/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_copyInitSum2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:29:06,894 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:29:06,896 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:29:06,936 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:29:06,936 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:29:06,938 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:29:06,940 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:29:06,942 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:29:06,945 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:29:06,947 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:29:06,949 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:29:06,951 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 21:29:06,951 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 21:29:06,953 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 21:29:06,954 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 21:29:06,956 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 21:29:06,957 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 21:29:06,972 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 21:29:06,980 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 21:29:06,986 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 21:29:06,992 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 21:29:06,994 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 21:29:06,996 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 21:29:07,003 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 21:29:07,013 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 21:29:07,021 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-21 21:29:07,023 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-21 21:29:07,024 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-21 21:29:07,025 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-21 21:29:07,029 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-21 21:29:07,030 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-21 21:29:07,031 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-21 21:29:07,031 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-21 21:29:07,032 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:29:07,033 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:29:07,034 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:29:07,035 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:29:07,098 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:29:07,099 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:29:07,100 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:29:07,100 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:29:07,101 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:29:07,101 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:29:07,101 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:29:07,101 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:29:07,102 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:29:07,102 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:29:07,102 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:29:07,102 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:29:07,103 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:29:07,103 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:29:07,103 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:29:07,103 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:29:07,104 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:29:07,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:29:07,104 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:29:07,104 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:29:07,104 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:29:07,105 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:29:07,105 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:29:07,105 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:29:07,105 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:29:07,105 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:29:07,533 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:29:07,569 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:29:07,574 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:29:07,575 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:29:07,576 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:29:07,577 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copyInitSum2_ground-2.i [2020-12-21 21:29:07,673 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/091900765/0548b94a0c954473b7d66c54f2a32839/FLAG0068ea644 [2020-12-21 21:29:08,371 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:29:08,372 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copyInitSum2_ground-2.i [2020-12-21 21:29:08,380 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/091900765/0548b94a0c954473b7d66c54f2a32839/FLAG0068ea644 [2020-12-21 21:29:08,737 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/091900765/0548b94a0c954473b7d66c54f2a32839 [2020-12-21 21:29:08,742 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:29:08,744 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:29:08,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:08,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:29:08,753 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:29:08,754 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:08" (1/1) ... [2020-12-21 21:29:08,757 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@505c1250 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:08, skipping insertion in model container [2020-12-21 21:29:08,757 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:08" (1/1) ... [2020-12-21 21:29:08,767 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:29:08,784 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:29:08,985 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-examples/standard_copyInitSum2_ground-2.i[823,836] [2020-12-21 21:29:09,004 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:09,015 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:29:09,031 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-examples/standard_copyInitSum2_ground-2.i[823,836] [2020-12-21 21:29:09,040 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:09,059 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:29:09,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09 WrapperNode [2020-12-21 21:29:09,059 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:09,061 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:09,061 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:29:09,061 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:29:09,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,081 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,106 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:09,107 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:29:09,108 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:29:09,108 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:29:09,119 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,119 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,121 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,128 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,133 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,135 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (1/1) ... [2020-12-21 21:29:09,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:29:09,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:29:09,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:29:09,139 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:29:09,140 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (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 21:29:09,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:29:09,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:29:09,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:29:09,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:29:09,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:29:09,261 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:29:09,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:29:09,643 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:29:09,643 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-21 21:29:09,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:09 BoogieIcfgContainer [2020-12-21 21:29:09,658 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:29:09,661 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:29:09,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:29:09,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:29:09,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:29:08" (1/3) ... [2020-12-21 21:29:09,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27d2211a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:09, skipping insertion in model container [2020-12-21 21:29:09,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:09" (2/3) ... [2020-12-21 21:29:09,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27d2211a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:09, skipping insertion in model container [2020-12-21 21:29:09,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:09" (3/3) ... [2020-12-21 21:29:09,679 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copyInitSum2_ground-2.i [2020-12-21 21:29:09,695 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:29:09,701 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:29:09,729 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:29:09,765 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:29:09,766 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:29:09,766 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:29:09,766 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:29:09,766 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:29:09,766 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:29:09,767 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:29:09,767 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:29:09,788 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-21 21:29:09,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:29:09,795 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:09,796 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:09,796 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:09,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:09,804 INFO L82 PathProgramCache]: Analyzing trace with hash -952172836, now seen corresponding path program 1 times [2020-12-21 21:29:09,815 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:09,816 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130085652] [2020-12-21 21:29:09,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:09,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:10,020 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 21:29:10,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130085652] [2020-12-21 21:29:10,022 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:29:10,022 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:29:10,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604699312] [2020-12-21 21:29:10,029 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:29:10,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:10,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:29:10,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:10,050 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2020-12-21 21:29:10,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:10,137 INFO L93 Difference]: Finished difference Result 42 states and 62 transitions. [2020-12-21 21:29:10,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:29:10,139 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-21 21:29:10,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:10,150 INFO L225 Difference]: With dead ends: 42 [2020-12-21 21:29:10,150 INFO L226 Difference]: Without dead ends: 21 [2020-12-21 21:29:10,153 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 21:29:10,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-21 21:29:10,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2020-12-21 21:29:10,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-21 21:29:10,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-12-21 21:29:10,199 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2020-12-21 21:29:10,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:10,200 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-12-21 21:29:10,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:29:10,200 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-12-21 21:29:10,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-21 21:29:10,201 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:10,201 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:10,202 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:29:10,202 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:10,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:10,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1567052653, now seen corresponding path program 1 times [2020-12-21 21:29:10,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:10,204 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260291372] [2020-12-21 21:29:10,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:10,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:29:10,270 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260291372] [2020-12-21 21:29:10,270 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85209420] [2020-12-21 21:29:10,270 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 21:29:10,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:10,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:29:10,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:10,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-21 21:29:10,489 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:10,490 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:29:10,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759026467] [2020-12-21 21:29:10,492 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:29:10,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:10,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:29:10,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:10,494 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 5 states. [2020-12-21 21:29:10,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:10,590 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-12-21 21:29:10,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:29:10,592 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-12-21 21:29:10,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:10,593 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:29:10,593 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 21:29:10,595 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 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 21:29:10,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 21:29:10,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-12-21 21:29:10,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:29:10,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2020-12-21 21:29:10,602 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 16 [2020-12-21 21:29:10,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:10,602 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2020-12-21 21:29:10,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:29:10,603 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2020-12-21 21:29:10,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:29:10,604 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:10,604 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:10,817 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:29:10,818 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:10,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:10,821 INFO L82 PathProgramCache]: Analyzing trace with hash 159288628, now seen corresponding path program 2 times [2020-12-21 21:29:10,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:10,822 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631692173] [2020-12-21 21:29:10,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:10,910 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:29:10,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631692173] [2020-12-21 21:29:10,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754280163] [2020-12-21 21:29:10,912 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 21:29:10,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:10,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:10,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:29:10,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:11,020 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-12-21 21:29:11,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:11,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:29:11,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422855034] [2020-12-21 21:29:11,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:29:11,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:11,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:29:11,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:11,024 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 6 states. [2020-12-21 21:29:11,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:11,089 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-12-21 21:29:11,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:29:11,090 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-12-21 21:29:11,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:11,091 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:29:11,092 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:29:11,092 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:11,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:29:11,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-21 21:29:11,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-21 21:29:11,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-12-21 21:29:11,100 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-12-21 21:29:11,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:11,100 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-12-21 21:29:11,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:29:11,101 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-12-21 21:29:11,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-21 21:29:11,102 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:11,102 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:11,316 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:11,317 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:11,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:11,319 INFO L82 PathProgramCache]: Analyzing trace with hash 2098372907, now seen corresponding path program 3 times [2020-12-21 21:29:11,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:11,320 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078952047] [2020-12-21 21:29:11,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:11,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:11,394 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:29:11,395 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078952047] [2020-12-21 21:29:11,395 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577787559] [2020-12-21 21:29:11,395 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 21:29:11,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:29:11,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:11,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:29:11,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:11,536 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-21 21:29:11,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:11,537 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:29:11,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532210725] [2020-12-21 21:29:11,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:29:11,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:11,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:29:11,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:11,539 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 7 states. [2020-12-21 21:29:11,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:11,605 INFO L93 Difference]: Finished difference Result 59 states and 67 transitions. [2020-12-21 21:29:11,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:29:11,606 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-12-21 21:29:11,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:11,607 INFO L225 Difference]: With dead ends: 59 [2020-12-21 21:29:11,607 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:29:11,608 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 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 21:29:11,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:29:11,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-12-21 21:29:11,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:29:11,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2020-12-21 21:29:11,615 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2020-12-21 21:29:11,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:11,615 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2020-12-21 21:29:11,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:29:11,615 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2020-12-21 21:29:11,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:29:11,616 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:11,616 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:11,829 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:11,830 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:11,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:11,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1609282676, now seen corresponding path program 4 times [2020-12-21 21:29:11,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:11,833 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933731710] [2020-12-21 21:29:11,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:11,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-21 21:29:11,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933731710] [2020-12-21 21:29:11,973 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724743746] [2020-12-21 21:29:11,973 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 21:29:12,049 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:12,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:12,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:29:12,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:12,135 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-12-21 21:29:12,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:12,142 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:29:12,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909599845] [2020-12-21 21:29:12,142 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:29:12,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:12,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:29:12,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:12,144 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 8 states. [2020-12-21 21:29:12,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:12,256 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2020-12-21 21:29:12,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:29:12,257 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-12-21 21:29:12,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:12,262 INFO L225 Difference]: With dead ends: 68 [2020-12-21 21:29:12,262 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:29:12,264 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 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 21:29:12,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:29:12,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-12-21 21:29:12,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-21 21:29:12,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2020-12-21 21:29:12,281 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 31 [2020-12-21 21:29:12,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:12,283 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2020-12-21 21:29:12,284 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:29:12,284 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2020-12-21 21:29:12,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-21 21:29:12,285 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:12,285 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:12,486 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:12,486 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:12,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:12,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1784739267, now seen corresponding path program 5 times [2020-12-21 21:29:12,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:12,488 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219583747] [2020-12-21 21:29:12,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:12,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:12,586 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-12-21 21:29:12,587 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219583747] [2020-12-21 21:29:12,587 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199271291] [2020-12-21 21:29:12,587 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 21:29:13,063 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-21 21:29:13,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:13,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:29:13,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:13,132 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-12-21 21:29:13,132 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:13,133 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:29:13,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751583581] [2020-12-21 21:29:13,133 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:29:13,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:13,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:29:13,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:13,135 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2020-12-21 21:29:13,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:13,224 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2020-12-21 21:29:13,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:29:13,225 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-12-21 21:29:13,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:13,226 INFO L225 Difference]: With dead ends: 77 [2020-12-21 21:29:13,226 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:29:13,227 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 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 21:29:13,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:29:13,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-12-21 21:29:13,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:29:13,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2020-12-21 21:29:13,233 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 36 [2020-12-21 21:29:13,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:13,234 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2020-12-21 21:29:13,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:29:13,234 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2020-12-21 21:29:13,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:29:13,235 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:13,235 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:13,443 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:29:13,444 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:13,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:13,445 INFO L82 PathProgramCache]: Analyzing trace with hash 2008431076, now seen corresponding path program 6 times [2020-12-21 21:29:13,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:13,446 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837038641] [2020-12-21 21:29:13,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:13,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:13,593 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-12-21 21:29:13,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837038641] [2020-12-21 21:29:13,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4445215] [2020-12-21 21:29:13,594 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 21:29:13,840 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:29:13,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:13,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:29:13,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:13,937 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-12-21 21:29:13,938 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:13,938 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 12 [2020-12-21 21:29:13,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142658682] [2020-12-21 21:29:13,939 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:29:13,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:13,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:29:13,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:13,940 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 12 states. [2020-12-21 21:29:14,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:14,064 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2020-12-21 21:29:14,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:29:14,065 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-12-21 21:29:14,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:14,065 INFO L225 Difference]: With dead ends: 86 [2020-12-21 21:29:14,066 INFO L226 Difference]: Without dead ends: 51 [2020-12-21 21:29:14,066 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:14,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-21 21:29:14,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-12-21 21:29:14,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-21 21:29:14,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-12-21 21:29:14,073 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 41 [2020-12-21 21:29:14,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:14,074 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-12-21 21:29:14,074 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:29:14,074 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-12-21 21:29:14,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-21 21:29:14,075 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:14,075 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:14,287 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:14,288 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:14,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:14,289 INFO L82 PathProgramCache]: Analyzing trace with hash -700601765, now seen corresponding path program 7 times [2020-12-21 21:29:14,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:14,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148071023] [2020-12-21 