/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/recHanoi03-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 10:50:27,211 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 10:50:27,214 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 10:50:27,228 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 10:50:27,228 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 10:50:27,230 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 10:50:27,231 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 10:50:27,233 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 10:50:27,235 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 10:50:27,236 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 10:50:27,237 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 10:50:27,238 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 10:50:27,238 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 10:50:27,239 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 10:50:27,240 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 10:50:27,242 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 10:50:27,243 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 10:50:27,244 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 10:50:27,246 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 10:50:27,248 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 10:50:27,250 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 10:50:27,252 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 10:50:27,253 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 10:50:27,254 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 10:50:27,257 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 10:50:27,265 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 10:50:27,267 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 10:50:27,267 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 10:50:27,268 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 10:50:27,285 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 10:50:27,286 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 10:50:27,287 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 10:50:27,287 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 10:50:27,287 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 10:50:27,288 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 10:50:27,288 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 10:50:27,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 10:50:27,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 10:50:27,288 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 10:50:27,289 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 10:50:27,289 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 10:50:27,289 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 10:50:27,289 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 10:50:27,290 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 10:50:27,290 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 10:50:27,290 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 10:50:27,290 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 10:50:27,290 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 10:50:27,291 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 10:50:27,291 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 10:50:27,291 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 10:50:27,291 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 10:50:27,291 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 10:50:27,292 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 10:50:27,292 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 10:50:27,292 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:27,292 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 10:50:27,292 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 10:50:27,293 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 10:50:27,598 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 10:50:27,613 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 10:50:27,617 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 10:50:27,619 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 10:50:27,620 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 10:50:27,621 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-20 10:50:27,706 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/841b150e2/caaeedc61b2c4702b0dc368f21abf9bf/FLAG8c93c5a9b [2020-07-20 10:50:28,198 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 10:50:28,199 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-20 10:50:28,208 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/841b150e2/caaeedc61b2c4702b0dc368f21abf9bf/FLAG8c93c5a9b [2020-07-20 10:50:28,571 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/841b150e2/caaeedc61b2c4702b0dc368f21abf9bf [2020-07-20 10:50:28,581 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 10:50:28,584 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 10:50:28,586 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 10:50:28,586 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 10:50:28,589 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 10:50:28,591 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,594 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@125eb49d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28, skipping insertion in model container [2020-07-20 10:50:28,595 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,603 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 10:50:28,620 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 10:50:28,784 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:50:28,789 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 10:50:28,805 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 10:50:28,818 INFO L208 MainTranslator]: Completed translation [2020-07-20 10:50:28,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28 WrapperNode [2020-07-20 10:50:28,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 10:50:28,819 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 10:50:28,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 10:50:28,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 10:50:28,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,918 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,923 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,925 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,926 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... [2020-07-20 10:50:28,927 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 10:50:28,928 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 10:50:28,928 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 10:50:28,928 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 10:50:28,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 10:50:29,001 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 10:50:29,002 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 10:50:29,002 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2020-07-20 10:50:29,002 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 10:50:29,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 10:50:29,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 10:50:29,003 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2020-07-20 10:50:29,003 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 10:50:29,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 10:50:29,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 10:50:29,183 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 10:50:29,183 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 10:50:29,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:50:29 BoogieIcfgContainer [2020-07-20 10:50:29,188 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 10:50:29,189 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 10:50:29,190 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 10:50:29,192 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 10:50:29,193 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:50:28" (1/3) ... [2020-07-20 10:50:29,193 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@408c48f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:50:29, skipping insertion in model container [2020-07-20 10:50:29,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:50:28" (2/3) ... [2020-07-20 10:50:29,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@408c48f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:50:29, skipping insertion in model container [2020-07-20 10:50:29,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:50:29" (3/3) ... [2020-07-20 10:50:29,196 INFO L109 eAbstractionObserver]: Analyzing ICFG recHanoi03-2.c [2020-07-20 10:50:29,207 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 10:50:29,215 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 10:50:29,230 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 10:50:29,254 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 10:50:29,254 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 10:50:29,254 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 10:50:29,254 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 10:50:29,254 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 10:50:29,255 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 10:50:29,255 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 10:50:29,255 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 10:50:29,275 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 10:50:29,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 10:50:29,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:50:29,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:50:29,285 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:50:29,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:50:29,291 INFO L82 PathProgramCache]: Analyzing trace with hash 913793727, now seen corresponding path program 1 times [2020-07-20 10:50:29,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:50:29,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364333706] [2020-07-20 10:50:29,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:29,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:50:29,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 10:50:29,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:50:29,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 10:50:29,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 10:50:29,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364333706] [2020-07-20 10:50:29,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 10:50:29,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 10:50:29,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85080166] [2020-07-20 10:50:29,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 10:50:29,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:50:29,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 