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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Hello. I’m running a kea configuration where we leverage kea global reservations w/ Kea v 2.6.1.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Most of them look something like this:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> "hw-address": "74:86:e2:9d:cf:25",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> "ip-address": "10.221.53.34",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> "hostname": "test-switch-123",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> "option-data": []<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Whenever a DHCP request arrives from the client and there is a subnet mismatch:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">e.g.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">./dhcp4-packets.log.3:33153:2025-05-08 07:42:10.381 INFO [kea-dhcp4.packets/231784.140559790003968] DHCP4_PACKET_RECEIVED [hwtype=1 74:86:e2:9d:cf:25], cid=[no info], tid=0x510c7747: DHCPDISCOVER (type 1)
received from 10.254.82.1 to 10.80.252.85 on interface ens192<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Kea crashes with the following error:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">kea-dhcp4: /usr/include/boost/smart_ptr/shared_ptr.hpp:734: typename boost::detail::sp_member_access<T>::type boost::shared_ptr<T>::operator->() const [with T = const isc::dhcp::Host; typename boost::detail::sp_member_access<T>::type
= const isc::dhcp::Host*]: Assertion `px != 0' failed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Running it through GDB, we see this stack trace:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thread 12 "lt-kea-dhcp4" received signal SIGABRT, Aborted.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[Switching to Thread 0x7fffe9ff7700 (LWP 519001)]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">0x00007ffff21c55ef in raise () from /lib64/libc.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Missing separate debuginfos, use: yum debuginfo-install boost-system-1.66.0-13.el8.x86_64 cyrus-sasl-lib-2.1.27-6.el8_5.x86_64 glibc-2.28-251.0.2.el8_10.11.x86_64 isc-kea-common-2.6.1-isc20240725093407.el8.x86_64
isc-kea-hooks-2.6.1-isc20240725093407.el8.x86_64 keyutils-libs-1.5.10-9.0.1.el8.x86_64 krb5-libs-1.18.2-30.0.1.el8_10.x86_64 libcom_err-1.46.2-2.el8.x86_64 libgcc-8.5.0-22.0.1.el8_10.x86_64 libpq-13.11-1.el8.x86_64 libselinux-2.9-9.el8_10.x86_64 libstdc++-8.5.0-22.0.1.el8_10.x86_64
libxcrypt-4.1.1-6.el8.x86_64 log4cplus-1.2.0-11.el8.x86_64 mariadb-connector-c-3.1.11-2.el8_3.x86_64 openldap-2.4.46-20.el8_10.x86_64 openssl-libs-1.1.1k-14.el8_6.x86_64 pcre2-10.32-3.el8_6.x86_64 zlib-1.2.11-25.el8.x86_64<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">(gdb) backtrace<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#0 0x00007ffff21c55ef in raise () from /lib64/libc.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#1 0x00007ffff2198e65 in abort () from /lib64/libc.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#2 0x00007ffff2198d39 in __assert_fail_base.cold.0 () from /lib64/libc.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#3 0x00007ffff21bdf46 in __assert_fail () from /lib64/libc.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#4 0x0000000000570c53 in boost::shared_ptr<isc::dhcp::Host const>::operator-> (this=0x7fffe9ff4630) at /usr/include/boost/smart_ptr/shared_ptr.hpp:734<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#5 0x00007ffff779c6d9 in (anonymous namespace)::hasAddressReservation (ctx=...) at alloc_engine.cc:3462<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#6 0x00007ffff779ea5d in isc::dhcp::AllocEngine::discoverLease4 (this=0x918a50, ctx=...) at alloc_engine.cc:3856<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#7 0x00007ffff779dc19 in isc::dhcp::AllocEngine::allocateLease4 (this=0x918a50, ctx=...) at alloc_engine.cc:3702<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#8 0x0000000000558a08 in isc::dhcp::Dhcpv4Srv::assignLease (this=0x7fffffffd250, ex=...) at dhcp4_srv.cc:3060<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#9 0x000000000055c8e6 in isc::dhcp::Dhcpv4Srv::processDiscover (this=0x7fffffffd250, discover=..., context=...) at dhcp4_srv.cc:3709<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#10 0x000000000054d809 in isc::dhcp::Dhcpv4Srv::processLocalizedQuery4 (this=0x7fffffffd250, ctx=..., allow_answer_park=true) at dhcp4_srv.cc:1586<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#11 0x000000000054c655 in isc::dhcp::Dhcpv4Srv::processDhcp4Query (this=0x7fffffffd250, query=..., allow_answer_park=true) at dhcp4_srv.cc:1532<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#12 0x000000000054b49b in isc::dhcp::Dhcpv4Srv::processPacket (this=0x7fffffffd250, query=..., allow_answer_park=true) at dhcp4_srv.cc:1455<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#13 0x000000000054a215 in isc::dhcp::Dhcpv4Srv::processPacketAndSendResponse (this=0x7fffffffd250, query=...) at dhcp4_srv.cc:1256<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#14 0x0000000000549f98 in isc::dhcp::Dhcpv4Srv::processPacketAndSendResponseNoThrow (this=0x7fffffffd250, query=...) at dhcp4_srv.cc:1244<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#15 0x0000000000598e09 in std::__invoke_impl<void, void (isc::dhcp::Dhcpv4Srv::*&)(boost::shared_ptr<isc::dhcp::Pkt4>), isc::dhcp::Dhcpv4Srv*&, boost::shared_ptr<isc::dhcp::Pkt4>&> (__f=<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> @0x93aa30: (void (isc::dhcp::Dhcpv4Srv::*)(isc::dhcp::Dhcpv4Srv * const, boost::shared_ptr<isc::dhcp::Pkt4>)) 0x549f4a <isc::dhcp::Dhcpv4Srv::processPacketAndSendResponseNoThrow(boost::shared_ptr<isc::dhcp::Pkt4>)>,
__t=@0x93aa50: 0x7fffffffd250) at /usr/include/c++/8/bits/invoke.h:73<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#16 0x0000000000595cb7 in std::__invoke<void (isc::dhcp::Dhcpv4Srv::*&)(boost::shared_ptr<isc::dhcp::Pkt4>), isc::dhcp::Dhcpv4Srv*&, boost::shared_ptr<isc::dhcp::Pkt4>&> (__fn=<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> @0x93aa30: (void (isc::dhcp::Dhcpv4Srv::*)(isc::dhcp::Dhcpv4Srv * const, boost::shared_ptr<isc::dhcp::Pkt4>)) 0x549f4a <isc::dhcp::Dhcpv4Srv::processPacketAndSendResponseNoThrow(boost::shared_ptr<isc::dhcp::Pkt4>)>)
at /usr/include/c++/8/bits/invoke.h:95<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#17 0x0000000000592359 in std::_Bind<void (isc::dhcp::Dhcpv4Srv::*(isc::dhcp::Dhcpv4Srv*, boost::shared_ptr<isc::dhcp::Pkt4>))(boost::shared_ptr<isc::dhcp::Pkt4>)>::__call<void, , 0ul, 1ul>(std::tuple<>&&,
std::_Index_tuple<0ul, 1ul>) (this=0x93aa30, __args=...) at /usr/include/c++/8/functional:400<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#18 0x000000000058c8c2 in std::_Bind<void (isc::dhcp::Dhcpv4Srv::*(isc::dhcp::Dhcpv4Srv*, boost::shared_ptr<isc::dhcp::Pkt4>))(boost::shared_ptr<isc::dhcp::Pkt4>)>::operator()<, void>() (<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> this=0x93aa30) at /usr/include/c++/8/functional:484<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#19 0x0000000000584d2f in std::_Function_handler<void (), std::_Bind<void (isc::dhcp::Dhcpv4Srv::*(isc::dhcp::Dhcpv4Srv*, boost::shared_ptr<isc::dhcp::Pkt4>))(boost::shared_ptr<isc::dhcp::Pkt4>)> >::_M_invoke(std::_Any_data
const&) (__functor=...) at /usr/include/c++/8/bits/std_function.h:297<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#20 0x00007ffff79143a6 in std::function<void ()>::operator()() const (this=0x1426af0) at /usr/include/c++/8/bits/std_function.h:687<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#21 0x00007ffff4187348 in isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >::run() (this=0x7ffff43ffa58
<isc::util::MultiThreadingMgr::instance()::manager+24>) at ../../../src/lib/util/thread_pool.h:599<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#22 0x00007ffff4189058 in std::__invoke_impl<void, void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::*)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*>(std::__invoke_memfun_deref, void (isc::util::ThreadPool<std::function<void
