[Tinyos-help] IBM JDK segfaults on libtoscomm.so

[Cory Sharp]

If it's really crashing in "didEventOccur", that function does very little
-- only accesses a couple of member variables and return a value.  I can't
imagine how the object pointer itself got corrupted. - Cory

On 6/1/07, David Gay <dgay42 at gmail.com> wrote:
>
> On 6/1/07, Philip Levis <pal at cs.stanford.edu> wrote:
> > On Jun 1, 2007, at 9:52 AM, Ákos Maróy wrote:
> >
> > > Ákos Maróy wrote:
> > >> 1XHEXCPMODULE  Module: /opt/ibm-jdk-bin-1.5.0.3/jre/bin/libtoscomm.so
> > >> 1XHEXCPMODULE  Module_base_address: 00002AAAAACD2000
> > >> 1XHEXCPMODULE  Symbol:
> > >> Java_net_tinyos_comm_TOSCommJNI_NativeSerial_1didEventOccur
> > >
> > > basically the code segfaults in the NativeSerial::didEventOccur()
> > > call.
> > >
> > > if I just put a std::cerr << "hello" << std::endl; call into the
> > > function - it doesn't segfault. this suggest that there's some memory
> > > corruption going on here.
> > >
> > > and still, it doesn't segfualt, but the mote sill stops sending data
> > > through the serial port (the TX light stops to blink), and won't react
> > > on the data received either. it sort of hangs.
> > >
> > >
> > > is there a way to use standard javacomm instead of this special
> > > library
> > > to do the serial communication?
> >
> > Can you get it to dump core and figure our where the bug occurs? That
> > is, the line of code/memory access?
> >
> > With a little bit of tweaking, it shouldn't be too difficult to get
> > the java code working with the standard Java comm. We moved away from
> > it due to some issues with supporting newer versions of Linux. There
> > was a time when it was really hard to find.
>
> The standard javacomm was also limited (especially on Linux) and
> buggy, and stayed that way for years. Don't know if it's improved...
>
> David Gay
>
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