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FreeBSD bug i386/176073: Update from 9.0-RELEASE-p3 to 9.1-RELEASE-p0 "breaks" network interface

I discovered this problem while performing a routine binary upgrade from 9.0-RELEASE-p3 to 9.1-RELEASE-p0. I checked UPDATING and there were no warnings about known issues relating to my NIC.

freebsd-update -r 9.1-RELEASE upgrade
freebsd-update install (reboot)
freebsd-update install

After the reboot my primary network interface em0 reported no carrier. To make a long story short, the interface previously known as em1 was now em0 and the interface previously known as em0 was no longer enumerated.

Scrolling back through the console messages showed:

em0: Setup of Shared code failed
device_attach: em0 attach returned 6
pciconf -vl showed that the interface previously enumerated as em0 was now none0

I have read about other similar issues by other people in the forums, but not necessarily with my NIC (Intel Pro/1000). I think the common denominator may be the chipset. As this is a leased server in a datacentre I don't have much to go on except that it is a SuperMicro PDSBM which appears to use the Intel 946GZ
(Lakeport-G). Perhaps something to do with a pci-related driver has changed.

Follow the bug report here.

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