21:29:14,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:14,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2020-12-21 21:29:14,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148071023] [2020-12-21 21:29:14,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842439382] [2020-12-21 21:29:14,413 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 21:29:14,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:14,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:29:14,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:14,568 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2020-12-21 21:29:14,569 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:14,569 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:29:14,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266917960] [2020-12-21 21:29:14,570 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:29:14,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:14,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:29:14,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:14,571 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 11 states. [2020-12-21 21:29:14,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:14,679 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2020-12-21 21:29:14,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:29:14,680 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 46 [2020-12-21 21:29:14,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:14,681 INFO L225 Difference]: With dead ends: 95 [2020-12-21 21:29:14,681 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:29:14,682 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 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 21:29:14,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:29:14,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 54. [2020-12-21 21:29:14,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:29:14,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2020-12-21 21:29:14,688 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 46 [2020-12-21 21:29:14,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:14,688 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2020-12-21 21:29:14,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:29:14,689 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2020-12-21 21:29:14,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:29:14,690 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:14,690 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:14,905 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:14,906 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:14,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:14,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1469732924, now seen corresponding path program 8 times [2020-12-21 21:29:14,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:14,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495724994] [2020-12-21 21:29:14,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:14,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:15,082 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:29:15,083 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495724994] [2020-12-21 21:29:15,083 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800326062] [2020-12-21 21:29:15,083 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 21:29:15,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:15,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:15,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:29:15,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:15,257 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-12-21 21:29:15,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:15,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:29:15,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923414758] [2020-12-21 21:29:15,261 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:29:15,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:15,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:29:15,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:15,262 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 12 states. [2020-12-21 21:29:15,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:15,392 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2020-12-21 21:29:15,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:29:15,393 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 51 [2020-12-21 21:29:15,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:15,394 INFO L225 Difference]: With dead ends: 104 [2020-12-21 21:29:15,395 INFO L226 Difference]: Without dead ends: 61 [2020-12-21 21:29:15,396 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 51 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 21:29:15,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-12-21 21:29:15,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2020-12-21 21:29:15,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-21 21:29:15,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-12-21 21:29:15,409 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 51 [2020-12-21 21:29:15,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:15,409 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-12-21 21:29:15,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:29:15,410 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-12-21 21:29:15,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-21 21:29:15,412 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:15,412 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:15,626 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:29:15,627 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:15,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:15,628 INFO L82 PathProgramCache]: Analyzing trace with hash 300072691, now seen corresponding path program 9 times [2020-12-21 21:29:15,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:15,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388786898] [2020-12-21 21:29:15,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:15,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:15,808 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2020-12-21 21:29:15,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388786898] [2020-12-21 21:29:15,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002449909] [2020-12-21 21:29:15,809 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 21:29:16,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:29:16,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:16,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:29:16,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2020-12-21 21:29:16,286 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:16,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:29:16,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865759505] [2020-12-21 21:29:16,287 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:29:16,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:16,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:29:16,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:16,288 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 13 states. [2020-12-21 21:29:16,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:16,468 INFO L93 Difference]: Finished difference Result 113 states and 121 transitions. [2020-12-21 21:29:16,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:29:16,468 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2020-12-21 21:29:16,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:16,469 INFO L225 Difference]: With dead ends: 113 [2020-12-21 21:29:16,470 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 21:29:16,474 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 56 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 21:29:16,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 21:29:16,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-12-21 21:29:16,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:29:16,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2020-12-21 21:29:16,497 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 56 [2020-12-21 21:29:16,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:16,499 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2020-12-21 21:29:16,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:29:16,500 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2020-12-21 21:29:16,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:29:16,501 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:16,501 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:16,712 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:16,713 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:16,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:16,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1049188716, now seen corresponding path program 10 times [2020-12-21 21:29:16,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:16,715 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854401546] [2020-12-21 21:29:16,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:16,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:16,866 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2020-12-21 21:29:16,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854401546] [2020-12-21 21:29:16,867 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593375440] [2020-12-21 21:29:16,867 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 21:29:16,954 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:16,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:16,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:29:16,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:17,052 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-12-21 21:29:17,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:17,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:29:17,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483205107] [2020-12-21 21:29:17,054 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:29:17,054 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:17,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:29:17,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:17,055 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 14 states. [2020-12-21 21:29:17,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:17,193 INFO L93 Difference]: Finished difference