/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-programs/copysome1-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 22:10:14,701 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 22:10:14,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 22:10:14,779 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 22:10:14,780 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 22:10:14,786 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 22:10:14,791 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 22:10:14,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 22:10:14,806 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 22:10:14,813 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 22:10:14,815 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 22:10:14,817 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 22:10:14,818 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 22:10:14,821 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 22:10:14,824 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 22:10:14,841 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 22:10:14,843 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 22:10:14,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 22:10:14,858 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 22:10:14,867 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 22:10:14,869 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 22:10:14,872 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 22:10:14,874 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 22:10:14,877 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 22:10:14,886 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 22:10:14,900 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 22:10:14,901 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 22:10:14,902 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 22:10:14,908 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 22:10:14,967 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 22:10:14,967 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 22:10:14,972 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 22:10:14,973 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 22:10:14,973 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 22:10:14,973 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 22:10:14,973 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 22:10:14,974 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 22:10:14,974 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 22:10:14,974 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 22:10:14,976 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 22:10:14,976 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 22:10:14,976 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 22:10:14,976 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 22:10:14,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 22:10:14,977 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 22:10:14,977 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 22:10:14,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 22:10:14,978 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 22:10:14,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 22:10:14,979 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 22:10:14,979 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 22:10:14,979 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 22:10:14,979 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 22:10:14,979 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 22:10:14,980 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/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 22:10:15,486 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 22:10:15,517 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 22:10:15,520 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 22:10:15,522 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 22:10:15,523 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 22:10:15,527 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-programs/copysome1-2.i [2020-12-21 22:10:15,643 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbe5c7989/48b7b66777fe4ece935785f895b7e025/FLAGac52517f0 [2020-12-21 22:10:16,361 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 22:10:16,362 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-programs/copysome1-2.i [2020-12-21 22:10:16,373 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbe5c7989/48b7b66777fe4ece935785f895b7e025/FLAGac52517f0 [2020-12-21 22:10:16,690 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbe5c7989/48b7b66777fe4ece935785f895b7e025 [2020-12-21 22:10:16,693 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 22:10:16,695 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 22:10:16,703 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 22:10:16,703 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 22:10:16,708 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 22:10:16,709 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,712 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fafc37e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16, skipping insertion in model container [2020-12-21 22:10:16,712 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:16,722 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 22:10:16,743 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 22:10:16,905 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-programs/copysome1-2.i[805,818] [2020-12-21 22:10:16,925 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 22:10:16,936 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 22:10:16,951 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-programs/copysome1-2.i[805,818] [2020-12-21 22:10:16,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 22:10:16,977 INFO L208 MainTranslator]: Completed translation [2020-12-21 22:10:16,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16 WrapperNode [2020-12-21 22:10:16,981 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 22:10:16,983 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 22:10:16,983 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 22:10:16,983 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 22:10:16,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,002 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,027 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 22:10:17,028 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 22:10:17,028 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 22:10:17,028 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 22:10:17,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,039 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,042 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,048 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,054 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,056 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... [2020-12-21 22:10:17,059 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 22:10:17,060 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 22:10:17,060 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 22:10:17,060 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 22:10:17,062 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 22:10:17,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 22:10:17,166 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 22:10:17,167 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 22:10:17,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 22:10:17,167 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 22:10:17,167 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 22:10:17,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 22:10:17,577 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 22:10:17,580 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 22:10:17,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 10:10:17 BoogieIcfgContainer [2020-12-21 22:10:17,586 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 22:10:17,588 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 22:10:17,589 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 22:10:17,600 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 22:10:17,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 10:10:16" (1/3) ... [2020-12-21 22:10:17,605 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c3cf18d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 10:10:17, skipping insertion in model container [2020-12-21 22:10:17,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 10:10:16" (2/3) ... [2020-12-21 22:10:17,606 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c3cf18d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 10:10:17, skipping insertion in model container [2020-12-21 22:10:17,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 10:10:17" (3/3) ... [2020-12-21 22:10:17,611 INFO L111 eAbstractionObserver]: Analyzing ICFG copysome1-2.i [2020-12-21 22:10:17,632 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 22:10:17,648 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 22:10:17,690 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 22:10:17,741 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 22:10:17,742 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 22:10:17,742 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 22:10:17,742 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 22:10:17,742 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 22:10:17,742 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 22:10:17,743 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 22:10:17,743 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 22:10:17,760 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-21 