/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_08.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 10:01:46,819 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 10:01:46,823 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 10:01:46,876 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-01-06 10:01:46,931 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 10:01:46,932 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 10:01:46,937 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 10:01:46,938 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 10:01:47,004 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 10:01:47,004 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 10:01:47,008 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 10:01:47,009 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 10:01:47,009 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 10:01:47,009 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 10:01:47,010 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 10:01:47,010 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 10:01:47,010 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 10:01:47,010 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 10:01:47,012 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 10:01:47,012 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 10:01:47,012 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 10:01:47,012 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 10:01:47,012 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 10:01:47,013 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 10:01:47,013 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 10:01:47,013 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 10:01:47,013 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 10:01:47,013 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 10:01:47,014 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 10:01:47,014 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 10:01:47,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 10:01:47,014 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 10:01:47,014 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 10:01:47,015 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 10:01:47,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 10:01:47,497 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 10:01:47,501 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 10:01:47,502 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 10:01:47,503 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 10:01:47,504 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_08.i [2021-01-06 10:01:47,582 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9d4667421/e5491e86597a4a479013334fc3d32cb0/FLAG8f93243af [2021-01-06 10:01:48,162 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 10:01:48,163 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_08.i [2021-01-06 10:01:48,172 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9d4667421/e5491e86597a4a479013334fc3d32cb0/FLAG8f93243af [2021-01-06 10:01:48,515 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9d4667421/e5491e86597a4a479013334fc3d32cb0 [2021-01-06 10:01:48,518 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 10:01:48,521 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 10:01:48,522 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:48,523 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 10:01:48,527 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 10:01:48,528 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,529 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79933bd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48, skipping insertion in model container [2021-01-06 10:01:48,529 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,537 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 10:01:48,553 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 10:01:48,715 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_08.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 10:01:48,736 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:48,746 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 10:01:48,762 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_08.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 10:01:48,776 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:48,794 INFO L208 MainTranslator]: Completed translation [2021-01-06 10:01:48,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48 WrapperNode [2021-01-06 10:01:48,795 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:48,796 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:48,797 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 10:01:48,797 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 10:01:48,807 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,816 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,840 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:48,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 10:01:48,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 10:01:48,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 10:01:48,852 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,853 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,855 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,861 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,866 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (1/1) ... [2021-01-06 10:01:48,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 10:01:48,871 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 10:01:48,871 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 10:01:48,871 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 10:01:48,872 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (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 10:01:48,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 10:01:48,992 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 10:01:48,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 10:01:48,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 10:01:48,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 10:01:48,993 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 10:01:48,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 10:01:49,320 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 10:01:49,320 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-01-06 10:01:49,322 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:49 BoogieIcfgContainer [2021-01-06 10:01:49,322 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 10:01:49,323 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 10:01:49,324 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 10:01:49,327 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 10:01:49,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 10:01:48" (1/3) ... [2021-01-06 10:01:49,328 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12950e04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:49, skipping insertion in model container [2021-01-06 10:01:49,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:48" (2/3) ... [2021-01-06 10:01:49,329 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12950e04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:49, skipping insertion in model container [2021-01-06 10:01:49,329 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:49" (3/3) ... [2021-01-06 10:01:49,330 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_08.i [2021-01-06 10:01:49,337 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 10:01:49,341 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 10:01:49,359 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 10:01:49,385 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 10:01:49,385 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 10:01:49,385 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 10:01:49,385 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 10:01:49,385 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 10:01:49,386 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 10:01:49,386 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 10:01:49,386 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 10:01:49,399 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2021-01-06 10:01:49,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 10:01:49,405 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:49,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:49,406 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:49,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:49,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2021-01-06 10:01:49,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:49,477 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404070276] [2021-01-06 10:01:49,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:49,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:49,680 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 10:01:49,681 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404070276] [2021-01-06 10:01:49,682 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:49,682 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 10:01:49,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412897014] [2021-01-06 10:01:49,689 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:49,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:49,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:49,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 10:01:49,711 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2021-01-06 10:01:49,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:49,773 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2021-01-06 10:01:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:49,776 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2021-01-06 10:01:49,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:49,787 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:49,787 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 10:01:49,791 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 10:01:49,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 10:01:49,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 10:01:49,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 10:01:49,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-01-06 10:01:49,838 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2021-01-06 10:01:49,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:49,838 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-01-06 10:01:49,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:49,839 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-01-06 10:01:49,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 10:01:49,839 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:49,840 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:49,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 10:01:49,841 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:49,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:49,842 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2021-01-06 10:01:49,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:49,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831730394] [2021-01-06 10:01:49,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:49,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:49,953 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 10:01:49,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831730394] [2021-01-06 10:01:49,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723830317] [2021-01-06 10:01:49,954 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 10:01:50,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:50,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2021-01-06 10:01:50,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:50,153 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 10:01:50,153 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 10:01:50,154 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2021-01-06 10:01:50,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351423740] [2021-01-06 10:01:50,157 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:50,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:50,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:50,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:50,164 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2021-01-06 10:01:50,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:50,213 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-01-06 10:01:50,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:50,214 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2021-01-06 10:01:50,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:50,215 INFO L225 Difference]: With dead ends: 24 [2021-01-06 10:01:50,216 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 10:01:50,217 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 10:01:50,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 10:01:50,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2021-01-06 10:01:50,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 10:01:50,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-01-06 10:01:50,221 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2021-01-06 10:01:50,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:50,222 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-01-06 10:01:50,222 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:50,222 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-01-06 10:01:50,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 10:01:50,223 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:50,223 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:50,436 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 10:01:50,437 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:50,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:50,439 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2021-01-06 10:01:50,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:50,440 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091466171] [2021-01-06 10:01:50,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:50,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:50,521 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 10:01:50,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091466171] [2021-01-06 10:01:50,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358988043] [2021-01-06 10:01:50,522 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 10:01:50,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:50,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 10:01:50,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:50,659 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 10:01:50,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:50,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 10:01:50,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057457125] [2021-01-06 10:01:50,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 10:01:50,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:50,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 10:01:50,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:50,662 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2021-01-06 10:01:50,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:50,707 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-01-06 10:01:50,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 10:01:50,708 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2021-01-06 10:01:50,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:50,709 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:50,709 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 10:01:50,710 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 10:01:50,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 10:01:50,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2021-01-06 10:01:50,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 10:01:50,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-01-06 10:01:50,715 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2021-01-06 10:01:50,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:50,716 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-01-06 10:01:50,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 10:01:50,716 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-01-06 10:01:50,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 10:01:50,717 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:50,717 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:50,930 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:50,932 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:50,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:50,934 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2021-01-06 10:01:50,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:50,934 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647438788] [2021-01-06 10:01:50,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:50,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:51,045 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 10:01:51,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647438788] [2021-01-06 10:01:51,046 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659488274] [2021-01-06 10:01:51,046 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 10:01:51,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:51,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:51,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:51,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:51,202 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 10:01:51,203 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:51,203 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-01-06 10:01:51,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560749100] [2021-01-06 10:01:51,204 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 10:01:51,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:51,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 10:01:51,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:51,205 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2021-01-06 10:01:51,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:51,375 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-01-06 10:01:51,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 10:01:51,377 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2021-01-06 10:01:51,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:51,378 INFO L225 Difference]: With dead ends: 36 [2021-01-06 10:01:51,378 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 10:01:51,379 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 10:01:51,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 10:01:51,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2021-01-06 10:01:51,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 10:01:51,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-01-06 10:01:51,385 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-01-06 10:01:51,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:51,386 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-01-06 10:01:51,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 10:01:51,386 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-01-06 10:01:51,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 10:01:51,387 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:51,387 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:51,601 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:51,602 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:51,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:51,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2021-01-06 10:01:51,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:51,605 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216790366] [2021-01-06 10:01:51,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:51,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:51,709 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 10:01:51,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216790366] [2021-01-06 10:01:51,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146912817] [2021-01-06 10:01:51,710 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 10:01:51,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 10:01:51,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:51,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:51,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:51,836 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 10:01:51,837 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:51,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 10:01:51,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003093989] [2021-01-06 10:01:51,838 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 10:01:51,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:51,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 10:01:51,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:51,840 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2021-01-06 10:01:51,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:51,905 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-01-06 10:01:51,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 10:01:51,906 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2021-01-06 10:01:51,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:51,907 INFO L225 Difference]: With dead ends: 39 [2021-01-06 10:01:51,908 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 10:01:51,908 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 10:01:51,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 10:01:51,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2021-01-06 10:01:51,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 10:01:51,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-01-06 10:01:51,914 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-01-06 10:01:51,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:51,914 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-01-06 10:01:51,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 10:01:51,915 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-01-06 10:01:51,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 10:01:51,915 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:51,916 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:52,129 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:52,130 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:52,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:52,132 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2021-01-06 10:01:52,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:52,133 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664375333] [2021-01-06 10:01:52,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:52,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:52,274 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 10:01:52,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664375333] [2021-01-06 10:01:52,275 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870819123] [2021-01-06 10:01:52,275 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 10:01:52,356 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:52,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:52,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 10:01:52,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:52,467 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 10:01:52,468 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:52,468 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2021-01-06 10:01:52,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333158965] [2021-01-06 10:01:52,469 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 10:01:52,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:52,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 10:01:52,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2021-01-06 10:01:52,470 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2021-01-06 10:01:52,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:52,584 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2021-01-06 10:01:52,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 10:01:52,585 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2021-01-06 10:01:52,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:52,586 INFO L225 Difference]: With dead ends: 54 [2021-01-06 10:01:52,586 INFO L226 Difference]: Without dead ends: 43 [2021-01-06 10:01:52,587 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2021-01-06 10:01:52,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-01-06 10:01:52,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 23. [2021-01-06 10:01:52,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 10:01:52,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-01-06 10:01:52,593 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-01-06 10:01:52,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:52,593 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-01-06 10:01:52,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 10:01:52,593 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-01-06 10:01:52,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-01-06 10:01:52,594 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:52,594 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:52,807 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 10:01:52,808 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:52,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:52,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1003861208, now seen corresponding path program 5 times [2021-01-06 10:01:52,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:52,810 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324297128] [2021-01-06 10:01:52,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:52,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:52,926 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 10:01:52,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324297128] [2021-01-06 10:01:52,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226746204] [2021-01-06 10:01:52,927 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 10:01:53,096 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-01-06 10:01:53,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:53,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:53,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:53,311 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:53,311 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:53,311 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2021-01-06 10:01:53,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654945361] [2021-01-06 10:01:53,312 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 10:01:53,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:53,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 10:01:53,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2021-01-06 10:01:53,314 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 16 states. [2021-01-06 10:01:53,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:53,465 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2021-01-06 10:01:53,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-01-06 10:01:53,465 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2021-01-06 10:01:53,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:53,466 INFO L225 Difference]: With dead ends: 66 [2021-01-06 10:01:53,467 INFO L226 Difference]: Without dead ends: 54 [2021-01-06 10:01:53,467 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2021-01-06 10:01:53,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-01-06 10:01:53,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 29. [2021-01-06 10:01:53,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-01-06 10:01:53,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-01-06 10:01:53,474 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2021-01-06 10:01:53,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:53,474 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-01-06 10:01:53,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 10:01:53,475 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-01-06 10:01:53,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-01-06 10:01:53,476 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:53,476 INFO L422 BasicCegarLoop]: trace histogram [13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:53,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:53,692 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:53,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:53,693 INFO L82 PathProgramCache]: Analyzing trace with hash -676746537, now seen corresponding path program 6 times [2021-01-06 10:01:53,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:53,694 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019563012] [2021-01-06 10:01:53,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:53,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:53,785 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:01:53,785 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019563012] [2021-01-06 10:01:53,786 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437129448] [2021-01-06 10:01:53,786 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 10:01:54,088 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 10:01:54,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:54,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 10:01:54,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:54,179 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:01:54,179 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:54,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 10:01:54,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927042323] [2021-01-06 10:01:54,180 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 10:01:54,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:54,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 10:01:54,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:54,182 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 9 states. [2021-01-06 10:01:54,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:54,254 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-01-06 10:01:54,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 10:01:54,254 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2021-01-06 10:01:54,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:54,255 INFO L225 Difference]: With dead ends: 66 [2021-01-06 10:01:54,255 INFO L226 Difference]: Without dead ends: 60 [2021-01-06 10:01:54,256 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 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 10:01:54,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-01-06 10:01:54,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 30. [2021-01-06 10:01:54,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 10:01:54,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-01-06 10:01:54,262 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-01-06 10:01:54,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:54,263 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-01-06 10:01:54,263 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 10:01:54,263 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-01-06 10:01:54,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-01-06 10:01:54,264 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:54,264 INFO L422 BasicCegarLoop]: trace histogram [13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:54,472 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:54,473 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:54,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:54,475 INFO L82 PathProgramCache]: Analyzing trace with hash 547139987, now seen corresponding path program 7 times [2021-01-06 10:01:54,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:54,476 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804058282] [2021-01-06 10:01:54,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:54,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:01:54,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804058282] [2021-01-06 10:01:54,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044164510] [2021-01-06 10:01:54,605 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 10:01:54,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:54,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 10:01:54,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:54,881 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-01-06 10:01:54,881 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:54,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 16] total 22 [2021-01-06 10:01:54,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49316967] [2021-01-06 10:01:54,882 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-01-06 10:01:54,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:54,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-01-06 10:01:54,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2021-01-06 10:01:54,884 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 22 states. [2021-01-06 10:01:55,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:55,031 INFO L93 Difference]: Finished difference Result 86 states and 96 transitions. [2021-01-06 10:01:55,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-01-06 10:01:55,032 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 28 [2021-01-06 10:01:55,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:55,033 INFO L225 Difference]: With dead ends: 86 [2021-01-06 10:01:55,033 INFO L226 Difference]: Without dead ends: 72 [2021-01-06 10:01:55,034 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2021-01-06 10:01:55,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-01-06 10:01:55,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 37. [2021-01-06 10:01:55,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-01-06 10:01:55,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-01-06 10:01:55,041 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 28 [2021-01-06 10:01:55,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:55,041 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-01-06 10:01:55,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-01-06 10:01:55,041 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-01-06 10:01:55,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-01-06 10:01:55,042 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:55,043 INFO L422 BasicCegarLoop]: trace histogram [19, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:55,255 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-01-06 10:01:55,256 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:55,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:55,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1365801079, now seen corresponding path program 8 times [2021-01-06 10:01:55,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:55,258 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036603520] [2021-01-06 10:01:55,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:55,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:55,369 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-01-06 10:01:55,369 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036603520] [2021-01-06 10:01:55,369 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146898625] [2021-01-06 10:01:55,370 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 10:01:55,449 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:55,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:55,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 21 conjunts are in the unsatisfiable core [2021-01-06 10:01:55,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:55,724 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 10:01:55,725 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:55,725 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 22] total 28 [2021-01-06 10:01:55,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653608305] [2021-01-06 10:01:55,726 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 10:01:55,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:55,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 10:01:55,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=379, Unknown=0, NotChecked=0, Total=756 [2021-01-06 10:01:55,727 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 28 states. [2021-01-06 10:01:55,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:55,925 INFO L93 Difference]: Finished difference Result 99 states and 109 transitions. [2021-01-06 10:01:55,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-01-06 10:01:55,925 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2021-01-06 10:01:55,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:55,926 INFO L225 Difference]: With dead ends: 99 [2021-01-06 10:01:55,926 INFO L226 Difference]: Without dead ends: 84 [2021-01-06 10:01:55,927 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=377, Invalid=379, Unknown=0, NotChecked=0, Total=756 [2021-01-06 10:01:55,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-01-06 10:01:55,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 44. [2021-01-06 10:01:55,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 10:01:55,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-01-06 10:01:55,934 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2021-01-06 10:01:55,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:55,935 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-01-06 10:01:55,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 10:01:55,935 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-01-06 10:01:55,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-01-06 10:01:55,936 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:55,936 INFO L422 BasicCegarLoop]: trace histogram [25, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:56,149 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:56,150 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:56,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:56,151 INFO L82 PathProgramCache]: Analyzing trace with hash -838959661, now seen corresponding path program 9 times [2021-01-06 10:01:56,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:56,152 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525142506] [2021-01-06 10:01:56,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:56,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:56,325 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 10:01:56,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525142506] [2021-01-06 10:01:56,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506198475] [2021-01-06 10:01:56,327 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 10:01:56,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-01-06 10:01:56,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:56,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:56,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:56,699 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 10:01:56,700 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:56,700 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 10:01:56,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28575784] [2021-01-06 10:01:56,703 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 10:01:56,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:56,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 10:01:56,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:56,704 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2021-01-06 10:01:56,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:56,791 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2021-01-06 10:01:56,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 10:01:56,791 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2021-01-06 10:01:56,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:56,792 INFO L225 Difference]: With dead ends: 96 [2021-01-06 10:01:56,792 INFO L226 Difference]: Without dead ends: 90 [2021-01-06 10:01:56,793 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 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 10:01:56,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-01-06 10:01:56,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 45. [2021-01-06 10:01:56,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2021-01-06 10:01:56,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-01-06 10:01:56,801 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 42 [2021-01-06 10:01:56,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:56,801 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-01-06 10:01:56,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 10:01:56,802 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-01-06 10:01:56,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-01-06 10:01:56,803 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:56,803 INFO L422 BasicCegarLoop]: trace histogram [25, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:57,016 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:57,017 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:57,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:57,018 INFO L82 PathProgramCache]: Analyzing trace with hash -186499561, now seen corresponding path program 10 times [2021-01-06 10:01:57,019 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:57,019 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129697031] [2021-01-06 10:01:57,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:57,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:57,160 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 10:01:57,161 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129697031] [2021-01-06 10:01:57,161 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735656163] [2021-01-06 10:01:57,161 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 10:01:57,245 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:57,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:57,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 10:01:57,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:57,591 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-01-06 10:01:57,592 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:57,592 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 28] total 35 [2021-01-06 10:01:57,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189438617] [2021-01-06 10:01:57,592 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-01-06 10:01:57,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:57,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-01-06 10:01:57,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 10:01:57,595 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 35 states. [2021-01-06 10:01:57,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:57,779 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2021-01-06 10:01:57,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 10:01:57,780 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 43 [2021-01-06 10:01:57,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:57,781 INFO L225 Difference]: With dead ends: 120 [2021-01-06 10:01:57,781 INFO L226 Difference]: Without dead ends: 103 [2021-01-06 10:01:57,782 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=594, Invalid=596, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 10:01:57,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-01-06 10:01:57,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 53. [2021-01-06 10:01:57,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2021-01-06 10:01:57,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-01-06 10:01:57,799 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 43 [2021-01-06 10:01:57,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:57,802 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-01-06 10:01:57,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2021-01-06 10:01:57,802 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-01-06 10:01:57,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-01-06 10:01:57,804 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:57,805 INFO L422 BasicCegarLoop]: trace histogram [32, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:58,019 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 10:01:58,020 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:58,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:58,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1335836904, now seen corresponding path program 11 times [2021-01-06 10:01:58,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:58,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326989757] [2021-01-06 10:01:58,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:58,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:58,180 INFO L134 CoverageAnalysis]: Checked inductivity of 583 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2021-01-06 10:01:58,181 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326989757] [2021-01-06 10:01:58,181 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704880568] [2021-01-06 10:01:58,181 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 10:03:44,007 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-01-06 10:03:44,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:44,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 34 conjunts are in the unsatisfiable core [2021-01-06 10:03:44,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:44,568 INFO L134 CoverageAnalysis]: Checked inductivity of 583 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:03:44,568 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:44,569 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 35] total 43 [2021-01-06 10:03:44,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748408019] [2021-01-06 10:03:44,569 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-01-06 10:03:44,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:44,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-01-06 10:03:44,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=902, Invalid=904, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:03:44,572 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 43 states. [2021-01-06 10:03:44,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:44,800 INFO L93 Difference]: Finished difference Result 135 states and 147 transitions. [2021-01-06 10:03:44,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-01-06 10:03:44,801 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 51 [2021-01-06 10:03:44,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:44,802 INFO L225 Difference]: With dead ends: 135 [2021-01-06 10:03:44,802 INFO L226 Difference]: Without dead ends: 117 [2021-01-06 10:03:44,804 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=902, Invalid=904, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:03:44,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-01-06 10:03:44,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 62. [2021-01-06 10:03:44,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 10:03:44,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-01-06 10:03:44,812 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 51 [2021-01-06 10:03:44,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:44,812 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-01-06 10:03:44,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2021-01-06 10:03:44,813 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-01-06 10:03:44,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-01-06 10:03:44,814 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:44,814 INFO L422 BasicCegarLoop]: trace histogram [40, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:45,028 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 10:03:45,029 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:45,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:45,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1244198926, now seen corresponding path program 12 times [2021-01-06 10:03:45,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:45,031 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539973582] [2021-01-06 10:03:45,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:45,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:45,274 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2021-01-06 10:03:45,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539973582] [2021-01-06 10:03:45,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027206472] [2021-01-06 10:03:45,278 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 10:03:53,945 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 10:03:53,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:53,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 10:03:53,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:54,048 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2021-01-06 10:03:54,048 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:54,048 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 10:03:54,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889424870] [2021-01-06 10:03:54,049 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 10:03:54,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:54,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 10:03:54,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:03:54,050 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 15 states. [2021-01-06 10:03:54,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:54,153 INFO L93 Difference]: Finished difference Result 129 states and 132 transitions. [2021-01-06 10:03:54,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 10:03:54,154 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 60 [2021-01-06 10:03:54,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:54,155 INFO L225 Difference]: With dead ends: 129 [2021-01-06 10:03:54,155 INFO L226 Difference]: Without dead ends: 123 [2021-01-06 10:03:54,155 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 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 10:03:54,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-01-06 10:03:54,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 63. [2021-01-06 10:03:54,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2021-01-06 10:03:54,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-01-06 10:03:54,162 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 60 [2021-01-06 10:03:54,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:54,163 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-01-06 10:03:54,163 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 10:03:54,163 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-01-06 10:03:54,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-01-06 10:03:54,164 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:54,164 INFO L422 BasicCegarLoop]: trace histogram [40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:54,374 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 10:03:54,375 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:54,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:54,376 INFO L82 PathProgramCache]: Analyzing trace with hash 135985112, now seen corresponding path program 13 times [2021-01-06 10:03:54,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:54,377 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85350644] [2021-01-06 10:03:54,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:54,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:54,569 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2021-01-06 10:03:54,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85350644] [2021-01-06 10:03:54,570 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025486966] [2021-01-06 10:03:54,570 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 10:03:54,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:54,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 42 conjunts are in the unsatisfiable core [2021-01-06 10:03:54,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:55,178 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:03:55,178 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:55,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 43] total 52 [2021-01-06 10:03:55,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125580130] [2021-01-06 10:03:55,179 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-01-06 10:03:55,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:55,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-01-06 10:03:55,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1325, Invalid=1327, Unknown=0, NotChecked=0, Total=2652 [2021-01-06 10:03:55,182 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 52 states. [2021-01-06 10:03:55,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:55,460 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-01-06 10:03:55,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-01-06 10:03:55,461 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 61 [2021-01-06 10:03:55,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:55,462 INFO L225 Difference]: With dead ends: 158 [2021-01-06 10:03:55,463 INFO L226 Difference]: Without dead ends: 138 [2021-01-06 10:03:55,467 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1767 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1325, Invalid=1327, Unknown=0, NotChecked=0, Total=2652 [2021-01-06 10:03:55,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-01-06 10:03:55,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 73. [2021-01-06 10:03:55,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2021-01-06 10:03:55,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-01-06 10:03:55,486 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 61 [2021-01-06 10:03:55,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:55,486 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-01-06 10:03:55,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2021-01-06 10:03:55,486 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-01-06 10:03:55,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-01-06 10:03:55,490 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:55,490 INFO L422 BasicCegarLoop]: trace histogram [49, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:55,704 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:55,705 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:55,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:55,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1086887319, now seen corresponding path program 14 times [2021-01-06 10:03:55,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:55,707 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687747921] [2021-01-06 10:03:55,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:55,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:55,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1316 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2021-01-06 10:03:55,961 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687747921] [2021-01-06 10:03:55,962 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499099648] [2021-01-06 10:03:55,962 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 10:03:56,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:03:56,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:56,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 51 conjunts are in the unsatisfiable core [2021-01-06 10:03:56,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:56,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1316 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:03:56,710 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:56,710 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 52] total 60 [2021-01-06 10:03:56,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069086550] [2021-01-06 10:03:56,711 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-01-06 10:03:56,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:56,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-01-06 10:03:56,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1769, Invalid=1771, Unknown=0, NotChecked=0, Total=3540 [2021-01-06 10:03:56,714 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 60 states. [2021-01-06 