()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >::*&&)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >*&&) (<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> __f=@0x1531210: (void (isc::util::ThreadPool<std::function<void()>, std::deque<boost::shared_ptr<std::function<void()> >, std::allocator<boost::shared_ptr<std::function<void()> > > > >::*)(isc::util::ThreadPool<std::function<void()>,
std::deque<boost::shared_ptr<std::function<void()> >, std::allocator<boost::shared_ptr<std::function<void()> > > > > * const)) 0x7ffff41872e6 <isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::run()>,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> __t=@0x1531208: 0x7ffff43ffa58 <isc::util::MultiThreadingMgr::instance()::manager+24>) at /usr/include/c++/8/bits/invoke.h:73<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#23 0x00007ffff418827d in std::__invoke<void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> >
> > >::*)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*>(void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void
()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >::*&&)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*&&) (<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> __fn=@0x1531210: (void (isc::util::ThreadPool<std::function<void()>, std::deque<boost::shared_ptr<std::function<void()> >, std::allocator<boost::shared_ptr<std::function<void()> > > > >::*)(isc::util::ThreadPool<std::function<void()>,
std::deque<boost::shared_ptr<std::function<void()> >, std::allocator<boost::shared_ptr<std::function<void()> > > > > * const)) 0x7ffff41872e6 <isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::run()>)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> at /usr/include/c++/8/bits/invoke.h:95<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#24 0x00007ffff418accb in std::thread::_Invoker<std::tuple<void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::*)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*> >::_M_invoke<0ul, 1ul>(std::_Index_tuple<0ul, 1ul>) (this=0x1531208) at
/usr/include/c++/8/thread:244<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#25 0x00007ffff418ac4a in std::thread::_Invoker<std::tuple<void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::*)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*> >::operator()() (this=0x1531208) at /usr/include/c++/8/thread:253<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#26 0x00007ffff418ab6a in std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void
()> > > > >::*)(), isc::util::ThreadPool<std::function<void ()>, std::deque<boost::shared_ptr<std::function<void ()> >, std::allocator<boost::shared_ptr<std::function<void ()> > > > >*> > >::_M_run() (this=0x1531200) at /usr/include/c++/8/thread:196<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#27 0x00007ffff2baab23 in execute_native_thread_routine () from /lib64/libstdc++.so.6<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#28 0x00007ffff3c941da in start_thread () from /lib64/libpthread.so.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">#29 0x00007ffff21b08d3 in clone () from /lib64/libc.so.6, this is the full stack trace:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">So it appears that Kea is not handling the subnet/IP mismatch.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For reference, I also see this error being referenced in this thread from 2018
<a href="https://lists.isc.org/pipermail/kea-users/2018-October/002062.html">https://lists.isc.org/pipermail/kea-users/2018-October/002062.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Can someone investigate this potential bug, or, if there is a preferred configuration change we can make to stabilize this, we can share more about our configs.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-Nate<o:p></o:p></span></p>
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