22:10:17,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 22:10:17,766 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:17,767 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:17,767 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:17,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:17,775 INFO L82 PathProgramCache]: Analyzing trace with hash -2060710478, now seen corresponding path program 1 times [2020-12-21 22:10:17,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:17,788 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135607210] [2020-12-21 22:10:17,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:17,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:17,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 22:10:17,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135607210] [2020-12-21 22:10:17,975 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 22:10:17,975 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-21 22:10:17,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470821298] [2020-12-21 22:10:17,983 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-21 22:10:17,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:18,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-21 22:10:18,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 22:10:18,006 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-12-21 22:10:18,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:18,028 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2020-12-21 22:10:18,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-21 22:10:18,030 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-12-21 22:10:18,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:18,040 INFO L225 Difference]: With dead ends: 36 [2020-12-21 22:10:18,041 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 22:10:18,045 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-21 22:10:18,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 22:10:18,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-21 22:10:18,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 22:10:18,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-12-21 22:10:18,090 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 10 [2020-12-21 22:10:18,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:18,091 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-12-21 22:10:18,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-21 22:10:18,091 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-12-21 22:10:18,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-21 22:10:18,092 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:18,092 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:18,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 22:10:18,093 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:18,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:18,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1919336157, now seen corresponding path program 1 times [2020-12-21 22:10:18,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:18,094 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593347568] [2020-12-21 22:10:18,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:18,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 22:10:18,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593347568] [2020-12-21 22:10:18,199 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 22:10:18,199 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 22:10:18,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460035254] [2020-12-21 22:10:18,203 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 22:10:18,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:18,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 22:10:18,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 22:10:18,211 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 3 states. [2020-12-21 22:10:18,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:18,292 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2020-12-21 22:10:18,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 22:10:18,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-12-21 22:10:18,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:18,293 INFO L225 Difference]: With dead ends: 33 [2020-12-21 22:10:18,294 INFO L226 Difference]: Without dead ends: 21 [2020-12-21 22:10:18,295 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 22:10:18,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-21 22:10:18,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-12-21 22:10:18,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 22:10:18,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-21 22:10:18,301 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-12-21 22:10:18,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:18,301 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-21 22:10:18,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 22:10:18,301 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-21 22:10:18,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 22:10:18,302 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:18,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:18,303 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-21 22:10:18,303 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:18,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:18,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1458340319, now seen corresponding path program 1 times [2020-12-21 22:10:18,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:18,304 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350105602] [2020-12-21 22:10:18,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:18,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 22:10:18,356 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350105602] [2020-12-21 22:10:18,356 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905315690] [2020-12-21 22:10:18,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:18,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 22:10:18,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:18,519 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 22:10:18,519 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:18,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 22:10:18,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122158513] [2020-12-21 22:10:18,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 22:10:18,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:18,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 22:10:18,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 22:10:18,523 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 5 states. [2020-12-21 22:10:18,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:18,577 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-12-21 22:10:18,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 22:10:18,578 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-12-21 22:10:18,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:18,579 INFO L225 Difference]: With dead ends: 39 [2020-12-21 22:10:18,579 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 22:10:18,580 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 22:10:18,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 22:10:18,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-12-21 22:10:18,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-21 22:10:18,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2020-12-21 22:10:18,586 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 15 [2020-12-21 22:10:18,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:18,586 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2020-12-21 22:10:18,587 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 22:10:18,587 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2020-12-21 22:10:18,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-21 22:10:18,588 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:18,588 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:18,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-21 22:10:18,805 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:18,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:18,807 INFO L82 PathProgramCache]: Analyzing trace with hash -2030845279, now seen corresponding path program 2 times [2020-12-21 22:10:18,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:18,808 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463848510] [2020-12-21 22:10:18,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:18,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:18,903 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 22:10:18,903 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463848510] [2020-12-21 22:10:18,904 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700439030] [2020-12-21 22:10:18,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:18,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:10:18,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:18,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 22:10:18,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:19,009 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-21 22:10:19,010 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:19,010 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 22:10:19,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48460474] [2020-12-21 22:10:19,011 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 22:10:19,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:19,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 22:10:19,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 22:10:19,013 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand 6 states. [2020-12-21 22:10:19,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:19,113 INFO L93 Difference]: Finished difference Result 47 states and 60 transitions. [2020-12-21 22:10:19,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 22:10:19,115 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-12-21 22:10:19,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:19,116 INFO L225 Difference]: With dead ends: 47 [2020-12-21 22:10:19,117 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 22:10:19,117 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 22:10:19,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 22:10:19,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-12-21 22:10:19,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 22:10:19,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-12-21 22:10:19,127 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 20 [2020-12-21 22:10:19,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:19,127 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-12-21 22:10:19,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 22:10:19,128 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-12-21 22:10:19,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 22:10:19,129 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:19,129 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:19,344 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:19,345 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:19,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:19,347 INFO L82 PathProgramCache]: Analyzing trace with hash -224231843, now seen corresponding path program 3 times [2020-12-21 22:10:19,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:19,348 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527095960] [2020-12-21 22:10:19,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:19,488 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 22:10:19,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527095960] [2020-12-21 22:10:19,490 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846356144] [2020-12-21 22:10:19,490 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:19,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-21 22:10:19,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:19,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 22:10:19,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:19,599 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-12-21 22:10:19,600 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:19,600 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 22:10:19,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672951204] [2020-12-21 22:10:19,601 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 22:10:19,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:19,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 22:10:19,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 22:10:19,602 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 7 states. [2020-12-21 22:10:19,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:19,665 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2020-12-21 22:10:19,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 22:10:19,666 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-12-21 22:10:19,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:19,667 INFO L225 Difference]: With dead ends: 55 [2020-12-21 22:10:19,667 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 22:10:19,668 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 22:10:19,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 22:10:19,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-12-21 22:10:19,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-21 22:10:19,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2020-12-21 22:10:19,675 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 25 [2020-12-21 22:10:19,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:19,676 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2020-12-21 22:10:19,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 22:10:19,676 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2020-12-21 22:10:19,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-21 22:10:19,677 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:19,677 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:19,890 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:19,891 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:19,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:19,892 INFO L82 PathProgramCache]: Analyzing trace with hash -736833947, now seen corresponding path program 4 times [2020-12-21 22:10:19,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:19,893 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485888906] [2020-12-21 22:10:19,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:19,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:19,997 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-12-21 22:10:19,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485888906] [2020-12-21 22:10:19,998 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65154402] [2020-12-21 22:10:19,999 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:20,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:10:20,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:20,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 22:10:20,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:20,113 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-12-21 22:10:20,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:20,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 22:10:20,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736717135] [2020-12-21 22:10:20,115 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 22:10:20,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:20,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 22:10:20,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 22:10:20,117 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 8 states. [2020-12-21 22:10:20,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:20,221 INFO L93 Difference]: Finished difference Result 63 states and 80 transitions. [2020-12-21 22:10:20,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 22:10:20,222 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-12-21 22:10:20,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:20,223 INFO L225 Difference]: With dead ends: 63 [2020-12-21 22:10:20,223 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 22:10:20,224 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 22:10:20,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 22:10:20,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-12-21 22:10:20,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 22:10:20,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-12-21 22:10:20,232 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 30 [2020-12-21 22:10:20,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:20,232 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-12-21 22:10:20,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 22:10:20,232 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-12-21 22:10:20,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 22:10:20,234 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:20,234 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:20,447 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:20,448 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:20,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:20,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1407538841, now seen corresponding path program 5 times [2020-12-21 22:10:20,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:20,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907180054] [2020-12-21 22:10:20,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:20,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:20,547 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2020-12-21 22:10:20,547 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907180054] [2020-12-21 22:10:20,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108178270] [2020-12-21 22:10:20,548 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:20,810 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 22:10:20,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:20,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 22:10:20,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:20,912 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2020-12-21 22:10:20,913 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:20,913 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 22:10:20,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521532201] [2020-12-21 22:10:20,914 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 22:10:20,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:20,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 22:10:20,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 22:10:20,915 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 9 states. [2020-12-21 22:10:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:21,026 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2020-12-21 22:10:21,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 22:10:21,027 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-12-21 22:10:21,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:21,028 INFO L225 Difference]: With dead ends: 71 [2020-12-21 22:10:21,028 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 22:10:21,029 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 22:10:21,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 22:10:21,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2020-12-21 22:10:21,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-21 22:10:21,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2020-12-21 22:10:21,037 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 35 [2020-12-21 22:10:21,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:21,038 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2020-12-21 22:10:21,038 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 22:10:21,038 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2020-12-21 22:10:21,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-21 22:10:21,040 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:21,040 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:21,253 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-21 22:10:21,254 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:21,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:21,255 INFO L82 PathProgramCache]: Analyzing trace with hash 968499753, now seen corresponding path program 6 times [2020-12-21 22:10:21,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:21,257 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484275120] [2020-12-21 22:10:21,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:21,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:21,444 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2020-12-21 22:10:21,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484275120] [2020-12-21 22:10:21,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922171263] [2020-12-21 22:10:21,445 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:21,643 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 22:10:21,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:21,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 22:10:21,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 22:10:21,744 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:21,745 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 22:10:21,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177150440] [2020-12-21 22:10:21,746 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 22:10:21,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:21,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 22:10:21,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 22:10:21,748 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand 10 states. [2020-12-21 22:10:21,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:21,883 INFO L93 Difference]: Finished difference Result 79 states and 100 transitions. [2020-12-21 22:10:21,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 22:10:21,883 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2020-12-21 22:10:21,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:21,884 INFO L225 Difference]: With dead ends: 79 [2020-12-21 22:10:21,885 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 22:10:21,886 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 22:10:21,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 22:10:21,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-12-21 22:10:21,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 22:10:21,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 58 transitions. [2020-12-21 22:10:21,893 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 58 transitions. Word has length 40 [2020-12-21 22:10:21,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:21,894 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 58 transitions. [2020-12-21 22:10:21,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 22:10:21,894 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 58 transitions. [2020-12-21 22:10:21,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 22:10:21,896 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:21,896 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:22,110 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:22,111 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:22,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:22,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1016346923, now seen corresponding path program 7 times [2020-12-21 22:10:22,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:22,114 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787984523] [2020-12-21 22:10:22,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:22,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:22,304 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-12-21 22:10:22,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787984523] [2020-12-21 22:10:22,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15552636] [2020-12-21 22:10:22,306 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:22,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:22,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 22:10:22,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:22,498 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-12-21 22:10:22,499 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:22,499 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 22:10:22,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342026200] [2020-12-21 22:10:22,500 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 22:10:22,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:22,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 22:10:22,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 22:10:22,501 INFO L87 Difference]: Start difference. First operand 48 states and 58 transitions. Second operand 11 states. [2020-12-21 22:10:22,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:22,627 INFO L93 Difference]: Finished difference Result 87 states and 110 transitions. [2020-12-21 22:10:22,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 22:10:22,628 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-12-21 22:10:22,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:22,629 INFO L225 Difference]: With dead ends: 87 [2020-12-21 22:10:22,629 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 22:10:22,630 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 22:10:22,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 22:10:22,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2020-12-21 22:10:22,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-21 22:10:22,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2020-12-21 22:10:22,637 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 45 [2020-12-21 22:10:22,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:22,638 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-12-21 22:10:22,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 22:10:22,638 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2020-12-21 22:10:22,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-21 22:10:22,640 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:22,640 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:22,854 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:22,855 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:22,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:22,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1143734803, now seen corresponding path program 8 times [2020-12-21 22:10:22,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:22,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909165146] [2020-12-21 22:10:22,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:22,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:23,028 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-12-21 22:10:23,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909165146] [2020-12-21 22:10:23,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391174144] [2020-12-21 22:10:23,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:23,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:10:23,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:23,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 22:10:23,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:23,211 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-12-21 22:10:23,212 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:23,212 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 22:10:23,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148577258] [2020-12-21 22:10:23,215 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 22:10:23,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:23,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 22:10:23,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 22:10:23,217 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand 12 states. [2020-12-21 22:10:23,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:23,346 INFO L93 Difference]: Finished difference Result 95 states and 120 transitions. [2020-12-21 22:10:23,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 22:10:23,346 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2020-12-21 22:10:23,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:23,347 INFO L225 Difference]: With dead ends: 95 [2020-12-21 22:10:23,347 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 22:10:23,348 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 22:10:23,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 22:10:23,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-12-21 22:10:23,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 22:10:23,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2020-12-21 22:10:23,355 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 50 [2020-12-21 22:10:23,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:23,356 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2020-12-21 22:10:23,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 22:10:23,356 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2020-12-21 22:10:23,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 22:10:23,357 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:23,357 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:23,571 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-21 22:10:23,572 