I discovered a way to cause this instantly, I attempted to change the
size of the ring buffers from 512 bytes to the hardware maximum of 4096
using: ethtool -G eno1 rx 4096 tx 4096, it instantly hung the interface
with the following in dmesg:
[458611.154752] e1000e 0000:00:19.0 eno1: Detected Hardware Unit Hang:
TDH <48>
TDT <73>
next_to_use <73>
next_to_clean <47>
buffer_info[next_to_clean]:
time_stamp <11b5117a3>
next_to_watch <48>
jiffies <11b511d40>
next_to_watch.status <0>
MAC Status <80083>
PHY Status <796d>
PHY 1000BASE-T Status <7c00>
PHY Extended Status <3000>
PCI Status <10>
[458613.138731] e1000e 0000:00:19.0 eno1: Detected Hardware Unit Hang:
TDH <48>
TDT <73>
next_to_use <73>
next_to_clean <47>
buffer_info[next_to_clean]:
time_stamp <11b5117a3>
next_to_watch <48>
jiffies <11b512500>
next_to_watch.status <0>
MAC Status <80083>
PHY Status <796d>
PHY 1000BASE-T Status <7c00>
PHY Extended Status <3000>
PCI Status <10>
[458615.122888] e1000e 0000:00:19.0 eno1: Detected Hardware Unit Hang:
TDH <48>
TDT <73>
next_to_use <73>
next_to_clean <47>
buffer_info[next_to_clean]:
time_stamp <11b5117a3>
next_to_watch <48>
jiffies <11b512cc0>
next_to_watch.status <0>
MAC Status <80083>
PHY Status <796d>
PHY 1000BASE-T Status <7c00>
PHY Extended Status <3000>
PCI Status <10>
[458617.106832] e1000e 0000:00:19.0 eno1: Detected Hardware Unit Hang:
TDH <48>
TDT <73>
next_to_use <73>
next_to_clean <47>
buffer_info[next_to_clean]:
time_stamp <11b5117a3>
next_to_watch <48>
jiffies <11b513480>
next_to_watch.status <0>
MAC Status <80083>
PHY Status <796d>
PHY 1000BASE-T Status <7c00>
PHY Extended Status <3000>
PCI Status <10>[458619.154912] e1000e 0000:00:19.0
eno1: Detected Hardware Unit Hang:
TDH <48>
TDT <73>
next_to_use <73>
next_to_clean <47>
buffer_info[next_to_clean]:
time_stamp <11b5117a3>
next_to_watch <48>
jiffies <11b513c80>
next_to_watch.status <0>
MAC Status <80083>
PHY Status <796d>
PHY 1000BASE-T Status <7c00>
PHY Extended Status <3000>
PCI Status <10>
[458620.562618] e1000e 0000:00:19.0 eno1: Reset adapter unexpectedly
[458620.562761] bridge0: port 1(eno1) entered disabled state
[458620.562789] bridge0: topology change detected, propagating
[458623.880650] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: Rx/Tx
[458623.880683] bridge0: port 1(eno1) entered blocking state
[458623.880688] bridge0: port 1(eno1) entered listening state
[458638.995031] bridge0: port 1(eno1) entered learning state
[458654.355381] bridge0: port 1(eno1) entered forwarding state
[458654.355385] bridge0: topology change detected, sending tcn bpdu
[476901.384610] bridge0: port 1(eno1) entered disabled state
[476901.384656] bridge0: topology change detected, propagating
[476905.544755] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow
Control: Rx/Tx
[476905.544788] bridge0: port 1(eno1) entered blocking state
[476905.544791] bridge0: port 1(eno1) entered listening state
[476920.887125] bridge0: port 1(eno1) entered learning state
[476936.247478] bridge0: port 1(eno1) entered forwarding state
[476936.247482] bridge0: topology change detected, sending tcn bpdu
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https://bugs.launchpad.net/bugs/1766377
Title:
Ethernet E1000 Controller Hangs
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