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Confirmed that this is still an issue on 18.04.1. I have an HP 705 G1
with the Broadcom 5762. In my case it's a Plex server. Whenever I try to
stream something the interface goes "NO-CARRIER" and the only way to
recover is to reboot. I've tried disabling highdma, tso and gso using
ethtool, iommu=soft kernel parameter, and forcing every combo of
1gbps/100mbps & half/full duplex. Nothing seems to workaround the issue.

System:    Host: Bobs-HTPC Kernel: 4.15.0-43-generic x86_64 bits: 64 Console: 
tty 1 Distro: Ubuntu 18.04.1 LTS
Machine:   Device: desktop System: Hewlett-Packard product: HP EliteDesk 705 G1 
DM serial: N/A
           Mobo: Hewlett-Packard model: 225E serial: N/A BIOS: Hewlett-Packard 
v: L06 v02.31 date: 08/31/2018
Battery    hidpp__0: charge: N/A condition: NA/NA Wh
CPU:       Quad core AMD A8-7600 Radeon R7 10 Compute Cores 4C+6G (-MCP-) 
cache: 8192 KB
           clock speeds: max: 3100 MHz 1: 3094 MHz 2: 3094 MHz 3: 3094 MHz 4: 
3094 MHz
Graphics:  Card: Advanced Micro Devices [AMD/ATI] Kaveri [Radeon R7 Graphics]
           Display Server: N/A drivers: ati,radeon (unloaded: 
modesetting,fbdev,vesa)
           tty size: 120x53 Advanced Data: N/A out of X
Audio:     Card-1 Advanced Micro Devices [AMD] FCH Azalia Controller driver: 
snd_hda_intel
           Card-2 Advanced Micro Devices [AMD/ATI] Kaveri HDMI/DP Audio 
Controller driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.15.0-43-generic
Network:   Card-1: Intel Wireless 7260 driver: iwlwifi
           IF: wlp2s0 state: up mac: cc:3d:82:a7:bf:ed
           Card-2: Broadcom Limited NetXtreme BCM5762 Gigabit Ethernet PCIe 
driver: tg3
           IF: eno1 state: up speed: 100 Mbps duplex: half mac: 
ec:b1:d7:4c:2d:8e
Drives:    HDD Total Size: 9501.7GB (42.8% used)
           ID-1: /dev/sda model: ST500LM000 size: 500.1GB
           ID-2: USB /dev/sdb model: 5 size: 9001.6GB
Partition: ID-1: / size: 458G used: 23G (6%) fs: ext4 dev: /dev/sda1
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 40.8C mobo: N/A gpu: 42.0
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 227 Uptime: 12:49 Memory: 1608.0/5943.7MB Init: systemd 
runlevel: 5
           Client: Shell (bash) inxi: 2.3.56

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free online bettinghttps://bugs.launchpad.net/bugs/1447664

Title:
  14e4:1687 broadcom tg3 network driver disconnects under high load

Status in linux package in Ubuntu:
  Triaged
Status in linux package in Debian:
  New

Bug description:
  The tg3 broadcom network driver that binds with chipset 5762 goes offline and 
unable to recover (even with tg3 watchdog timeout) when network transmit is 
under high load.  Call trace:
  https://launchpadlibrarian.net/204185480/dmesg

  When this happens, only a reboot would be able to fix it.  Sometimes,
  however, bringing the interface offline and online (via ifconfig)
  would recover networking.  I've also tested with the latest tg3 driver
  (dec 2014 version) and networking is still problematic.  I have also
  disabled TSO, GSO etc... with ethtool and the bug still surfaces.
  This bug may be related to the integrated Firmware.

  Here is the procedure to replicate the issue because it is hard to
  replicate it under moderate network load.

  1. Bootup a machine with a broadcom 5762 NIC (ie. HP DeskElite 705) using a 
Ubuntu/Kubunu Live CD 14.04-15.04.
  2. from another machine: start 5 sessions, repetitively copy (scp with public 
key authentication) a 70 meg file back and forth to the tg3 machine in each 
session. (not sure if this is necessary)
  3. create a 1GB file on the tg3 machine, with something like dd 
if=/dev/urandom of=/my/test/file bs=1024 count=$((1024*1000))
  4. from another machine: repetitively scp copy that 1GB file from the tg3 
machine. This can be done with something like:

  while [ 0 ]; do
  ???scp -i /my/scp/private.key u...@ip.of.tg3:/my/test/file /tmp
  done;

  Networking will mostly goes offline in about 10-30 minutes.

  WORKAROUND: Add udev rule to make the changes permanent in 
/etc/udev/rules.d/80-tg3-fix.rules :
  ACTION=="add", SUBSYSTEM=="net", ATTRS{vendor}=="0x14e4", 
ATTRS{device}=="0x1687", RUN+="/sbin/ethtool -K %k highdma off"

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
  ?USER        PID ACCESS COMMAND
  ?/dev/snd/controlC1:  kubuntu    3748 F.... pulseaudio
  ?/dev/snd/controlC0:  kubuntu    3748 F.... pulseaudio
  CasperVersion: 1.360
  Date: Thu Apr 23 11:16:24 2015
  IwConfig:
  ?eth0      no wireless extensions.

  ?lo        no wireless extensions.
  LiveMediaBuild: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Hewlett-Packard HP EliteDesk 705 G1 MT
  ProcEnviron:
  ?LANGUAGE=
  ?TERM=xterm
  ?PATH=(custom, no user)
  ?LANG=en_US.UTF-8
  ?SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/hostname.seed boot=casper maybe-ubiquity quiet splash ---
  PulseList:
  ?Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
  ?No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
  ?linux-restricted-modules-3.19.0-15-generic N/A
  ?linux-backports-modules-3.19.0-15-generic  N/A
  ?linux-firmware                             1.143
  RfKill:

  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/22/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L06 v02.15
  dmi.board.asset.tag: 2UA5041TG4
  dmi.board.name: 2215
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: 2UA5041TG4
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrL06v02.15:bd10/22/2014:svnHewlett-Packard:pnHPEliteDesk705G1MT:pvr:rvnHewlett-Packard:rn2215:rvr:cvnHewlett-Packard:ct6:cvr:
  dmi.product.name: HP EliteDesk 705 G1 MT
  dmi.sys.vendor: Hewlett-Packard

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