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:23,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:23,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1908772625, now seen corresponding path program 9 times [2020-12-21 22:10:23,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:23,575 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828430] [2020-12-21 22:10:23,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:23,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:23,732 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-12-21 22:10:23,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828430] [2020-12-21 22:10:23,734 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109699688] [2020-12-21 22:10:23,734 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:25,813 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-21 22:10:25,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:25,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 22:10:25,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:25,914 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-12-21 22:10:25,914 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:25,914 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 22:10:25,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257693692] [2020-12-21 22:10:25,915 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 22:10:25,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:25,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 22:10:25,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 22:10:25,917 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand 13 states. [2020-12-21 22:10:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:26,061 INFO L93 Difference]: Finished difference Result 103 states and 130 transitions. [2020-12-21 22:10:26,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 22:10:26,062 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-12-21 22:10:26,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:26,063 INFO L225 Difference]: With dead ends: 103 [2020-12-21 22:10:26,064 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 22:10:26,068 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 22:10:26,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 22:10:26,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2020-12-21 22:10:26,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-12-21 22:10:26,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2020-12-21 22:10:26,078 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 55 [2020-12-21 22:10:26,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:26,079 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2020-12-21 22:10:26,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 22:10:26,079 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2020-12-21 22:10:26,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-21 22:10:26,080 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:26,080 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:26,287 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:26,288 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:26,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:26,289 INFO L82 PathProgramCache]: Analyzing trace with hash -967663183, now seen corresponding path program 10 times [2020-12-21 22:10:26,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:26,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045752314] [2020-12-21 22:10:26,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:26,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:26,507 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-12-21 22:10:26,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045752314] [2020-12-21 22:10:26,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980344750] [2020-12-21 22:10:26,508 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:26,671 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:10:26,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:10:26,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 22:10:26,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:10:26,778 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-12-21 22:10:26,779 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:10:26,779 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 22:10:26,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533201891] [2020-12-21 22:10:26,780 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 22:10:26,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:10:26,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 22:10:26,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 22:10:26,781 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand 14 states. [2020-12-21 22:10:26,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:10:26,937 INFO L93 Difference]: Finished difference Result 111 states and 140 transitions. [2020-12-21 22:10:26,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 22:10:26,938 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 60 [2020-12-21 22:10:26,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:10:26,940 INFO L225 Difference]: With dead ends: 111 [2020-12-21 22:10:26,940 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 22:10:26,941 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 22:10:26,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 22:10:26,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-12-21 22:10:26,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 22:10:26,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2020-12-21 22:10:26,948 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 60 [2020-12-21 22:10:26,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:10:26,949 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2020-12-21 22:10:26,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 22:10:26,949 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2020-12-21 22:10:26,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 22:10:26,950 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:10:26,950 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:10:27,163 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:10:27,164 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:10:27,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:10:27,166 INFO L82 PathProgramCache]: Analyzing trace with hash -2055049395, now seen corresponding path program 11 times [2020-12-21 22:10:27,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:10:27,166 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478754490] [2020-12-21 22:10:27,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:10:27,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:10:27,344 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-12-21 22:10:27,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478754490] [2020-12-21 22:10:27,345 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026429311] [2020-12-21 22:10:27,345 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:00,861 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 22:11:00,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:00,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 22:11:00,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:00,987 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-12-21 22:11:00,987 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:00,987 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 22:11:00,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282229853] [2020-12-21 22:11:00,988 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 22:11:00,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:00,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 22:11:00,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 22:11:00,989 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand 15 states. [2020-12-21 22:11:01,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:01,170 INFO L93 Difference]: Finished difference Result 119 states and 150 transitions. [2020-12-21 22:11:01,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 22:11:01,171 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 65 [2020-12-21 22:11:01,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:01,172 INFO L225 Difference]: With dead ends: 119 [2020-12-21 22:11:01,172 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 22:11:01,173 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 22:11:01,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 22:11:01,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2020-12-21 22:11:01,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-21 22:11:01,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2020-12-21 22:11:01,180 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 65 [2020-12-21 22:11:01,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:01,180 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2020-12-21 22:11:01,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 22:11:01,180 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2020-12-21 22:11:01,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-21 22:11:01,181 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:01,182 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:01,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 22:11:01,396 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:01,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:01,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1898335605, now seen corresponding path program 12 times [2020-12-21 22:11:01,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:01,398 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610864387] [2020-12-21 22:11:01,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:01,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:01,644 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 22:11:01,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610864387] [2020-12-21 22:11:01,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755404479] [2020-12-21 22:11:01,645 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:13,416 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 22:11:13,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:13,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 22:11:13,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:13,553 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 22:11:13,554 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:13,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 22:11:13,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364379439] [2020-12-21 22:11:13,555 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 22:11:13,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:13,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 22:11:13,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 22:11:13,556 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand 16 states. [2020-12-21 22:11:13,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:13,729 INFO L93 Difference]: Finished difference Result 127 states and 160 transitions. [2020-12-21 22:11:13,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 22:11:13,730 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 70 [2020-12-21 22:11:13,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:13,731 INFO L225 Difference]: With dead ends: 127 [2020-12-21 22:11:13,731 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 22:11:13,732 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 22:11:13,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 22:11:13,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-12-21 22:11:13,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-12-21 22:11:13,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 94 transitions. [2020-12-21 22:11:13,738 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 94 transitions. Word has length 70 [2020-12-21 22:11:13,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:13,738 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 94 transitions. [2020-12-21 22:11:13,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 22:11:13,738 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 94 transitions. [2020-12-21 22:11:13,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-12-21 22:11:13,739 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:13,740 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:13,954 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 22:11:13,955 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:13,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:13,956 INFO L82 PathProgramCache]: Analyzing trace with hash -684578935, now seen corresponding path program 13 times [2020-12-21 22:11:13,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:13,957 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251418855] [2020-12-21 22:11:13,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:13,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:14,201 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2020-12-21 22:11:14,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251418855] [2020-12-21 22:11:14,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177622483] [2020-12-21 22:11:14,202 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:14,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:14,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 22:11:14,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2020-12-21 22:11:14,412 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:14,412 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 22:11:14,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874322620] [2020-12-21 22:11:14,413 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 22:11:14,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:14,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 22:11:14,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 22:11:14,415 INFO L87 Difference]: Start difference. First operand 78 states and 94 transitions. Second operand 17 states. [2020-12-21 22:11:14,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:14,608 INFO L93 Difference]: Finished difference Result 135 states and 170 transitions. [2020-12-21 22:11:14,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 22:11:14,609 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 75 [2020-12-21 22:11:14,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:14,613 INFO L225 Difference]: With dead ends: 135 [2020-12-21 22:11:14,613 INFO L226 Difference]: Without dead ends: 86 [2020-12-21 22:11:14,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 22:11:14,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-21 22:11:14,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2020-12-21 22:11:14,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-12-21 22:11:14,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 100 transitions. [2020-12-21 22:11:14,630 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 100 transitions. Word has length 75 [2020-12-21 22:11:14,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:14,630 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 100 transitions. [2020-12-21 22:11:14,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 22:11:14,630 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 100 transitions. [2020-12-21 22:11:14,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-21 22:11:14,641 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:14,642 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:14,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-21 22:11:14,857 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:14,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:14,858 INFO L82 PathProgramCache]: Analyzing trace with hash -1002487495, now seen corresponding path program 14 times [2020-12-21 22:11:14,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:14,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149570728] [2020-12-21 22:11:14,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:14,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:15,152 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2020-12-21 22:11:15,153 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149570728] [2020-12-21 22:11:15,153 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221498288] [2020-12-21 22:11:15,153 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:15,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:11:15,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:15,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 22:11:15,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:15,381 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2020-12-21 22:11:15,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:15,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 22:11:15,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980562389] [2020-12-21 22:11:15,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 22:11:15,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:15,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 22:11:15,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 22:11:15,384 INFO L87 Difference]: Start difference. First operand 83 states and 100 transitions. Second operand 18 states. [2020-12-21 22:11:15,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:15,584 INFO L93 Difference]: Finished difference Result 143 states and 180 transitions. [2020-12-21 22:11:15,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 22:11:15,584 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 80 [2020-12-21 22:11:15,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:15,586 INFO L225 Difference]: With dead ends: 143 [2020-12-21 22:11:15,586 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 22:11:15,587 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 [2020-12-21 22:11:15,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 22:11:15,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-12-21 22:11:15,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-12-21 22:11:15,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 106 transitions. [2020-12-21 22:11:15,592 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 106 transitions. Word has length 80 [2020-12-21 22:11:15,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:15,592 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 106 transitions. [2020-12-21 22:11:15,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 22:11:15,593 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 106 transitions. [2020-12-21 22:11:15,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-12-21 22:11:15,594 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:15,594 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:15,808 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:15,809 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:15,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:15,810 INFO L82 PathProgramCache]: Analyzing trace with hash -1385924667, now seen corresponding path program 15 times [2020-12-21 22:11:15,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:15,811 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132564406] [2020-12-21 22:11:15,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:15,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2020-12-21 22:11:16,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132564406] [2020-12-21 22:11:16,090 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12524128] [2020-12-21 22:11:16,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:34,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-21 22:11:34,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:34,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 22:11:34,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:34,897 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-21 22:11:34,897 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:34,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 22:11:34,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263791339] [2020-12-21 22:11:34,899 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 22:11:34,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:34,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 22:11:34,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 22:11:34,908 INFO L87 Difference]: Start difference. First operand 88 states and 106 transitions. Second operand 19 states. [2020-12-21 22:11:35,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:35,113 INFO L93 Difference]: Finished difference Result 151 states and 190 transitions. [2020-12-21 22:11:35,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 22:11:35,113 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 85 [2020-12-21 22:11:35,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:35,115 INFO L225 Difference]: With dead ends: 151 [2020-12-21 22:11:35,115 INFO L226 Difference]: Without dead ends: 96 [2020-12-21 22:11:35,116 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 22:11:35,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-21 22:11:35,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2020-12-21 22:11:35,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-12-21 22:11:35,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 112 transitions. [2020-12-21 22:11:35,121 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 112 transitions. Word has length 85 [2020-12-21 22:11:35,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:35,122 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 112 transitions. [2020-12-21 22:11:35,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 22:11:35,122 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 112 transitions. [2020-12-21 22:11:35,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-12-21 22:11:35,123 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:35,124 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:35,338 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 22:11:35,339 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:35,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:35,340 INFO L82 PathProgramCache]: Analyzing trace with hash -74597123, now seen corresponding path program 16 times [2020-12-21 22:11:35,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:35,341 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409583680] [2020-12-21 22:11:35,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:35,614 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2020-12-21 22:11:35,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409583680] [2020-12-21 22:11:35,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874236923] [2020-12-21 22:11:35,615 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:11:35,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 22:11:35,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:11:35,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 22:11:35,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:11:35,988 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2020-12-21 22:11:35,989 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:11:35,989 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 22:11:35,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134447928] [2020-12-21 22:11:35,990 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 22:11:35,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:11:35,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 22:11:35,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 22:11:35,992 INFO L87 Difference]: Start difference. First operand 93 states and 112 transitions. Second operand 20 states. [2020-12-21 22:11:36,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:11:36,214 INFO L93 Difference]: Finished difference Result 159 states and 200 transitions. [2020-12-21 22:11:36,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 22:11:36,215 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 90 [2020-12-21 22:11:36,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:11:36,216 INFO L225 Difference]: With dead ends: 159 [2020-12-21 22:11:36,216 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 22:11:36,217 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 22:11:36,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 22:11:36,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 98. [2020-12-21 22:11:36,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-12-21 22:11:36,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 118 transitions. [2020-12-21 22:11:36,222 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 118 transitions. Word has length 90 [2020-12-21 22:11:36,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:11:36,222 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 118 transitions. [2020-12-21 22:11:36,222 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 22:11:36,222 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 118 transitions. [2020-12-21 22:11:36,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-12-21 22:11:36,223 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:11:36,223 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:11:36,423 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 22:11:36,424 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:11:36,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:11:36,425 INFO L82 PathProgramCache]: Analyzing trace with hash 2024349697, now seen corresponding path program 17 times [2020-12-21 22:11:36,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:11:36,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069358623] [2020-12-21 22:11:36,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:11:36,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:11:36,731 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-21 22:11:36,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069358623] [2020-12-21 22:11:36,732 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969027742] [2020-12-21 22:11:36,732 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 22:13:14,427 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-21 22:13:14,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:13:14,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 22:13:14,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:13:14,605 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-21 22:13:14,605 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:13:14,605 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 22:13:14,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736031661] [2020-12-21 22:13:14,606 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 22:13:14,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:13:14,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 22:13:14,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 22:13:14,607 INFO L87 Difference]: Start difference. First operand 98 states and 118 transitions. Second operand 21 states. [2020-12-21 22:13:14,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:13:14,827 INFO L93 Difference]: Finished difference Result 167 states and 210 transitions. [2020-12-21 22:13:14,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 22:13:14,831 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 95 [2020-12-21 22:13:14,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:13:14,833 INFO L225 Difference]: With dead ends: 167 [2020-12-21 22:13:14,833 INFO L226 Difference]: Without dead ends: 106 [2020-12-21 22:13:14,833 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 22:13:14,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-12-21 22:13:14,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2020-12-21 22:13:14,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-12-21 22:13:14,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 124 transitions. [2020-12-21 22:13:14,838 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 124 transitions. Word has length 95 [2020-12-21 22:13:14,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:13:14,838 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 124 transitions. [2020-12-21 22:13:14,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 22:13:14,838 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 124 transitions. [2020-12-21 22:13:14,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-12-21 22:13:14,839 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:13:14,840 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:13:15,054 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:13:15,055 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:13:15,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:13:15,056 INFO L82 PathProgramCache]: Analyzing trace with hash -889061183, now seen corresponding path program 18 times [2020-12-21 22:13:15,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:13:15,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242811146] [2020-12-21 22:13:15,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:13:15,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:13:15,354 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2020-12-21 22:13:15,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242811146] [2020-12-21 22:13:15,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689538338] [2020-12-21 22:13:15,355 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 22:14:32,562 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-21 22:14:32,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:14:32,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 22:14:32,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:14:32,773 INFO L134 