10:50:29,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 10:50:29,554 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-20 10:50:29,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:50:29,686 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-20 10:50:29,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 10:50:29,688 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-20 10:50:29,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:50:29,700 INFO L225 Difference]: With dead ends: 33 [2020-07-20 10:50:29,700 INFO L226 Difference]: Without dead ends: 19 [2020-07-20 10:50:29,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 10:50:29,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-20 10:50:29,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-20 10:50:29,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-20 10:50:29,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-07-20 10:50:29,755 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2020-07-20 10:50:29,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:50:29,756 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-07-20 10:50:29,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 10:50:29,757 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-07-20 10:50:29,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 10:50:29,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:50:29,759 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:50:29,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:29,976 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:50:29,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:50:29,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1998834103, now seen corresponding path program 1 times [2020-07-20 10:50:29,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:50:29,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525621647] [2020-07-20 10:50:29,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:50:30,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:50:30,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 10:50:30,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:50:30,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 10:50:30,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:50:30,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:50:30,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:50:54,676 WARN L193 SmtUtils]: Spent 9.33 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 10:51:11,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 10:51:13,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 10:51:13,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525621647] [2020-07-20 10:51:13,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 10:51:13,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2020-07-20 10:51:13,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592079758] [2020-07-20 10:51:13,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 10:51:13,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:13,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 10:51:13,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=162, Unknown=9, NotChecked=0, Total=210 [2020-07-20 10:51:13,149 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2020-07-20 10:51:15,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:15,632 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-20 10:51:15,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:51:15,639 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-07-20 10:51:15,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:15,641 INFO L225 Difference]: With dead ends: 31 [2020-07-20 10:51:15,641 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 10:51:15,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 44.9s TimeCoverageRelationStatistics Valid=76, Invalid=294, Unknown=10, NotChecked=0, Total=380 [2020-07-20 10:51:15,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 10:51:15,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-20 10:51:15,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 10:51:15,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-20 10:51:15,651 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-07-20 10:51:15,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:15,651 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-20 10:51:15,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 10:51:15,652 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-20 10:51:15,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 10:51:15,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:15,653 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:15,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:15,867 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:15,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:15,868 INFO L82 PathProgramCache]: Analyzing trace with hash -547108535, now seen corresponding path program 2 times [2020-07-20 10:51:15,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:15,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005345708] [2020-07-20 10:51:15,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:15,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:15,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 10:51:15,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:20,477 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 10:51:20,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:21,295 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:51:22,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005345708] [2020-07-20 10:51:22,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:51:22,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-20 10:51:22,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804305095] [2020-07-20 10:51:22,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 10:51:22,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:22,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 10:51:22,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=222, Unknown=2, NotChecked=0, Total=272 [2020-07-20 10:51:22,068 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2020-07-20 10:51:27,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:51:27,618 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-20 10:51:27,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 10:51:27,620 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-20 10:51:27,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:51:27,623 INFO L225 Difference]: With dead ends: 32 [2020-07-20 10:51:27,623 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 10:51:27,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=90, Invalid=460, Unknown=2, NotChecked=0, Total=552 [2020-07-20 10:51:27,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 10:51:27,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 10:51:27,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 10:51:27,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-20 10:51:27,631 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 32 [2020-07-20 10:51:27,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:51:27,632 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-20 10:51:27,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 10:51:27,632 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-20 10:51:27,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 10:51:27,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:51:27,634 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:51:27,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:27,850 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:51:27,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:51:27,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1152432193, now seen corresponding path program 3 times [2020-07-20 10:51:27,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:51:27,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737227943] [2020-07-20 10:51:27,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:51:27,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:51:27,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 10:51:27,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:51:38,679 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 10:51:38,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:51:40,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737227943] [2020-07-20 10:51:40,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:51:40,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 10:51:40,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628721642] [2020-07-20 10:51:40,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 10:51:40,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:51:40,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 10:51:40,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=282, Unknown=4, NotChecked=0, Total=342 [2020-07-20 10:51:40,962 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2020-07-20 10:52:41,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:52:41,415 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-07-20 10:52:41,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 10:52:41,419 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-07-20 10:52:41,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:52:41,420 INFO L225 Difference]: With dead ends: 35 [2020-07-20 10:52:41,421 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 10:52:41,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 45.4s TimeCoverageRelationStatistics Valid=110, Invalid=633, Unknown=13, NotChecked=0, Total=756 [2020-07-20 10:52:41,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 10:52:41,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 10:52:41,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 10:52:41,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-20 10:52:41,429 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 38 [2020-07-20 10:52:41,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:52:41,430 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-20 10:52:41,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 10:52:41,430 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-20 10:52:41,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 10:52:41,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:52:41,432 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:52:41,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:41,638 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:52:41,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:52:41,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1461718089, now seen corresponding path program 4 times [2020-07-20 10:52:41,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:52:41,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542901281] [2020-07-20 