java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-crafted/zero_sum_const1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:41:12,943 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:41:12,945 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:41:12,964 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:41:12,964 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:41:12,967 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:41:12,969 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:41:12,978 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:41:12,980 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:41:12,981 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:41:12,983 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:41:12,985 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:41:12,985 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:41:12,986 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:41:12,990 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:41:12,992 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:41:12,993 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:41:12,996 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:41:12,999 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:41:13,002 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:41:13,006 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:41:13,007 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:41:13,010 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:41:13,010 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:41:13,014 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-14 21:41:13,014 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-14 21:41:13,015 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-14 21:41:13,016 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-14 21:41:13,017 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-14 21:41:13,019 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-14 21:41:13,019 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:41:13,021 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:41:13,022 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:41:13,022 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:41:13,024 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:41:13,024 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:41:13,025 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:41:13,025 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:41:13,026 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:41:13,027 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:41:13,029 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:41:13,029 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:41:13,057 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:41:13,058 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:41:13,059 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:41:13,059 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:41:13,059 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:41:13,060 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:41:13,060 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:41:13,060 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:41:13,060 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:41:13,060 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:41:13,061 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:41:13,062 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:41:13,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:41:13,062 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:41:13,062 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:41:13,062 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:41:13,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:41:13,063 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:41:13,063 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:41:13,063 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:41:13,063 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:41:13,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:41:13,064 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:41:13,064 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:41:13,341 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:41:13,355 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:41:13,358 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:41:13,360 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:41:13,360 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:41:13,361 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-10-14 21:41:13,423 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff0561dd3/4826e7689e154cc2adc742d6b875ddaa/FLAGdbde09142 [2019-10-14 21:41:13,859 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:41:13,860 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-10-14 21:41:13,866 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff0561dd3/4826e7689e154cc2adc742d6b875ddaa/FLAGdbde09142 [2019-10-14 21:41:14,293 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff0561dd3/4826e7689e154cc2adc742d6b875ddaa [2019-10-14 21:41:14,303 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:41:14,306 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:41:14,307 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:41:14,308 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:41:14,315 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:41:14,316 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,319 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64a2e2ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14, skipping insertion in model container [2019-10-14 21:41:14,319 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,327 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:41:14,345 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:41:14,574 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:41:14,584 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:41:14,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:41:14,622 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:41:14,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14 WrapperNode [2019-10-14 21:41:14,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:41:14,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:41:14,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:41:14,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:41:14,727 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,728 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,742 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,755 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,761 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (1/1) ... [2019-10-14 21:41:14,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:41:14,764 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:41:14,764 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:41:14,765 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:41:14,765 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (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 [2019-10-14 21:41:14,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:41:14,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:41:14,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:41:14,827 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-14 21:41:14,827 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:41:14,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:41:15,085 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:41:15,085 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:41:15,087 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:41:15 BoogieIcfgContainer [2019-10-14 21:41:15,087 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:41:15,088 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:41:15,089 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:41:15,092 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:41:15,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:41:14" (1/3) ... [2019-10-14 21:41:15,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0d7022 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:41:15, skipping insertion in model container [2019-10-14 21:41:15,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:41:14" (2/3) ... [2019-10-14 21:41:15,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0d7022 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:41:15, skipping insertion in model container [2019-10-14 21:41:15,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:41:15" (3/3) ... [2019-10-14 21:41:15,097 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2019-10-14 21:41:15,114 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:41:15,134 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:41:15,155 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:41:15,177 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:41:15,178 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:41:15,178 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:41:15,178 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:41:15,178 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:41:15,178 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:41:15,178 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:41:15,178 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:41:15,193 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:41:15,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:41:15,198 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:15,199 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:15,201 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:15,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:15,206 INFO L82 PathProgramCache]: Analyzing trace with hash -39751432, now seen corresponding path program 1 times [2019-10-14 21:41:15,213 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:15,214 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44620120] [2019-10-14 21:41:15,214 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,214 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,215 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:15,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:15,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44620120] [2019-10-14 21:41:15,407 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:15,408 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:41:15,408 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295755612] [2019-10-14 21:41:15,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:41:15,412 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:15,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:41:15,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:41:15,426 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:41:15,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:15,544 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2019-10-14 21:41:15,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:41:15,546 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-14 21:41:15,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:15,553 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:41:15,554 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 