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,URIBL_BLOCKED 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 0E906C43381 for ; Wed, 27 Mar 2019 18:31:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF18F204FD for ; Wed, 27 Mar 2019 18:31:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391827AbfC0SbJ (ORCPT ); Wed, 27 Mar 2019 14:31:09 -0400 Received: from mail-it1-f199.google.com ([209.85.166.199]:39036 "EHLO mail-it1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391643AbfC0SbI (ORCPT ); Wed, 27 Mar 2019 14:31:08 -0400 Received: by mail-it1-f199.google.com with SMTP id e124so827480ita.4 for ; Wed, 27 Mar 2019 11:31:07 -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=uryPLxACeQUy+emw4YowAzfgEUIoTGYQCrCWVFd0hPg=; b=dY5KteozVIAAaa81gLheKAHhZCIVEjsogtj0Kt9iMXM7KvrUkZGONZJWeGMc/Vdp7A rauccFxL/HAUMFZNatUrFX6uO/ZVZDJ4ecVBziInYjL5t+R4HsbGoW9e5XUi4RnLjVas zLUHFdc+s0s2QKJUNRqTE6Wr+DZE5SyBxOoxCpTTJzx71DHdks/JPVS34LZAYebVjbEI GYTuRrLYmwgp7AWDc8EsV4AcHEsF6UPDzBHE6RmWNjFgWwtFOJcPlqdlnjEaQJcb1Qv8 SH13mnVXgA1lZFFv4pgKvAQVBmt4M2lPouMpZmf/qmKdWTm/YlZPmV17Vwg4C90tTP+m MDJA== X-Gm-Message-State: APjAAAVQ3cdiX9v6Gw6AvJ7aM5ZjQVX+JlJ2VSQbcKoHUOi02zn6TwH4 z8kRHSVCiDTf5Z26NLe5ABSej92L3OLO4KHaGXNxDZEh+wrf X-Google-Smtp-Source: APXvYqyMVkPuEyDq9MbiwaLhUHB9CI5mfak9ojgaBuvgHWcWGOa/YwXD1MfCwaZgc6RXh3MBWAFpm49+VW9KLyWXcndJzvWC/PID MIME-Version: 1.0 X-Received: by 2002:a05:660c:288:: with SMTP id s8mr941828itl.25.1553711466975; Wed, 27 Mar 2019 11:31:06 -0700 (PDT) Date: Wed, 27 Mar 2019 11:31:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000012a28e058517a481@google.com> Subject: INFO: rcu detected stall in sys_bpf From: syzbot To: ast@kernel.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-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, xdp-newbies@vger.kernel.org, yhs@fb.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: ab8bba4e Add linux-next specific files for 20190326 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=147da22f200000 kernel config: https://syzkaller.appspot.com/x/.config?x=8b5e4ab01fbe59f3 dashboard link: https://syzkaller.appspot.com/bug?extid=c70685d9eac9589eaffc compiler: gcc (GCC) 9.0.0 20181231 (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+c70685d9eac9589eaffc@syzkaller.appspotmail.com protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=4d6/1/0x4000000000000002 softirq=15531/15535 fqs=1 rcu: (t=10500 jiffies g=12661 q=236) rcu: rcu_preempt kthread starved for 10498 jiffies! g12661 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29176 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1971 [inline] rcu_gp_kthread+0x962/0x17b0 kernel/rcu/tree.c:2128 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 10138 Comm: syz-executor.4 Not tainted 5.1.0-rc2-next-20190326 #11 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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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.c:1223 print_cpu_stall kernel/rcu/tree.c:1360 [inline] check_cpu_stall kernel/rcu/tree.c:1434 [inline] rcu_pending kernel/rcu/tree.c:3103 [inline] rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1272 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:bpf_prog_d4faa897062613d4+0x534/0x1000 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 55 <48> 89 e5 48 81 ec 28 00 00 00 48 83 ed 28 48 89 5d 00 4c 89 6d 08 RSP: 0018:ffff88804e95fac0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffffa0008533 RBX: ffff88804e95fba8 RCX: ffffc9000e663000 RDX: 0000000000040000 RSI: ffffc90001965038 RDI: ffff88804e95fc68 RBP: ffff88804e95fbd0 R08: ffff888096eda6c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000ffffffff R14: ffffc90001965000 R15: 0000000003d7c302 bpf_prog_test_run_xdp+0x24f/0x4c0 net/bpf/test_run.c:235 bpf_prog_test_run kernel/bpf/syscall.c:1969 [inline] __do_sys_bpf+0x15c2/0x3e50 kernel/bpf/syscall.c:2728 __se_sys_bpf kernel/bpf/syscall.c:2672 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2672 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f74d2a2dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000028 RSI: 0000000020000240 RDI: 000000000000000a RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74d2a2e6d4 R13: 00000000004be3c5 R14: 00000000004cea20 R15: 00000000ffffffff net_ratelimit: 2 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 --- 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.