[Bug 243392] if_vmx(4): Input buffer corruption

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243392

--- Comment #11 from alexandr.oleynikov at gmail.com ---
For additional:

ifconfig down & up temporary fix problem but after receiveing again approx
300-500 Mbytes in short period network become unavailable again or kernel panic
(50%/50%)

# ifconfig vmx1 down && ifconfig vmx1 up && iperf3 -s -p 1234
-----------------------------------------------------------
Server listening on 1234
-----------------------------------------------------------
Accepted connection from 172.31.255.5, port 39861
[  5] local 172.31.255.2 port 1234 connected to 172.31.255.5 port 39030

--- kernel panic ---- 
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 02
fault virtual address   = 0x0
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff80cef252
stack pointer           = 0x28:0xfffffe00753547c0
frame pointer           = 0x28:0xfffffe00753548a0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (if_io_tqg_1)
trap number             = 12
panic: page fault
cpuid = 1
time = 1580287973
KDB: stack backtrace:
#0 0xffffffff80c1d297 at kdb_backtrace+0x67
#1 0xffffffff80bd05cd at vpanic+0x19d
#2 0xffffffff80bd0423 at panic+0x43
#3 0xffffffff810a7dcc at trap_fatal+0x39c
#4 0xffffffff810a7e19 at trap_pfault+0x49
#5 0xffffffff810a740f at trap+0x29f
#6 0xffffffff81081a0c at calltrap+0x8
#7 0xffffffff80ce9be5 at _task_fn_rx+0x75
#8 0xffffffff80c1bb54 at gtaskqueue_run_locked+0x144
#9 0xffffffff80c1b7b8 at gtaskqueue_thread_loop+0x98
#10 0xffffffff80b90c23 at fork_exit+0x83
#11 0xffffffff81082a4e at fork_trampoline+0xe
Uptime: 11m47s


And from sending side:
root at bsd_template:/usr/home/ao # iperf3 -c 172.31.255.2 -p 1234
Connecting to host 172.31.255.2, port 1234
[  5] local 172.31.255.5 port 39030 connected to 172.31.255.2 port 1234
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec   614 MBytes  5.07 Gbits/sec    1   8.74 KBytes
[  5]   1.01-2.03   sec  0.00 Bytes  0.00 bits/sec    3   8.74 KBytes
[  5]   2.03-3.02   sec  0.00 Bytes  0.00 bits/sec    1   8.74 KBytes
[  5]   3.02-4.03   sec  0.00 Bytes  0.00 bits/sec    1   8.74 KBytes
[  5]   4.03-5.03   sec  0.00 Bytes  0.00 bits/sec    0   8.74 KBytes
[  5]   5.03-6.02   sec  0.00 Bytes  0.00 bits/sec    1   8.74 KBytes
[  5]   6.02-7.03   sec  0.00 Bytes  0.00 bits/sec    0   8.74 KBytes
[  5]   7.03-8.03   sec  0.00 Bytes  0.00 bits/sec    0   8.74 KBytes
[  5]   8.03-9.03   sec  0.00 Bytes  0.00 bits/sec    0   8.74 KBytes

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