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 C623EC0650F for ; Mon, 5 Aug 2019 15:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9522820B1F for ; Mon, 5 Aug 2019 15:28:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729289AbfHEP2I (ORCPT ); Mon, 5 Aug 2019 11:28:08 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:54342 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728801AbfHEP2I 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2002:a5d:8a10:: with SMTP id w16mr28701728iod.175.1565018887012; Mon, 05 Aug 2019 08:28:07 -0700 (PDT) Date: Mon, 05 Aug 2019 08:28:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d3c7e0058f605a53@google.com> Subject: INFO: rcu detected stall in __do_softirq From: syzbot To: bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, nstange@suse.de, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org, yakui.zhao@intel.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 882e8691 Add linux-next specific files for 20190801 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17fc120c600000 kernel config: https://syzkaller.appspot.com/x/.config?x=466b331af3f34e94 dashboard link: https://syzkaller.appspot.com/bug?extid=6593c6b8c8b66a07cd98 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16b216b2600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6593c6b8c8b66a07cd98@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 ticks this GP) idle=b66/1/0x4000000000000004 softirq=28179/28180 fqs=1 (t=29639 jiffies g=24749 q=37154) NMI backtrace for cpu 1 CPU: 1 PID: 16869 Comm: syz-executor.5 Not tainted 5.3.0-rc2-next-20190801 #57 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:1724 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1299 __run_hrtimer kernel/time/hrtimer.c:1493 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1555 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1617 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:ffs arch/x86/include/asm/bitops.h:297 [inline] RIP: 0010:__do_softirq+0x227/0x98c kernel/softirq.c:280 Code: c7 c0 b0 f4 d2 88 48 c1 e8 03 42 80 3c 30 00 0f 85 b1 06 00 00 48 83 3d 96 f2 72 01 00 0f 84 d6 05 00 00 fb 66 0f 1f 44 00 00 ff ff ff ff 48 c7 45 c8 00 91 c0 88 0f bc 45 d4 83 c0 01 89 45 RSP: 0018:ffff8880ae909f18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5e96 RBX: ffff88809aa061c0 RCX: 1ffffffff134c0be RDX: 0000000000000000 RSI: ffffffff8177a50e RDI: ffffffff876001fc RBP: ffff8880ae909f98 R08: ffff88809aa061c0 R09: 0000000000000000 R10: ffffffff89e49050 R11: 0000000000000001 R12: ffff888099137938 R13: 0000000000000028 R14: dffffc0000000000 R15: 0000000000000000 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0x12c/0x200 arch/x86/kernel/irq.c:259 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:605 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline] RIP: 0010:test_bit include/asm-generic/bitops-instrumented.h:238 [inline] RIP: 0010:kvm_test_request include/linux/kvm_host.h:1207 [inline] RIP: 0010:kvm_check_request+0x30/0x70 include/linux/kvm_host.h:1217 Code: 41 55 41 54 49 89 f4 53 4d 8d 74 24 30 89 fb e8 f6 13 67 00 be 08 00 00 00 4c 89 f7 0f b6 db e8 36 e2 a1 00 49 0f a3 5c 24 30 <41> 0f 92 c5 31 ff 44 89 ee e8 12 15 67 00 45 84 ed 75 11 e8 c8 13 RSP: 0018:ffff8880991379e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd7 RAX: 0000000000000001 RBX: 000000000000001f RCX: ffffffff810b0e4a RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888093c409f0 RBP: ffff888099137a00 R08: 1ffff1101278813e R09: ffffed101278813f R10: ffffed101278813e R11: ffff888093c409f7 R12: ffff888093c409c0 R13: ffff888093c409c0 R14: ffff888093c409f0 R15: ffff888093c409f0 vcpu_enter_guest+0x32a6/0x5e90 arch/x86/kvm/x86.c:7866 vcpu_run arch/x86/kvm/x86.c:8151 [inline] kvm_arch_vcpu_ioctl_run+0x464/0x1750 arch/x86/kvm/x86.c:8359 kvm_vcpu_ioctl+0x4dc/0xfd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2754 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 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:00007fa754e29c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa754e2a6d4 R13: 00000000004c2bcf R14: 00000000004d6150 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches