[Bug 233940] em0 Doesn't work during install

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233940

            Bug ID: 233940
           Summary: em0 Doesn't work during install
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dgilbert at eicat.ca

So... if I choose live CD and type "ifconfig em0 up" followed by "dhclient em0"
... everything works... but if I go through the install, select something that
isn't on the media and continue, selecting em0 as my network, and ipv4->DHCP
... I see "sendmeg on em0: No buffer space available" ...

If I don't choose anything off-media, but still choose ipv4->DHCP->em0 later,
It fails inconsequentially, and on reboot it still says "sendmsg on em0: No
buffer space available" ... but then it succeeds later after loading uhid.ko
(just giving that for ordering... uhid.ko isn't loaded for the livecd, I don't
believe).

The machine is and HP Compaq 8100 Elite with an i5 660 and 4G RAM.
The em0 is on the motherboard and probes as:

em0: <Intel(R) PRO/1000 Network Connection> port 0x3100-0x311f mem
0xf0400000-0xf041ffff,0xf0425000-0xf0425fff irq 19 at device 25.0 on pci0
em0: attach_pre capping queues at 1
em0: using 1024 tx descriptors and 1024 rx descriptors
em0: msix_init qsets capped at 1
em0: Unable to map MSIX table
em0: Using an MSI interrupt
em0: allocated for 1 tx_queues
em0: allocated for 1 rx_queues
em0: Ethernet address: 40:61:86:xx:xx:xx
em0: netmap queues/slots: TX 1/1024, RX 1/1024
em0: link state changed to UP

This link was also confirmed by cksalexander at q.com on the mailing list before I
submitted this.

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