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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,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 E6CA8C282CE for ; Tue, 4 Jun 2019 04:59:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BAE4824AC7 for ; Tue, 4 Jun 2019 04:59:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726535AbfFDE7G (ORCPT ); Tue, 4 Jun 2019 00:59:06 -0400 Received: from mail-it1-f197.google.com ([209.85.166.197]:54560 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726410AbfFDE7G (ORCPT ); Tue, 4 Jun 2019 00:59:06 -0400 Received: by mail-it1-f197.google.com with SMTP id k8so16999767itd.4 for ; Mon, 03 Jun 2019 21:59:05 -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=TTDReImnbsPUfsbHC9WPWZEbpuEYQR4VhJJHGQELGSY=; b=lpTFAbaUTgQ4CM6M5FAGkC233g0ewPx/rJbXUKA3YAwLu9jPGMLUqIkD/+NBFUAcNO YuCrgOsIaCnQGq/RnmOFjatdrAM4DpL197lweHo4vYUtZGqKgCqxL5WoF/Aot7Zm7wvp MBpMFvsNu0sDZ4pHObW4f2CtmRj4Amy/NkUdAI+EOJL5yQqWKskhUh8t/NqVS5BLPJvI 3bmgxhhfYsbD25Rq9ZzrNVpsXUZwQ8Isz5Lfo/sdXiNnTd7skL7Nh9g5Q4l5UZo30ZNM fwdmd53rPUum0841dfB62v7qbMyRIYQExO3+Rs1v2wjqybpmkRofSWrK1wgAFh5CEFtr V+3Q== X-Gm-Message-State: APjAAAWYpYQaaCeAM/wBJiBY0g8svwl2sISpXJn8whyNIQqY8536Mi/u 8yyD5Re2BBglq1bFG+TpVyMQsAxsfACxJzo/S2euuFQwntjD X-Google-Smtp-Source: APXvYqxhOTHCxmPPGUlRYIewZVdGpcmTCrQduA2Xdse33/kHj/bIPyHrvD0dun9841nI60bFqTIyH3BCmNbfMgaNz9JLeN4NfBWQ MIME-Version: 1.0 X-Received: by 2002:a02:c492:: with SMTP id t18mr14002910jam.67.1559624345428; Mon, 03 Jun 2019 21:59:05 -0700 (PDT) Date: Mon, 03 Jun 2019 21:59:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000017b026058a785790@google.com> Subject: INFO: rcu detected stall in rose_connect From: syzbot To: davem@davemloft.net, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, ralf@linux-mips.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: 0462eaac Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12fda636a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b7b54c66298f8420 dashboard link: https://syzkaller.appspot.com/bug?extid=af81c7a21a31b18bec0e 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+af81c7a21a31b18bec0e@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10499 ticks this GP) idle=5fa/1/0x4000000000000002 softirq=44473/44473 fqs=15 (t=10501 jiffies g=63393 q=282) rcu: rcu_preempt kthread starved for 10470 jiffies! g63393 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I29056 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1589 [inline] rcu_gp_kthread+0x9b2/0x18b0 kernel/rcu/tree.c:1746 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 25729 Comm: syz-executor.0 Not tainted 5.2.0-rc2+ #9 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_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:2625 [inline] rcu_sched_clock_irq.cold+0x4d1/0xbfd kernel/rcu/tree.c:2161 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1298 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33b/0xdd0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1066 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x50 kernel/kcov.c:102 Code: 48 c7 05 8e 89 f5 08 00 00 00 00 e9 a4 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 65 48 8b 04 25 c0 fd 01 00 <65> 8b 15 b0 57 91 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 83 RSP: 0018:ffff888062d17c00 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: ffff8880875ce680 RBX: dffffc0000000000 RCX: ffffffff864bdd76 RDX: 0000000000000001 RSI: ffffffff864bdd14 RDI: 0000000000000004 RBP: ffff888062d17c00 R08: ffff8880875ce680 R09: ffffed100c5a2f70 R10: ffffed100c5a2f6f R11: 0000000000000003 R12: ffff88808ce48600 R13: 0000000000000001 R14: ffff888216685300 R15: 0000000000000000 rose_find_socket+0x54/0x120 net/rose/af_rose.c:281 rose_new_lci net/rose/af_rose.c:302 [inline] rose_new_lci+0xca/0x140 net/rose/af_rose.c:296 rose_connect+0x3b8/0x1510 net/rose/af_rose.c:776 __sys_connect+0x264/0x330 net/socket.c:1840 __do_sys_connect net/socket.c:1851 [inline] __se_sys_connect net/socket.c:1848 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1848 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007eff2ff64c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000000000040 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007eff2ff656d4 R13: 00000000004bf7f6 R14: 00000000004d0d38 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#status for how to communicate with syzbot.