/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_init4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 00:02:26,671 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 00:02:26,676 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 00:02:26,720 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-23 00:02:26,791 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 00:02:26,825 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 00:02:26,826 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 00:02:26,829 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 00:02:26,831 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 00:02:26,831 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 00:02:26,831 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 00:02:26,832 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 00:02:26,832 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 00:02:26,832 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 00:02:26,832 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 00:02:26,833 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 00:02:26,833 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 00:02:26,833 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 00:02:26,833 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 00:02:26,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 00:02:26,834 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 00:02:26,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 00:02:26,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 00:02:26,834 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 00:02:26,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 00:02:26,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 00:02:26,836 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 00:02:26,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 00:02:26,837 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 00:02:26,837 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 00:02:26,837 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 00:02:27,376 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 00:02:27,410 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 00:02:27,414 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 00:02:27,416 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 00:02:27,417 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 00:02:27,418 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init4_ground-2.i [2020-12-23 00:02:27,522 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/5ee624025/2d490c840d0f4971a63946d3c119bdbd/FLAG4f5d1b486 [2020-12-23 00:02:28,287 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 00:02:28,288 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i [2020-12-23 00:02:28,306 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/5ee624025/2d490c840d0f4971a63946d3c119bdbd/FLAG4f5d1b486 [2020-12-23 00:02:28,645 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/5ee624025/2d490c840d0f4971a63946d3c119bdbd [2020-12-23 00:02:28,649 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 00:02:28,651 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 00:02:28,655 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 00:02:28,655 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 00:02:28,659 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 00:02:28,661 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:02:28" (1/1) ... [2020-12-23 00:02:28,664 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@683e3f7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:28, skipping insertion in model container [2020-12-23 00:02:28,664 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 12:02:28" (1/1) ... [2020-12-23 00:02:28,674 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 00:02:28,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 00:02:28,918 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i[816,829] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 00:02:28,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:02:28,956 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 00:02:28,972 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init4_ground-2.i[816,829] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 00:02:28,983 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 00:02:29,003 INFO L208 MainTranslator]: Completed translation [2020-12-23 00:02:29,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29 WrapperNode [2020-12-23 00:02:29,004 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 00:02:29,006 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 00:02:29,006 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 00:02:29,006 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 00:02:29,016 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,026 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,052 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 00:02:29,053 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 00:02:29,053 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 00:02:29,053 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 00:02:29,064 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,073 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,082 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... [2020-12-23 00:02:29,084 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 00:02:29,086 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 00:02:29,086 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 00:02:29,086 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 00:02:29,091 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 00:02:29,216 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 00:02:29,218 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 00:02:29,218 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 00:02:29,219 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 00:02:29,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 00:02:29,219 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 00:02:29,220 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 00:02:29,634 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 00:02:29,634 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-23 00:02:29,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:02:29 BoogieIcfgContainer [2020-12-23 00:02:29,640 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 00:02:29,644 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 00:02:29,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 00:02:29,656 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 00:02:29,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 12:02:28" (1/3) ... [2020-12-23 00:02:29,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b5b8c7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:02:29, skipping insertion in model container [2020-12-23 00:02:29,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 12:02:29" (2/3) ... [2020-12-23 00:02:29,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b5b8c7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 12:02:29, skipping insertion in model container [2020-12-23 00:02:29,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 12:02:29" (3/3) ... [2020-12-23 00:02:29,700 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init4_ground-2.i [2020-12-23 00:02:29,724 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 00:02:29,741 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 00:02:29,805 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 00:02:29,837 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 00:02:29,838 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 00:02:29,838 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 00:02:29,838 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 00:02:29,838 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 00:02:29,839 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 00:02:29,839 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 00:02:29,839 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 00:02:29,859 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-23 00:02:29,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 00:02:29,866 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:29,867 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:29,868 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:29,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:29,875 INFO L82 PathProgramCache]: Analyzing trace with hash 474620133, now seen corresponding path program 1 times [2020-12-23 00:02:29,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:29,887 