/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_two_index_03.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 10:01:35,431 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 10:01:35,434 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 10:01:35,476 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-01-06 10:01:35,546 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 10:01:35,548 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 10:01:35,549 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 10:01:35,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 10:01:35,583 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 10:01:35,584 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 10:01:35,585 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 10:01:35,586 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 10:01:35,586 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 10:01:35,586 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 10:01:35,587 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 10:01:35,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 10:01:35,587 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 10:01:35,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 10:01:35,588 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 10:01:35,588 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 10:01:35,588 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 10:01:35,588 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 10:01:35,589 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 10:01:35,589 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 10:01:35,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 10:01:35,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 10:01:35,589 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 10:01:35,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 10:01:35,590 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 10:01:35,590 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 10:01:35,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 10:01:35,590 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 10:01:35,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 10:01:35,591 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 10:01:36,005 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 10:01:36,050 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 10:01:36,055 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 10:01:36,057 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 10:01:36,058 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 10:01:36,059 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_03.i [2021-01-06 10:01:36,176 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8a84e81ba/f84d9c64881e4dc9a7ddbccc41100e19/FLAGf6b84ff10 [2021-01-06 10:01:36,849 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 10:01:36,850 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_03.i [2021-01-06 10:01:36,860 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8a84e81ba/f84d9c64881e4dc9a7ddbccc41100e19/FLAGf6b84ff10 [2021-01-06 10:01:37,199 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/8a84e81ba/f84d9c64881e4dc9a7ddbccc41100e19 [2021-01-06 10:01:37,203 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 10:01:37,206 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 10:01:37,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:37,209 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 10:01:37,214 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 10:01:37,216 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,219 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@105fd1bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37, skipping insertion in model container [2021-01-06 10:01:37,219 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,229 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 10:01:37,260 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 10:01:37,432 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_two_index_03.i[814,827] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~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[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2021-01-06 10:01:37,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:37,463 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 10:01:37,479 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_two_index_03.i[814,827] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#b~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#b~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[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2021-01-06 10:01:37,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:37,509 INFO L208 MainTranslator]: Completed translation [2021-01-06 10:01:37,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37 WrapperNode [2021-01-06 10:01:37,510 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:37,512 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:37,512 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 10:01:37,512 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 10:01:37,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,533 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,558 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:37,560 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 10:01:37,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 10:01:37,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 10:01:37,572 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,576 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,576 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,588 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (1/1) ... [2021-01-06 10:01:37,593 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 10:01:37,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 10:01:37,595 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 10:01:37,595 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 10:01:37,596 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (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 [2021-01-06 10:01:37,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 10:01:37,722 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 10:01:37,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 10:01:37,722 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 10:01:37,722 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 10:01:37,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 10:01:37,723 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 10:01:38,027 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 10:01:38,028 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-01-06 10:01:38,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:38 BoogieIcfgContainer [2021-01-06 10:01:38,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 10:01:38,033 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 10:01:38,033 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 10:01:38,037 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 10:01:38,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 10:01:37" (1/3) ... [2021-01-06 10:01:38,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20955b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:38, skipping insertion in model container [2021-01-06 10:01:38,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:37" (2/3) ... [2021-01-06 10:01:38,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20955b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:38, skipping insertion in model container [2021-01-06 10:01:38,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:38" (3/3) ... [2021-01-06 10:01:38,043 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_03.i [2021-01-06 10:01:38,051 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 10:01:38,056 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 10:01:38,080 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 10:01:38,112 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 10:01:38,113 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 10:01:38,113 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 10:01:38,113 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 10:01:38,113 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 10:01:38,113 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 10:01:38,113 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 10:01:38,114 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 10:01:38,133 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2021-01-06 10:01:38,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 10:01:38,141 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:38,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:38,142 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:38,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:38,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2021-01-06 10:01:38,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:38,165 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542724589] [2021-01-06 10:01:38,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:38,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:38,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542724589] [2021-01-06 10:01:38,425 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:38,426 