Potential type mismatch in reassignment: identifier 'base' at stapxx-P7ZBdo6Z/luajit.stp:756:13

[jianhuang0]

openresty Version
root@timerserver-1:/home/game/flame-graph# dpkg -l | grep openresty
ii openresty 1.11.2.5-3xenial1 amd64 core server of OpenResty for production use
ii openresty-dbgsym 1.11.2.5-3xenial1 amd64 Debug symbols of OpenResty packages
ii openresty-openssl 1.1.0l-2xenial1 amd64 OpenSSL library for use by OpenResty ONLY
ii openresty-pcre 8.44-1xenial1 amd64 Perl-compatible regular expression library for use by OpenResty ONLY
ii openresty-zlib 1.2.11-3~xenial1 amd64 The zlib compression library for use by Openresty ONLY

systemtap Version
systemtap-4.4

• ./stapxx/samples/lj-lua-stacks.sxx --arg time=5 --skip-badvars -x 7271 -v
  Found exact match for libluajit: /usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0
  Pass 1: parsed user script and 483 library scripts using 106208virt/78800res/5468shr/73636data kb, in 320usr/80sys/730real ms.
  WARNING: Potential type mismatch in reassignment: identifier 'base' at stapxx-P7ZBdo6Z/luajit.stp:756:13
  source: base = @cast(L, "lua_State", "/usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0")->base
  ^
  WARNING: Potential type mismatch in reassignment: identifier 'base' at :731:9
  source: base = @cast(g, "global_State", "/usr/local/openresty/luajit/lib/libluajit-5.1.so.2.1.0")->jit_base->ptr32
  ^
  WARNING: Potential type mismatch in reassignment: identifier 'base' at :732:14
  source: if (!base) {
  ^
  WARNING: Potential type mismatch in reassignment: identifier 'base' at :736:48
  source: bt .= luajit_debug_dumpstack(L, T, 30, base, simple)
  ^
  Pass 2: analyzed script: 4 probes, 65 functions, 1 embed, 3 globals using 126448virt/100716res/6828shr/93876data kb, in 1420usr/60sys/1485real ms.
  Pass 3: translated to C into "/tmp/stapTZR3cy/stap_8e73193dcf65c6fb95823e31de80d924_20698_src.c" using 126448virt/101004res/7112shr/93876data kb, in 170usr/190sys/446real ms.
  Pass 4: compiled C into "stap_8e73193dcf65c6fb95823e31de80d924_20698.ko" in 4760usr/1200sys/5180real ms.
  Pass 5: starting run.
  WARNING: Start tracing 7271 (/usr/local/openresty/nginx/sbin/nginx)
  WARNING: Please wait for 5 seconds...
  WARNING: Time's up. Quitting now...
  WARNING: Found 0 JITted samples.