Program: 35263
Project: 35263
Buggy source:
private boolean removeNoCheck(long[] val2){
  if (root == null) {
    if (rootVal != null) {
      int posDiff=compare(val2,rootVal);
      if (posDiff == -1) {
        size--;
        rootVal=null;
        return true;
      }
    }
    return false;
  }
  Node n=root;
  int currentDepth=0;
  long[] currentPrefix=new long[val2.length];
  Node parent=null;
  boolean isParentHigh=false;
  while (true) {
    readInfix(n,currentDepth,currentPrefix);
    if (!doesInfixMatch(n,val2,currentDepth)) {
      return false;
    }
    currentDepth=n.posDiff;
    if (BitTools.getBit(val2,currentDepth)) {
      currentDepth++;
      if (n.hi != null) {
        isParentHigh=true;
        parent=n;
        n=n.hi;
        continue;
      }
 else {
        readPostFix(n.hiVal,currentPrefix);
        int posDiff=compare(val2,currentPrefix);
        if (posDiff != -1) {
          return false;
        }
        if (parent == null) {
          rootVal=n.loVal;
          root=n.lo;
        }
 else         if (isParentHigh) {
          parent.hiVal=n.loVal;
          parent.hi=n.lo;
        }
 else {
          parent.loVal=n.loVal;
          parent.lo=n.lo;
        }
        if (parent != null) {
          int start=((n.posDiff - 1) & 0x3F) + 1 - (n.infix != null ? n.infix.length : 0);
          start<<=6;
          parent.infix=extractInfix(val2,start,n.posDiff - 1);
        }
        size--;
        return true;
      }
    }
 else {
      currentDepth++;
      if (n.lo != null) {
        isParentHigh=false;
        parent=n;
        n=n.lo;
        continue;
      }
 else {
        readPostFix(n.loVal,currentPrefix);
        int posDiff=compare(val2,currentPrefix);
        if (posDiff != -1) {
          return false;
        }
        if (parent == null) {
          rootVal=n.hiVal;
          root=n.hi;
        }
 else         if (isParentHigh) {
          parent.hiVal=n.hiVal;
          parent.hi=n.hi;
        }
 else {
          parent.loVal=n.hiVal;
          parent.lo=n.hi;
        }
        if (parent != null) {
          int start=((n.posDiff - 1) & 0x3F) + 1 - (n.infix != null ? n.infix.length : 0);
          start<<=6;
          parent.infix=extractInfix(val2,start,n.posDiff - 1);
        }
        size--;
        return true;
      }
    }
  }
}

Fixed version (ground truth):
private boolean removeNoCheck(long[] val2){
  if (root == null) {
    if (rootVal != null) {
      int posDiff=compare(val2,rootVal);
      if (posDiff == -1) {
        size--;
        rootVal=null;
        return true;
      }
    }
    return false;
  }
  Node n=root;
  int currentDepth=0;
  long[] currentPrefix=new long[val2.length];
  Node parent=null;
  boolean isParentHigh=false;
  while (true) {
    readInfix(n,currentDepth,currentPrefix);
    if (!doesInfixMatch(n,val2,currentDepth)) {
      return false;
    }
    currentDepth=n.posDiff;
    if (BitTools.getBit(val2,currentDepth)) {
      currentDepth++;
      if (n.hi != null) {
        isParentHigh=true;
        parent=n;
        n=n.hi;
        continue;
      }
 else {
        readPostFix(n.hiVal,currentPrefix);
        int posDiff=compare(val2,currentPrefix);
        if (posDiff != -1) {
          return false;
        }
        long[] newPost=null;
        if (n.loVal != null) {
          readPostFix(n.loVal,currentPrefix);
          newPost=currentPrefix;
        }
        updateParentAfterRemove(parent,newPost,n.lo,isParentHigh,currentPrefix,n);
        return true;
      }
    }
 else {
      currentDepth++;
      if (n.lo != null) {
        isParentHigh=false;
        parent=n;
        n=n.lo;
        continue;
      }
 else {
        readPostFix(n.loVal,currentPrefix);
        int posDiff=compare(val2,currentPrefix);
        if (posDiff != -1) {
          return false;
        }
        long[] newPost=null;
        if (n.hiVal != null) {
          readPostFix(n.hiVal,currentPrefix);
          newPost=currentPrefix;
        }
        updateParentAfterRemove(parent,newPost,n.hi,isParentHigh,currentPrefix,n);
        return true;
      }
    }
  }
}