libgcj/93: GC causes core dump in gcj-compiled programs

[jsturm at sigma6 dot com]

>Number:         93
>Category:       libgcj
>Synopsis:       GC causes core dump in gcj-compiled programs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    tromey
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 05 14:16:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator:     Jeff Sturm
>Release:        current cvs
>Organization:
>Environment:
linux
>Description:
Programs compiled with current libgcj dump core sometime
after garbage collection.  The program:

public class HeapTest {
  public static void main(String[] args) {
    java.util.Random generator = new java.util.Random();
    Runtime runtime = Runtime.getRuntime();

    System.out.println("free memory  = " + runtime.freeMemory());
    System.out.println("total memory = " + runtime.totalMemory());

    for (int n = 0; n < 10000; n++) {
      byte[] junk = new byte[(generator.nextInt() & 0x7fffffff) % 512];
    }

    runtime.gc();

    System.out.println("free memory  = " + runtime.freeMemory());
    System.out.println("total memory = " + runtime.totalMemory());
  }
}

fails in the final println():

(gdb) run
Starting program: /home/jsturm/tmp/heaptest 
free memory  = 8192
total memory = 131072

Program received signal SIGSEGV, Segmentation fault.
0x400a74f0 in java::io::PrintStream::writeChars (this=@8061d80, str=@8064f18, 
    offset=0, count=21)
    at ../../../libgcj-current/libjava/java/io/PrintStream.java:123
123             if (out.count + count >= out.buf.length)
>How-To-Repeat:
Run the above program.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: