[Bug 235342] [em] em0 hangs when vnet jail starts while transferring files

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235342

            Bug ID: 235342
           Summary: [em] em0 hangs when vnet jail starts while
                    transferring files
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: naito.yuichiro at gmail.com

I'm using "FreeBSD 13.0-CURRENT r343486 GENERIC-NODEBUG amd64" with following
NIC.

em0 at pci0:0:31:6:        class=0x020000 card=0x00008086 chip=0x15b78086 rev=0x31
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection (2) I219-LM'
    class      = network
    subclass   = ethernet

A following scenario causes em driver hangs.

1. start file transfer through em0.
   I used sftp or netatalk. Both of them causes same result.

2. start vnet jail while transferring the file.
   I used iocage with vnet=on dhcp=on bpf=yes.
   Without iocage using jail.conf causes same result.

3. "em0: TX(0) desc avail = 1024, pidx = 0" is shown on console repetitive and
infinitely.

After 3., em0 hangs and no packets can be sent and/or received.
ifconfig up/down won't recover this hang up.

I've tried my jail with iocage set vnet=on dhcp=off bpf=no,
Nothing changed.

Upgrading to 'FreeBSD 13.0-CURRENT r343598 GENERIC-NODEBUG amd64'
won't fix this problem.

Workaround is installing net/intel-em-kmod for now.

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