Re: [Quickfix-developers] Seg fault in libc.so while working with quickfix from Java

[Oren M. <ore...@ya...>]

You need to attach the java process itself to the
debugger.  If you want to debug, you should compile
the C++ and the Java code with the -g option.  Then
you can call "gdb java" and set your arguments to call
banzai.

You can only set breakpoints in quickfix_jni.so after
it is loaded by System.loadLibrary.

This is usually a pain, since it requires a rebuild of
QuickFIX with the debug options.  Inserting trace
statements where the problem is occuring
(SocketInitiator.cpp), may help you track the problem
down quicker.

--- David Monheit <Dav...@mo...>
wrote:
> Hi Gene,
> 
> I have applied both your patches and rebuilt all. 
> Unfortunately, I still get
> the core dump :-(  I also made sure that the host
> names (and tried ip addresses
> as well) were sensisble.
> 
> How does one debug a jni lib?  By attaching to the
> running java code with gdb?
> 
> Thanks and regards
> David
> 
> Gene Gorokhovsky wrote:
> 
> > This, as Sergey discovered the hard way, is what
> > happens on Linux when the initiator's
> > SocketConnectHost is invalid.  The reason is that
> > Quickfix Utility.cpp and SocketConnector.cpp
> ignore
> > bad return from gethostbyname. This is easily
> > reproducible on Linux by changing
> SocketConnectHost in
> > cfg/tradeclient.cfg and banzai.cfg to something
> > random. Both C++ and JNI client will fail with
> > segfaults when session connect will be attempted.
> >
> > The chain of events is as follows:
> > Invalid host name is specified in call to
> > socket_createConnector
> > socket_createConnector calls socket_hostname
> > socket_hostname  calls gethostbyname which returns
> > NULL
> > socket_hostname in turn returns NULL, which gets
> > passes as an argument to inet_addr
> > inet_addr calls inet_aton internally, which
> crashes
> > because its parameter is NULL instead of required
> > pointer.
> >
> > Here is the two patches that fix this problem.
> >
> > Stylistically there is some code overlap between
> > Utility.cpp and SocketConnector.cpp, which in the
> best
> > of worlds should be eliminated, but I prefer my
> > patches to be minimally invasive.
> >
> > Gene
> > --- Sergey Gribov <se...@se...> wrote:
> > > Hello,
> > >
> > > We have the following problem while working from
> > > Java:
> > > at a start time the Java application which uses
> the
> > > quickfix
> > > version 1.3.2 it fails with the following
> exception:
> > >
> > >
> > > An unexpected exception has been detected in
> native
> > > code outside the VM.
> > > Unexpected Signal : 11 occurred at PC=0x40149C73
> > > Function=inet_aton+0x3F
> > > Library=/lib/libc.so.6
> > >
> > > Current Java thread:
> > >         at
> > > org.quickfix.SocketInitiator.doStart(Native
> Method)
> > >         at
> > > org.quickfix.SocketInitiator.start(Unknown
> Source)
> > > .....
> > >
> > > Anybody saw something like this?
> > > Some other quickfix Java applications seems to
> be
> > > working fine...
> > >
> > > Any idea what can cause it?
> > >
> > > Thanks in advance,
> > >
> > > --
> > >
> >
>
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> > >   E-Mail: se...@se...           | learns
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> > > and more about less
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> > > and ends up knowing
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>
------------------------------------------------------------------------
> > --- Utility.cpp Tue Mar 18 17:23:17 2003
> > +++ /home/geneg/tmp/Utility.cpp Thu Feb 20
> 00:34:31 2003
> > @@ -112,13 +112,9 @@
> >  {
> >    int socket = ::socket( PF_INET, SOCK_STREAM,
> IPPROTO_TCP );
> > -  const char * num_dot_addr = socket_hostname(
> address );
> > -  if (num_dot_addr == 0)
> > -    return -1;
> >
> >    sockaddr_in addr;
> >    addr.sin_family = PF_INET;
> >    addr.sin_port = htons( port );
> > -  addr.sin_addr.s_addr = inet_addr(num_dot_addr);
> > -
> > +  addr.sin_addr.s_addr = inet_addr(
> socket_hostname( address ) );
> >
> >    int result = connect( socket, reinterpret_cast
> < sockaddr* > ( &addr ),
> >
> >  
>
------------------------------------------------------------------------
> > --- SocketConnector.cpp Tue Mar 18 21:11:01 2003
> > +++ /home/geneg/tmp/SocketConnector.cpp Tue Mar 18
> 21:08:13 2003
> > @@ -107,12 +107,8 @@
> >    int sock = socket( PF_INET, SOCK_STREAM,
> IPPROTO_TCP );
> >
> > -  const char * num_dot_addr = socket_hostname(
> address.c_str() );
> > -  if (num_dot_addr == 0)
> > -    return 0;
> > -
> >    sockaddr_in addr;
> >    addr.sin_family = PF_INET;
> >    addr.sin_port = htons( port );
> > -  addr.sin_addr.s_addr = inet_addr(num_dot_addr
> );
> > +  addr.sin_addr.s_addr = inet_addr(
> socket_hostname( address.c_str() ) );
> >
> >    int result = ::connect( sock, reinterpret_cast
> < sockaddr* > ( &addr ),
> 
> --
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> 
> 


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