rcu: rcu_preempt kthread starved for 9955 jiffies! g80873 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I28848 10 2 0x80004000 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline] rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 3483 Comm: kworker/1:8 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296 update_process_times+0x25/0x60 kernel/time/timer.c:1727 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:sfq_dequeue+0x19f/0xcc0 net/sched/sch_sfq.c:492 Code: 66 44 03 a5 e2 02 00 00 66 44 89 63 1a 48 8b 9d 28 03 00 00 48 8d 7b 12 48 89 f8 48 c1 e8 03 42 0f b6 14 30 48 89 f8 83 e0 07 <83> c0 01 38 d0 7c 08 84 d2 0f 85 2b 0a 00 00 44 0f b7 63 12 48 8b RSP: 0018:ffffc9000b69f4e0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffff8880986c2370 RCX: ffffffff86466097 RDX: 0000000000000000 RSI: ffffffff86465fd2 RDI: ffff8880986c2382 RBP: ffff888097c2d000 R08: ffff88809b468240 R09: fffff520016d3e7a R10: 0000000000000003 R11: fffff520016d3e79 R12: 0000000000000000 R13: ffff8880986c238a R14: dffffc0000000000 R15: 0000000000000002 dequeue_skb net/sched/sch_generic.c:263 [inline] qdisc_restart net/sched/sch_generic.c:366 [inline] __qdisc_run+0x1ac/0x17b0 net/sched/sch_generic.c:384 __dev_xmit_skb net/core/dev.c:3704 [inline] __dev_queue_xmit+0x1d07/0x30a0 net/core/dev.c:4021 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0xfb5/0x25b0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x442/0xab0 net/ipv6/ip6_output.c:143 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x239/0x810 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] ip6_local_out+0xaf/0x1a0 net/ipv6/output_core.c:179 ip6tunnel_xmit include/net/ip6_tunnel.h:160 [inline] udp_tunnel6_xmit_skb+0x6f4/0xcd0 net/ipv6/ip6_udp_tunnel.c:114 send6+0x4e3/0xb20 drivers/net/wireguard/socket.c:164 wg_socket_send_skb_to_peer+0xf5/0x220 drivers/net/wireguard/socket.c:189 wg_packet_create_data_done drivers/net/wireguard/send.c:250 [inline] wg_packet_tx_worker+0x30c/0xc30 drivers/net/wireguard/send.c:278 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches