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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 57F7CC433DB for ; Fri, 29 Jan 2021 04:12:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FC8A64D7F for ; Fri, 29 Jan 2021 04:12:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231864AbhA2EMA (ORCPT ); Thu, 28 Jan 2021 23:12:00 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:45712 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229885AbhA2EL6 (ORCPT ); Thu, 28 Jan 2021 23:11:58 -0500 Received: by mail-il1-f197.google.com with SMTP id h17so6587328ila.12 for ; Thu, 28 Jan 2021 20:11:43 -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=M5M3YzHPCAGAqtaruCAEC8IMMPdUQpzTxI40cnJIAO8=; b=Mpa3vgMrlnEcB8YGwhLwjYBZ8F1JWuxs7L56/fi6aJqV/AZiZ52Yyup+KNTCZmSOhj bdJc2k8nAsDAlUOylBvD6K469KHXvzcIQfRI8nsnqbDxbi/OYcfoiWkewKXKIAjt2v8o 6c+H0C4sZ+X0rSYvQ/XdCI5UZkU/J1jAP6GRhQDTQCMLTgkoMTVpUZjISqUpbU4sHACQ +a1MOdU2X5lS0jLrCX9SpSEzw020Bs+Eg13C5lz4H2oYiDYiE+HkjbMVHmFVUF7ebwRN 0Is4ymLsNAsGL3xseI25+TTzPGQYCGMvw4rEdBtHxpvARIqxJo1sNbi17boKiMXXsIWs gPtw== X-Gm-Message-State: AOAM533yahcaOIt185y9rssgErRTdtMHZRyy6Nl5FAGfwlXQh+gp6ges +YJCpiYWN5zjM7crMIYNcfxoMPB+pOwap89yU3D9qvzq6fcG X-Google-Smtp-Source: ABdhPJxmLUFJlBuZko7pmlwkZPKedP5GcuYACUoUa2Zy2H0cXNmiEli+WfH/8GB+zWBdUJFs2osBwlHGxzDzBgSDOLWzIf9p/7hQ MIME-Version: 1.0 X-Received: by 2002:a05:6638:164f:: with SMTP id a15mr2077564jat.75.1611893477790; Thu, 28 Jan 2021 20:11:17 -0800 (PST) Date: Thu, 28 Jan 2021 20:11:17 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000028d7d005ba0232b8@google.com> Subject: INFO: rcu detected stall in wg_packet_handshake_receive_worker From: syzbot To: fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: e6806137 Merge tag 'irq_urgent_for_v5.11_rc5' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1744f4e8d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=be33d8015c9de024 dashboard link: https://syzkaller.appspot.com/bug?extid=dbb6a05624cf5064858c compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1335df9f500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=125c2ab4d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dbb6a05624cf5064858c@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...0: (1 GPs behind) idle=c9a/1/0x4000000000000000 softirq=12635/12642 fqs=2 (t=18523 jiffies g=12681 q=487) rcu: rcu_preempt kthread starved for 8264 jiffies! g12681 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:29176 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 0 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:queue_work_on+0x83/0xd0 kernel/workqueue.c:1530 Code: 31 ff 89 ee e8 1e fe 28 00 40 84 ed 74 46 e8 94 f7 28 00 31 ff 48 89 de e8 7a ff 28 00 48 85 db 75 26 e8 80 f7 28 00 41 56 9d <48> 83 c4 08 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 66 f7 28 RSP: 0018:ffffc90000ca7a78 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000 RDX: ffff888010d18000 RSI: ffffffff8149c970 RDI: 0000000000000000 RBP: ffff888033f9a000 R08: 0000000000000001 R09: ffffffff8ed3287f R10: fffffbfff1da650f R11: 0000000000000000 R12: ffffe8ffffd4bcf0 R13: ffff8880149b3c00 R14: 0000000000000293 R15: 0000000000000001 wg_queue_enqueue_per_device_and_peer drivers/net/wireguard/queueing.h:156 [inline] wg_packet_create_data drivers/net/wireguard/send.c:326 [inline] wg_packet_send_staged_packets+0xf42/0x1840 drivers/net/wireguard/send.c:396 wg_packet_send_keepalive+0x4a/0x310 drivers/net/wireguard/send.c:239 wg_receive_handshake_packet+0x930/0xb40 drivers/net/wireguard/receive.c:193 wg_packet_handshake_receive_worker+0x45/0x90 drivers/net/wireguard/receive.c:220 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches