/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 13:19:29,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 13:19:29,820 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 13:19:29,856 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 13:19:29,857 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 13:19:29,864 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 13:19:29,867 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 13:19:29,871 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 13:19:29,873 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 13:19:29,877 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 13:19:29,878 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 13:19:29,879 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 13:19:29,879 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 13:19:29,881 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 13:19:29,883 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 13:19:29,885 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 13:19:29,887 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 13:19:29,887 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 13:19:29,889 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 13:19:29,896 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 13:19:29,900 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 13:19:29,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 13:19:29,902 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 13:19:29,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 13:19:29,917 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 13:19:29,930 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 13:19:29,931 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 13:19:29,931 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 13:19:29,933 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 13:19:29,975 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 13:19:29,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 13:19:29,977 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 13:19:29,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 13:19:29,978 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 13:19:29,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 13:19:29,978 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 13:19:29,978 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 13:19:29,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 13:19:29,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 13:19:29,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 13:19:29,979 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 13:19:29,979 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 13:19:29,980 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 13:19:29,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 13:19:29,980 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 13:19:29,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 13:19:29,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 13:19:29,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 13:19:29,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 13:19:29,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 13:19:29,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 13:19:29,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 13:19:29,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 13:19:29,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 13:19:29,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 13:19:29,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 13:19:29,982 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 13:19:29,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 13:19:29,983 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 -> false [2020-08-21 13:19:30,313 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 13:19:30,334 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 13:19:30,339 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 13:19:30,345 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 13:19:30,346 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 13:19:30,346 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-08-21 13:19:30,405 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ec0b3dd7/818daa4293ca4d7ba6a78038c2210cdd/FLAG4b8ec9ee5 [2020-08-21 13:19:30,825 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 13:19:30,826 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/locks/test_locks_8.c [2020-08-21 13:19:30,833 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ec0b3dd7/818daa4293ca4d7ba6a78038c2210cdd/FLAG4b8ec9ee5 [2020-08-21 13:19:31,236 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ec0b3dd7/818daa4293ca4d7ba6a78038c2210cdd [2020-08-21 13:19:31,244 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 13:19:31,246 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 13:19:31,247 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 13:19:31,247 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 13:19:31,250 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 13:19:31,251 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,256 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@729581a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31, skipping insertion in model container [2020-08-21 13:19:31,256 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,265 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 13:19:31,289 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 13:19:31,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:19:31,499 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 13:19:31,521 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:19:31,534 INFO L208 MainTranslator]: Completed translation [2020-08-21 13:19:31,535 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31 WrapperNode [2020-08-21 13:19:31,535 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 13:19:31,536 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 13:19:31,536 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 13:19:31,536 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 13:19:31,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,625 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,625 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,630 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,636 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (1/1) ... [2020-08-21 13:19:31,639 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 13:19:31,640 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 13:19:31,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 13:19:31,640 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 13:19:31,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (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 13:19:31,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 13:19:31,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 13:19:31,696 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 13:19:31,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 13:19:31,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 13:19:31,697 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 13:19:31,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 13:19:31,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 13:19:31,936 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 13:19:31,936 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 13:19:31,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:19:31 BoogieIcfgContainer [2020-08-21 13:19:31,942 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 13:19:31,944 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 13:19:31,944 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 13:19:31,947 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 13:19:31,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 01:19:31" (1/3) ... [2020-08-21 13:19:31,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cb433d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:19:31, skipping insertion in model container [2020-08-21 13:19:31,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:19:31" (2/3) ... [2020-08-21 13:19:31,949 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cb433d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:19:31, skipping insertion in model container [2020-08-21 13:19:31,949 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:19:31" (3/3) ... [2020-08-21 13:19:31,950 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-08-21 13:19:31,961 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 13:19:31,968 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 13:19:31,982 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 13:19:32,014 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 13:19:32,018 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 13:19:32,018 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 13:19:32,019 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 13:19:32,019 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 13:19:32,019 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 13:19:32,019 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 13:19:32,020 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 13:19:32,069 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-08-21 13:19:32,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 13:19:32,076 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,077 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,077 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,084 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-08-21 13:19:32,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971794259] [2020-08-21 13:19:32,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,282 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 13:19:32,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971794259] [2020-08-21 13:19:32,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317002972] [2020-08-21 13:19:32,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,308 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-08-21 13:19:32,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,374 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-08-21 13:19:32,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,376 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-08-21 13:19:32,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,386 INFO L225 Difference]: With dead ends: 75 [2020-08-21 13:19:32,386 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 13:19:32,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 13:19:32,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-21 13:19:32,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 13:19:32,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-08-21 13:19:32,428 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-08-21 13:19:32,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,429 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-08-21 13:19:32,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,429 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-08-21 13:19:32,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 13:19:32,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,431 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 13:19:32,431 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-08-21 13:19:32,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192545040] [2020-08-21 13:19:32,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,493 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 13:19:32,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192545040] [2020-08-21 13:19:32,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949762464] [2020-08-21 13:19:32,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,499 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-08-21 13:19:32,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,549 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-08-21 13:19:32,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,550 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-08-21 13:19:32,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,551 INFO L225 Difference]: With dead ends: 97 [2020-08-21 13:19:32,551 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 13:19:32,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 13:19:32,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-08-21 13:19:32,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 13:19:32,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-08-21 13:19:32,562 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-08-21 13:19:32,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,563 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-08-21 13:19:32,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,563 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-08-21 13:19:32,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 13:19:32,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,565 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 13:19:32,565 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,566 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-08-21 13:19:32,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258853859] [2020-08-21 13:19:32,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,620 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 13:19:32,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258853859] [2020-08-21 13:19:32,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370954820] [2020-08-21 13:19:32,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,623 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-08-21 13:19:32,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,643 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-08-21 13:19:32,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,644 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-08-21 13:19:32,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,646 INFO L225 Difference]: With dead ends: 90 [2020-08-21 13:19:32,646 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 13:19:32,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 13:19:32,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-08-21 13:19:32,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 13:19:32,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-08-21 13:19:32,657 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-08-21 13:19:32,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,657 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-08-21 13:19:32,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,657 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-08-21 13:19:32,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 13:19:32,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,659 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 13:19:32,659 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,660 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-08-21 13:19:32,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837017145] [2020-08-21 13:19:32,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,705 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 13:19:32,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837017145] [2020-08-21 13:19:32,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737824461] [2020-08-21 13:19:32,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,708 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-08-21 13:19:32,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,727 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-08-21 13:19:32,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,728 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-08-21 13:19:32,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,729 INFO L225 Difference]: With dead ends: 112 [2020-08-21 13:19:32,730 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 13:19:32,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 13:19:32,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-08-21 13:19:32,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 13:19:32,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-08-21 13:19:32,742 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-08-21 13:19:32,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,742 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-08-21 13:19:32,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,743 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-08-21 13:19:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 13:19:32,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,744 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 13:19:32,744 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-08-21 13:19:32,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488216061] [2020-08-21 13:19:32,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,785 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 13:19:32,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488216061] [2020-08-21 13:19:32,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856462326] [2020-08-21 13:19:32,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,787 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-08-21 13:19:32,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,808 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-08-21 13:19:32,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,809 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-08-21 13:19:32,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,811 INFO L225 Difference]: With dead ends: 184 [2020-08-21 13:19:32,811 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 13:19:32,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 13:19:32,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-08-21 13:19:32,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-08-21 13:19:32,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-08-21 13:19:32,825 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-08-21 13:19:32,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,825 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-08-21 13:19:32,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,826 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-08-21 13:19:32,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 13:19:32,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 13:19:32,828 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,828 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-08-21 13:19:32,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964272606] [2020-08-21 13:19:32,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:32,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:32,893 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 13:19:32,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964272606] [2020-08-21 13:19:32,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:32,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:32,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439972272] [2020-08-21 13:19:32,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:32,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:32,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:32,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,896 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-08-21 13:19:32,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:32,920 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-08-21 13:19:32,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:32,921 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-21 13:19:32,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:32,922 INFO L225 Difference]: With dead ends: 165 [2020-08-21 13:19:32,922 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 13:19:32,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:32,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 13:19:32,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-08-21 13:19:32,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 13:19:32,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-08-21 13:19:32,945 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-08-21 13:19:32,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:32,945 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-08-21 13:19:32,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:32,946 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-08-21 13:19:32,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 13:19:32,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:32,949 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:32,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 13:19:32,950 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:32,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:32,950 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-08-21 13:19:32,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:32,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511933826] [2020-08-21 13:19:32,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:32,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,026 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 13:19:33,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511933826] [2020-08-21 13:19:33,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223468812] [2020-08-21 13:19:33,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,040 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-08-21 13:19:33,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,062 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-08-21 13:19:33,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,062 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-21 13:19:33,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,064 INFO L225 Difference]: With dead ends: 204 [2020-08-21 13:19:33,064 INFO L226 Difference]: Without dead ends: 202 [2020-08-21 13:19:33,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-08-21 13:19:33,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-08-21 13:19:33,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-08-21 13:19:33,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-08-21 13:19:33,083 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-08-21 13:19:33,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,083 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-08-21 13:19:33,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,083 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-08-21 13:19:33,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 13:19:33,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,085 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 13:19:33,086 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-08-21 13:19:33,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105993689] [2020-08-21 13:19:33,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,113 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 13:19:33,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105993689] [2020-08-21 13:19:33,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327837360] [2020-08-21 13:19:33,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,116 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-08-21 13:19:33,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,135 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-08-21 13:19:33,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,136 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-21 13:19:33,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,137 INFO L225 Difference]: With dead ends: 352 [2020-08-21 13:19:33,138 INFO L226 Difference]: Without dead ends: 210 [2020-08-21 13:19:33,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-08-21 13:19:33,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-08-21 13:19:33,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-08-21 13:19:33,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-08-21 13:19:33,155 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-08-21 13:19:33,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,155 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-08-21 13:19:33,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,156 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-08-21 13:19:33,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 13:19:33,157 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 13:19:33,158 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,158 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-08-21 13:19:33,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718704850] [2020-08-21 13:19:33,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,211 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 13:19:33,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718704850] [2020-08-21 13:19:33,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815589565] [2020-08-21 13:19:33,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,213 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-08-21 13:19:33,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,232 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-08-21 13:19:33,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,232 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-08-21 13:19:33,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,234 INFO L225 Difference]: With dead ends: 312 [2020-08-21 13:19:33,234 INFO L226 Difference]: Without dead ends: 214 [2020-08-21 13:19:33,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-08-21 13:19:33,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 212. [2020-08-21 13:19:33,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-08-21 13:19:33,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 338 transitions. [2020-08-21 13:19:33,248 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 338 transitions. Word has length 21 [2020-08-21 13:19:33,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,249 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 338 transitions. [2020-08-21 13:19:33,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,249 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 338 transitions. [2020-08-21 13:19:33,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 13:19:33,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,251 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 13:19:33,251 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,251 INFO L82 PathProgramCache]: Analyzing trace with hash 91259814, now seen corresponding path program 1 times [2020-08-21 13:19:33,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1452817321] [2020-08-21 13:19:33,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,277 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 13:19:33,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1452817321] [2020-08-21 13:19:33,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905524885] [2020-08-21 13:19:33,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,280 INFO L87 Difference]: Start difference. First operand 212 states and 338 transitions. Second operand 3 states. [2020-08-21 13:19:33,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,300 INFO L93 Difference]: Finished difference Result 380 states and 616 transitions. [2020-08-21 13:19:33,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,301 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-08-21 13:19:33,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,304 INFO L225 Difference]: With dead ends: 380 [2020-08-21 13:19:33,304 INFO L226 Difference]: Without dead ends: 378 [2020-08-21 13:19:33,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-08-21 13:19:33,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 296. [2020-08-21 13:19:33,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-08-21 13:19:33,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-08-21 13:19:33,317 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-08-21 13:19:33,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,317 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-08-21 13:19:33,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,318 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-08-21 13:19:33,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 13:19:33,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,320 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 13:19:33,321 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,321 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-08-21 13:19:33,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388871547] [2020-08-21 13:19:33,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,357 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 13:19:33,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388871547] [2020-08-21 13:19:33,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083744628] [2020-08-21 13:19:33,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,360 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-08-21 13:19:33,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,399 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-08-21 13:19:33,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-08-21 13:19:33,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,403 INFO L225 Difference]: With dead ends: 684 [2020-08-21 13:19:33,403 INFO L226 Difference]: Without dead ends: 402 [2020-08-21 13:19:33,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-08-21 13:19:33,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-08-21 13:19:33,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-08-21 13:19:33,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-08-21 13:19:33,433 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-08-21 13:19:33,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,433 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-08-21 13:19:33,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,434 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-08-21 13:19:33,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 13:19:33,437 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,437 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 13:19:33,438 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-08-21 13:19:33,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740916941] [2020-08-21 13:19:33,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,477 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 13:19:33,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740916941] [2020-08-21 13:19:33,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632343012] [2020-08-21 13:19:33,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,480 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-08-21 13:19:33,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,508 INFO L93 Difference]: Finished difference Result 600 states and 916 transitions. [2020-08-21 13:19:33,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,508 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-08-21 13:19:33,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,511 INFO L225 Difference]: With dead ends: 600 [2020-08-21 13:19:33,511 INFO L226 Difference]: Without dead ends: 410 [2020-08-21 13:19:33,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-08-21 13:19:33,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 408. [2020-08-21 13:19:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-08-21 13:19:33,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 614 transitions. [2020-08-21 13:19:33,526 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 614 transitions. Word has length 22 [2020-08-21 13:19:33,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,526 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 614 transitions. [2020-08-21 13:19:33,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,526 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 614 transitions. [2020-08-21 13:19:33,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 13:19:33,527 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,528 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 13:19:33,528 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1207532573, now seen corresponding path program 1 times [2020-08-21 13:19:33,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541639097] [2020-08-21 13:19:33,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,549 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 13:19:33,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541639097] [2020-08-21 13:19:33,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29064493] [2020-08-21 13:19:33,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,552 INFO L87 Difference]: Start difference. First operand 408 states and 614 transitions. Second operand 3 states. [2020-08-21 13:19:33,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,574 INFO L93 Difference]: Finished difference Result 716 states and 1096 transitions. [2020-08-21 13:19:33,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,574 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-08-21 13:19:33,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,578 INFO L225 Difference]: With dead ends: 716 [2020-08-21 13:19:33,578 INFO L226 Difference]: Without dead ends: 714 [2020-08-21 13:19:33,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-08-21 13:19:33,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 584. [2020-08-21 13:19:33,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-08-21 13:19:33,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-08-21 13:19:33,596 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-08-21 13:19:33,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,597 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-08-21 13:19:33,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,597 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-08-21 13:19:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 13:19:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,599 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 13:19:33,599 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,599 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-08-21 13:19:33,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140235053] [2020-08-21 13:19:33,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,619 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 13:19:33,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140235053] [2020-08-21 13:19:33,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316042744] [2020-08-21 13:19:33,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,621 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-08-21 13:19:33,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,647 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-08-21 13:19:33,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,648 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-08-21 13:19:33,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,652 INFO L225 Difference]: With dead ends: 1340 [2020-08-21 13:19:33,652 INFO L226 Difference]: Without dead ends: 778 [2020-08-21 13:19:33,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-08-21 13:19:33,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-08-21 13:19:33,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-08-21 13:19:33,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-08-21 13:19:33,681 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-08-21 13:19:33,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,681 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-08-21 