Result 122 states and 130 transitions. [2020-12-21 21:29:17,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:29:17,194 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 61 [2020-12-21 21:29:17,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:17,195 INFO L225 Difference]: With dead ends: 122 [2020-12-21 21:29:17,195 INFO L226 Difference]: Without dead ends: 71 [2020-12-21 21:29:17,196 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 61 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 21:29:17,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-21 21:29:17,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2020-12-21 21:29:17,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-21 21:29:17,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-12-21 21:29:17,202 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 61 [2020-12-21 21:29:17,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:17,203 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-12-21 21:29:17,203 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:29:17,203 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-12-21 21:29:17,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-21 21:29:17,204 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:17,204 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:17,417 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:17,418 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:17,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:17,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1946825611, now seen corresponding path program 11 times [2020-12-21 21:29:17,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:17,420 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818921909] [2020-12-21 21:29:17,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:17,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:17,601 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2020-12-21 21:29:17,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818921909] [2020-12-21 21:29:17,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914460437] [2020-12-21 21:29:17,602 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 21:29:31,373 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-21 21:29:31,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:31,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:29:31,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:31,539 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-12-21 21:29:31,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:31,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:29:31,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124166568] [2020-12-21 21:29:31,540 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:29:31,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:31,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:29:31,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:29:31,542 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 15 states. [2020-12-21 21:29:31,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:31,674 INFO L93 Difference]: Finished difference Result 131 states and 139 transitions. [2020-12-21 21:29:31,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:29:31,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 66 [2020-12-21 21:29:31,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:31,676 INFO L225 Difference]: With dead ends: 131 [2020-12-21 21:29:31,676 INFO L226 Difference]: Without dead ends: 76 [2020-12-21 21:29:31,677 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 66 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 21:29:31,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-21 21:29:31,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2020-12-21 21:29:31,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-12-21 21:29:31,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2020-12-21 21:29:31,683 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 66 [2020-12-21 21:29:31,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:31,683 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2020-12-21 21:29:31,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:29:31,684 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2020-12-21 21:29:31,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-12-21 21:29:31,685 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:31,685 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:31,899 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:29:31,900 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:31,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:31,901 INFO L82 PathProgramCache]: Analyzing trace with hash -780065556, now seen corresponding path program 12 times [2020-12-21 21:29:31,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:31,901 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676642203] [2020-12-21 21:29:31,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:31,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:32,121 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-12-21 21:29:32,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676642203] [2020-12-21 21:29:32,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876047818] [2020-12-21 21:29:32,122 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 21:29:42,346 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:29:42,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:42,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-21 21:29:42,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:42,478 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-12-21 21:29:42,479 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:42,479 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:29:42,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44620136] [2020-12-21 21:29:42,481 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:29:42,481 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:42,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:29:42,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:29:42,482 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 16 states. [2020-12-21 21:29:42,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:42,627 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2020-12-21 21:29:42,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:29:42,627 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 71 [2020-12-21 21:29:42,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:42,628 INFO L225 Difference]: With dead ends: 140 [2020-12-21 21:29:42,628 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 21:29:42,629 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 71 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 21:29:42,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 21:29:42,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-12-21 21:29:42,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-21 21:29:42,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-12-21 21:29:42,637 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 71 [2020-12-21 21:29:42,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:42,637 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-12-21 21:29:42,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:29:42,637 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-12-21 21:29:42,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-21 21:29:42,638 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:42,639 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:42,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:29:42,840 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:42,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:42,841 INFO L82 PathProgramCache]: Analyzing trace with hash 2028865571, now seen corresponding path program 13 times [2020-12-21 21:29:42,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:42,842 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539272191] [2020-12-21 21:29:42,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:42,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2020-12-21 21:29:43,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539272191] [2020-12-21 21:29:43,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387129780] [2020-12-21 21:29:43,075 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 21:29:43,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:43,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:29:43,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:43,245 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2020-12-21 21:29:43,245 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:43,245 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:29:43,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225641637] [2020-12-21 21:29:43,246 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:29:43,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:43,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:29:43,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:29:43,248 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 17 states. [2020-12-21 21:29:43,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:43,421 INFO L93 Difference]: Finished difference Result 149 states and 157 transitions. [2020-12-21 21:29:43,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:29:43,421 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 76 [2020-12-21 21:29:43,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:43,422 INFO L225 Difference]: With dead ends: 149 [2020-12-21 21:29:43,422 INFO L226 Difference]: Without dead ends: 86 [2020-12-21 21:29:43,423 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 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 21:29:43,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-12-21 21:29:43,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-12-21 21:29:43,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-12-21 21:29:43,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2020-12-21 21:29:43,429 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 76 [2020-12-21 21:29:43,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:43,429 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2020-12-21 21:29:43,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:29:43,429 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2020-12-21 21:29:43,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-12-21 