bryancall commented on issue #7094:
URL: https://github.com/apache/trafficserver/issues/7094#issuecomment-670692273
More info:
```
(gdb) p (*_instList->_head)->_plugin
$48 = (RemapPluginInfo &) @0x2ac4ffffffff: {<PluginDso> =
{<PluginThreadContext> = {<RefCountObj> = {<ForceVFPTToTop> =
{_vptr.ForceVFPTToTop = 0x6b6}, m_refcount = 0},
static _tag = <error reading variable: No global symbol
"PluginThreadContext::_tag".>}, _next = 0x2ac95961aa4000, _prev = 0x0,
_configPath = {
static preferred_separator = 47 '/', _path = <error reading variable:
Cannot access memory at address 0xffffffffffffffe8>}, _effectivePath = {
static preferred_separator = 47 '/', _path = <error reading variable:
Cannot access memory at address 0xffffffffffffffe8>}, _runtimePath = {
static preferred_separator = 47 '/', _path = <error reading variable:
Cannot access memory at address 0xffffffffffffffe8>}, _dlh =
0xffffffffffffff00, _errorCode = {
_M_value = 127, _M_cat = 0x2ac50000000000}, static _tag = <error
reading variable: No global symbol "PluginDso::_tag".>, _mtime =
12043334749667328,
_preventiveCleaning = false, static _plugins = {m_ptr = 0x2ac41e2fd0d0},
_instanceCount = {<ForceVFPTToTop> = {_vptr.ForceVFPTToTop =
0xffffffffffffff00},
m_refcount = 127}}, dl_handle = 0x0, init_cb = 0x0,
pre_config_reload_cb = 0x0, post_config_reload_cb = 0xffffffffffffff00, done_cb
= 0x7f, new_instance_cb = 0x0,
delete_instance_cb = 0x0, do_remap_cb = 0x0, os_response_cb =
0xffffffffffffff00, static _tag = <error reading variable: No global symbol
"RemapPluginInfo::_tag".>,
_tempContext = 0x7f}
(gdb) p (*_instList->_tail)->_plugin
$49 = (RemapPluginInfo &) @0x2ac41e307480: {<PluginDso> =
{<PluginThreadContext> = {<RefCountObj> = {<ForceVFPTToTop> = {
_vptr.ForceVFPTToTop = 0x79c6e0 <vtable for RemapPluginInfo+16>},
m_refcount = 274246},
static _tag = <error reading variable: No global symbol
"PluginThreadContext::_tag".>}, _next = 0x2ac41e308740, _prev = 0x2ac41e3073c0,
_configPath = {
static preferred_separator = 47 '/', _path = "header_rewrite.so"},
_effectivePath = {static preferred_separator = 47 '/',
_path =
"/opt/oath/trafficserver/9.0/libexec/trafficserver/header_rewrite.so"},
_runtimePath = {static preferred_separator = 47 '/',
_path =
"/home/y/var/run/trafficserver/b49d6279-5263-475e-87a0-ada98bb4cbbe/opt/oath/trafficserver/9.0/libexec/trafficserver/header_rewrite.so"},
_dlh = 0x2ac41e2d6400, _errorCode = {_M_value = 0, _M_cat =
0x2ac3a6c5b8e8 <(anonymous namespace)::system_category_instance>},
static _tag = <error reading variable: No global symbol
"PluginDso::_tag".>, _mtime = 1595277283, _preventiveCleaning = true, static
_plugins = {
m_ptr = 0x2ac41e2fd0d0}, _instanceCount = {<ForceVFPTToTop> =
{_vptr.ForceVFPTToTop = 0x79cbf0 <vtable for RefCountObj+16>}, m_refcount =
137123}}, dl_handle = 0x0,
init_cb = 0x2ac3f842df20, pre_config_reload_cb = 0x0,
post_config_reload_cb = 0x0, done_cb = 0x0, new_instance_cb = 0x2ac3f842fc60,
delete_instance_cb = 0x2ac3f842dfc0,
do_remap_cb = 0x2ac3f842e270, os_response_cb = 0x0, static _tag = <error
reading variable: No global symbol "RemapPluginInfo::_tag".>, _tempContext =
0x0}
```
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