Date:   Mon, 24 Sep 2018 14:00:04 +0200
From:   Ortwin Glück <odi@....ch>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org
Subject: r8169 hang on 4.18

Hi,

Stable kernel has stability problems on r8169 that were not present in 4.17.3:

[    0.000000] Linux version 4.18.8 (kbuild@...w) (gcc version 7.3.0 (Gentoo 7.3.0-r3 p1.4)) #70 SMP 
PREEMPT Mon Sep 17 17:56:57 CEST 2018
[    0.000000] Command line: BOOT_IMAGE=/boot/linux-4.18.8 root=LABEL=ROOT ro rootfstype=ext4 
net.ifnames=0 pci=nomsi

[    1.772849] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    1.772852] r8169 0000:07:00.0: can't disable ASPM; OS doesn't have ASPM control
[    1.784948] r8169 0000:07:00.0 eth4: RTL8168h/8111h, 50:9a:4c:2e:92:be, XID 54100800, IRQ 16
[    1.784949] r8169 0000:07:00.0 eth4: jumbo features [frames: 9200 bytes, tx checksumming: ko]

We saw the interface unresponsive twice during the last 3 days with:

[Mon Sep 24 11:35:56 2018] ------------[ cut here ]------------
[Mon Sep 24 11:35:56 2018] NETDEV WATCHDOG: wan (r8169): transmit queue 0 timed out
[Mon Sep 24 11:35:56 2018] WARNING: CPU: 2 PID: 0 at net/sched/sch_generic.c:461 
dev_watchdog+0x215/0x220
[Mon Sep 24 11:35:56 2018] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.18.8 #70
[Mon Sep 24 11:35:56 2018] Hardware name: Dell Inc. OptiPlex 3050/0W0CHX, BIOS 1.6.5 09/09/2017
[Mon Sep 24 11:35:56 2018] RIP: 0010:dev_watchdog+0x215/0x220
[Mon Sep 24 11:35:56 2018] Code: 49 63 4c 24 e8 eb 8c 4c 89 ef c6 05 1a 19 ca 00 01 e8 5f 52 fd ff 
89 d9 4c 89 ee 48 c7 c7 78 ab 67 89 48 89 c2 e8 1b 2b 49 ff <0f> 0b eb be 0f 1f 80 00 00 00 00 41 57 
45 89 cf 41 56 49 89 d6 41
[Mon Sep 24 11:35:56 2018] RSP: 0018:ffff96f05dd03e98 EFLAGS: 00010282
[Mon Sep 24 11:35:56 2018] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
[Mon Sep 24 11:35:56 2018] RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff96f05dd15350
[Mon Sep 24 11:35:56 2018] RBP: ffff96f0462ee41c R08: 0000000000000001 R09: 000000000000133d
[Mon Sep 24 11:35:56 2018] R10: 0000000000000202 R11: 0000000000000000 R12: ffff96f0462ee438
[Mon Sep 24 11:35:56 2018] R13: ffff96f0462ee000 R14: 0000000000000001 R15: ffff96f0455eaa80
[Mon Sep 24 11:35:56 2018] FS:  0000000000000000(0000) GS:ffff96f05dd00000(0000) knlGS:0000000000000000
[Mon Sep 24 11:35:56 2018] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mon Sep 24 11:35:56 2018] CR2: 000055c9498766e0 CR3: 00000000bb80a006 CR4: 00000000003606e0
[Mon Sep 24 11:35:56 2018] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[Mon Sep 24 11:35:56 2018] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[Mon Sep 24 11:35:56 2018] Call Trace:
[Mon Sep 24 11:35:56 2018]  <IRQ>
[Mon Sep 24 11:35:56 2018]  ? pfifo_fast_reset+0x130/0x130
[Mon Sep 24 11:35:56 2018]  ? pfifo_fast_reset+0x130/0x130
[Mon Sep 24 11:35:56 2018]  call_timer_fn+0x11/0x70
[Mon Sep 24 11:35:56 2018]  expire_timers+0x8e/0xa0
[Mon Sep 24 11:35:56 2018]  run_timer_softirq+0xb9/0x160
