/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:52:06,239 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:52:06,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:52:06,268 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:52:06,268 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:52:06,269 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:52:06,271 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:52:06,273 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:52:06,274 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:52:06,275 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:52:06,276 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:52:06,277 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:52:06,277 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:52:06,278 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:52:06,280 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:52:06,281 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:52:06,282 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:52:06,283 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:52:06,284 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:52:06,286 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:52:06,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:52:06,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:52:06,290 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:52:06,291 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:52:06,294 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 15:52:06,294 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 15:52:06,294 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 15:52:06,295 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 15:52:06,296 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 15:52:06,297 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 15:52:06,302 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:52:06,302 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:52:06,303 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:52:06,304 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:52:06,330 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:52:06,330 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:52:06,331 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:52:06,331 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:52:06,331 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:52:06,332 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:52:06,332 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:52:06,332 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:52:06,332 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:52:06,333 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:52:06,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:52:06,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:52:06,333 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:52:06,333 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:52:06,334 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:52:06,334 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:52:06,334 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:52:06,334 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:52:06,334 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:52:06,335 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:52:06,335 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:52:06,335 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:52:06,335 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:52:06,335 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:52:06,336 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:52:06,336 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:52:06,336 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:52:06,336 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:52:06,337 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:52:06,337 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:52:06,633 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:52:06,646 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:52:06,649 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:52:06,651 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:52:06,651 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:52:06,652 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-08-21 15:52:06,727 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/393fd859f/c936f969628444f3aef3264625f479e4/FLAG719d411f5 [2020-08-21 15:52:07,300 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:52:07,301 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-08-21 15:52:07,310 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/393fd859f/c936f969628444f3aef3264625f479e4/FLAG719d411f5 [2020-08-21 15:52:07,635 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/393fd859f/c936f969628444f3aef3264625f479e4 [2020-08-21 15:52:07,645 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:52:07,647 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:52:07,650 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:52:07,650 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:52:07,653 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:52:07,655 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:52:07" (1/1) ... [2020-08-21 15:52:07,658 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d509997 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:07, skipping insertion in model container [2020-08-21 15:52:07,658 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:52:07" (1/1) ... [2020-08-21 15:52:07,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:52:07,725 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:52:08,072 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:52:08,083 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:52:08,153 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:52:08,170 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:52:08,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08 WrapperNode [2020-08-21 15:52:08,171 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:52:08,172 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:52:08,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:52:08,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:52:08,184 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,202 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,203 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,239 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... [2020-08-21 15:52:08,249 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:52:08,250 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:52:08,250 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:52:08,250 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:52:08,251 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:52:08,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:52:08,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:52:08,320 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:52:08,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:52:08,321 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-08-21 15:52:08,321 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-08-21 15:52:08,321 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:52:08,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:52:08,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:52:08,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:52:08,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 15:52:08,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 15:52:11,119 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:52:11,119 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 15:52:11,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:52:11 BoogieIcfgContainer [2020-08-21 15:52:11,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:52:11,135 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:52:11,135 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:52:11,139 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:52:11,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:52:07" (1/3) ... [2020-08-21 15:52:11,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b77ebab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:52:11, skipping insertion in model container [2020-08-21 15:52:11,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:52:08" (2/3) ... [2020-08-21 15:52:11,143 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b77ebab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:52:11, skipping insertion in model container [2020-08-21 15:52:11,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:52:11" (3/3) ... [2020-08-21 15:52:11,147 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+lh-reducer.c [2020-08-21 15:52:11,158 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:52:11,169 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:52:11,183 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:52:11,206 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:52:11,207 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:52:11,207 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:52:11,207 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:52:11,207 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:52:11,208 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:52:11,208 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:52:11,208 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:52:11,227 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 15:52:11,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 15:52:11,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:11,234 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:11,235 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:11,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:11,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1960518123, now seen corresponding path program 1 times [2020-08-21 15:52:11,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:11,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292736732] [2020-08-21 15:52:11,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:11,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:11,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:11,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:11,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:11,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292736732] [2020-08-21 15:52:11,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:52:11,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:52:11,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899980513] [2020-08-21 15:52:11,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:52:11,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:11,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:52:11,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:52:11,760 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 5 states. [2020-08-21 15:52:13,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:13,976 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 15:52:13,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:52:13,980 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 15:52:13,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:13,990 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:52:13,991 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 15:52:13,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:52:14,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 15:52:14,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 15:52:14,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 15:52:14,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 15:52:14,029 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 12 [2020-08-21 15:52:14,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:14,029 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 15:52:14,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:52:14,029 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 15:52:14,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 15:52:14,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:14,030 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:14,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:52:14,031 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:14,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:14,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1182240945, now seen corresponding path program 1 times [2020-08-21 15:52:14,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:14,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531698860] [2020-08-21 15:52:14,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:14,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:14,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:14,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:14,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:14,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531698860] [2020-08-21 15:52:14,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:14,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:52:14,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334466152] [2020-08-21 15:52:14,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:52:14,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:14,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:52:14,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:52:14,290 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2020-08-21 15:52:18,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:18,528 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 15:52:18,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:52:18,532 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-08-21 15:52:18,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:18,533 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:52:18,533 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 15:52:18,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:52:18,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 15:52:18,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-08-21 15:52:18,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 15:52:18,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 15:52:18,544 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 17 [2020-08-21 15:52:18,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:18,546 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 