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370919146] [2020-12-23 00:02:29,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:30,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:30,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 00:02:30,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370919146] [2020-12-23 00:02:30,107 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 00:02:30,107 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 00:02:30,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239218089] [2020-12-23 00:02:30,114 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 00:02:30,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:30,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 00:02:30,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:02:30,137 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-12-23 00:02:30,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:30,222 INFO L93 Difference]: Finished difference Result 41 states and 67 transitions. [2020-12-23 00:02:30,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 00:02:30,225 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-12-23 00:02:30,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:30,235 INFO L225 Difference]: With dead ends: 41 [2020-12-23 00:02:30,235 INFO L226 Difference]: Without dead ends: 20 [2020-12-23 00:02:30,239 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 00:02:30,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-23 00:02:30,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-23 00:02:30,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 00:02:30,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-23 00:02:30,284 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 13 [2020-12-23 00:02:30,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:30,285 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-23 00:02:30,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 00:02:30,285 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-23 00:02:30,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 00:02:30,286 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:30,287 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:30,287 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 00:02:30,287 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:30,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:30,288 INFO L82 PathProgramCache]: Analyzing trace with hash -40844573, now seen corresponding path program 1 times [2020-12-23 00:02:30,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:30,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369719816] [2020-12-23 00:02:30,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:30,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:30,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:02:30,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369719816] [2020-12-23 00:02:30,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005532178] [2020-12-23 00:02:30,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:30,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:30,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 00:02:30,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:30,556 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-23 00:02:30,557 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:30,557 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 00:02:30,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248653598] [2020-12-23 00:02:30,559 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 00:02:30,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:30,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 00:02:30,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:02:30,562 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 5 states. [2020-12-23 00:02:30,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:30,622 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2020-12-23 00:02:30,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 00:02:30,623 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-23 00:02:30,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:30,624 INFO L225 Difference]: With dead ends: 40 [2020-12-23 00:02:30,624 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 00:02:30,625 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 00:02:30,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 00:02:30,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-23 00:02:30,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 00:02:30,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-12-23 00:02:30,631 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2020-12-23 00:02:30,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:30,632 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-12-23 00:02:30,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 00:02:30,632 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-12-23 00:02:30,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 00:02:30,633 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:30,633 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:30,847 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 00:02:30,849 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:30,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:30,850 INFO L82 PathProgramCache]: Analyzing trace with hash 84997541, now seen corresponding path program 2 times [2020-12-23 00:02:30,851 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:30,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402049461] [2020-12-23 00:02:30,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:30,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:30,991 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:02:30,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402049461] [2020-12-23 00:02:30,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548249772] [2020-12-23 00:02:30,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:31,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:02:31,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:31,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 00:02:31,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:31,109 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 00:02:31,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:31,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 00:02:31,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758975056] [2020-12-23 00:02:31,111 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 00:02:31,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:31,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 00:02:31,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:02:31,113 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 6 states. [2020-12-23 00:02:31,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:31,181 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2020-12-23 00:02:31,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 00:02:31,182 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-12-23 00:02:31,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:31,183 INFO L225 Difference]: With dead ends: 47 [2020-12-23 00:02:31,183 INFO L226 Difference]: Without dead ends: 28 [2020-12-23 00:02:31,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 00:02:31,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-23 00:02:31,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-23 00:02:31,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 00:02:31,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-12-23 00:02:31,191 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2020-12-23 00:02:31,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:31,192 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-12-23 00:02:31,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 00:02:31,192 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-12-23 00:02:31,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 00:02:31,193 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:31,193 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:31,407 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:31,408 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:31,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:31,409 INFO L82 PathProgramCache]: Analyzing trace with hash 1963806883, now seen corresponding path program 3 times [2020-12-23 00:02:31,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:31,411 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056949313] [2020-12-23 