[Mon Sep 24 11:35:56 2018]  ? __hrtimer_run_queues+0x135/0x1a0
[Mon Sep 24 11:35:56 2018]  ? hw_breakpoint_pmu_read+0x10/0x10
[Mon Sep 24 11:35:56 2018]  ? ktime_get+0x39/0x90
[Mon Sep 24 11:35:56 2018]  ? lapic_next_event+0x20/0x20
[Mon Sep 24 11:35:56 2018]  __do_softirq+0xcb/0x1f8
[Mon Sep 24 11:35:56 2018]  irq_exit+0xa9/0xb0
[Mon Sep 24 11:35:56 2018]  smp_apic_timer_interrupt+0x59/0x90
[Mon Sep 24 11:35:56 2018]  apic_timer_interrupt+0xf/0x20
[Mon Sep 24 11:35:56 2018]  </IRQ>
[Mon Sep 24 11:35:56 2018] RIP: 0010:cpuidle_enter_state+0x129/0x200
[Mon Sep 24 11:35:56 2018] Code: 45 00 89 c3 e8 d8 3b 55 ff 65 8b 3d b1 eb 45 77 e8 8c 3a 55 ff 31 
ff 49 89 c4 e8 72 43 55 ff fb 48 ba cf f7 53 e3 a5 9b c4 20 <4c> 89 e1 4c 29 e9 48 89 c8 48 c1 f9 3f 
48 f7 ea b8 ff ff ff 7f 48
[Mon Sep 24 11:35:56 2018] RSP: 0018:ffff9a93c06e7ea8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[Mon Sep 24 11:35:56 2018] RAX: ffff96f05dd1f800 RBX: 0000000000000003 RCX: 000000000000001f
[Mon Sep 24 11:35:56 2018] RDX: 20c49ba5e353f7cf RSI: 00000000258f0602 RDI: 0000000000000000
[Mon Sep 24 11:35:56 2018] RBP: ffff96f05dd25ee0 R08: 00000000000002b4 R09: 00000000ffffffff
[Mon Sep 24 11:35:56 2018] R10: ffff9a93c06e7e90 R11: 0000000000000142 R12: 00012ec849a182b9
[Mon Sep 24 11:35:56 2018] R13: 00012ec8499ddf88 R14: 0000000000000003 R15: 0000000000000000
[Mon Sep 24 11:35:56 2018]  ? cpuidle_enter_state+0x11e/0x200
[Mon Sep 24 11:35:56 2018]  do_idle+0x1c0/0x200
[Mon Sep 24 11:35:56 2018]  cpu_startup_entry+0x6a/0x70
[Mon Sep 24 11:35:56 2018]  start_secondary+0x18a/0x1c0
[Mon Sep 24 11:35:56 2018]  secondary_startup_64+0xa5/0xb0
[Mon Sep 24 11:35:56 2018] ---[ end trace 327bd9c035abe307 ]---

This is the built-in ethernet port on a Dell main board:
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express 
Gigabit Ethernet Controller [10ec:8168] (rev 15)
         Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1028:07a3]
         Flags: bus master, fast devsel, latency 0, IRQ 16
         I/O ports at e000 [size=256]
         Memory at f7404000 (64-bit, non-prefetchable) [size=4K]
         Memory at f7400000 (64-bit, non-prefetchable) [size=16K]
         Capabilities: [40] Power Management version 3
         Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
         Capabilities: [70] Express Endpoint, MSI 01
         Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
         Capabilities: [100] Advanced Error Reporting
         Capabilities: [140] Virtual Channel
         Capabilities: [160] Device Serial Number 01-00-00-00-68-4c-e0-00
         Capabilities: [170] Latency Tolerance Reporting
         Capabilities: [178] L1 PM Substates
         Kernel driver in use: r8169

The box has an extra 4-way ethernet card that uses the same driver. We had to set pci=nomsi because 
the card frequently behaved erratic with msi on.

Thanks,

Ortwin

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