13:19:33,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,681 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-08-21 13:19:33,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 13:19:33,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,683 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 13:19:33,684 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-08-21 13:19:33,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458968782] [2020-08-21 13:19:33,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,705 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 13:19:33,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458968782] [2020-08-21 13:19:33,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164314687] [2020-08-21 13:19:33,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,708 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-08-21 13:19:33,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,734 INFO L93 Difference]: Finished difference Result 1164 states and 1656 transitions. [2020-08-21 13:19:33,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,734 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-08-21 13:19:33,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,738 INFO L225 Difference]: With dead ends: 1164 [2020-08-21 13:19:33,739 INFO L226 Difference]: Without dead ends: 794 [2020-08-21 13:19:33,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-08-21 13:19:33,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 792. [2020-08-21 13:19:33,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-08-21 13:19:33,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1110 transitions. [2020-08-21 13:19:33,767 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1110 transitions. Word has length 23 [2020-08-21 13:19:33,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,768 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 1110 transitions. [2020-08-21 13:19:33,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,768 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1110 transitions. [2020-08-21 13:19:33,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 13:19:33,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,770 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 13:19:33,770 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,771 INFO L82 PathProgramCache]: Analyzing trace with hash 1479576731, now seen corresponding path program 1 times [2020-08-21 13:19:33,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088931134] [2020-08-21 13:19:33,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,793 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 13:19:33,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088931134] [2020-08-21 13:19:33,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096310830] [2020-08-21 13:19:33,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,806 INFO L87 Difference]: Start difference. First operand 792 states and 1110 transitions. Second operand 3 states. [2020-08-21 13:19:33,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,850 INFO L93 Difference]: Finished difference Result 1356 states and 1928 transitions. [2020-08-21 13:19:33,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-08-21 13:19:33,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,857 INFO L225 Difference]: With dead ends: 1356 [2020-08-21 13:19:33,857 INFO L226 Difference]: Without dead ends: 1354 [2020-08-21 13:19:33,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-08-21 13:19:33,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1160. [2020-08-21 13:19:33,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1160 states. [2020-08-21 13:19:33,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions. [2020-08-21 13:19:33,901 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23 [2020-08-21 13:19:33,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:33,901 INFO L479 AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions. [2020-08-21 13:19:33,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:33,902 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions. [2020-08-21 13:19:33,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 13:19:33,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:33,904 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:33,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 13:19:33,904 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:33,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:33,905 INFO L82 PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times [2020-08-21 13:19:33,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:33,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204891401] [2020-08-21 13:19:33,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:33,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:33,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:33,930 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 13:19:33,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204891401] [2020-08-21 13:19:33,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:33,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:33,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945775198] [2020-08-21 13:19:33,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:33,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:33,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:33,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,935 INFO L87 Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states. [2020-08-21 13:19:33,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:33,976 INFO L93 Difference]: Finished difference Result 2636 states and 3560 transitions. [2020-08-21 13:19:33,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:33,976 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-08-21 13:19:33,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:33,983 INFO L225 Difference]: With dead ends: 2636 [2020-08-21 13:19:33,984 INFO L226 Difference]: Without dead ends: 1514 [2020-08-21 13:19:33,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:33,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2020-08-21 13:19:34,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512. [2020-08-21 13:19:34,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-08-21 13:19:34,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions. [2020-08-21 13:19:34,031 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23 [2020-08-21 13:19:34,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:34,032 INFO L479 AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions. [2020-08-21 13:19:34,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:34,033 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions. [2020-08-21 13:19:34,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 13:19:34,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:34,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:34,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 13:19:34,036 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:34,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:34,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times [2020-08-21 13:19:34,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:34,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917159409] [2020-08-21 13:19:34,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:34,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:34,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,060 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 13:19:34,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917159409] [2020-08-21 13:19:34,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:34,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:34,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184877493] [2020-08-21 13:19:34,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:34,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:34,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:34,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,062 INFO L87 Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states. [2020-08-21 13:19:34,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:34,115 INFO L93 Difference]: Finished difference Result 2268 states and 2968 transitions. [2020-08-21 13:19:34,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:34,116 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-08-21 13:19:34,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:34,125 INFO L225 Difference]: With dead ends: 2268 [2020-08-21 13:19:34,125 INFO L226 Difference]: Without dead ends: 1546 [2020-08-21 13:19:34,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-08-21 13:19:34,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-08-21 13:19:34,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-08-21 13:19:34,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 1990 transitions. [2020-08-21 13:19:34,201 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 1990 transitions. Word has length 24 [2020-08-21 13:19:34,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:34,201 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 1990 transitions. [2020-08-21 13:19:34,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:34,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 1990 transitions. [2020-08-21 13:19:34,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 13:19:34,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:34,204 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:34,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 13:19:34,205 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:34,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:34,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1119380424, now seen corresponding path program 1 times [2020-08-21 13:19:34,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:34,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536841124] [2020-08-21 13:19:34,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:34,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,239 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 13:19:34,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536841124] [2020-08-21 13:19:34,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:34,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:34,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153863640] [2020-08-21 13:19:34,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:34,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:34,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:34,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,242 INFO L87 Difference]: Start difference. First operand 1544 states and 1990 transitions. Second operand 3 states. [2020-08-21 13:19:34,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:34,312 INFO L93 Difference]: Finished difference Result 2572 states and 3336 transitions. [2020-08-21 13:19:34,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:34,313 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-08-21 13:19:34,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:34,329 INFO L225 Difference]: With dead ends: 2572 [2020-08-21 13:19:34,329 INFO L226 Difference]: Without dead ends: 2570 [2020-08-21 13:19:34,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2570 states. [2020-08-21 13:19:34,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2312. [2020-08-21 13:19:34,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2312 states. [2020-08-21 13:19:34,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions. [2020-08-21 13:19:34,437 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24 [2020-08-21 13:19:34,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:34,437 INFO L479 AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions. [2020-08-21 13:19:34,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:34,438 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions. [2020-08-21 13:19:34,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 13:19:34,442 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:34,442 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:34,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 13:19:34,442 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:34,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:34,443 INFO L82 PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times [2020-08-21 13:19:34,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:34,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8205510] [2020-08-21 13:19:34,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:34,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:34,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,467 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 13:19:34,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8205510] [2020-08-21 13:19:34,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:34,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:34,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971403365] [2020-08-21 13:19:34,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:34,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:34,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:34,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,469 INFO L87 Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states. [2020-08-21 13:19:34,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:34,550 INFO L93 Difference]: Finished difference Result 5196 states and 6408 transitions. [2020-08-21 13:19:34,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:34,551 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-08-21 13:19:34,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:34,564 INFO L225 Difference]: With dead ends: 5196 [2020-08-21 13:19:34,564 INFO L226 Difference]: Without dead ends: 2954 [2020-08-21 13:19:34,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-08-21 13:19:34,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952. [2020-08-21 13:19:34,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2952 states. [2020-08-21 13:19:34,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions. [2020-08-21 13:19:34,651 INFO L78 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24 [2020-08-21 13:19:34,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:34,651 INFO L479 AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions. [2020-08-21 13:19:34,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:34,651 INFO L276 IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions. [2020-08-21 13:19:34,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 13:19:34,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:34,656 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:34,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 13:19:34,658 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:34,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:34,659 INFO L82 PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times [2020-08-21 13:19:34,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:34,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104934292] [2020-08-21 13:19:34,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:34,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:34,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,681 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 13:19:34,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104934292] [2020-08-21 13:19:34,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:34,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:34,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763677654] [2020-08-21 13:19:34,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:34,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:34,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:34,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,684 INFO L87 Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states. [2020-08-21 13:19:34,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:34,738 INFO L93 Difference]: Finished difference Result 4428 states and 5256 transitions. [2020-08-21 13:19:34,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:34,739 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-08-21 13:19:34,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:34,751 INFO L225 Difference]: With dead ends: 4428 [2020-08-21 13:19:34,751 INFO L226 Difference]: Without dead ends: 3018 [2020-08-21 13:19:34,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3018 states. [2020-08-21 13:19:34,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016. [2020-08-21 13:19:34,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-08-21 13:19:34,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions. [2020-08-21 13:19:34,848 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25 [2020-08-21 13:19:34,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:34,848 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions. [2020-08-21 13:19:34,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:34,849 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions. [2020-08-21 13:19:34,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 13:19:34,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:34,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:34,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 13:19:34,875 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:34,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:34,876 INFO L82 PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times [2020-08-21 13:19:34,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:34,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665494136] [2020-08-21 13:19:34,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:34,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:34,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:34,901 