stack overflow when comparing deeply nested bson objects

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      Observed behavior: When mongod compares two deeply nested objects, a stack overflow is triggered. The following example triggers a stack overflow on osx 10.7.4 with both debug and release builds:

      t = db.t;
t.drop();

function makeNestObj(depth){
    toret = { a : 1};

    for(i = 1; i < depth; i++){
        toret = {a : toret};
    }

    return toret;
}

nestedObj = makeNestObj(1500);

// Save two deeply recursive 'a' values, so we can sort them.                               
t.insert( { a:nestedObj }, true );
t.insert( { a:nestedObj }, true );

t.find().sort( { a:1 } ).itcount(); // In memory sort triggers a stack overflow.

t.ensureIndex( { a:1 } ); // External sorter triggers a stack overflow.

            Assignee:
            Backlog - Query Team (Inactive)
            Reporter:
            Aaron Staple (Inactive)
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              Created:
              Updated:
              Resolved: