Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752191AbdFLINs (ORCPT ); Mon, 12 Jun 2017 04:13:48 -0400 Received: from mail-yw0-f170.google.com ([209.85.161.170]:34172 "EHLO mail-yw0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750730AbdFLINq (ORCPT ); Mon, 12 Jun 2017 04:13:46 -0400 MIME-Version: 1.0 In-Reply-To: <20170612064232.GA14559@kroah.com> References: <20170612064232.GA14559@kroah.com> From: Dison River Date: Mon, 12 Jun 2017 16:13:45 +0800 Message-ID: Subject: Re: WARNING in dev_watchdog To: Greg KH Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, security@kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5819 Lines: 126 Sorry,this WARNING is not reproducible.And I don't have PoC for this bug. 2017-06-12 14:42 GMT+08:00 Greg KH : > On Mon, Jun 12, 2017 at 02:37:22PM +0800, Dison River wrote: >> Hi: >> I've got the following error report while fuzzing the kernel with >> syzkaller on linux-4.11.0-rc3. >> >> log: >> WARNING: CPU: 2 PID: 0 at net/sched/sch_generic.c:316 >> dev_watchdog+0x648/0x770 net/sched/sch_generic.c:315 >> NETDEV WATCHDOG: eth0 (e1000): transmit queue 0 timed out >> Kernel panic - not syncing: panic_on_warn set ... >> >> CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.11.0-rc3 #2 >> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> Call Trace: >> >> __dump_stack lib/dump_stack.c:16 [inline] >> dump_stack+0x95/0xe8 lib/dump_stack.c:52 >> panic+0x1ae/0x386 kernel/panic.c:180 >> __warn+0x1c4/0x1e0 kernel/panic.c:541 >> warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:564 >> dev_watchdog+0x648/0x770 net/sched/sch_generic.c:315 >> call_timer_fn+0x15b/0x5e0 kernel/time/timer.c:1268 >> expire_timers kernel/time/timer.c:1307 [inline] >> __run_timers kernel/time/timer.c:1601 [inline] >> run_timer_softirq+0x5c7/0x1140 kernel/time/timer.c:1614 >> __do_softirq+0x217/0x8b7 kernel/softirq.c:284 >> invoke_softirq kernel/softirq.c:364 [inline] >> irq_exit+0x198/0x1d0 kernel/softirq.c:405 >> exiting_irq arch/x86/include/asm/apic.h:657 [inline] >> smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:962 >> apic_timer_interrupt+0x90/0xa0 arch/x86/entry/entry_64.S:707 >> RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:53 [inline] >> RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:95 [inline] >> RIP: 0010:default_idle+0x1f/0x2d0 arch/x86/kernel/process.c:275 >> RSP: 0018:ffff88006dee7e78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 >> RAX: 0000000000000007 RBX: ffff88006de9db40 RCX: 0000000000000000 >> RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88006de9e314 >> RBP: ffff88006dee7e98 R08: 0000000000000040 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83efc9b8 >> R13: ffff88006de9db40 R14: 0000000000000002 R15: ffff88006de9db40 >> >> arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:266 >> default_idle_call+0x36/0x50 kernel/sched/idle.c:97 >> cpuidle_idle_call kernel/sched/idle.c:155 [inline] >> do_idle+0x20b/0x2d0 kernel/sched/idle.c:244 >> cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:346 >> start_secondary+0x245/0x2d0 arch/x86/kernel/smpboot.c:275 >> start_cpu+0x14/0x14 arch/x86/kernel/head_64.S:306 >> Dumping ftrace buffer: >> (ftrace buffer empty) >> Kernel Offset: disabled >> Rebooting in 86400 seconds.. >> >> >> report : >> >> >> syzkaller login: [ 37.041894] ------------[ cut here ]------------ >> [ 37.042430] WARNING: CPU: 2 PID: 0 at net/sched/sch_generic.c:316 >> dev_watchdog+0x648/0x770 >> [ 37.042978] NETDEV WATCHDOG: eth0 (e1000): transmit queue 0 timed out >> [ 37.043405] Kernel panic - not syncing: panic_on_warn set ... >> [ 37.043405] >> [ 37.043888] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.11.0-rc3 #2 >> [ 37.044297] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), >> BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 >> [ 37.044909] Call Trace: >> [ 37.045080] >> [ 37.045226] dump_stack+0x95/0xe8 >> [ 37.045453] ? dev_watchdog+0x648/0x770 >> [ 37.045712] panic+0x1ae/0x386 >> [ 37.045924] ? percpu_up_read_preempt_enable.constprop.53+0xae/0xae >> [ 37.046342] ? dev_watchdog+0x648/0x770 >> [ 37.046605] ? vprintk_default+0x28/0x30 >> [ 37.046873] ? dev_watchdog+0x648/0x770 >> [ 37.047114] __warn+0x1c4/0x1e0 >> [ 37.047820] warn_slowpath_fmt+0xac/0xd0 >> [ 37.048467] ? __warn+0x1e0/0x1e0 >> [ 37.048698] ? dev_watchdog+0x125/0x770 >> [ 37.048963] dev_watchdog+0x648/0x770 >> [ 37.049218] call_timer_fn+0x15b/0x5e0 >> [ 37.049475] ? call_timer_fn+0xcc/0x5e0 >> [ 37.049739] ? qdisc_rcu_free+0x110/0x110 >> [ 37.050014] ? process_timeout+0x20/0x20 >> [ 37.050285] ? trace_hardirqs_on_caller+0x19e/0x580 >> [ 37.053699] ? qdisc_rcu_free+0x110/0x110 >> [ 37.054931] ? qdisc_rcu_free+0x110/0x110 >> [ 37.055296] run_timer_softirq+0x5c7/0x1140 >> [ 37.055949] ? msleep_interruptible+0x170/0x170 >> [ 37.056671] ? lapic_timer_shutdown+0x3d/0x50 >> [ 37.057268] ? clockevents_switch_state+0xe3/0x320 >> [ 37.057837] __do_softirq+0x217/0x8b7 >> [ 37.058097] irq_exit+0x198/0x1d0 >> [ 37.058326] smp_apic_timer_interrupt+0x76/0xa0 >> [ 37.058634] apic_timer_interrupt+0x90/0xa0 >> [ 37.058921] RIP: 0010:default_idle+0x1f/0x2d0 >> [ 37.059217] RSP: 0018:ffff88006dee7e78 EFLAGS: 00000246 ORIG_RAX: >> ffffffffffffff10 >> [ 37.059702] RAX: 0000000000000007 RBX: ffff88006de9db40 RCX: 0000000000000000 >> [ 37.060179] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88006de9e314 >> [ 37.065968] RBP: ffff88006dee7e98 R08: 0000000000000040 R09: 0000000000000000 >> [ 37.066451] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83efc9b8 >> [ 37.073921] R13: ffff88006de9db40 R14: 0000000000000002 R15: ffff88006de9db40 >> [ 37.074405] >> [ 37.074767] ? default_idle+0x1d/0x2d0 >> [ 37.075026] arch_cpu_idle+0xa/0x10 >> [ 37.075266] default_idle_call+0x36/0x50 >> [ 37.075534] do_idle+0x20b/0x2d0 >> [ 37.075815] cpu_startup_entry+0x18/0x20 >> [ 37.076084] start_secondary+0x245/0x2d0 >> [ 37.076352] start_cpu+0x14/0x14 >> [ 37.077025] Dumping ftrace buffer: >> [ 37.077308] (ftrace buffer empty) >> [ 37.077555] Kernel Offset: disabled >> [ 37.078786] Rebooting in 86400 seconds.. > > Any hints as to exactly what you were doing at the time, and a > reproducer so we could try to test this? > > thanks, > > greg k-h