[Bug malloc/15160] New: memusagestat crashes with FPE with programs that don't use malloc

["siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15160

             Bug #: 15160
           Summary: memusagestat crashes with FPE with programs that don't
                    use malloc
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
        AssignedTo: siddhesh@redhat.com
        ReportedBy: siddhesh@redhat.com
    Classification: Unclassified


For programs that don't use malloc, memusage generates statistics with 0
maxheap_size, which results in a divide-by-zero FPE when it tries to generate
the graph image.

Steps to reproduce:

$ cat > foo.c
#include <stdio.h>

int main (int argc, char **argv)
{
  int i;

  for (i = 0; i < 10000; i++)
    puts (argv[0]);
  return 0;
}
^D

$ gcc foo.c

$ LD_PRELOAD=/glibc-build/malloc/libmemusage.so \
MEMUSAGE_OUTPUT=/tmp/memusage.TSY4YO ./a.out

/glibc-build/malloc/memusagestat /tmp/memusage.TSY4YO x.png

Actual Result:

Floating point exception

Expected Result:

Graph showing 0 utilization for dynamic memory allocation and actual stack
utilization.

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