CoverageAnalysis]: Checked inductivity of 801 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-21 22:14:32,774 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:14:32,774 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-21 22:14:32,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122091253] [2020-12-21 22:14:32,775 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 22:14:32,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:14:32,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 22:14:32,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 22:14:32,776 INFO L87 Difference]: Start difference. First operand 103 states and 124 transitions. Second operand 22 states. [2020-12-21 22:14:32,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:14:32,984 INFO L93 Difference]: Finished difference Result 175 states and 220 transitions. [2020-12-21 22:14:32,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 22:14:32,985 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 100 [2020-12-21 22:14:32,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:14:32,985 INFO L225 Difference]: With dead ends: 175 [2020-12-21 22:14:32,985 INFO L226 Difference]: Without dead ends: 111 [2020-12-21 22:14:32,986 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 22:14:32,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-12-21 22:14:32,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 108. [2020-12-21 22:14:32,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-12-21 22:14:32,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 130 transitions. [2020-12-21 22:14:32,990 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 130 transitions. Word has length 100 [2020-12-21 22:14:32,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:14:32,991 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 130 transitions. [2020-12-21 22:14:32,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 22:14:32,991 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 130 transitions. [2020-12-21 22:14:32,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-12-21 22:14:32,992 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:14:32,992 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:14:33,193 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:14:33,193 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:14:33,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:14:33,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1886396355, now seen corresponding path program 19 times [2020-12-21 22:14:33,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:14:33,195 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243486807] [2020-12-21 22:14:33,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:14:33,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:14:33,520 INFO L134 CoverageAnalysis]: Checked inductivity of 893 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2020-12-21 22:14:33,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243486807] [2020-12-21 22:14:33,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921699454] [2020-12-21 22:14:33,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:14:33,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:14:33,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 22:14:33,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:14:33,737 INFO L134 CoverageAnalysis]: Checked inductivity of 893 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2020-12-21 22:14:33,737 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:14:33,738 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 22:14:33,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024659662] [2020-12-21 22:14:33,738 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 22:14:33,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:14:33,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 22:14:33,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 22:14:33,740 INFO L87 Difference]: Start difference. First operand 108 states and 130 transitions. Second operand 23 states. [2020-12-21 22:14:33,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:14:33,968 INFO L93 Difference]: Finished difference Result 183 states and 230 transitions. [2020-12-21 22:14:33,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 22:14:33,969 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 105 [2020-12-21 22:14:33,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:14:33,970 INFO L225 Difference]: With dead ends: 183 [2020-12-21 22:14:33,970 INFO L226 Difference]: Without dead ends: 116 [2020-12-21 22:14:33,971 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 22:14:33,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-12-21 22:14:33,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2020-12-21 22:14:33,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-12-21 22:14:33,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 136 transitions. [2020-12-21 22:14:33,975 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 136 transitions. Word has length 105 [2020-12-21 22:14:33,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:14:33,975 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 136 transitions. [2020-12-21 22:14:33,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 22:14:33,975 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 136 transitions. [2020-12-21 22:14:33,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-12-21 22:14:33,977 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:14:33,977 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:14:34,190 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:14:34,191 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:14:34,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:14:34,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1567863675, now seen corresponding path program 20 times [2020-12-21 22:14:34,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:14:34,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035541109] [2020-12-21 22:14:34,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:14:34,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:14:34,532 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2020-12-21 22:14:34,533 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035541109] [2020-12-21 22:14:34,533 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70642428] [2020-12-21 22:14:34,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 22:14:34,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 22:14:34,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 22:14:34,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 22:14:34,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 22:14:34,785 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2020-12-21 22:14:34,786 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 22:14:34,786 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 22:14:34,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478080409] [2020-12-21 22:14:34,787 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 22:14:34,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 22:14:34,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 22:14:34,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 22:14:34,788 INFO L87 Difference]: Start difference. First operand 113 states and 136 transitions. Second operand 24 states. [2020-12-21 22:14:35,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 22:14:35,035 INFO L93 Difference]: Finished difference Result 191 states and 240 transitions. [2020-12-21 22:14:35,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 22:14:35,036 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 110 [2020-12-21 22:14:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 22:14:35,037 INFO L225 Difference]: With dead ends: 191 [2020-12-21 22:14:35,037 INFO L226 Difference]: Without dead ends: 121 [2020-12-21 22:14:35,037 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 22:14:35,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-12-21 22:14:35,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 118. [2020-12-21 22:14:35,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-12-21 22:14:35,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 142 transitions. [2020-12-21 22:14:35,042 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 142 transitions. Word has length 110 [2020-12-21 22:14:35,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 22:14:35,043 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 142 transitions. [2020-12-21 22:14:35,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 22:14:35,043 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 142 transitions. [2020-12-21 22:14:35,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-12-21 22:14:35,044 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 22:14:35,045 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 22:14:35,258 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 22:14:35,259 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 22:14:35,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 22:14:35,260 INFO L82 PathProgramCache]: Analyzing trace with hash -358057863, now seen corresponding path program 21 times [2020-12-21 22:14:35,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 22:14:35,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434805063] [2020-12-21 22:14:35,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 22:14:35,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 22:14:35,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1092 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 651 trivial. 0 not checked. [2020-12-21 22:14:35,619 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434805063] [2020-12-21 22:14:35,619 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594406448] [2020-12-21 22:14:35,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true