пятница, 29 июня 2018 г.

interesting case of memory leak

after three weeks of work service osqueryd.exe consumed about 150 mb of memory. so I made full memory dump with process explorer and run !heap -l in windbg
298991 string in log ! lets write quick and ditry perl script to calculate sizes of leaked blocks:
my $state = 0;
my($str, %dict, $size);
while( $str = <> )
{
  chomp $str;
  last if ( $str eq '' );
  if ( ! $state )
  {
    $state = 1 if ( $str =~ /^-----/ );
    next;
  }
  $str = substr($str, 72, 10);
  $str =~ s/^\s+//g;
  $str =~ s/\s+$//g;
  $size = hex($str);
  next if ( !$size );
  $dict{$size} += 1;
}

# dump results
my $iter;
foreach $iter ( sort { $dict{$b} <=> $dict{$a} } keys %dict )
{
  printf("%X %d\n", $iter, $dict{$iter});
}
results are encouraging: