Weird New libjava Testsuite Failure (PR java/14104)

[Andrew Haley <aph at redhat dot com>]

Andrew Haley writes:
 > Ranjit Mathew writes:
 >  > 
 >  > Any insights into the problem or at least how to
 >  > try to reproduce it reliably?
 > 
 > I'll have a look.

Okay, so it's even weirder than I thought.  If I rename libjava.jar to
libjava.0jar in order to make it run first in the testsuite, it
doesn't fail either!

We have a real Heisenbug here...

FWIW, there is a way to catch this: install a SEGV signal handler that
either sends the process SIGSTOP or goes into an infinite loop.  I'll
do it.

Andrew.

		=== libjava tests ===

Schedule of variations:
    unix

Running target unix
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for target.
Using /usr/share/dejagnu/config/unix.exp as generic interface file for target.
Using /local/aph/gcc/gcc/libjava/testsuite/config/default.exp as tool-and-target-specific interface file.
Running /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/jar.exp ...
Executing on host: /cuddles/aph/gcc/build/i686-pc-linux-gnu/libjava/testsuite/../libtool --silent --tag=GCJ --mode=link /local/aph/gcc/build/gcc/gcj -B/local/aph/gcc/build/gcc/ --encoding=UTF-8 -B/local/aph/gcc/build/i686-pc-linux-gnu//libjava/ /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/simple.jar   -no-install --main=simple -g  -L/local/aph/gcc/build/i686-pc-linux-gnu//libjava/.libs -lm   -o simple    (timeout = 300)
spawn /cuddles/aph/gcc/build/i686-pc-linux-gnu/libjava/testsuite/../libtool --silent --tag=GCJ --mode=link /local/aph/gcc/build/gcc/gcj -B/local/aph/gcc/build/gcc/ --encoding=UTF-8 -B/local/aph/gcc/build/i686-pc-linux-gnu//libjava/ /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/simple.jar -no-install --main=simple -g -L/local/aph/gcc/build/i686-pc-linux-gnu//libjava/.libs -lm -o simple 

PASS: linking simple
spawn [open ...]

hi
PASS: simple output
spawn [open ...]

hi
PASS: /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/simple.jar execution - gij test
PASS: /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/simple.jar output - gij test
testcase /local/aph/gcc/gcc/libjava/testsuite/libjava.0jar/jar.exp completed in 1 seconds
R