[Bug 225312] panic: Assertion if_getdrvflags(ifp) == i failed at /usr/src/sys/net/iflib.c:2201

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225312

            Bug ID: 225312
           Summary: panic: Assertion if_getdrvflags(ifp) == i failed at
                    /usr/src/sys/net/iflib.c:2201
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bhughes at freebsd.org

I am getting this panic on boot on an m4.xlarge EC2 instance running a
12.0-CURRENT snapshot:

panic: Assertion if_getdrvflags(ifp) == i failed at
/usr/src/sys/net/iflib.c:2201
cpuid = 3
time = 1516352386
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00882cc610
vpanic() at vpanic+0x18d/frame 0xfffffe00882cc670
vpanic() at vpanic/frame 0xfffffe00882cc6f0
iflib_init_locked() at iflib_init_locked+0x770/frame 0xfffffe00882cc750
iflib_if_ioctl() at iflib_if_ioctl+0x744/frame 0xfffffe00882cc7b0
ifioctl() at ifioctl+0x190f/frame 0xfffffe00882cc850
kern_ioctl() at kern_ioctl+0x2b9/frame 0xfffffe00882cc8b0
sys_ioctl() at sys_ioctl+0x15c/frame 0xfffffe00882cc980
amd64_syscall() at amd64_syscall+0x79b/frame 0xfffffe00882ccab0
fast_syscall_common() at fast_syscall_common+0xfc/frame 0x7fffffffe480

The snapshot is using this kernel:

FreeBSD 12.0-CURRENT #0 r328126: Thu Jan 18 15:25:44 UTC 2018
    root at releng3.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64

This seems to be related to the recent changes to make the ixl driver use
iflib.

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