[VPP-1335] vapi crash when memclnt_keepalive received

[vvalderrv]

Stack trace for thread 2:

Thread 2 "main" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffedbff700 (LWP 814141)]
0x00007ffff529c428 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
54 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff529c428 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007ffff529e02a in __GI_abort () at abort.c:89
#2  0x00007ffff5294bd7 in __assert_fail_base (fmt=<optimized out>,
assertion=assertion@entry=0x7ffff5bcb5f5 "id <= __vapi_metadata.count",
    file=file@entry=0x7ffff5bcb530
"/place/home/xpahos/git/vpp/build-data/../src/vpp-api/vapi/vapi.c",
line=line@entry=696, function=function@entry=0x7ffff5bcb6f0
<_PRETTY_FUNCTION_.39669> "vapi_msg_is_with_context") at assert.c:92
#3  0x00007ffff5294c82 in _GI__assert_fail
(assertion=assertion@entry=0x7ffff5bcb5f5
"id <= __vapi_metadata.count", file=file@entry=0x7ffff5bcb530
"/place/home/xpahos/git/vpp/build-data/../src/vpp-api/vapi/vapi.c",
    line=line@entry=696, function=function@entry=0x7ffff5bcb6f0
<_PRETTY_FUNCTION_.39669> "vapi_msg_is_with_context") at assert.c:101
#4  0x00007ffff5bcac0b in vapi_msg_is_with_context (id=id@entry=3200171710)
at /place/home/xpahos/git/vpp/build-data/../src/vpp-api/vapi/vapi.c:696
#5  0x00007ffff646f2a0 in vapi::Connection::dispatch (time=5, limit=0x0,
this=0x611000009500) at
/place/home/xpahos/git/vpp/build-root/install-vpp-native/vpp/include/vapi/vapi.hpp:270
#6  VOM::HW::cmd_q::rx_run (this=0x610000007d40) at
/place/home/xpahos/git/vpp/build-data/../extras/vom/vom/hw.cpp:45
#7  0x00007ffff58ffc80 in ?? () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#8  0x00007ffff50516ba in start_thread (arg=0x7fffedbff700) at
pthread_create.c:333
#9  0x00007ffff536e41d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Values:

Thread 2 "main" hit Breakpoint 1, vapi_msg_is_with_context (id=id@entry=130)
at /place/home/xpahos/git/vpp/build-data/../src/vpp-api/vapi/vapi.c:696
696   assert (id <= __vapi_metadata.count);
(gdb) print id
$1 = 130
(gdb) c
Continuing.
Mon Jul  2 13:52:37 2018 [debug]rpc_cmd.hpp:120 operator()() itf-events 0
Started

Thread 2 "main" hit Breakpoint 1, vapi_msg_is_with_context
(id=id@entry=3200171710)
at /place/home/xpahos/git/vpp/build-data/../src/vpp-api/vapi/vapi.c:696
696   assert (id <= __vapi_metadata.count);
(gdb) print id
$2 = 3200171710

Shared memory message:

(gdb) print shm_data_size
$3 = 10
(gdb) print shm_data
$4 = (void *) 0x30045a74
(gdb) x/10h 0x30045a74
0x30045a74: 5376 0 0 0 0 0 0 0
0x30045a84: 0 0