Public bug reported:
The following 25Gb Broadcom NIC error was seen on Xenial
running the 4.4.0-141-generic kernel on an amd64 host
seeing moderate-heavy network traffic (just once):
* The bnxt_en_po driver froze on a "TX timed out" error
and triggered the Netdev Watchdog timer under load.
* From kernel log:
"NETDEV WATCHDOG: eno2d1 (bnxt_en_bpo): transmit queue 0 timed out"
See attached kern.log excerpt file for full excerpt of error log.
* Release = Xenial
Kernel = 4.4.0-141-generic #167
eno2d1 = Product Name: Broadcom Adv. Dual 25Gb Ethernet
* This caused the driver to reset in order to recover:
"bnxt_en_bpo 0000:19:00.1 eno2d1: TX timeout detected, starting reset task!"
driver: bnxt_en_bpo
version: 1.8.1
source: ubuntu/bnxt/bnxt.c: bnxt_tx_timeout()
* The loss of connectivity and softirq stall caused other failures
on the system.
* The bnxt_en_po driver is the imported Broadcom driver
pulled in to support newer Broadcom HW (specific boards)
while the bnx_en module continues to support the older
HW. The current Linux upstream driver does not compile
easily with the 4.4 kernel (too many changes).
* This upstream and bnxt_en driver fix is a likely solution:
"bnxt_en: Fix TX timeout during netpoll"
commit: 73f21c653f930f438d53eed29b5e4c65c8a0f906
This fix has not been applied to the bnxt_en_po driver
version, but review of the code indicates that it is
susceptible to the bug, and the fix would be reasonable.
* No easy way to reproduce this
** Affects: linux (Ubuntu)
Importance: High
Status: New
** Tags: xenial
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https://bugs.launchpad.net/bugs/1814095
Title:
bnxt_en_po: TX timed out triggering Netdev Watchdog Timer
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