Re: seg fault on startup

[Andrew Haley <aph at redhat dot com>]

Ben Tatham writes:

 > I am building an application for Linux 2.4 with GCJ 4.1.2 for libc
 > 2.3.3 for powerpc-860.  Unfortunately, the application crashes on
 > startup everytime.  I have gone back to trying to build a simple
 > Hello World app, and the only version I can get to run is on that
 > is stripped and statically linked.  If I don't strip it or if I try
 > and use the shared libgcj, it seg faults.  Even if the libgcj is
 > also stripped.
 > 
 > Otherwise, no matter what I seem to do to either my Foo app or my
 > real application, I always get a Segmentation Fault.
 > 
 > The backtrace as seen from the core dump is:
 > (gdb) bt
 > #0  0x0f44019c in java::lang::NullPointerException::NullPointerException() ()
 >     from /usr/lib/libgcj.so.7
 > #1  0x0f1e6874 in catch_segv(int, sigcontext*) () from /usr/lib/libgcj.so.7
 > #2  0x7fc00748 in ?? ()
 > (gdb)
 > 
 > If I run the app from within gdb, I can the following backtrace:
 > 
 > #0  0x0f43f5e4 in java::lang::VMThrowable::__U3c_clinit__U3e_() ()
 >     from /usr/lib/libgcj.so.7
 > #1  0x0f21db88 in java::lang::Class::initializeClass() ()
 >     from /usr/lib/libgcj.so.7
 > #2  0x0f1e783c in _Jv_CreateJavaVM(_Jv_VMInitArgs*) ()
 >     from /usr/lib/libgcj.so.7
 > #3  0x0f1e7c68 in _Jv_RunMain(_Jv_VMInitArgs*, java::lang::Class*, char const*, int, char const**, 
 > bool) () from /usr/lib/libgcj.so.7
 > #4  0x0f1e7dbc in _Jv_RunMain(java::lang::Class*, char const*, int, char const**, bool) () from 
 > /usr/lib/libgcj.so.7
 > #5  0x0f1e7dec in JvRunMain () from /usr/lib/libgcj.so.7
 > 
 > 
 > We are upgrading from 4.0.1, and we had upgraded GCJ many times
 > before, with problems always being on the compile side of things
 > and were always resolved.  This time, its the runtime side...what
 > the difference this time, I have no idea.
 > 
 > Has anyone seen anything like this before?  Any help is appreciated...

This is weird.  Is your dynamic libgcj stripped too?  We really need
debuginfo here, or we'll never get started at all.

Andrew.