Hi,
Running GnuGk 4.8 on a Debian 8.10.
Compiled as "debugnoshared" along with its dependencies but the issue is
repeatable with GnuGk and its dependencies compiled as "optnoshared" too
and regardless of if GnuGk is run as root or a limited user.
Configured as a H.460.18/19 client gatekeeper so it refers to its parent
via DNS & SRV records. Crashes either on start or reload depending on
TraceLevel=.
The IPs and DNS names have been replaced in the output below.
With TraceLevel=3 crashes on config reload via status port.
The last line of the log is:
2018/03/21 20:18:57.626 2 RasSrv.cxx(947) GK Home =
1.2.3.4
The core dump says:
Program terminated with signal SIGABRT, Aborted.
#0 0x00007f978e85f067 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 0x00007f978e85f067 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f978e860523 in __GI_abort () at abort.c:118
#2 0x00007f978e89d1b4 in __libc_message (do_abort=do_abort@entry=1,
fmt=fmt@entry=0x7f978e992210 "*** Error in `%s': %s: 0x%s ***\n") at
../sysdeps/posix/libc_fatal.c:175
#3 0x00007f978e8a298e in malloc_printerr (action=1, str=0x7f978e98e326
"free(): invalid pointer", ptr=<optimized out>) at malloc.c:4996
#4 0x00007f978e8a3696 in _int_free (av=<optimized out>, p=<optimized
out>, have_lock=0) at malloc.c:3840
#5 0x0000000000930db8 in DnsRecordListFree (rec=0x1bd8c40) at
ptclib/pdns.cxx:315
#6 0x0000000000932609 in PDNS::Cached_DnsQuery (name=0x1b9c490
"_h323rs._udp.example.com", type=33, options=0, queryResults=0x7f978c32c200)
at ptclib/pdns.cxx:711
#7 0x000000000088305f in PDNS::Lookup<33u, PDNS::SRVRecordList,
PDNS::SRVRecord> (name=..., recordList=...)
at /home/asdf/gnugk/build/ptlib/include/ptclib/pdns.h:226
#8 0x0000000000882a59 in PDNS::GetRecords (service=...,
serviceList=...) at /home/asdf/gnugk/build/ptlib/include/ptclib/pdns.h:287
#9 0x0000000000931e9f in PDNS::LookupSRV (srvLookupStr=...,
defaultPort=1720, addrList=std::vector of length 0, capacity 0) at
ptclib/pdns.cxx:578
#10 0x0000000000931e3a in PDNS::LookupSRV (domain=..., service=...,
defaultPort=1720, addrList=std::vector of length 0, capacity 0) at
ptclib/pdns.cxx:567
#11 0x0000000000931926 in PDNS::LookupSRV (url=..., service=...,
returnList=...) at ptclib/pdns.cxx:529
#12 0x00000000004d9a91 in GkClient::OnReload (this=0x1bd68c0) at
GkClient.cxx:1669
#13 0x0000000000506dc1 in RasServer::LoadConfig (this=0x1bcce50) at
RasSrv.cxx:1044
#14 0x00000000005978c0 in ReloadHandler () at gk.cxx:1095
#15 0x0000000000462629 in StatusClient::ExecCommand
(this=0x7f976c004920, cmd=...) at GkStatus.cxx:1846
#16 0x0000000000469837 in SimpleClassJobA<StatusClient, PString>::Run
(this=0x7f9764006780) at job.h:236
#17 0x000000000040e5a3 in Worker::Main (this=0x7f976c006990) at job.cxx:182
#18 0x000000000099892a in PThread::PX_ThreadStart (arg=0x7f976c006990)
at ptlib/unix/tlibthrd.cxx:493
#19 0x00007f978fecd064 in start_thread (arg=0x7f978c32d700) at
pthread_create.c:309
#20 0x00007f978e91262d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
With TraceLevel=6 the gatekeeper crashes on start.
The lines of the log are:
2018/03/21 20:44:31.680 4 pdns.cxx(566) DNS SRV
Lookup "_h323rs._udp.example.com"
2018/03/21 20:44:31.680 5 pdns.cxx(727) DNS SRV
physical lookup "_h323rs._udp.example.com 33 0"
2018/03/21 20:44:31.689 6 pdns.cxx(741) DNS Query
success: 0x2b94120
2018/03/21 20:44:31.689 6 pdns.cxx(744) DNS Query:
name="", type=0, len=0
2018/03/21 20:44:31.689 6 pdns.cxx(744) DNS Query:
name="^Z<F8>@", type=157, len=0
2018/03/21 20:44:31.689 6 pdns.cxx(744) DNS Query:
name="H<89>}<F8>H<8B>E<F8>H<C7>", type=4332, len=35144
Looking at the pdns.cxx sources it seems that the contents of the pName
field are garbled for some reason.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00000000009328ff in PDNS::Cached_DnsQuery (name=0x2b57520
"_h323rs._udp.example.com", type=33, options=0, queryResults=0x7ffe3b0fcf60)
at ptclib/pdns.cxx:743
#1 0x000000000088305f in PDNS::Lookup<33u, PDNS::SRVRecordList,
PDNS::SRVRecord> (name=..., recordList=...)
at /home/asdf/gnugk/build/ptlib/include/ptclib/pdns.h:226
#2 0x0000000000882a59 in PDNS::GetRecords (service=...,
serviceList=...) at /home/asdf/gnugk/build/ptlib/include/ptclib/pdns.h:287
#3 0x0000000000931e9f in PDNS::LookupSRV (srvLookupStr=...,
defaultPort=1720, addrList=std::vector of length 0, capacity 0) at
ptclib/pdns.cxx:578
#4 0x0000000000931e3a in PDNS::LookupSRV (domain=..., service=...,
defaultPort=1720, addrList=std::vector of length 0, capacity 0) at
ptclib/pdns.cxx:567
#5 0x0000000000931926 in PDNS::LookupSRV (url=..., service=...,
returnList=...) at ptclib/pdns.cxx:529
#6 0x00000000004d9a91 in GkClient::OnReload (this=0x2b91890) at
GkClient.cxx:1669
#7 0x0000000000506dc1 in RasServer::LoadConfig (this=0x2b88740) at
RasSrv.cxx:1044
#8 0x00000000005088a9 in RasServer::Run (this=0x2b88740) at RasSrv.cxx:1439
#9 0x000000000059a50c in Gatekeeper::Main (this=0x2b61e90) at gk.cxx:1836
#10 0x00000000009be043 in PProcess::InternalMain (this=0x2b61e90) at
ptlib/common/osutils.cxx:1540
#11 0x0000000000596913 in main (argc=3, argv=0x7ffe3b0fdfe8,
envp=0x7ffe3b0fe008) at gk.cxx:53
Regards,
Esa
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