cmcfarlen opened a new issue, #9261:
URL: https://github.com/apache/trafficserver/issues/9261
When ATS exits, it can crash if a debug statement is encountered *after* the
DbgCtl global registry Data is destructed. This happens in
`HostDBRecord::free` (at least). Perhaps we can ensure that the registry is
the last destructor called or otherwise avoid crashing on exit.
If I comment out `HostDBRecord::free` then it doesn't crash, but this is a
general problem for order of destruction.
```
#0 __strcmp_avx2 () at ../sysdeps/x86_64/multiarch/strcmp-avx2.S:853
#1 0x00007f3bde336f39 in DbgCtl::_RegistryAccessor::TagCmp::operator()
(this=0x7f3bde430108 <DbgCtl::_RegistryAccessor::data()::d+40>, a=..., b=...)
at /home/cmcfarlen/projects/oss/trafficserver/src/tscore/DbgCtl.cc:42
#2 0x00007f3bde336e3c in std::_Rb_tree<TSDbgCtl_s, TSDbgCtl_s,
std::_Identity<TSDbgCtl_s>, DbgCtl::_RegistryAccessor::TagCmp,
std::allocator<TSDbgCtl_s> >::_M_lower_bound (this=0x7f3bde430108
<DbgCtl::_RegistryAccessor::data()::d+40>,
__x=0x7f3bdcd430f0, __y=0x7f3bde430110
<DbgCtl::_RegistryAccessor::data()::d+48>, __k=...) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tree.h:1951
#3 0x00007f3bde336d4e in std::_Rb_tree<TSDbgCtl_s, TSDbgCtl_s,
std::_Identity<TSDbgCtl_s>, DbgCtl::_RegistryAccessor::TagCmp,
std::allocator<TSDbgCtl_s> >::find (this=0x7f3bde430108
<DbgCtl::_RegistryAccessor::data()::d+40>, __k=...)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_tree.h:2531
#4 0x00007f3bde33642d in std::set<TSDbgCtl_s,
DbgCtl::_RegistryAccessor::TagCmp, std::allocator<TSDbgCtl_s> >::find
(this=0x7f3bde430108 <DbgCtl::_RegistryAccessor::data()::d+40>, __x=...)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_set.h:795
#5 0x00007f3bde335f59 in DbgCtl::_get_ptr (tag=0x563f3fdba5f5 "hostdb") at
/home/cmcfarlen/projects/oss/trafficserver/src/tscore/DbgCtl.cc:89
#6 0x0000563f3f8d25e1 in DbgCtl::DbgCtl (this=0x563f40068dd8
<HostDBRecord::free()::Debug_ctl>, tag=0x563f3fdba5f5 "hostdb") at
/home/cmcfarlen/projects/oss/trafficserver/include/tscore/DbgCtl.h:36
#7 0x0000563f3fb98df8 in HostDBRecord::free (this=0x7f3bd9971f00) at
/home/cmcfarlen/projects/oss/trafficserver/iocore/hostdb/HostDB.cc:2086
#8 0x0000563f3f9c41c3 in Ptr<HostDBRecord>::~Ptr (this=0x7f3bd98c75a8) at
/home/cmcfarlen/projects/oss/trafficserver/include/tscore/Ptr.h:218
#9 0x0000563f3fbbf456 in HostFileRecord::~HostFileRecord
(this=0x7f3bd98c75a8) at
/home/cmcfarlen/projects/oss/trafficserver/iocore/hostdb/HostFile.h:33
#10 0x0000563f3fbbf429 in std::pair<ts::TextView const,
HostFileRecord>::~pair (this=0x7f3bd98c7598) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_iterator.h:2547
#11 0x0000563f3fbbf409 in
std::__new_allocator<std::__detail::_Hash_node<std::pair<ts::TextView const,
HostFileRecord>, true> >::destroy<std::pair<ts::TextView const, HostFileRecord>
> (this=0x7f3bd99490b8, __p=0x7f3bd98c7598)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/new_allocator.h:181
#12 0x0000563f3fbbf36d in
std::allocator_traits<std::allocator<std::__detail::_Hash_node<std::pair<ts::TextView
const, HostFileRecord>, true> > >::destroy<std::pair<ts::TextView const,
HostFileRecord> > (__a=..., __p=0x7f3bd98c7598)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/alloc_traits.h:535
#13 0x0000563f3fbbf33a in
std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<ts::TextView
const, HostFileRecord>, true> > >::_M_deallocate_node (this=0x7f3bd99490b8,
__n=0x7f3bd98c7590)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/hashtable_policy.h:1982
#14 0x0000563f3fbbf2f5 in
std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<ts::TextView
const, HostFileRecord>, true> > >::_M_deallocate_nodes (this=0x7f3bd99490b8,
__n=0x7f3bd98c7560)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/hashtable_policy.h:2004
#15 0x0000563f3fbbf215 in std::_Hashtable<ts::TextView,
std::pair<ts::TextView const, HostFileRecord>,
std::allocator<std::pair<ts::TextView const, HostFileRecord> >,
std::__detail::_Select1st, std::equal_to<ts::TextView>,
std::hash<std::basic_string_view<char, std::char_traits<char> > >,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true,
false, true> >::clear (
this=0x7f3bd99490b8) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/hashtable.h:2498
#16 0x0000563f3fbbf1a9 in std::_Hashtable<ts::TextView,
std::pair<ts::TextView const, HostFileRecord>,
std::allocator<std::pair<ts::TextView const, HostFileRecord> >,
std::__detail::_Select1st, std::equal_to<ts::TextView>,
std::hash<std::basic_string_view<char, std::char_traits<char> > >,
std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true,
false, true> >::~_Hashtable (
this=0x7f3bd99490b8) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/hashtable.h:1582
#17 0x0000563f3fbbeca5 in std::unordered_map<ts::TextView, HostFileRecord,
std::hash<std::basic_string_view<char, std::char_traits<char> > >,
std::equal_to<ts::TextView>, std::allocator<std::pair<ts::TextView const,
HostFileRecord> > >::~unordered_map (this=0x7f3bd99490b8) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/unordered_map.h:102
#18 0x0000563f3fbbec6a in HostFile::~HostFile (this=0x7f3bd99490b0) at
/home/cmcfarlen/projects/oss/trafficserver/iocore/hostdb/HostFile.h:38
#19 0x0000563f3fbbec35 in std::_Destroy<HostFile> (__pointer=0x7f3bd99490b0)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/stl_construct.h:151
#20 0x0000563f3fbbebd9 in std::allocator_traits<std::allocator<void>
>::destroy<HostFile> (__p=0x7f3bd99490b0) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/alloc_traits.h:648
#21 0x0000563f3fbbe7a6 in std::_Sp_counted_ptr_inplace<HostFile,
std::allocator<void>, (__gnu_cxx::_Lock_policy)2>::_M_dispose
(this=0x7f3bd99490a0)
at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/shared_ptr_base.h:613
#22 0x0000563f3f91411e in
std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
(this=0x7f3bd99490a0) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/shared_ptr_base.h:346
#23 0x0000563f3f91409a in
std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count
(this=0x563f40067c98 <hostDB+8>) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/shared_ptr_base.h:1071
#24 0x0000563f3fb9ebd9 in std::__shared_ptr<HostFile,
(__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=0x563f40067c90 <hostDB>) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/shared_ptr_base.h:1524
#25 0x0000563f3fb9b135 in std::shared_ptr<HostFile>::~shared_ptr
(this=0x563f40067c90 <hostDB>) at
/usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/shared_ptr.h:175
#26 0x0000563f3fb9b086 in HostDBCache::~HostDBCache (this=0x563f40067c90
<hostDB>) at
/home/cmcfarlen/projects/oss/trafficserver/iocore/hostdb/P_HostDBProcessor.h:164
#27 0x00007f3bdd045495 in __run_exit_handlers (status=0,
listp=0x7f3bdd219838 <__exit_funcs>,
run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at
./stdlib/exit.c:113
#28
```
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