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 10:01:38,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877750108] [2021-01-06 10:01:38,434 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:38,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:38,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:38,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 10:01:38,456 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2021-01-06 10:01:38,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:38,508 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2021-01-06 10:01:38,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:38,510 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2021-01-06 10:01:38,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:38,524 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:38,525 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 10:01:38,528 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 [2021-01-06 10:01:38,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 10:01:38,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 10:01:38,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 10:01:38,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-01-06 10:01:38,576 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2021-01-06 10:01:38,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:38,576 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-01-06 10:01:38,577 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:38,577 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-01-06 10:01:38,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 10:01:38,578 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:38,578 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:38,578 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 10:01:38,579 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:38,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:38,580 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2021-01-06 10:01:38,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:38,581 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185210512] [2021-01-06 10:01:38,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:38,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:38,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:38,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185210512] [2021-01-06 10:01:38,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742333197] [2021-01-06 10:01:38,691 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 [2021-01-06 10:01:38,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:38,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2021-01-06 10:01:38,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:38,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:38,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 10:01:38,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2021-01-06 10:01:38,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912915237] [2021-01-06 10:01:38,843 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:38,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:38,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:38,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:38,845 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2021-01-06 10:01:38,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:38,878 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-01-06 10:01:38,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:38,879 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2021-01-06 10:01:38,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:38,880 INFO L225 Difference]: With dead ends: 24 [2021-01-06 10:01:38,880 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 10:01:38,882 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:38,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 10:01:38,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2021-01-06 10:01:38,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 10:01:38,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-01-06 10:01:38,887 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2021-01-06 10:01:38,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:38,887 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-01-06 10:01:38,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:38,888 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-01-06 10:01:38,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 10:01:38,888 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:38,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:39,102 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 10:01:39,104 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:39,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:39,106 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2021-01-06 10:01:39,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:39,108 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002161355] [2021-01-06 10:01:39,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:39,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:39,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:39,185 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002161355] [2021-01-06 10:01:39,185 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186580198] [2021-01-06 10:01:39,185 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 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 [2021-01-06 10:01:39,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:39,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 10:01:39,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:39,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:39,348 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:39,349 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 10:01:39,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717773695] [2021-01-06 10:01:39,350 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 10:01:39,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:39,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 10:01:39,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:39,352 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2021-01-06 10:01:39,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:39,417 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-01-06 10:01:39,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 10:01:39,418 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2021-01-06 10:01:39,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:39,419 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:39,419 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 10:01:39,420 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:39,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 10:01:39,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2021-01-06 10:01:39,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 10:01:39,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-01-06 10:01:39,434 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2021-01-06 10:01:39,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:39,450 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-01-06 10:01:39,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 10:01:39,451 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-01-06 10:01:39,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 10:01:39,451 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:39,451 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:39,669 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:39,672 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:39,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:39,674 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2021-01-06 10:01:39,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:39,678 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445360592] [2021-01-06 10:01:39,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:39,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:39,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:39,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445360592] [2021-01-06 10:01:39,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479021208] [2021-01-06 10:01:39,829 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 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 [2021-01-06 10:01:39,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:39,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:39,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:39,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:39,999 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:40,000 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:40,001 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-01-06 10:01:40,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152552997] [2021-01-06 10:01:40,003 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 10:01:40,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:40,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 10:01:40,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:40,011 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2021-01-06 10:01:40,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:40,119 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-01-06 10:01:40,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 10:01:40,120 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2021-01-06 10:01:40,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:40,122 INFO L225 Difference]: With dead ends: 36 [2021-01-06 10:01:40,123 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 10:01:40,123 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:40,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 10:01:40,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2021-01-06 10:01:40,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 10:01:40,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-01-06 10:01:40,134 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-01-06 10:01:40,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:40,135 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-01-06 10:01:40,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 10:01:40,135 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-01-06 10:01:40,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 10:01:40,136 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:40,136 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:40,350 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:40,351 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:40,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:40,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2021-01-06 10:01:40,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:40,354 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507979361] [2021-01-06 10:01:40,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:40,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:40,445 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:40,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507979361] [2021-01-06 10:01:40,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755954876] [2021-01-06 10:01:40,446 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 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 [2021-01-06 10:01:40,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 10:01:40,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:40,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:40,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:40,539 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:40,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:40,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 10:01:40,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718717110] [2021-01-06 10:01:40,540 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 10:01:40,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:40,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 10:01:40,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:40,542 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2021-01-06 10:01:40,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:40,589 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-01-06 10:01:40,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 10:01:40,590 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2021-01-06 10:01:40,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:40,591 INFO L225 Difference]: With dead ends: 39 [2021-01-06 10:01:40,591 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 10:01:40,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:40,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 10:01:40,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2021-01-06 10:01:40,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 10:01:40,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-01-06 10:01:40,598 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-01-06 10:01:40,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:40,598 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-01-06 10:01:40,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 10:01:40,598 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-01-06 10:01:40,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 10:01:40,599 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:40,599 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:40,813 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:40,814 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:40,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:40,816 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2021-01-06 10:01:40,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:40,817 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248943921] [2021-01-06 10:01:40,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:40,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:40,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248943921] [2021-01-06 10:01:40,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555424532] [2021-01-06 10:01:40,934 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 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 [2021-01-06 10:01:40,997 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:40,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:40,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 10:01:41,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-01-06 10:01:41,084 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:41,084 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-01-06 10:01:41,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489725364] [2021-01-06 10:01:41,085 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 10:01:41,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:41,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 10:01:41,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2021-01-06 10:01:41,087 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 10 states. [2021-01-06 10:01:41,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:41,146 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-01-06 10:01:41,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 10:01:41,147 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2021-01-06 10:01:41,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:41,147 INFO L225 Difference]: With dead ends: 53 [2021-01-06 10:01:41,148 INFO L226 Difference]: Without dead ends: 42 [2021-01-06 10:01:41,148 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2021-01-06 10:01:41,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-01-06 10:01:41,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 22. [2021-01-06 10:01:41,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-01-06 10:01:41,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-01-06 10:01:41,154 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 16 [2021-01-06 10:01:41,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:41,154 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-01-06 10:01:41,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 10:01:41,155 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-01-06 10:01:41,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-01-06 10:01:41,155 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:41,156 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:41,369 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 10:01:41,370 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:41,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:41,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1213738189, now seen corresponding path program 5 times [2021-01-06 10:01:41,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:41,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743165658] [2021-01-06 10:01:41,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:41,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:41,458 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 10:01:41,461 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743165658] [2021-01-06 10:01:41,461 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741417550] [2021-01-06 10:01:41,461 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 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 [2021-01-06 10:01:41,591 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-01-06 10:01:41,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:41,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2021-01-06 10:01:41,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:41,668 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:41,668 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:41,668 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 13 [2021-01-06 10:01:41,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209655960] [2021-01-06 10:01:41,669 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 10:01:41,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:41,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 10:01:41,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2021-01-06 10:01:41,670 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 13 states. [2021-01-06 10:01:41,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:41,750 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2021-01-06 10:01:41,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 10:01:41,750 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2021-01-06 10:01:41,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:41,751 INFO L225 Difference]: With dead ends: 63 [2021-01-06 10:01:41,752 INFO L226 Difference]: Without dead ends: 51 [2021-01-06 10:01:41,752 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2021-01-06 10:01:41,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-01-06 10:01:41,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 26. [2021-01-06 10:01:41,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-01-06 10:01:41,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-01-06 10:01:41,758 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 20 [2021-01-06 10:01:41,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:41,759 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-01-06 10:01:41,759 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 10:01:41,759 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-01-06 10:01:41,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 10:01:41,760 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:41,760 INFO L422 BasicCegarLoop]: trace histogram [10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:41,973 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:41,975 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:41,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:41,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1232303186, now seen corresponding path program 6 times [2021-01-06 10:01:41,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:41,977 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458982151] [2021-01-06 10:01:41,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:42,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,119 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:01:42,119 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458982151] [2021-01-06 10:01:42,120 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253222153] [2021-01-06 10:01:42,120 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 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 [2021-01-06 10:01:42,332 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-01-06 10:01:42,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:42,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 10:01:42,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:01:42,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:42,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 10:01:42,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735199455] [2021-01-06 10:01:42,384 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 10:01:42,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:42,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 10:01:42,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:42,385 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2021-01-06 10:01:42,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:42,460 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2021-01-06 10:01:42,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 10:01:42,461 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2021-01-06 10:01:42,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:42,462 INFO L225 Difference]: With dead ends: 63 [2021-01-06 10:01:42,462 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 10:01:42,462 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:42,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 10:01:42,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 27. [2021-01-06 10:01:42,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-01-06 10:01:42,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-01-06 10:01:42,468 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 24 [2021-01-06 10:01:42,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:42,469 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-01-06 10:01:42,469 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 10:01:42,469 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-01-06 10:01:42,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-01-06 10:01:42,470 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:42,470 INFO L422 BasicCegarLoop]: trace histogram [10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:42,683 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:42,684 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:42,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:42,686 INFO L82 PathProgramCache]: Analyzing trace with hash -401860744, now seen corresponding path program 7 times [2021-01-06 10:01:42,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:42,687 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702685696] [2021-01-06 10:01:42,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:42,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,783 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:01:42,783 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702685696] [2021-01-06 10:01:42,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771959476] [2021-01-06 10:01:42,784 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 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 [2021-01-06 10:01:42,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 10:01:42,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:43,004 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-01-06 10:01:43,005 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:43,005 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 17 [2021-01-06 10:01:43,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134204019] [2021-01-06 10:01:43,006 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 10:01:43,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:43,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 10:01:43,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2021-01-06 10:01:43,008 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 17 states. [2021-01-06 10:01:43,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:43,138 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2021-01-06 10:01:43,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-01-06 10:01:43,138 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 25 [2021-01-06 10:01:43,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:43,139 INFO L225 Difference]: With dead ends: 81 [2021-01-06 10:01:43,139 INFO L226 Difference]: Without dead ends: 67 [2021-01-06 10:01:43,140 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2021-01-06 10:01:43,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-01-06 10:01:43,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 32. [2021-01-06 10:01:43,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-01-06 10:01:43,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-01-06 10:01:43,146 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2021-01-06 10:01:43,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:43,147 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-01-06 10:01:43,147 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 10:01:43,147 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-01-06 10:01:43,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 10:01:43,148 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:43,148 INFO L422 BasicCegarLoop]: trace histogram [14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:43,362 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-01-06 10:01:43,363 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:43,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:43,364 INFO L82 PathProgramCache]: Analyzing trace with hash -734025134, now seen corresponding path program 8 times [2021-01-06 10:01:43,364 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:43,365 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577309137] [2021-01-06 10:01:43,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:43,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:43,470 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-01-06 10:01:43,471 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577309137] [2021-01-06 10:01:43,471 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134320118] [2021-01-06 10:01:43,471 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 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 [2021-01-06 10:01:43,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:43,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:43,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 10:01:43,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:43,692 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 10:01:43,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:43,693 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17] total 21 [2021-01-06 10:01:43,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939328088] [2021-01-06 10:01:43,694 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 10:01:43,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:43,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 10:01:43,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2021-01-06 10:01:43,696 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 21 states. [2021-01-06 10:01:43,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:43,831 INFO L93 Difference]: Finished difference Result 92 states and 100 transitions. [2021-01-06 10:01:43,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 10:01:43,832 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2021-01-06 10:01:43,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:43,833 INFO L225 Difference]: With dead ends: 92 [2021-01-06 10:01:43,833 INFO L226 Difference]: Without dead ends: 77 [2021-01-06 10:01:43,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2021-01-06 10:01:43,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-01-06 10:01:43,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 37. [2021-01-06 10:01:43,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-01-06 10:01:43,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-01-06 10:01:43,841 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2021-01-06 10:01:43,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:43,841 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-01-06 10:01:43,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-01-06 10:01:43,841 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-01-06 10:01:43,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-01-06 10:01:43,842 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:43,843 INFO L422 BasicCegarLoop]: trace histogram [18, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:44,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:44,057 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:44,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:44,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1266653240, now seen corresponding path program 9 times [2021-01-06 10:01:44,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:44,059 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074366656] [2021-01-06 10:01:44,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:44,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:44,197 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-01-06 10:01:44,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074366656] [2021-01-06 10:01:44,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543019342] [2021-01-06 10:01:44,197 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 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 [2021-01-06 10:01:44,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-01-06 10:01:44,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:44,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:44,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:44,455 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-01-06 10:01:44,456 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:44,456 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 10:01:44,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029284601] [2021-01-06 10:01:44,458 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 10:01:44,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:44,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 10:01:44,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:44,459 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 12 states. [2021-01-06 10:01:44,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:44,544 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2021-01-06 10:01:44,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 10:01:44,544 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2021-01-06 10:01:44,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:44,545 INFO L225 Difference]: With dead ends: 89 [2021-01-06 10:01:44,546 INFO L226 Difference]: Without dead ends: 83 [2021-01-06 10:01:44,546 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:44,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-01-06 10:01:44,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 38. [2021-01-06 10:01:44,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-01-06 10:01:44,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-01-06 10:01:44,552 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-01-06 10:01:44,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:44,553 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-01-06 10:01:44,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 10:01:44,553 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-01-06 10:01:44,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-01-06 10:01:44,554 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:44,554 INFO L422 BasicCegarLoop]: trace histogram [18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:44,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:44,769 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:44,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:44,770 INFO L82 PathProgramCache]: Analyzing trace with hash 662990930, now seen corresponding path program 10 times [2021-01-06 10:01:44,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:44,771 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634151266] [2021-01-06 10:01:44,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:44,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-01-06 10:01:44,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634151266] [2021-01-06 10:01:44,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281069805] [2021-01-06 10:01:44,896 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 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 [2021-01-06 10:01:44,985 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:44,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:44,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 10:01:44,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-01-06 10:01:45,180 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:45,181 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21] total 26 [2021-01-06 10:01:45,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711897522] [2021-01-06 10:01:45,181 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-01-06 10:01:45,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:45,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-01-06 10:01:45,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2021-01-06 10:01:45,183 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 26 states. [2021-01-06 10:01:45,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:45,330 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2021-01-06 10:01:45,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-01-06 10:01:45,330 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2021-01-06 10:01:45,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:45,331 INFO L225 Difference]: With dead ends: 111 [2021-01-06 10:01:45,331 INFO L226 Difference]: Without dead ends: 94 [2021-01-06 10:01:45,332 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2021-01-06 10:01:45,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-01-06 10:01:45,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 44. [2021-01-06 10:01:45,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 10:01:45,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-01-06 10:01:45,339 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2021-01-06 10:01:45,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:45,339 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-01-06 10:01:45,340 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2021-01-06 10:01:45,340 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-01-06 10:01:45,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-01-06 10:01:45,341 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:45,341 INFO L422 BasicCegarLoop]: trace histogram [23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:45,555 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 10:01:45,556 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:45,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:45,557 INFO L82 PathProgramCache]: Analyzing trace with hash -409368141, now seen corresponding path program 11 times [2021-01-06 10:01:45,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:45,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502183655] [2021-01-06 10:01:45,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:45,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:45,696 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-01-06 10:01:45,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502183655] [2021-01-06 10:01:45,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435866907] [2021-01-06 10:01:45,697 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 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 [2021-01-06 10:02:09,002 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-01-06 10:02:09,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:09,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 25 conjunts are in the unsatisfiable core [2021-01-06 10:02:09,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:09,268 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:02:09,269 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:09,269 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 26] total 30 [2021-01-06 10:02:09,269 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102775898] [2021-01-06 10:02:09,270 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-01-06 10:02:09,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:09,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-01-06 10:02:09,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=436, Unknown=0, NotChecked=0, Total=870 [2021-01-06 10:02:09,272 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 30 states. [2021-01-06 10:02:09,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:09,469 INFO L93 Difference]: Finished difference Result 122 states and 130 transitions. [2021-01-06 10:02:09,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 10:02:09,470 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 42 [2021-01-06 10:02:09,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:09,471 INFO L225 Difference]: With dead ends: 122 [2021-01-06 10:02:09,471 INFO L226 Difference]: Without dead ends: 104 [2021-01-06 10:02:09,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=434, Invalid=436, Unknown=0, NotChecked=0, Total=870 [2021-01-06 10:02:09,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-01-06 10:02:09,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 49. [2021-01-06 10:02:09,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2021-01-06 10:02:09,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-01-06 10:02:09,479 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 42 [2021-01-06 10:02:09,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:09,479 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-01-06 10:02:09,479 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2021-01-06 10:02:09,479 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-01-06 10:02:09,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-01-06 10:02:09,480 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:09,480 INFO L422 BasicCegarLoop]: trace histogram [27, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:09,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 10:02:09,681 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:09,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:09,682 INFO L82 PathProgramCache]: Analyzing trace with hash 434472183, now seen corresponding path program 12 times [2021-01-06 10:02:09,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:09,683 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872652689] [2021-01-06 10:02:09,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:09,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:09,863 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-01-06 10:02:09,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872652689] [2021-01-06 10:02:09,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930577824] [2021-01-06 10:02:09,864 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 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 [2021-01-06 10:02:23,004 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 10:02:23,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:23,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 10:02:23,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:23,111 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-01-06 10:02:23,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:23,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 10:02:23,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090919189] [2021-01-06 10:02:23,113 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 10:02:23,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:23,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 10:02:23,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:02:23,114 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 15 states. [2021-01-06 10:02:23,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:23,242 INFO L93 Difference]: Finished difference Result 116 states and 119 transitions. [2021-01-06 10:02:23,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 10:02:23,242 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2021-01-06 10:02:23,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:23,244 INFO L225 Difference]: With dead ends: 116 [2021-01-06 10:02:23,244 INFO L226 Difference]: Without dead ends: 110 [2021-01-06 10:02:23,245 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:02:23,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-01-06 10:02:23,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 50. [2021-01-06 10:02:23,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 10:02:23,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-01-06 10:02:23,252 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2021-01-06 10:02:23,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:23,253 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-01-06 10:02:23,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 10:02:23,253 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-01-06 10:02:23,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-01-06 10:02:23,254 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:23,254 INFO L422 BasicCegarLoop]: trace histogram [27, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:23,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 10:02:23,455 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:23,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:23,456 INFO L82 PathProgramCache]: Analyzing trace with hash 635181939, now seen corresponding path program 13 times [2021-01-06 10:02:23,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:23,457 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182605016] [2021-01-06 10:02:23,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:23,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:23,673 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-01-06 10:02:23,674 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182605016] [2021-01-06 10:02:23,674 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74876858] [2021-01-06 10:02:23,674 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 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 [2021-01-06 10:02:23,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:23,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 10:02:23,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:24,137 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:02:24,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:24,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 30] total 35 [2021-01-06 10:02:24,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122296535] [2021-01-06 10:02:24,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-01-06 10:02:24,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:24,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-01-06 10:02:24,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 10:02:24,143 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 35 states. [2021-01-06 10:02:24,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:24,379 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-01-06 10:02:24,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 10:02:24,380 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 48 [2021-01-06 10:02:24,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:24,383 INFO L225 Difference]: With dead ends: 141 [2021-01-06 10:02:24,383 INFO L226 Difference]: Without dead ends: 121 [2021-01-06 10:02:24,388 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 10:02:24,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-01-06 10:02:24,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 56. [2021-01-06 10:02:24,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 10:02:24,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2021-01-06 10:02:24,401 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 48 [2021-01-06 10:02:24,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:24,401 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2021-01-06 10:02:24,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2021-01-06 10:02:24,401 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2021-01-06 10:02:24,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-01-06 10:02:24,404 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:24,404 INFO L422 BasicCegarLoop]: trace histogram [32, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:24,618 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:24,619 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:24,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:24,620 INFO L82 PathProgramCache]: Analyzing trace with hash 796181042, now seen corresponding path program 14 times [2021-01-06 10:02:24,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:24,620 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469718190] [2021-01-06 10:02:24,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:24,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:24,880 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2021-01-06 10:02:24,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469718190] [2021-01-06 10:02:24,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194871246] [2021-01-06 10:02:24,881 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 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 [2021-01-06 10:02:24,980 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:02:24,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:24,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 34 conjunts are in the unsatisfiable core [2021-01-06 10:02:24,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:25,353 INFO L134 CoverageAnalysis]: Checked inductivity of 619 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:02:25,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:25,354 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 35] total 39 [2021-01-06 10:02:25,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25767584] [2021-01-06 10:02:25,354 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-01-06 10:02:25,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:25,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-01-06 10:02:25,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:02:25,356 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 39 states. [2021-01-06 10:02:25,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:25,593 INFO L93 Difference]: Finished difference Result 152 states and 160 transitions. [2021-01-06 10:02:25,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-01-06 10:02:25,594 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 54 [2021-01-06 10:02:25,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:25,595 INFO L225 Difference]: With dead ends: 152 [2021-01-06 10:02:25,595 INFO L226 Difference]: Without dead ends: 131 [2021-01-06 10:02:25,596 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:02:25,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-01-06 10:02:25,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 61. [2021-01-06 10:02:25,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2021-01-06 10:02:25,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-01-06 10:02:25,603 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 54 [2021-01-06 10:02:25,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:25,604 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-01-06 10:02:25,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2021-01-06 10:02:25,604 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-01-06 10:02:25,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-01-06 10:02:25,605 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:25,605 INFO L422 BasicCegarLoop]: trace histogram [36, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:25,818 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 10:02:25,819 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:25,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:25,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1025850456, now seen corresponding path program 15 times [2021-01-06 10:02:25,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:25,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33822686] [2021-01-06 10:02:25,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:25,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:26,029 INFO L134 CoverageAnalysis]: Checked inductivity of 771 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2021-01-06 10:02:26,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33822686] [2021-01-06 10:02:26,030 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497202971] [2021-01-06 10:02:26,030 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 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 [2021-01-06 10:02:28,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-01-06 10:02:28,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:28,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 10:02:28,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:28,150 INFO L134 CoverageAnalysis]: Checked inductivity of 771 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2021-01-06 10:02:28,151 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:28,151 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-01-06 10:02:28,151 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459066278] [2021-01-06 10:02:28,153 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 10:02:28,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:28,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 10:02:28,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:02:28,158 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 18 states. [2021-01-06 10:02:28,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:28,292 INFO L93 Difference]: Finished difference Result 143 states and 146 transitions. [2021-01-06 10:02:28,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 10:02:28,293 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 59 [2021-01-06 10:02:28,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:28,294 INFO L225 Difference]: With dead ends: 143 [2021-01-06 10:02:28,294 INFO L226 Difference]: Without dead ends: 137 [2021-01-06 10:02:28,299 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:02:28,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-01-06 10:02:28,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 62. [2021-01-06 10:02:28,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 10:02:28,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-01-06 10:02:28,308 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2021-01-06 10:02:28,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:28,308 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-01-06 10:02:28,308 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 10:02:28,309 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-01-06 10:02:28,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-01-06 10:02:28,309 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:28,309 INFO L422 BasicCegarLoop]: trace histogram [36, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:28,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 10:02:28,523 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:28,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:28,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1788039218, now seen corresponding path program 16 times [2021-01-06 10:02:28,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:28,524 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172901805] [2021-01-06 10:02:28,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:28,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:28,745 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2021-01-06 10:02:28,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172901805] [2021-01-06 10:02:28,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479632944] [2021-01-06 10:02:28,746 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 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 [2021-01-06 10:02:28,843 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:02:28,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:28,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 38 conjunts are in the unsatisfiable core [2021-01-06 10:02:28,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:29,234 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-01-06 10:02:29,234 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:29,234 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 39] total 44 [2021-01-06 10:02:29,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247565017] [2021-01-06 10:02:29,235 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-01-06 10:02:29,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:29,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-01-06 10:02:29,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=945, Invalid=947, Unknown=0, NotChecked=0, Total=1892 [2021-01-06 10:02:29,236 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 44 states. [2021-01-06 10:02:29,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:29,512 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2021-01-06 10:02:29,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-01-06 10:02:29,512 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 60 [2021-01-06 10:02:29,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:29,513 INFO L225 Difference]: With dead ends: 171 [2021-01-06 10:02:29,514 INFO L226 Difference]: Without dead ends: 148 [2021-01-06 10:02:29,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=945, Invalid=947, Unknown=0, NotChecked=0, Total=1892 [2021-01-06 10:02:29,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-01-06 10:02:29,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 68. [2021-01-06 10:02:29,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 10:02:29,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-01-06 10:02:29,520 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 60 [2021-01-06 10:02:29,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:29,521 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-01-06 10:02:29,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2021-01-06 10:02:29,521 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-01-06 10:02:29,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-01-06 10:02:29,522 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:29,522 INFO L422 BasicCegarLoop]: trace histogram [41, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:29,737 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 10:02:29,738 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:29,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:29,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1260283091, now seen corresponding path program 17 times [2021-01-06 10:02:29,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:29,739 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225069328] [2021-01-06 10:02:29,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:29,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:30,057 INFO L134 CoverageAnalysis]: Checked inductivity of 997 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2021-01-06 10:02:30,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225069328] [2021-01-06 10:02:30,057 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307881807] [2021-01-06 10:02:30,057 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true