21:29:43,430 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:43,430 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:43,645 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:29:43,646 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:43,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:43,647 INFO L82 PathProgramCache]: Analyzing trace with hash 510645060, now seen corresponding path program 14 times [2020-12-21 21:29:43,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:43,648 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112775564] [2020-12-21 21:29:43,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:43,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:43,836 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:29:43,837 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112775564] [2020-12-21 21:29:43,837 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042198728] [2020-12-21 21:29:43,837 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 21:29:43,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:43,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:43,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:29:43,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:44,010 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:29:44,011 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:44,011 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:29:44,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961626559] [2020-12-21 21:29:44,012 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:29:44,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:44,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:29:44,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:29:44,013 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand 18 states. [2020-12-21 21:29:44,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:44,174 INFO L93 Difference]: Finished difference Result 158 states and 166 transitions. [2020-12-21 21:29:44,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:29:44,176 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2020-12-21 21:29:44,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:44,177 INFO L225 Difference]: With dead ends: 158 [2020-12-21 21:29:44,177 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:29:44,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 81 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 21:29:44,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:29:44,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2020-12-21 21:29:44,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-12-21 21:29:44,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-12-21 21:29:44,184 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 81 [2020-12-21 21:29:44,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:44,187 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-12-21 21:29:44,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:29:44,187 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-12-21 21:29:44,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-12-21 21:29:44,188 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:44,188 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:44,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:44,403 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:44,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:44,404 INFO L82 PathProgramCache]: Analyzing trace with hash -498582341, now seen corresponding path program 15 times [2020-12-21 21:29:44,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:44,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707866352] [2020-12-21 21:29:44,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:44,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:44,634 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-21 21:29:44,635 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707866352] [2020-12-21 21:29:44,635 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773836958] [2020-12-21 21:29:44,635 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 21:29:47,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:29:47,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:47,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:29:47,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:47,289 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2020-12-21 21:29:47,289 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:47,289 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:29:47,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111015667] [2020-12-21 21:29:47,290 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:29:47,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:47,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:29:47,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:29:47,291 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 19 states. [2020-12-21 21:29:47,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:47,449 INFO L93 Difference]: Finished difference Result 167 states and 175 transitions. [2020-12-21 21:29:47,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:29:47,450 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 86 [2020-12-21 21:29:47,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:47,451 INFO L225 Difference]: With dead ends: 167 [2020-12-21 21:29:47,451 INFO L226 Difference]: Without dead ends: 96 [2020-12-21 21:29:47,452 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 86 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 21:29:47,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-12-21 21:29:47,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2020-12-21 21:29:47,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-12-21 21:29:47,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 97 transitions. [2020-12-21 21:29:47,457 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 97 transitions. Word has length 86 [2020-12-21 21:29:47,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:47,457 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 97 transitions. [2020-12-21 21:29:47,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:29:47,458 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 97 transitions. [2020-12-21 21:29:47,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-12-21 21:29:47,458 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:47,459 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:47,672 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:29:47,673 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:47,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:47,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1720143460, now seen corresponding path program 16 times [2020-12-21 21:29:47,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:47,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274874985] [2020-12-21 21:29:47,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:47,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:47,941 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2020-12-21 21:29:47,941 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274874985] [2020-12-21 21:29:47,941 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270348626] [2020-12-21 21:29:47,941 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 21:29:48,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:48,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:48,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:29:48,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-12-21 21:29:48,202 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:48,203 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:29:48,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946024164] [2020-12-21 21:29:48,204 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:29:48,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:48,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:29:48,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:29:48,207 INFO L87 Difference]: Start difference. First operand 94 states and 97 transitions. Second operand 20 states. [2020-12-21 21:29:48,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:48,391 INFO L93 Difference]: Finished difference Result 176 states and 184 transitions. [2020-12-21 21:29:48,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:29:48,392 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 91 [2020-12-21 21:29:48,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:48,393 INFO L225 Difference]: With dead ends: 176 [2020-12-21 21:29:48,393 INFO L226 Difference]: Without dead ends: 101 [2020-12-21 21:29:48,394 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 91 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 21:29:48,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-12-21 21:29:48,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2020-12-21 21:29:48,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-12-21 21:29:48,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-12-21 21:29:48,400 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 91 [2020-12-21 21:29:48,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:48,400 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-12-21 21:29:48,400 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:29:48,400 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-12-21 21:29:48,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-12-21 21:29:48,401 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:48,401 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:48,614 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:29:48,615 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:48,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:48,616 INFO L82 PathProgramCache]: Analyzing trace with hash -682438317, now seen corresponding path program 17 times [2020-12-21 21:29:48,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:48,616 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53023435] [2020-12-21 21:29:48,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:48,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:48,936 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2020-12-21 21:29:48,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53023435] [2020-12-21 21:29:48,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393458797] [2020-12-21 21:29:48,937 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