[Bug 243420] page fault in if_io_tqg_0 on virtualized guest

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243420

            Bug ID: 243420
           Summary: page fault in if_io_tqg_0 on virtualized guest
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mqudsi at neosmart.net

Greetings.

I have FreeBSD 12.1-RELEASE-p1 GENERIC (unmodified) amd64 running under ESXi
6.7, and have had no problems whatsoever for a number of years.

While using ctld to serve a zvol as an iscsi target, I ran into a kernel panic
(which I'll try to reproduce), summarized below:

------------------------------------------------------------------
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff80cef252
stack pointer           = 0x28:0xfffffe0075da18c0
frame pointer           = 0x28:0xfffffe0075da19a0
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_0)
trap number             = 12
panic: page fault
cpuid = 0
time = 1579311312
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
------------------------------------------------------------------

I recently upgraded the host machine and in the process switched from vmxnet3
virtualized network adapters to SR-IOV from the (same) Intel T520-CR. I had no
problems in the past with an exclusively vmxnet3 configuration, but before I
rush to blame it on if_ixv I must note that iSCSI is being served over the
usual and boring vmxnet3 interface.

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