Latest libgcj broken?

Matt Welsh mdw@cs.berkeley.edu
Thu Mar 16 21:13:00 GMT 2000


I remember seeing something on the list that the latest libgcj might be
broken with respect to gcc 2.95.2. Is that still true?

I am trying to get to the point where I can use the new bells and whistles
in libgcj (e.g., dynamic class loading). I am happy to use any version of
egcs/gcc which is known to work with newer versions of libgcj. So far I 
haven't found a combination that works.

I have built gcc-2.95.2 from scratch using Bryce's latest patch, as well
as libgcj out of CVS (both the latest version and rolled back a month ago).

Bryce -- what version of gcc and libgcj are you using? 

In each case, for the simplest "Hello world" test program, I get the 
following crash at program startup time, and the following stack trace.

Note that using gij works just fine, so it seems to have to do with 
running a compiled binary.

This bug (with calling notifyAll() from _Jv_PrepareCompiledClass) looks
*really* familiar; didn't we have a fix for something like this a while
time ago?

Thanks much -

Matt Welsh

% gcj -o Hello --main=Hello Hello.class
% ./Hello
Aborted

$ gdb Hello
runGNU gdb 4.18
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This GDB was configured as "i386-redhat-linux"...
(gdb) run
Starting program: /disks/now/grad/mdw/src/ninja/test/mdw/Hello 
[New Thread 13292 (manager thread)]
[New Thread 13284 (initial thread)]
[New Thread 13293]
[Switching to Thread 13293]

Program received signal SIGABRT, Aborted.
0x40261111 in __kill () from /lib/libc.so.6
(gdb) where
#0  0x40261111 in __kill () from /lib/libc.so.6
#1  0x40227f7b in raise (sig=6) at signals.c:63
#2  0x40262447 in abort () at ../sysdeps/generic/abort.c:88
#3  0x804944b in __default_terminate ()
#4  0x804946c in __terminate ()
#5  0x8049ea4 in throw_helper (eh=0x807d650, pc=0x4020def1, 
    my_udata=0xbf7ffb1c, offset_p=0xbf7ffb18)
#6  0x804a05f in __throw ()
#7  0x400add09 in Letext ()
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/exception.cc:161
#8  0x40136f79 in java::lang::Object::notifyAll (this=0x804c988)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/gcj/cni.h:116
#9  0x40134e1d in _Jv_PrepareCompiledClass (klass=0x804c988)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/java/lang/natClassLoader.cc:273
#10 0x401334bb in java::lang::Class::initializeClass (this=0x804c988)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/java/lang/natClass.cc:694
#11 0x40153ad4 in _Jv_InitClass (klass=0x804c988)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/java/lang/Class.h:206
#12 0x804b11e in Hello::main ()
#13 0x40130277 in gnu::gcj::runtime::FirstThread::run (this=0x8063ea0)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/gnu/gcj/runtime/natFirstThread.cc:52
#14 0x4013c122 in java::lang::Thread::run_ (obj=0x8063ea0)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/java/lang/natThread.cc:293
#15 0x4014d2b8 in really_start (x=0x805eed0)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/libjava/posix-threads.cc:336
#16 0x4020def2 in GC_start_routine (arg=0x8082fe0)
    at /home/cs/mdw/disks/mm33/egcs-jaguar/src/libgcj-cvs/boehm-gc/linux_threads.c:553
#17 0x40225ce9 in pthread_start_thread (arg=0xbf7ffe7c) at manager.c:204




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