[Bug 214624] [patch] [netgraph] [panic] fix kernel panic due to loading default netgraph modules into INVARIANTS-enabled kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214624

            Bug ID: 214624
           Summary: [patch] [netgraph] [panic] fix kernel panic due to
                    loading default netgraph modules into
                    INVARIANTS-enabled kernel
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ports at grosbein.net
          Keywords: patch

Created attachment 177140
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177140&action=edit
make NG_ABI_VERSION depend on options INVARIANTS

It is possible currently to load netgraph.ko and other NETGRAPH-related kernel
modules built without INVARIANTS support into running kernel build with
INVARIANS option. However, actual usage of such combination produces kernel
panic:

panic: hashdestroy: hashtbl 0xc5ffc440 not empty (malloc type netgraph_node)
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper(c0a650f2,fffffff3,d,2dac00,63343430,...) at 0xc050580a =
db_trace_self_wrapper+0x2a/frame 0xef4c17e8
kdb_backtrace(c0ab3b11,0,c0a64f71,ef4c18b4,0,...) at 0xc07702ed =
kdb_backtrace+0x2d/frame 0xef4c1850
vpanic(c0a64f71,ef4c18b4,c0a64f71,ef4c18b4,ef4c18b4,...) at 0xc072e055 =
vpanic+0x115/frame 0xef4c1884
kassert_panic(c0a64f71,c0a64f9b,c5ffc440,c630c296,c630d99c,...) at 0xc072df39 =
kassert_panic+0xd9/frame 0xef4c18a8
hashdestroy(c5ffc440,c630d99c,f,1,f,...) at 0xc076f232 = hashdestroy+0x42/frame
0xef4c18d0
ng_make_node_common(c6414d5c,ef4c1940,531,c63f6080,c63d4358,...) at 0xc6304699
= ng_make_node_common+0x239/frame 0xef4c1900
ng_make_node(c63d4338,ef4c1940,0,0,0,...) at 0xc630437b =
ng_make_node+0x8b/frame 0xef4c1920
ng_mkpeer(c63d4378,c63d4338,0,0,0,...) at 0xc63085df = ng_mkpeer+0x1f/frame
0xef4c1950
ng_apply_item(1,0,1,ef4c19c8,1,...) at 0xc6306a24 = ng_apply_item+0x484/frame
0xef4c19a8
ng_snd_item(c63f6080,0,c5f49260,0,ef4c1b98,...) at 0xc630636f =
ng_snd_item+0x3ff/frame 0xef4c19d8
ngc_send(c62faa3c,0,c6337a00,c5f49350,0,...) at 0xc63e518a =
ngc_send+0x23a/frame 0xef4c1a64
sosend_generic(c62faa3c,c5f49350,ef4c1b18,0,0,...) at 0xc07bc25b =
sosend_generic+0x3eb/frame 0xef4c1ad8
kern_sendit(c6279350,5,ef4c1ba0,0,0,...) at 0xc07c2d7a =
kern_sendit+0x29a/frame 0xef4c1b4c
sendit(ef4c1ba0,0,28828fb8,0,c5f49350,...) at 0xc07c30bf = sendit+0x19f/frame
0xef4c1b88
sys_sendto(c6279350,ef4c1c50,c0a58bb0,4,c627a000,...) at 0xc07c2f18 =
sys_sendto+0x58/frame 0xef4c1bc0
syscall(ef4c1ce8) at 0xc09cc629 = syscall+0x399/frame 0xef4c1cdc
Xint0x80_syscall() at 0xc09b7efe = Xint0x80_syscall+0x2e/frame 0xef4c1cdc

Let's make NG_ABI_VERSION depend not on options NETGRAPH_DEBUG only, but on
options INVARIANTS too. Attached patch does this.

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