10:52:41,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:52:41,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:52:41,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 10:52:41,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:53:54,360 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 10:53:54,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:53:55,469 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:53:55,587 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:53:55,718 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:53:55,862 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:53:56,013 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:53:56,162 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:53:56,340 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:56,509 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:56,743 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:53:56,934 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:53:57,154 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 10:53:57,391 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 10:53:58,635 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:53:58,751 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:53:58,894 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:53:59,031 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:53:59,182 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:53:59,345 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:53:59,564 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:59,766 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:53:59,919 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:54:00,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542901281] [2020-07-20 10:54:00,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:54:00,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-20 10:54:00,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495112986] [2020-07-20 10:54:00,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 10:54:00,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:54:00,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 10:54:00,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=322, Unknown=34, NotChecked=0, Total=420 [2020-07-20 10:54:00,221 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2020-07-20 10:56:42,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 10:56:42,063 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 10:56:42,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 10:56:42,075 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2020-07-20 10:56:42,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 10:56:42,076 INFO L225 Difference]: With dead ends: 38 [2020-07-20 10:56:42,076 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 10:56:42,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 160.4s TimeCoverageRelationStatistics Valid=130, Invalid=803, Unknown=59, NotChecked=0, Total=992 [2020-07-20 10:56:42,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 10:56:42,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 10:56:42,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 10:56:42,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-20 10:56:42,084 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 44 [2020-07-20 10:56:42,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 10:56:42,085 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-20 10:56:42,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 10:56:42,085 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-20 10:56:42,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-20 10:56:42,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 10:56:42,087 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 10:56:42,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:42,291 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 10:56:42,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 10:56:42,292 INFO L82 PathProgramCache]: Analyzing trace with hash -269168065, now seen corresponding path program 5 times [2020-07-20 10:56:42,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 10:56:42,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176415368] [2020-07-20 10:56:42,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 10:56:42,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 10:56:42,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 10:56:42,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 10:58:51,540 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 10:58:51,592 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 10:58:51,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 10:58:52,478 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 10:58:52,589 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 10:58:52,718 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 10:58:52,855 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 10:58:53,023 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 10:58:53,177 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 10:58:53,358 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 10:58:53,541 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 10:58:53,744 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:58:53,960 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:58:54,203 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:58:54,441 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:58:54,704 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:58:54,987 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:58:55,288 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:58:55,638 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:58:55,998 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:58:56,346 WARN L193 SmtUtils]: Spent 341.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:58:56,726 WARN L193 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:58:57,105 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:58:57,547 WARN L193 SmtUtils]: Spent 436.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 10:58:57,989 WARN L193 SmtUtils]: Spent 437.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 10:58:58,436 WARN L193 SmtUtils]: Spent 439.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 10:58:58,876 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 10:58:59,799 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 10:59:00,066 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 10:59:00,191 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 10:59:00,336 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 10:59:00,494 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 10:59:00,717 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 10:59:00,921 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 10:59:01,141 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:59:01,375 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 10:59:01,680 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:59:01,977 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 10:59:02,275 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:59:02,540 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 10:59:02,872 WARN L193 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:59:03,168 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 10:59:03,496 WARN L193 SmtUtils]: Spent 322.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:59:03,822 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 10:59:04,171 WARN L193 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:59:04,495 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 10:59:04,742 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 10:59:04,991 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 10:59:05,229 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 10:59:05,486 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 10:59:05,692 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 10:59:05,857 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 10:59:06,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176415368] [2020-07-20 10:59:06,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 10:59:06,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-20 10:59:06,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030914215] [2020-07-20 10:59:06,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 10:59:06,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 10:59:06,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 10:59:06,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=381, Unknown=53, NotChecked=0, Total=506 [2020-07-20 10:59:06,254 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 18 states. [2020-07-20 11:03:06,361 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 11:04:00,361 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 11:04:41,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:04:41,115 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2020-07-20 11:04:41,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 11:04:41,130 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-07-20 11:04:41,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:04:41,132 INFO L225 Difference]: With dead ends: 41 [2020-07-20 11:04:41,132 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:04:41,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 299.7s TimeCoverageRelationStatistics Valid=150, Invalid=1010, Unknown=100, NotChecked=0, Total=1260 [2020-07-20 11:04:41,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:04:41,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 11:04:41,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 11:04:41,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-20 11:04:41,140 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 50 [2020-07-20 11:04:41,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:04:41,141 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-20 11:04:41,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 11:04:41,141 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-20 11:04:41,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 11:04:41,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:04:41,142 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:04:41,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:41,359 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:04:41,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:04:41,360 INFO L82 PathProgramCache]: Analyzing trace with hash 585432905, now seen corresponding path program 6 times [2020-07-20 11:04:41,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:04:41,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909793096] [2020-07-20 11:04:41,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:04:41,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:04:41,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:04:41,447 INFO L286 TraceCheckSpWp]: Computing forward predicates...