15:52:18,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:52:18,546 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 15:52:18,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:52:18,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:18,549 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:18,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:52:18,550 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:18,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:18,551 INFO L82 PathProgramCache]: Analyzing trace with hash 491744683, now seen corresponding path program 2 times [2020-08-21 15:52:18,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:18,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863757225] [2020-08-21 15:52:18,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:18,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:18,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:18,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:18,800 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:18,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863757225] [2020-08-21 15:52:18,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:18,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:52:18,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849452766] [2020-08-21 15:52:18,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:52:18,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:18,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:52:18,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:52:18,804 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2020-08-21 15:52:25,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:25,089 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 15:52:25,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:52:25,090 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 15:52:25,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:25,092 INFO L225 Difference]: With dead ends: 34 [2020-08-21 15:52:25,092 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:52:25,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:52:25,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:52:25,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 15:52:25,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:52:25,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 15:52:25,099 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 22 [2020-08-21 15:52:25,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:25,099 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 15:52:25,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:52:25,100 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 15:52:25,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 15:52:25,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:25,101 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:25,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:52:25,101 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:25,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:25,101 INFO L82 PathProgramCache]: Analyzing trace with hash 161258737, now seen corresponding path program 3 times [2020-08-21 15:52:25,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:25,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084419833] [2020-08-21 15:52:25,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:25,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:25,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:25,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:25,302 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:25,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084419833] [2020-08-21 15:52:25,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:25,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:52:25,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119243422] [2020-08-21 15:52:25,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:52:25,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:25,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:52:25,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:52:25,304 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 8 states. [2020-08-21 15:52:33,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:33,595 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 15:52:33,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:52:33,595 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 15:52:33,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:33,597 INFO L225 Difference]: With dead ends: 39 [2020-08-21 15:52:33,597 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:52:33,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:52:33,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:52:33,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-08-21 15:52:33,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 15:52:33,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 15:52:33,605 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 27 [2020-08-21 15:52:33,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:33,605 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 15:52:33,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:52:33,605 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 15:52:33,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:52:33,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:33,607 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:33,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:52:33,607 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:33,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:33,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1890060651, now seen corresponding path program 4 times [2020-08-21 15:52:33,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:33,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307195377] [2020-08-21 15:52:33,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:33,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:33,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:33,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:33,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307195377] [2020-08-21 15:52:33,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:33,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:52:33,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501813509] [2020-08-21 15:52:33,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:52:33,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:33,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:52:33,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:52:33,803 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 9 states. [2020-08-21 15:52:44,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:44,171 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 15:52:44,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:52:44,172 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2020-08-21 15:52:44,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:44,173 INFO L225 Difference]: With dead ends: 44 [2020-08-21 15:52:44,174 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 15:52:44,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:52:44,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 15:52:44,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 15:52:44,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:52:44,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 15:52:44,182 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 32 [2020-08-21 15:52:44,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:44,183 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 15:52:44,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:52:44,183 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 15:52:44,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 15:52:44,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:44,184 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:44,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:52:44,185 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:44,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:44,185 INFO L82 PathProgramCache]: Analyzing trace with hash -737191631, now seen corresponding path program 5 times [2020-08-21 15:52:44,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:44,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029002529] [2020-08-21 15:52:44,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:44,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:44,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:44,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:44,396 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:44,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029002529] [2020-08-21 15:52:44,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:44,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:52:44,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783253970] [2020-08-21 15:52:44,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:52:44,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:44,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:52:44,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:52:44,399 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 10 states. [2020-08-21 15:52:56,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:52:56,817 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 15:52:56,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:52:56,825 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-21 15:52:56,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:52:56,827 INFO L225 Difference]: With dead ends: 49 [2020-08-21 15:52:56,827 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:52:56,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:52:56,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:52:56,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2020-08-21 15:52:56,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:52:56,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 15:52:56,846 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 37 [2020-08-21 15:52:56,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:52:56,847 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 15:52:56,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:52:56,847 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 15:52:56,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 15:52:56,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:52:56,852 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:52:56,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:52:56,852 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:52:56,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:52:56,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1715407573, now seen corresponding path program 6 times [2020-08-21 15:52:56,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:52:56,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291871905] [2020-08-21 15:52:56,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:52:56,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:57,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:52:57,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:52:57,157 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:52:57,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291871905] [2020-08-21 15:52:57,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:52:57,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:52:57,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578858462] [2020-08-21 15:52:57,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:52:57,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:52:57,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:52:57,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:52:57,159 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 11 states. [2020-08-21 15:53:11,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:53:11,667 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 15:53:11,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:53:11,668 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2020-08-21 15:53:11,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:53:11,669 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:53:11,669 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 15:53:11,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:53:11,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 15:53:11,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 15:53:11,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 15:53:11,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 15:53:11,678 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 42 [2020-08-21 15:53:11,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:53:11,678 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 15:53:11,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:53:11,678 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 15:53:11,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 15:53:11,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:53:11,680 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:53:11,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:53:11,680 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:53:11,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:53:11,681 INFO L82 PathProgramCache]: Analyzing trace with hash -462174863, now seen corresponding path program 7 times [2020-08-21 15:53:11,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:53:11,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52257717] [2020-08-21 15:53:11,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:53:11,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:11,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:53:11,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:53:11,941 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:53:11,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52257717] [2020-08-21 15:53:11,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:53:11,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:53:11,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517011486] [2020-08-21 15:53:11,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:53:11,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:53:11,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:53:11,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:53:11,944 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 12 states.