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 13:19:34,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665494136] [2020-08-21 13:19:34,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:34,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:34,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085372982] [2020-08-21 13:19:34,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:34,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:34,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:34,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:34,905 INFO L87 Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states. [2020-08-21 13:19:34,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:34,997 INFO L93 Difference]: Finished difference Result 8650 states and 9799 transitions. [2020-08-21 13:19:34,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:34,998 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-08-21 13:19:34,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:35,010 INFO L225 Difference]: With dead ends: 8650 [2020-08-21 13:19:35,010 INFO L226 Difference]: Without dead ends: 3016 [2020-08-21 13:19:35,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:35,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2020-08-21 13:19:35,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016. [2020-08-21 13:19:35,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-08-21 13:19:35,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions. [2020-08-21 13:19:35,110 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25 [2020-08-21 13:19:35,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:35,111 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions. [2020-08-21 13:19:35,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:35,111 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions. [2020-08-21 13:19:35,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 13:19:35,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:19:35,116 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:19:35,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 13:19:35,118 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:19:35,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:19:35,118 INFO L82 PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times [2020-08-21 13:19:35,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:19:35,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968899455] [2020-08-21 13:19:35,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:19:35,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:35,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:19:35,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:19:35,139 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 13:19:35,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968899455] [2020-08-21 13:19:35,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:19:35,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:19:35,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717254765] [2020-08-21 13:19:35,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:19:35,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:19:35,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:19:35,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:35,143 INFO L87 Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states. [2020-08-21 13:19:35,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:19:35,183 INFO L93 Difference]: Finished difference Result 3016 states and 3270 transitions. [2020-08-21 13:19:35,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:19:35,184 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-08-21 13:19:35,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:19:35,184 INFO L225 Difference]: With dead ends: 3016 [2020-08-21 13:19:35,184 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 13:19:35,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:19:35,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 13:19:35,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 13:19:35,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 13:19:35,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 13:19:35,190 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-08-21 13:19:35,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:19:35,190 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 13:19:35,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:19:35,190 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 13:19:35,190 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 13:19:35,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 13:19:35,193 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 13:19:35,214 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 13:19:35,215 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 13:19:35,215 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 13:19:35,215 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 13:19:35,215 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 13:19:35,215 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 13:19:35,215 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-08-21 13:19:35,215 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-08-21 13:19:35,215 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-08-21 13:19:35,216 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-08-21 13:19:35,217 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-08-21 13:19:35,217 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-08-21 13:19:35,218 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,218 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,218 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-08-21 13:19:35,219 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-08-21 13:19:35,220 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-08-21 13:19:35,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 01:19:35 BoogieIcfgContainer [2020-08-21 13:19:35,234 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 13:19:35,236 INFO L168 Benchmark]: Toolchain (without parser) took 3989.80 ms. Allocated memory was 141.6 MB in the beginning and 284.7 MB in the end (delta: 143.1 MB). Free memory was 103.0 MB in the beginning and 149.3 MB in the end (delta: -46.3 MB). Peak memory consumption was 96.9 MB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,237 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.4 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,237 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.37 ms. Allocated memory is still 141.6 MB. Free memory was 103.0 MB in the beginning and 92.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,238 INFO L168 Benchmark]: Boogie Preprocessor took 103.81 ms. Allocated memory was 141.6 MB in the beginning and 202.9 MB in the end (delta: 61.3 MB). Free memory was 92.5 MB in the beginning and 180.4 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,239 INFO L168 Benchmark]: RCFGBuilder took 302.66 ms. Allocated memory is still 202.9 MB. Free memory was 180.4 MB in the beginning and 163.3 MB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,241 INFO L168 Benchmark]: TraceAbstraction took 3290.03 ms. Allocated memory was 202.9 MB in the beginning and 284.7 MB in the end (delta: 81.8 MB). Free memory was 162.4 MB in the beginning and 149.3 MB in the end (delta: 13.1 MB). Peak memory consumption was 94.9 MB. Max. memory is 7.1 GB. [2020-08-21 13:19:35,248 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 141.6 MB. Free memory was 121.8 MB in the beginning and 121.4 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 288.37 ms. Allocated memory is still 141.6 MB. Free memory was 103.0 MB in the beginning and 92.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.81 ms. Allocated memory was 141.6 MB in the beginning and 202.9 MB in the end (delta: 61.3 MB). Free memory was 92.5 MB in the beginning and 180.4 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 302.66 ms. Allocated memory is still 202.9 MB. Free memory was 180.4 MB in the beginning and 163.3 MB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3290.03 ms. Allocated memory was 202.9 MB in the beginning and 284.7 MB in the end (delta: 81.8 MB). Free memory was 162.4 MB in the beginning and 149.3 MB in the end (delta: 13.1 MB). Peak memory consumption was 94.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.1s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1573 SDtfs, 755 SDslu, 1056 SDs, 0 SdLazy, 121 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 115 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3016occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 23 MinimizatonAttempts, 790 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 498 NumberOfCodeBlocks, 498 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 23 InterpolantComputations, 23 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...