[Opalvoip-user] About the segfault/sigbus in PHashTableInfo::GetElementAt

[Giovani G. <gio...@gm...>]

Hi Guys,

I have a program that receives a SIP connection. Whenever it receives the
call, there is a segfault or a sigbus in PHashTableInfo::GetElementAt. OPAL
version is 3.14.0 and PTLIB version is 2.14.0.

Here is the part of the output log and the backtrace in gdb:

  0:04.997      0x7fffd8006b70       osutils.cxx(2611)  PTLib
Created read/write mutex 0x7fffcc01d0d8
  0:04.997      0x7fffd8006b70  mediasession.cxx(295)   Media
Session 1 for audio created.
  0:04.997      0x7fffd8006b70        config.cxx(179)   PTLib
Created PXConfig 0x7fffcc01a0e0
  0:04.998      0x7fffd8006b70       pconfig.cxx(74)    PTLib
PConfig::GetInteger str = 100


Program received signal SIGBUS, Bus error.
[Switching to Thread 0x7fffea773700 (LWP 5131)]
0x00007ffff7cd28b0 in PHashTableInfo::GetElementAt(PObject const&) () from
/usr/lib/libpt.so.2.14.0
Missing separate debuginfos, use: debuginfo-install
cyrus-sasl-lib-2.1.23-13.el6_3.1.x86_64 dbus-libs-1.2.24-7.el6_3.x86_64
expat-2.0.1-11.el6_2.x86_64 flac-1.2.1-6.1.el6.x86_64
glibc-2.12-1.132.el6.x86_64 gsm-1.0.13-4.el6.x86_64
libICE-1.0.6-1.el6.x86_64 libSM-1.2.1-2.el6.x86_64
libX11-1.5.0-4.el6.x86_64 libXau-1.0.6-4.el6.x86_64
libXext-1.3.1-2.el6.x86_64 libXi-1.6.1-3.el6.x86_64
libXtst-1.2.1-2.el6.x86_64 libasyncns-0.8-1.1.el6.x86_64
libgcc-4.4.7-4.el6.x86_64 libogg-1.1.4-2.1.el6.x86_64
libsndfile-1.0.20-5.el6.x86_64 libsrtp-1.4.4-4.20101004cvs.el6.x86_64
libstdc++-4.4.7-4.el6.x86_64 libtheora-1.1.0-2.el6.x86_64
libuuid-2.17.2-12.14.el6.x86_64 libvorbis-1.2.3-4.el6_2.1.x86_64
libxcb-1.8.1-1.el6.x86_64 ncurses-libs-5.7-3.20090208.el6.x86_64
nspr-4.10.2-1.el6_5.x86_64 nss-3.15.3-6.el6_5.x86_64
nss-softokn-freebl-3.14.3-9.el6.x86_64 nss-util-3.15.3-1.el6_5.x86_64
openldap-2.4.23-34.el6_5.1.x86_64 pulseaudio-libs-0.9.21-14.el6_3.x86_64
speex-1.2-0.12.rc1.1.el6.x86_64 tcp_wrappers-libs-7.6-57.el6.x86_64
zlib-1.2.3-29.el6.x86_64
(gdb) backtrace
#0  0x00007ffff7cd28b0 in PHashTableInfo::GetElementAt(PObject const&) ()
from /usr/lib/libpt.so.2.14.0
#1  0x00007ffff7c60464 in PConfig::GetString(PString const&, PString
const&, PString const&) const () from /usr/lib/libpt.so.2.14.0
#2  0x00007ffff7c5d6da in PConfig::GetInteger(PString const&, PString
const&, long) const () from /usr/lib/libpt.so.2.14.0
#3  0x00007ffff74e63ba in
OpalRTPSession::OpalRTPSession(OpalMediaSession::Init const&) () from
/usr/lib/libopal.so.3.14.0
#4  0x00007ffff74f1649 in PParamFactory<OpalMediaSession,
OpalMediaSession::Init const&,
PCaselessString>::Worker<OpalRTPSession>::Create(OpalMediaSession::Init
const&) const ()
   from /usr/lib/libopal.so.3.14.0
#5  0x00007ffff750242f in OpalRTPConnection::CreateMediaSession(unsigned
int, OpalMediaType const&, PString const&) () from
/usr/lib/libopal.so.3.14.0
#6  0x00007ffff750590a in OpalRTPConnection::UseMediaSession(unsigned int,
OpalMediaType const&, PString const&) () from /usr/lib/libopal.so.3.14.0
#7  0x00007ffff756ba8c in SIPConnection::SetUpMediaSession(unsigned int,
OpalMediaType const&, SDPMediaDescription const&, OpalTransportAddress&,
bool&) () from /usr/lib/libopal.so.3.14.0
#8  0x00007ffff756a47a in
SIPConnection::OnSendAnswerSDPSession(SDPMediaDescription*, unsigned int,
SDPCommonAttributes::Direction) () from /usr/lib/libopal.so.3.14.0
#9  0x00007ffff75651a8 in
SIPConnection::OnSendAnswerSDP(SDPSessionDescription const&,
SDPSessionDescription&) () from /usr/lib/libopal.so.3.14.0
#10 0x00007ffff7569317 in SIPConnection::SendInviteOK() () from
/usr/lib/libopal.so.3.14.0
#11 0x00007ffff756216d in SIPConnection::SetConnected() () from
/usr/lib/libopal.so.3.14.0
#12 0x00007ffff74a33cd in OpalCall::OnConnected(OpalConnection&) () from
/usr/lib/libopal.so.3.14.0
#13 0x00007ffff7477ac6 in OpalManager::OnConnected(OpalConnection&) () from
/usr/lib/libopal.so.3.14.0
#14 0x00007ffff7493176 in OpalConnection::OnConnectedInternal() () from
/usr/lib/libopal.so.3.14.0
#15 0x00007ffff7496579 in
OpalConnection::AnsweringCall(OpalConnection::AnswerCallResponse) () from
/usr/lib/libopal.so.3.14.0
#16 0x00007ffff756edaf in SIPConnection::OnReceivedINVITE(SIP_PDU&) () from
/usr/lib/libopal.so.3.14.0
#17 0x00007ffff755c4a7 in SIPConnection::OnReceivedPDU(SIP_PDU&) () from
/usr/lib/libopal.so.3.14.0
#18 0x00007ffff7548154 in SIP_PDU_Work::Work() () from
/usr/lib/libopal.so.3.14.0
#19 0x00007ffff75571ba in
PQueuedThreadPool<SIPWorkItem>::QueuedWorkerThread::Main() () from
/usr/lib/libopal.so.3.14.0
#20 0x00007ffff7c82032 in PThread::PX_ThreadMain(void*) () from
/usr/lib/libpt.so.2.14.0
#21 0x00000038c48079d1 in start_thread () from /lib64/libpthread.so.0
#22 0x00000038c44e8b6d in clone () from /lib64/libc.so.6


Inside the PConfig::GetInteger method, I added a PTRACE to print the
current value of the string, which is 100 ( PConfig::GetInteger str = 100).

GetInteger calls GetString which has an Iterator that accesses
PHashTableInfo::GetElementAt().

Is the cause of this error already known?

Best,
Giovani