Problem with libMLP.so in root 4.00/08 at fedora core 2

ROOT
#1

When I try to use TMultiLayerPerceptron package, it gives me a “Segmentation fault” error at trainning. Even the example mlpHiggs.C in the tutorials gives me the same error at trainning stage.

I used gdb to check where it breaks down, below is the backtrace result:
#0 0x01200242 in _int_free () from /lib/tls/libc.so.6
#1 0x0120173b in free () from /lib/tls/libc.so.6
#2 0x01152dd3 in operator delete () from /usr/lib/libstdc++.so.5
#3 0x01152e2f in operator delete[] () from /usr/lib/libstdc++.so.5
#4 0x00282ce4 in TMultiLayerPerceptron::Train ()
from /znev09a/root/lib/root/libMLP.so
#5 0x0804a68f in main ()

I remember when I was using also root 4 at fedora core 1, there was no such kind of problem. Could anybody give me a hint what’s wrong?

Thanks a lot in advance,

Zhenhai

#2

Christophe Delaere will process your mail once he is back online.

Rene

#3

I was able to reproduce the problem on my FC2 machine, but I have no clue of the result. :cry:
The same code is actually running fine on other (older) distributions, so it may be related with gcc 3.3.3.

Running with gdb does not give me more usefull information and valgrind does not see anything wrong on a RH73 machine… :question:

I’ll investigate.

Best,
Christophe.