10:03:57,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:57,026 INFO L93 Difference]: Finished difference Result 173 states and 185 transitions. [2021-01-06 10:03:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-01-06 10:03:57,027 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 71 [2021-01-06 10:03:57,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:57,029 INFO L225 Difference]: With dead ends: 173 [2021-01-06 10:03:57,029 INFO L226 Difference]: Without dead ends: 152 [2021-01-06 10:03:57,032 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2457 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1769, Invalid=1771, Unknown=0, NotChecked=0, Total=3540 [2021-01-06 10:03:57,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-01-06 10:03:57,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2021-01-06 10:03:57,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2021-01-06 10:03:57,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2021-01-06 10:03:57,038 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 71 [2021-01-06 10:03:57,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:57,039 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2021-01-06 10:03:57,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2021-01-06 10:03:57,039 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2021-01-06 10:03:57,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-01-06 10:03:57,040 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:57,040 INFO L422 BasicCegarLoop]: trace histogram [57, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:57,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 10:03:57,247 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:57,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:57,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1956626771, now seen corresponding path program 15 times [2021-01-06 10:03:57,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:57,248 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766782822] [2021-01-06 10:03:57,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:57,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:57,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2021-01-06 10:03:57,492 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766782822] [2021-01-06 10:03:57,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043300782] [2021-01-06 10:03:57,493 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 10:03:59,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-01-06 10:03:59,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:04:00,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 10:04:00,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:04:00,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1758 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2021-01-06 10:04:00,107 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:04:00,107 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-01-06 10:04:00,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010066702] [2021-01-06 10:04:00,112 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 10:04:00,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:04:00,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 10:04:00,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:04:00,117 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 18 states. [2021-01-06 10:04:00,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:04:00,245 INFO L93 Difference]: Finished difference Result 164 states and 167 transitions. [2021-01-06 10:04:00,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 10:04:00,246 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 80 [2021-01-06 10:04:00,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:04:00,249 INFO L225 Difference]: With dead ends: 164 [2021-01-06 10:04:00,249 INFO L226 Difference]: Without dead ends: 158 [2021-01-06 10:04:00,251 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 80 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 10:04:00,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-01-06 10:04:00,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 83. [2021-01-06 10:04:00,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2021-01-06 10:04:00,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-01-06 10:04:00,261 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 80 [2021-01-06 10:04:00,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:04:00,261 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-01-06 10:04:00,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 10:04:00,261 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-01-06 10:04:00,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-01-06 10:04:00,261 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:04:00,262 INFO L422 BasicCegarLoop]: trace histogram [57, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:04:00,462 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 10:04:00,463 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:04:00,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:04:00,464 INFO L82 PathProgramCache]: Analyzing trace with hash 577333911, now seen corresponding path program 16 times [2021-01-06 10:04:00,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:04:00,464 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810255756] [2021-01-06 10:04:00,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:04:00,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:04:00,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1773 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2021-01-06 10:04:00,737 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810255756] [2021-01-06 10:04:00,737 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098168530] [2021-01-06 10:04:00,737 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 10:04:00,870 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:04:00,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:04:00,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 59 conjunts are in the unsatisfiable core [2021-01-06 10:04:00,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:04:01,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1773 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-01-06 10:04:01,624 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:04:01,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 60] total 69 [2021-01-06 10:04:01,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874294289] [2021-01-06 10:04:01,625 INFO L461 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-01-06 10:04:01,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:04:01,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-01-06 10:04:01,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2345, Invalid=2347, Unknown=0, NotChecked=0, Total=4692 [2021-01-06 10:04:01,628 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 69 states. [2021-01-06 10:04:02,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:04:02,059 INFO L93 Difference]: Finished difference Result 196 states and 209 transitions. [2021-01-06 10:04:02,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-01-06 10:04:02,059 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 81 [2021-01-06 10:04:02,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:04:02,061 INFO L225 Difference]: With dead ends: 196 [2021-01-06 10:04:02,061 INFO L226 Difference]: Without dead ends: 173 [2021-01-06 10:04:02,063 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3361 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=2345, Invalid=2347, Unknown=0, NotChecked=0, Total=4692 [2021-01-06 10:04:02,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-01-06 10:04:02,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 93. [2021-01-06 10:04:02,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2021-01-06 10:04:02,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-01-06 10:04:02,069 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 81 [2021-01-06 10:04:02,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:04:02,070 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-01-06 10:04:02,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2021-01-06 10:04:02,070 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-01-06 10:04:02,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-01-06 10:04:02,071 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:04:02,071 INFO L422 BasicCegarLoop]: trace histogram [66, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:04:02,286 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 10:04:02,287 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:04:02,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:04:02,288 INFO L82 PathProgramCache]: Analyzing trace with hash 129242680, now seen corresponding path program 17 times [2021-01-06 10:04:02,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:04:02,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650050840] [2021-01-06 10:04:02,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:04:02,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:04:02,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2347 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 2211 trivial. 0 not checked. [2021-01-06 10:04:02,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650050840] [2021-01-06 10:04:02,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357373689] [2021-01-06 10:04:02,604 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