This volume contains the proceedings of the 12th International SPIN Wo- shop on Model Checking of Software, held in San Francisco, USA, on August 22 24,2005.SPIN 2005is a forum for practitionersand researchersinterested in model-checking based techniques for the validation and analysis of communi- tion protocols and software systems. The workshop focuses on topics including theoretical and algorithmic foundations and tools for software model checking, modelderivationfromcodeandcodederivationfrommodels,techniquesforde- ing with large and in?nite state spaces, and applications. The workshop aims to foster interactions and exchanges of ideas with all related areas in software engineering. It has traditionally drawn contributions from both academia and industry. The SPIN workshop series started 10 years ago, in 1995. Since then, SPIN workshopshavebeenheldonanannualbasisatMontr eal(1995),NewBrunswick (1996), Enschede (1997), Paris (1998), Trento (1999), Toulouse (1999), St- ford (2000), Toronto (2001), Grenoble (2002), Portland (2003) and Barcelona (2004). All but the ?rst SPIN workshop were organized as satellite events of larger conferences, in particular of CAV (1996), TACAS (1997), FORTE/PSTV (1998),FLOC(1999),theWorldCongressonFormalMethods(1999),FMOODS (2000), ICSE (2001, 2003) and ETAPS (2002, 2004). This year, SPIN was held as a satellite event of CONCUR 2005. The co-location of SPIN workshops with conferenceshas provento be verysuccessfulandhas helpedto disseminateSPIN model checking technology to wider audiences. Since 1999, the proceedings of the SPIN workshops have appeared in Springer s Lecture Notes in Computer Science series. ThehistoryofsuccessfulSPINworkshopsisevidenceforthematuringofso- waremodel-checkingtechnology.Whileinearlieryearsthefocus oftheworkshop series was algorithms and tool development around the SPIN model-checker, its scope was widened several years ago to include other software model-checking techniques, tools and applications.

Inhalt
Invited Talks/Papers.- Pushdown Model Checking for Security.- Execution Generated Test Cases: How to Make Systems Code Crash Itself.- Invited Tutorials.- Effective Bug Hunting with Spin and Modex.- The BLAST Software Verification System.- Model Checking Programs with Java PathFinder.- State Representation and Abstraction.- An Incremental Heap Canonicalization Algorithm.- Memory Efficient State Space Storage in Explicit Software Model Checking.- Counterexample-Based Refinement for a Boundedness Test for CFSM Languages.- Dealing with Concurrency.- Symbolic Model Checking for Asynchronous Boolean Programs.- Improving Spin's Partial-Order Reduction for Breadth-First Search.- Sound Transaction-Based Reduction Without Cycle Detection.- Dealing with Complex Data.- Repairing Structurally Complex Data.- Crafting a Promela Front-End with Abstract Data Types to Mitigate the Sensitivity of (Compositional) Analysis to Implementation Choices.- Behavioural Models for Hierarchical Components.- Checking Temporal Properties.- On-the-Fly Emptiness Checks for Generalized Büchi Automata.- Stuttering Congruence for ?.- Verifying Pattern-Generated LTL Formulas: A Case Study.- Checking Security and Real-Time Properties.- Generic Verification of Security Protocols.- Using SPIN and Eclipse for Optimized High-Level Modeling and Analysis of Computer Network Attack Models.- Model Checking Machine Code with the GNU Debugger.- Tool Papers.- Etch: An Enhanced Type Checking Tool for Promela.- Enhanced Probabilistic Verification with 3Spin and 3Murphi.- SPLAT: A Tool for Model-Checking and Dynamically-Enforcing Abstractions.- Learning-Based Assume-Guarantee Verification (Tool Paper).