Steps to reproduce:
1. Boot, run a torrent client actively downloading/uploading data
Expected: no panic
Instead: kernel panic eventually happens, then after a while device becomes
inaccessible via network.
Relevant snippet from journal:
������ 01 16:00:55 server kernel: ------------[ cut here ]------------
������ 01 16:00:55 server kernel: NETDEV WATCHDOG: enp2s0 (r8169): transmit queue
0 timed out
������ 01 16:00:55 server kernel: WARNING: CPU: 2 PID: 0 at
net/sched/sch_generic.c:461 dev_watchdog+0x21a/0x220
������ 01 16:00:55 server kernel: Modules linked in: fuse rfcomm nf_log_ipv6
xt_comment nf_log_ipv4 nf_log_common xt_LOG xt_limit af_packet iscsi_ibft
iscsi_boot_sysfs bnep msr ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6
nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 xt_pkttype xt_tcpudp iptable_filter
bpfilter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast
nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack
ip6table_filter ip6_tables x_tables nls_iso8859_1 nls_cp437 vfat fat
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic arc4 intel_rapl
x86_pkg_temp_thermal snd_hda_intel intel_powerclamp snd_hda_codec iwldvm
snd_hda_core snd_hwdep btusb snd_pcm coretemp mac80211 btrtl btbcm snd_timer
gpio_ich btintel snd iwlwifi kvm soundcore irqbypass bluetooth iTCO_wdt r8169
mei_me iTCO_vendor_support
������ 01 16:00:55 server kernel: i2c_i801 cfg80211 mei lpc_ich pcc_cpufreq
crct10dif_pclmul pcspkr crc32_pclmul ecdh_generic mii rfkill
ghash_clmulni_intel ie31200_edac thermal fan cryptd nfsd auth_rpcgss nfs_acl
lockd grace sunrpc xfs libcrc32c crc32c_intel i915 sr_mod cdrom serio_raw
ehci_pci ehci_hcd i2c_algo_bit drm_kms_helper xhci_pci xhci_hcd syscopyarea
sysfillrect sysimgblt fb_sys_fops video drm button usbcore sg dm_multipath
dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua efivarfs
������ 01 16:00:55 server kernel: CPU: 2 PID: 0 Comm: swapper/2 Not tainted
4.18.5-1-default #1 openSUSE Tumbleweed (unreleased)
������ 01 16:00:55 server kernel: Hardware name: Gigabyte Technology Co., Ltd. To
be filled by O.E.M./Z77N-WIFI, BIOS F3 05/29/2013
������ 01 16:00:55 server kernel: RIP: 0010:dev_watchdog+0x21a/0x220
������ 01 16:00:55 server kernel: Code: 49 63 4c 24 e8 eb 8c 4c 89 ef c6 05 d0 97
c2 00 01 e8 4a fe fc ff 89 d9 4c 89 ee 48 c7 c7 80 10 11 a4 48 89 c2 e8 20 26
98 ff <0f> 0b eb be 66 90 0f 1f 44 00 00 41 57 45 89 cf 41 56 49 89 d6 41
������ 01 16:00:55 server kernel: RSP: 0018:ffff99375f303e98 EFLAGS: 00010292
������ 01 16:00:55 server kernel: RAX: 000000000000003b RBX: 0000000000000000 RCX:
0000000000000000
������ 01 16:00:55 server kernel: RDX: 0000000000040400 RSI: 00000000000000f6 RDI:
0000000000000300
������ 01 16:00:55 server kernel: RBP: ffff9937534f245c R08: 0000000000000001 R09:
000000000000037b
������ 01 16:00:55 server kernel: R10: 0000000000000004 R11: 0000000000000000 R12:
ffff9937534f2478
������ 01 16:00:55 server kernel: R13: ffff9937534f2000 R14: 0000000000000001 R15:
ffff993751d48480
������ 01 16:00:55 server kernel: FS: 0000000000000000(0000)
GS:ffff99375f300000(0000) knlGS:0000000000000000
������ 01 16:00:55 server kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
������ 01 16:00:55 server kernel: CR2: 00007fd329765000 CR3: 000000008620a006 CR4:
00000000001606e0
������ 01 16:00:55 server kernel: Call Trace:
������ 01 16:00:55 server kernel: <IRQ>
������ 01 16:00:55 server kernel: ? pfifo_fast_dequeue+0x160/0x160
������ 01 16:00:55 server kernel: call_timer_fn+0x2b/0x150
������ 01 16:00:55 server kernel: ? pfifo_fast_dequeue+0x160/0x160
������ 01 16:00:55 server kernel: run_timer_softirq+0x3c3/0x3f0
������ 01 16:00:55 server kernel: ? _raw_spin_lock_irq+0x15/0x40
������ 01 16:00:55 server kernel: ? __hrtimer_run_queues+0x100/0x2a0
������ 01 16:00:55 server kernel: ? recalibrate_cpu_khz+0x10/0x10
������ 01 16:00:55 server kernel: ? ktime_get+0x36/0xa0
������ 01 16:00:55 server kernel: __do_softirq+0x111/0x370
������ 01 16:00:55 server kernel: irq_exit+0xca/0xd0
������ 01 16:00:55 server kernel: smp_apic_timer_interrupt+0x74/0x160
������ 01 16:00:55 server kernel: apic_timer_interrupt+0xf/0x20
������ 01 16:00:55 server kernel: </IRQ>
������ 01 16:00:55 server kernel: RIP: 0010:cpuidle_enter_state+0xbc/0x2e0
������ 01 16:00:55 server kernel: Code: 80 7c 24 03 00 74 17 9c 58 0f 1f 44 00 00
f6 c4 02 0f 85 00 02 00 00 31 ff e8 30 f3 a8 ff e8 db 10 af ff fb 66 0f 1f 44
00 00 <48> b8 ff ff ff ff f3 01 00 00 4c 29 f3 ba ff ff ff 7f 48 39 c3 7f
������ 01 16:00:55 server kernel: RSP: 0018:ffffb1b7c0cebeb0 EFLAGS: 00000202
ORIG_RAX: ffffffffffffff13
������ 01 16:00:55 server kernel: RAX: 0000000000000001 RBX: 0000003ea2d92c8a RCX:
000000000000001f
������ 01 16:00:55 server kernel: RDX: 0000003ea2d92c8a RSI: 0000000000022980 RDI:
0000000000000000
������ 01 16:00:55 server kernel: RBP: 0000000000000004 R08: 000000df6ad921de R09:
0000000000000f48
������ 01 16:00:55 server kernel: R10: 0000000000002042 R11: ffff99375f3220a8 R12:
ffffd1b7bfd10a30
������ 01 16:00:55 server kernel: R13: ffffffffa42dae98 R14: 0000003ea1c90aad R15:
0000000000000000
������ 01 16:00:55 server kernel: do_idle+0x21d/0x270
������ 01 16:00:55 server kernel: cpu_startup_entry+0x5f/0x70
������ 01 16:00:55 server kernel: start_secondary+0x1a0/0x1e0
������ 01 16:00:55 server kernel: secondary_startup_64+0xa5/0xb0
������ 01 16:00:55 server kernel: ---[ end trace 08f8f757effbd008 ]---
������ 01 16:00:55 server kernel: r8169 0000:02:00.0 enp2s0: link up
������ 01 16:01:58 server wickedd-dhcp4[1146]: enp2s0: Committed DHCPv4 lease with
address 192.168.1.250 (lease time 600 sec, renew in 300 sec, rebind in 525 sec)
������ 01 16:01:58 server wickedd[1171]: route ipv4 0.0.0.0/0 via 192.168.1.1 dev
enp2s0#2 type unicast table main scope universe protocol dhcp covered by a
ipv4:dhcp lease
������ 01 16:02:20 server kernel: r8169 0000:02:00.0 enp2s0: link up
������ 01 16:02:39 server kernel: r8169 0000:02:00.0 enp2s0: link up
������ 01 16:05:47 server kernel: r8169 0000:02:00.0 enp2s0: link up
������ 01 16:05:53 server kernel: r8169 0000:02:00.0 enp2s0: link up
Issue is worked around now by booting unaffected kernel v4.17.15.