00:02:31,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:31,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:31,530 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-23 00:02:31,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056949313] [2020-12-23 00:02:31,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64280781] [2020-12-23 00:02:31,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:31,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 00:02:31,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:31,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 00:02:31,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-23 00:02:31,702 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:31,702 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 00:02:31,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353885851] [2020-12-23 00:02:31,703 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 00:02:31,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:31,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 00:02:31,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:02:31,705 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2020-12-23 00:02:31,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:31,763 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2020-12-23 00:02:31,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 00:02:31,764 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-12-23 00:02:31,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:31,765 INFO L225 Difference]: With dead ends: 54 [2020-12-23 00:02:31,765 INFO L226 Difference]: Without dead ends: 32 [2020-12-23 00:02:31,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 00:02:31,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-23 00:02:31,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-23 00:02:31,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-23 00:02:31,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-12-23 00:02:31,776 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 25 [2020-12-23 00:02:31,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:31,776 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-12-23 00:02:31,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 00:02:31,776 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-12-23 00:02:31,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-23 00:02:31,780 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:31,780 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:31,981 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:31,982 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:31,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:31,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1096399461, now seen corresponding path program 4 times [2020-12-23 00:02:31,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:31,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41571867] [2020-12-23 00:02:31,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:32,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:32,062 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-12-23 00:02:32,063 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41571867] [2020-12-23 00:02:32,063 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26601380] [2020-12-23 00:02:32,064 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:32,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:02:32,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:32,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 00:02:32,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:32,186 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-12-23 00:02:32,186 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:32,187 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 00:02:32,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128989613] [2020-12-23 00:02:32,187 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 00:02:32,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:32,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 00:02:32,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:02:32,189 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 8 states. [2020-12-23 00:02:32,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:32,268 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2020-12-23 00:02:32,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 00:02:32,269 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-12-23 00:02:32,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:32,270 INFO L225 Difference]: With dead ends: 61 [2020-12-23 00:02:32,270 INFO L226 Difference]: Without dead ends: 36 [2020-12-23 00:02:32,271 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 00:02:32,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-23 00:02:32,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-23 00:02:32,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 00:02:32,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-12-23 00:02:32,278 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2020-12-23 00:02:32,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:32,278 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-12-23 00:02:32,278 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 00:02:32,279 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-12-23 00:02:32,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 00:02:32,280 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:32,280 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:32,493 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:32,494 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:32,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:32,495 INFO L82 PathProgramCache]: Analyzing trace with hash -910872989, now seen corresponding path program 5 times [2020-12-23 00:02:32,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:32,496 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618987749] [2020-12-23 00:02:32,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:32,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:32,617 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:02:32,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618987749] [2020-12-23 00:02:32,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717812168] [2020-12-23 00:02:32,619 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:32,991 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 00:02:32,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:32,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 00:02:32,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:33,059 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-23 00:02:33,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:33,060 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 00:02:33,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510811131] [2020-12-23 00:02:33,061 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 00:02:33,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:33,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 00:02:33,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:02:33,063 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 9 states. [2020-12-23 00:02:33,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:33,140 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2020-12-23 00:02:33,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 00:02:33,141 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 33 [2020-12-23 00:02:33,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:33,142 INFO L225 Difference]: With dead ends: 68 [2020-12-23 00:02:33,142 INFO L226 Difference]: Without dead ends: 40 [2020-12-23 00:02:33,143 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 00:02:33,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-23 00:02:33,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-23 00:02:33,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-23 00:02:33,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-12-23 00:02:33,150 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 33 [2020-12-23 00:02:33,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:33,151 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-12-23 00:02:33,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 00:02:33,151 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-12-23 00:02:33,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-23 00:02:33,152 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:33,152 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:33,367 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 00:02:33,368 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:33,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:33,369 INFO L82 PathProgramCache]: Analyzing trace with hash 937193253, now seen corresponding path program 6 times [2020-12-23 00:02:33,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:33,370 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377613286] [2020-12-23 00:02:33,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:33,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:33,496 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2020-12-23 00:02:33,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377613286] [2020-12-23 00:02:33,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802760446] [2020-12-23 00:02:33,497 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:33,698 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 00:02:33,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:33,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 00:02:33,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:33,763 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2020-12-23 00:02:33,764 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:33,764 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 00:02:33,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080936578] [2020-12-23 00:02:33,765 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 00:02:33,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:33,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 00:02:33,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:02:33,767 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2020-12-23 00:02:33,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:33,868 INFO L93 Difference]: Finished difference Result 75 states and 86 transitions. [2020-12-23 00:02:33,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 00:02:33,870 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-12-23 00:02:33,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:33,871 INFO L225 Difference]: With dead ends: 75 [2020-12-23 00:02:33,872 INFO L226 Difference]: Without dead ends: 44 [2020-12-23 00:02:33,872 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 00:02:33,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-23 00:02:33,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-23 00:02:33,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 00:02:33,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-12-23 00:02:33,886 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2020-12-23 00:02:33,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:33,887 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-12-23 00:02:33,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 00:02:33,887 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-12-23 00:02:33,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 00:02:33,891 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:33,891 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:34,105 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:34,106 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:34,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:34,113 INFO L82 PathProgramCache]: Analyzing trace with hash -80716765, now seen corresponding path program 7 times [2020-12-23 00:02:34,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:34,113 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381279833] [2020-12-23 00:02:34,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:34,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:34,254 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-23 00:02:34,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381279833] [2020-12-23 00:02:34,255 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970578126] [2020-12-23 00:02:34,255 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:34,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:34,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 00:02:34,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-23 00:02:34,407 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:34,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 00:02:34,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670467383] [2020-12-23 00:02:34,408 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 00:02:34,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:34,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 00:02:34,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:02:34,409 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-12-23 00:02:34,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:34,509 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2020-12-23 00:02:34,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 00:02:34,511 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-12-23 00:02:34,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:34,513 INFO L225 Difference]: With dead ends: 82 [2020-12-23 00:02:34,513 INFO L226 Difference]: Without dead ends: 48 [2020-12-23 00:02:34,514 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 00:02:34,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-23 00:02:34,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-23 00:02:34,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-23 00:02:34,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-12-23 00:02:34,522 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 41 [2020-12-23 00:02:34,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:34,522 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-12-23 00:02:34,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 00:02:34,522 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-12-23 00:02:34,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 00:02:34,523 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:34,523 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:34,732 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:34,733 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:34,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:34,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1336863771, now seen corresponding path program 8 times [2020-12-23 00:02:34,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:34,735 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112437083] [2020-12-23 00:02:34,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:34,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:34,906 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-23 00:02:34,907 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112437083] [2020-12-23 00:02:34,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11139150] [2020-12-23 00:02:34,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:34,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:02:34,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:34,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 00:02:35,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:35,087 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-12-23 00:02:35,087 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:35,088 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 00:02:35,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317496005] [2020-12-23 00:02:35,091 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 00:02:35,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:35,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 00:02:35,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:02:35,093 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 12 states. [2020-12-23 00:02:35,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:35,200 INFO L93 Difference]: Finished difference Result 89 states and 100 transitions. [2020-12-23 00:02:35,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 00:02:35,201 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-12-23 00:02:35,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:35,202 INFO L225 Difference]: With dead ends: 89 [2020-12-23 00:02:35,202 INFO L226 Difference]: Without dead ends: 52 [2020-12-23 00:02:35,203 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 00:02:35,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-23 00:02:35,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-23 00:02:35,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 00:02:35,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2020-12-23 00:02:35,210 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 45 [2020-12-23 00:02:35,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:35,211 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2020-12-23 00:02:35,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 00:02:35,211 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2020-12-23 00:02:35,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 00:02:35,212 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:35,212 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:35,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 00:02:35,426 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:35,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:35,427 INFO L82 PathProgramCache]: Analyzing trace with hash -131671581, now seen corresponding path program 9 times [2020-12-23 00:02:35,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:35,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212433006] [2020-12-23 00:02:35,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:35,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:35,605 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-12-23 00:02:35,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212433006] [2020-12-23 00:02:35,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1055911346] [2020-12-23 00:02:35,610 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:37,146 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-23 00:02:37,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:37,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 00:02:37,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-12-23 00:02:37,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:37,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 00:02:37,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504278768] [2020-12-23 00:02:37,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 00:02:37,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:37,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 00:02:37,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:02:37,232 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand 13 states. [2020-12-23 00:02:37,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:37,335 INFO L93 Difference]: Finished difference Result 96 states and 107 transitions. [2020-12-23 00:02:37,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 00:02:37,336 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 49 [2020-12-23 00:02:37,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:37,337 INFO L225 Difference]: With dead ends: 96 [2020-12-23 00:02:37,337 INFO L226 Difference]: Without dead ends: 56 [2020-12-23 00:02:37,338 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 00:02:37,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-23 00:02:37,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-23 00:02:37,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-23 00:02:37,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-12-23 00:02:37,346 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2020-12-23 00:02:37,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:37,346 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-12-23 00:02:37,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 00:02:37,346 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-12-23 00:02:37,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-23 00:02:37,347 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:37,347 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:37,560 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:37,561 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:37,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:37,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1399826597, now seen corresponding path program 10 times [2020-12-23 00:02:37,563 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:37,564 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831289280] [2020-12-23 00:02:37,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:37,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:37,776 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2020-12-23 00:02:37,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831289280] [2020-12-23 00:02:37,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773277630] [2020-12-23 00:02:37,777 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:37,854 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:02:37,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:02:37,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 00:02:37,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:02:37,936 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2020-12-23 00:02:37,937 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:02:37,937 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 00:02:37,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476087443] [2020-12-23 00:02:37,938 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 00:02:37,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:02:37,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 00:02:37,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:02:37,939 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 14 states. [2020-12-23 00:02:38,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:02:38,063 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2020-12-23 00:02:38,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 00:02:38,064 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-12-23 00:02:38,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:02:38,065 INFO L225 Difference]: With dead ends: 103 [2020-12-23 00:02:38,065 INFO L226 Difference]: Without dead ends: 60 [2020-12-23 00:02:38,067 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 00:02:38,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-23 00:02:38,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-12-23 00:02:38,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-23 00:02:38,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2020-12-23 00:02:38,092 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 53 [2020-12-23 00:02:38,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:02:38,093 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2020-12-23 00:02:38,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 00:02:38,093 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2020-12-23 00:02:38,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 00:02:38,094 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:02:38,098 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:02:38,312 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:02:38,313 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:02:38,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:02:38,316 INFO L82 PathProgramCache]: Analyzing trace with hash 507553699, now seen corresponding path program 11 times [2020-12-23 00:02:38,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:02:38,316 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451784506] [2020-12-23 00:02:38,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:02:38,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:02:38,475 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-12-23 00:02:38,476 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451784506] [2020-12-23 00:02:38,476 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828557433] [2020-12-23 00:02:38,476 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:20,248 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-23 00:03:20,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:03:20,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 00:03:20,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:20,461 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2020-12-23 00:03:20,462 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:20,462 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 00:03:20,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707185121] [2020-12-23 00:03:20,463 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 00:03:20,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:20,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 00:03:20,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:03:20,464 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 15 states. [2020-12-23 00:03:20,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:20,581 INFO L93 Difference]: Finished difference Result 110 states and 121 transitions. [2020-12-23 00:03:20,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 00:03:20,581 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 57 [2020-12-23 00:03:20,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:20,582 INFO L225 Difference]: With dead ends: 110 [2020-12-23 00:03:20,583 INFO L226 Difference]: Without dead ends: 64 [2020-12-23 00:03:20,583 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 00:03:20,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-23 00:03:20,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-12-23 00:03:20,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-23 00:03:20,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2020-12-23 00:03:20,590 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 57 [2020-12-23 00:03:20,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:20,590 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2020-12-23 00:03:20,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 00:03:20,590 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2020-12-23 00:03:20,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-23 00:03:20,591 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:20,591 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:20,804 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 00:03:20,805 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:20,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:20,806 INFO L82 PathProgramCache]: Analyzing trace with hash 720383333, now seen corresponding path program 12 times [2020-12-23 00:03:20,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:20,807 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103732414] [2020-12-23 00:03:20,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:20,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:20,989 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-12-23 00:03:20,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103732414] [2020-12-23 00:03:20,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703817821] [2020-12-23 00:03:20,990 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:34,285 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 00:03:34,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:03:34,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-23 00:03:34,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:34,389 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-12-23 00:03:34,390 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:34,390 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 00:03:34,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397168750] [2020-12-23 00:03:34,391 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 00:03:34,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:34,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 00:03:34,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:03:34,392 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 16 states. [2020-12-23 00:03:34,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:34,525 INFO L93 Difference]: Finished difference Result 117 states and 128 transitions. [2020-12-23 00:03:34,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 00:03:34,525 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 61 [2020-12-23 00:03:34,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:34,526 INFO L225 Difference]: With dead ends: 117 [2020-12-23 00:03:34,527 INFO L226 Difference]: Without dead ends: 68 [2020-12-23 00:03:34,527 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-23 00:03:34,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-23 00:03:34,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-12-23 00:03:34,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:03:34,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2020-12-23 00:03:34,534 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 61 [2020-12-23 00:03:34,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:34,535 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2020-12-23 00:03:34,535 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 00:03:34,535 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2020-12-23 00:03:34,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-23 00:03:34,536 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:34,536 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:34,751 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 00:03:34,752 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:34,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:34,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1171929757, now seen corresponding path program 13 times [2020-12-23 00:03:34,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:34,753 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761421886] [2020-12-23 00:03:34,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:34,947 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-12-23 00:03:34,947 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761421886] [2020-12-23 00:03:34,947 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832912175] [2020-12-23 00:03:34,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:35,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:35,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 00:03:35,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:35,116 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-12-23 00:03:35,117 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:35,117 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 00:03:35,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897348581] [2020-12-23 00:03:35,118 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 00:03:35,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:35,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 00:03:35,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:03:35,119 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand 17 states. [2020-12-23 00:03:35,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:35,247 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2020-12-23 00:03:35,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 00:03:35,248 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-12-23 00:03:35,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:35,248 INFO L225 Difference]: With dead ends: 124 [2020-12-23 00:03:35,248 INFO L226 Difference]: Without dead ends: 72 [2020-12-23 00:03:35,249 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-23 00:03:35,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-23 00:03:35,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-12-23 00:03:35,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-12-23 00:03:35,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-12-23 00:03:35,256 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 65 [2020-12-23 00:03:35,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:35,256 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-12-23 00:03:35,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 00:03:35,256 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-12-23 00:03:35,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-12-23 00:03:35,257 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:35,257 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:35,470 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 00:03:35,470 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:35,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:35,471 INFO L82 PathProgramCache]: Analyzing trace with hash 562733605, now seen corresponding path program 14 times [2020-12-23 00:03:35,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:35,472 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949460972] [2020-12-23 00:03:35,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:35,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:35,708 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2020-12-23 00:03:35,709 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949460972] [2020-12-23 00:03:35,709 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146896623] [2020-12-23 00:03:35,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:35,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:03:35,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:03:35,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 00:03:35,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:35,899 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2020-12-23 00:03:35,899 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:35,899 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 00:03:35,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315535756] [2020-12-23 00:03:35,900 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 00:03:35,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:35,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 00:03:35,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:03:35,901 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 18 states. [2020-12-23 00:03:36,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:36,042 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2020-12-23 00:03:36,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 00:03:36,042 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-12-23 00:03:36,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:36,043 INFO L225 Difference]: With dead ends: 131 [2020-12-23 00:03:36,043 INFO L226 Difference]: Without dead ends: 76 [2020-12-23 00:03:36,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 00:03:36,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-23 00:03:36,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-12-23 00:03:36,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-23 00:03:36,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2020-12-23 00:03:36,050 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 69 [2020-12-23 00:03:36,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:36,050 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2020-12-23 00:03:36,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 00:03:36,050 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2020-12-23 00:03:36,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-23 00:03:36,051 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:36,051 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:36,264 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:36,264 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:36,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:36,265 INFO L82 PathProgramCache]: Analyzing trace with hash -2021772509, now seen corresponding path program 15 times [2020-12-23 00:03:36,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:36,266 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123622090] [2020-12-23 00:03:36,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:36,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:36,533 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2020-12-23 00:03:36,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123622090] [2020-12-23 00:03:36,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649515908] [2020-12-23 00:03:36,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:52,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-23 00:03:52,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:03:52,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 00:03:52,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:52,573 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2020-12-23 00:03:52,574 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:52,574 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 00:03:52,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383056508] [2020-12-23 00:03:52,575 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 00:03:52,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:52,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 00:03:52,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:03:52,576 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand 19 states. [2020-12-23 00:03:52,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:52,716 INFO L93 Difference]: Finished difference Result 138 states and 149 transitions. [2020-12-23 00:03:52,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 00:03:52,716 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 73 [2020-12-23 00:03:52,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:52,717 INFO L225 Difference]: With dead ends: 138 [2020-12-23 00:03:52,717 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 00:03:52,718 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 00:03:52,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 00:03:52,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2020-12-23 00:03:52,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-12-23 00:03:52,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 84 transitions. [2020-12-23 00:03:52,724 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 84 transitions. Word has length 73 [2020-12-23 00:03:52,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:52,724 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 84 transitions. [2020-12-23 00:03:52,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 00:03:52,724 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 84 transitions. [2020-12-23 00:03:52,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-12-23 00:03:52,725 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:52,725 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:52,931 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 00:03:52,931 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:52,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:52,932 INFO L82 PathProgramCache]: Analyzing trace with hash -2097740059, now seen corresponding path program 16 times [2020-12-23 00:03:52,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:52,933 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811855985] [2020-12-23 00:03:52,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:52,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:53,206 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2020-12-23 00:03:53,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811855985] [2020-12-23 00:03:53,207 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740143176] [2020-12-23 00:03:53,207 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:03:53,306 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:03:53,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:03:53,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-23 00:03:53,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:03:53,412 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2020-12-23 00:03:53,412 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:03:53,413 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 00:03:53,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504333141] [2020-12-23 00:03:53,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 00:03:53,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:03:53,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 00:03:53,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:03:53,415 INFO L87 Difference]: Start difference. First operand 80 states and 84 transitions. Second operand 20 states. [2020-12-23 00:03:53,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:03:53,570 INFO L93 Difference]: Finished difference Result 145 states and 156 transitions. [2020-12-23 00:03:53,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 00:03:53,571 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 77 [2020-12-23 00:03:53,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:03:53,572 INFO L225 Difference]: With dead ends: 145 [2020-12-23 00:03:53,572 INFO L226 Difference]: Without dead ends: 84 [2020-12-23 00:03:53,573 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 00:03:53,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-12-23 00:03:53,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2020-12-23 00:03:53,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-23 00:03:53,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2020-12-23 00:03:53,578 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 77 [2020-12-23 00:03:53,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:03:53,578 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2020-12-23 00:03:53,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 00:03:53,579 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2020-12-23 00:03:53,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-23 00:03:53,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:03:53,579 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:03:53,795 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 00:03:53,796 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:03:53,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:03:53,797 INFO L82 PathProgramCache]: Analyzing trace with hash 821162211, now seen corresponding path program 17 times [2020-12-23 00:03:53,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:03:53,798 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258137105] [2020-12-23 00:03:53,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:03:53,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:03:54,083 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-12-23 00:03:54,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258137105] [2020-12-23 00:03:54,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650843430] [2020-12-23 00:03:54,084 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true