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CS527 Topics in Software Engineering (Software Testing and Analysis). Darko Marinov September 14, 2010. Schedule. First few lectures to help you select projects Testing: ReAssert, UDITA, Pex, Randoop Model checking: JPF Sep 14: CHESS (multithreaded testing)

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cs527 topics in software engineering software testing and analysis

CS527Topics in Software Engineering(Software Testing and Analysis)

Darko Marinov

September 14, 2010

schedule
Schedule
  • First few lectures to help you select projects
    • Testing: ReAssert, UDITA, Pex, Randoop
    • Model checking: JPF
    • Sep 14: CHESS (multithreaded testing)
    • Sep 16: Regression testing, note: survey paper
    • Sep 21: MC (static analysis)
    • Sep 23: REST (GUI testing)
    • Sep 28: Analysis of code comments?
    • Testing distributed or real-time systems?
    • From Oct 7: Your presentations
to dos
To-Dos
  • Email me (and Sandro) for project proposals
    • Project is the most important part of the course
    • Our discussion can help you select a project
    • Our discussion will help you select a paper
  • By Sep 23https://agora.cs.illinois.edu/display/cs527fa10/People+in+the+Course
    • Sign up for a slot to present a paper(even if you don’t know which paper yet)
    • List programming language(s) that you use
    • If you don’t sign up, you’ll get a random slot
    • If you sign up for early slots, you get bonus
paper today
Paper Today
  • Iterative Context Bounding for Systematic Testing of Multithreaded Programsby Madan Musuvathi and Shaz Qadeer(PLDI 2007)
  • CHESS web site
    • http://research.microsoft.com/en-us/projects/chess/default.aspx
    • A free version available for academic use only
  • Slides from a tutorial by Sebastian Burckhardt, Madan Musuvathi, and Shaz Qadeer
    • Not only about this specific paper
paper overview
Paper Overview
  • Problem
    • Testing multithreaded code is hard
    • Trying all thread interleavings doesn’t scale
  • Solution
    • Bound the number of preemptive context switches
    • Tool for Windows: CHESS (stateless, reexecutes)
    • Evaluation also for ZING (stateful)
  • Evaluation
    • 6 programs of various sizes
    • Found 14 previously unknown bugs
questions for discussion 1
Questions for Discussion (1)
  • Missing by 12:30: [CR], [AS]
  • Can POR improve CHESS & how much? [JC]
  • How often CHESS goes to infinite loop in state space graph? [MG]
  • Does this paper assume correct use of synchronization variables? [AA]
  • What is the difference between observable and non-observable race? [AA]
  • Better to limit rather than test threading? [HY]
  • How to automatically close open systems? [MK]
questions for discussion 2
Questions for Discussion (2)
  • How to know the size of state space? [AL]
  • Any advantages inserting (removing??) a scheduling point between two syncs? [DM]
  • Why not bound nonpreempting switches? [JN]
  • Can iterative context bounding be applied to message passing programs? [ST]
  • What’s used in industry, stress testing? [QL]
  • Soundness vs. completeness
    • False positives vs. false negatives
    • Precision vs. recall
  • Combine CHESS and Pex (or X and Y)?
questions for discussion 3
Questions for Discussion (3)
  • Why not report all accessed to shared data not protected by a synchronization variable?
  • How are data races identified?
  • How are other bugs identified? Assertions?
  • What other heuristics can one use? POR?
  • If you analyze models (ZING), how do you know there is bug in actual code?
  • How to test a complex multithreaded algorithm in mostly sequential code? Extract it out?
questions for discussion 4
Questions for Discussion (4)
  • How does it reduce time to polynomial?
  • What about dynamically changing number of threads in programs? Or dynamically created?
  • Can CHESS handle locks, mutexes, semaphores, etc.?
  • How to identify preemption or nonpreemption in Java code?
  • What are limits of this approach? Is it LOC, 10k, 100k, 1M? Is it # of threads, preemptions?
  • Can it be combined with DFS?
old questions for discussion 1
Old Questions for Discussion (1)
  • Which part of JPF/CHESS can be incorrect?
  • Can a compiler be model checked?
  • How difficult is it to set environments?
    • How to “close a system”?
  • Comparison of testing, model checking, and static analysis
  • When is model checking applicable?
  • What kind of bugs it can find?
  • Why work with language X not Y?
old questions for discussion 2
Old Questions for Discussion (2)
  • How well does it scale?
  • What about memory requirements?
  • What about time requirements?
  • How can I apply this on my code?
  • What’s recent work in this area?
    • A lot of work in many group, including mine
  • How to use the tool in practice?
  • How does CHESS/JPF compare states?
  • How good are heuristics?
sample project ideas
Sample Project Ideas
  • Apply CHESS on some software
    • Did you read the optional reading/report on JPF?
    • Compare with more tools and techniques
  • Consider other heuristics for exploration
    • Message-passing programs? Evolving code?
  • Automate creation of environments
  • Extend JPF implementation of CHESS
    • Contributed by Igor Andjelkovic, Steven Lauterburg, and Mirko Stojmenovic
  • Reimplement in another model checker
  • Improve debugging of multithreaded code