Repro steps for my computer:
1.) I use internet via iPhone USB tethering for a while, say 10 mins or less.
2.) I notice there is no internet connection anymore.
3.) I see these errors at syslog.
*Re-plugging USB to same USB port changes nothing but the other ports are working for tethering.
*Using different port works for a while, than same things happening. I can connect to internet until all USB ports disconnects the iPhone.
*Restart solving the issue.
*I have been encountering with this issue since a month or so.
*I have iPhone 8 with iOS 11.2.2
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768522] NETDEV WATCHDOG: enp0s20f0u1c4i2 (ipheth): transmit queue 0 timed out
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768543] ------------[ cut here ]------------
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768555] WARNING: CPU: 3 PID: 2277 at /build/linux-4LIBhY/linux-4.13.0/net/sched/sch_generic.c:316 dev_watchdog+0x21e/0x230
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768557] Modules linked in: ipheth ccm thunderbolt arc4 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep binfmt_misc nls_iso8859_1 snd_hda_codec_hdmi hid_multitouch dell_wmi wmi_bmof snd_hda_codec_realtek snd_hda_codec_generic dell_laptop dell_smbios dcdbas snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm intel_rapl ath10k_pci x86_pkg_temp_thermal intel_powerclamp ath10k_core uvcvideo videobuf2_vmalloc snd_seq_midi videobuf2_memops snd_seq_midi_event videobuf2_v4l2 ath kvm_intel videobuf2_core kvm videodev snd_rawmidi media btusb irqbypass intel_cstate nouveau mac80211 intel_rapl_perf btrtl rtsx_pci_ms cfg80211 memstick mxm_wmi snd_seq ttm snd_seq_device snd_timer input_leds snd joydev serio_raw soundcore mei_me idma64 mei shpchp virt_dma processor_thermal_device intel_soc_dts_iosf
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768639] intel_lpss_pci intel_pch_thermal hci_uart btbcm serdev btqca int3403_thermal btintel bluetooth wmi ecdh_generic dell_smo8800 intel_lpss_acpi int3402_thermal intel_lpss int340x_thermal_zone intel_hid mac_hid sparse_keymap int3400_thermal acpi_thermal_rel acpi_pad acpi_als kfifo_buf industrialio ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat coretemp nf_conntrack_ftp parport_pc nf_conntrack ppdev libcrc32c iptable_filter lp parport ip_tables x_tables autofs4 algif_skcipher af_alg dm_crypt nvidia_drm(POE) nvidia_modeset(POE)
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768711] i915 crct10dif_pclmul nvidia(POE) crc32_pclmul ghash_clmulni_intel pcbc rtsx_pci_sdmmc i2c_algo_bit aesni_intel aes_x86_64 crypto_simd glue_helper drm_kms_helper cryptd syscopyarea psmouse sysfillrect sysimgblt fb_sys_fops nvme ahci drm nvme_core rtsx_pci libahci i2c_hid hid pinctrl_sunrisepoint video pinctrl_intel
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768749] CPU: 3 PID: 2277 Comm: compiz Tainted: P OE 4.13.0-25-generic #29-Ubuntu
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768751] Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS 1.6.1 12/11/2017
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768753] task: ffff8f86498a8000 task.stack: ffffa7ae054d4000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768760] RIP: 0010:dev_watchdog+0x21e/0x230
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768762] RSP: 0000:ffff8f867dcc3e48 EFLAGS: 00010286
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768766] RAX: 0000000000000045 RBX: 0000000000000000 RCX: 0000000000000000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768768] RDX: 0000000000000000 RSI: ffff8f867dcd3578 RDI: ffff8f867dcd3578
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768770] RBP: ffff8f867dcc3e78 R08: 0000000000000001 R09: 00000000000004a3
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768772] R10: ffff8f867dcc3e18 R11: 0000000000000000 R12: 0000000000000001
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768773] R13: 0000000000000003 R14: ffff8f853533c000 R15: ffff8f86604e8e80
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768776] FS: 00007f18f8564dc0(0000) GS:ffff8f867dcc0000(0000) knlGS:0000000000000000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768778] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768781] CR2: 00001207ba360510 CR3: 0000000686cb4004 CR4: 00000000003606e0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768786] Call Trace:
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768789] <IRQ>
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768798] ? qdisc_rcu_free+0x50/0x50
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768803] call_timer_fn+0x33/0x130
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768807] run_timer_softirq+0x40f/0x470
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768811] ? timerqueue_add+0x57/0x80
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768816] ? ktime_get+0x40/0xa0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768821] __do_softirq+0xde/0x2a5
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768828] irq_exit+0xb6/0xc0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768832] smp_apic_timer_interrupt+0x68/0x90
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768835] apic_timer_interrupt+0x9f/0xb0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768838] </IRQ>
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768841] RIP: 0033:0x7f18f77a7404
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768843] RSP: 002b:00007ffcf3ff6a10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768846] RAX: 0000000000000000 RBX: 0000562ed8d39e70 RCX: 0000000000000000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768848] RDX: 0000562ed98c6a10 RSI: 0000000000000000 RDI: 0000562ed90fcff0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768850] RBP: 0000562ed8d39e70 R08: 00007ffcf3ff69e0 R09: 0000000000000000
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768851] R10: 0000000000000000 R11: 0000562ed7db82b0 R12: 0000562ed9a1fb80
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768853] R13: 00007ffcf3ff6b80 R14: 00007ffcf3ff6b80 R15: 0000562ed86421d0
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768857] Code: 63 8e 60 04 00 00 eb 95 4c 89 f7 c6 05 85 75 c1 00 01 e8 66 6e fd ff 89 d9 48 89 c2 4c 89 f6 48 c7 c7 70 e2 75 b3 e8 e3 45 8e ff <0f> ff eb c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768925] ---[ end trace 7c1f177091695317 ]---
Jan 21 02:12:23 javier-f22 kernel: [ 1297.768931] ipheth 1-1:4.2: ipheth_tx_timeout: TX timeout
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-25-generic 4.13.0-25.29
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: javier 2146 F...m pulseaudio
/dev/snd/controlC0: javier 2146 F.... pulseaudio
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sun Jan 21 02:13:18 2018
HibernationDevice: RESUME=UUID=37d3d57d-8be5-47ba-90a0-d1fcfa1bdc14
InstallationDate: Installed on 2017-09-21 (121 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: Dell Inc. XPS 15 9550
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro acpi_sleep=nonvs quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.13.0-25-generic N/A
linux-backports-modules-4.13.0-25-generic N/A
linux-firmware 1.169.1
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2017-11-07 (73 days ago)
dmi.bios.date: 12/11/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.6.1
dmi.board.name: 0N7TVV
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.6.1:bd12/11/2017:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: XPS 15 9550
dmi.sys.vendor: Dell Inc.
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