21:41:15,557 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:41:15,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 21:41:15,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-14 21:41:15,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 21:41:15,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-14 21:41:15,593 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2019-10-14 21:41:15,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:15,593 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-14 21:41:15,594 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:41:15,594 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-14 21:41:15,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:41:15,595 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:15,595 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:15,595 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:15,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:15,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1179444838, now seen corresponding path program 1 times [2019-10-14 21:41:15,596 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:15,597 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436097138] [2019-10-14 21:41:15,597 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,597 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,597 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:15,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,731 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:15,732 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436097138] [2019-10-14 21:41:15,732 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:15,732 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-14 21:41:15,733 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822707126] [2019-10-14 21:41:15,734 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:41:15,735 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:15,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:41:15,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:41:15,736 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2019-10-14 21:41:15,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:15,882 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-10-14 21:41:15,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:15,883 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-10-14 21:41:15,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:15,884 INFO L225 Difference]: With dead ends: 28 [2019-10-14 21:41:15,884 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 21:41:15,886 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:41:15,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 21:41:15,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-10-14 21:41:15,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 21:41:15,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-10-14 21:41:15,893 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-10-14 21:41:15,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:15,893 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-10-14 21:41:15,894 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:41:15,894 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-10-14 21:41:15,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:41:15,895 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:15,895 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:15,895 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:15,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:15,896 INFO L82 PathProgramCache]: Analyzing trace with hash 621827044, now seen corresponding path program 1 times [2019-10-14 21:41:15,896 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:15,896 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808407603] [2019-10-14 21:41:15,897 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,897 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:15,897 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:15,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:15,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:41:15,980 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808407603] [2019-10-14 21:41:15,980 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:15,981 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:41:15,981 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361263249] [2019-10-14 21:41:15,981 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:41:15,981 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:15,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:41:15,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:41:15,982 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 4 states. [2019-10-14 21:41:16,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:16,067 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2019-10-14 21:41:16,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:41:16,069 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-14 21:41:16,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:16,070 INFO L225 Difference]: With dead ends: 39 [2019-10-14 21:41:16,070 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:41:16,071 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:41:16,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:41:16,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-14 21:41:16,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:41:16,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-10-14 21:41:16,087 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 18 [2019-10-14 21:41:16,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:16,087 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-10-14 21:41:16,087 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:41:16,088 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-10-14 21:41:16,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:41:16,089 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:16,090 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:16,090 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:16,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:16,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1263872610, now seen corresponding path program 1 times [2019-10-14 21:41:16,092 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:16,092 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482705564] [2019-10-14 21:41:16,092 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,093 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:16,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:41:16,219 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482705564] [2019-10-14 21:41:16,219 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:41:16,220 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-14 21:41:16,220 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789377436] [2019-10-14 21:41:16,221 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:41:16,221 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:16,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:41:16,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:41:16,222 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 5 states. [2019-10-14 21:41:16,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:16,322 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2019-10-14 21:41:16,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:16,323 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-10-14 21:41:16,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:16,324 INFO L225 Difference]: With dead ends: 35 [2019-10-14 21:41:16,324 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:41:16,324 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:41:16,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:41:16,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2019-10-14 21:41:16,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 21:41:16,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-10-14 21:41:16,331 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20 [2019-10-14 21:41:16,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:16,331 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-10-14 21:41:16,331 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:41:16,331 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-10-14 21:41:16,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 21:41:16,332 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:16,332 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:16,332 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:16,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:16,333 INFO L82 PathProgramCache]: Analyzing trace with hash 245922080, now seen corresponding path program 1 times [2019-10-14 21:41:16,333 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:16,333 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768825294] [2019-10-14 21:41:16,334 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,334 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,334 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:16,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:41:16,414 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768825294] [2019-10-14 21:41:16,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059945148] [2019-10-14 21:41:16,415 INFO L94 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 [2019-10-14 21:41:16,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,489 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:41:16,498 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:16,563 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:41:16,564 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:16,564 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-10-14 21:41:16,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069359486] [2019-10-14 21:41:16,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:41:16,565 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:16,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:41:16,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:41:16,568 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2019-10-14 21:41:16,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:16,676 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-10-14 21:41:16,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:41:16,678 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-10-14 21:41:16,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:16,678 INFO L225 Difference]: With dead ends: 39 [2019-10-14 21:41:16,679 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:41:16,679 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:41:16,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:41:16,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-10-14 21:41:16,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:41:16,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2019-10-14 21:41:16,686 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2019-10-14 21:41:16,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:16,686 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2019-10-14 21:41:16,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:41:16,686 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2019-10-14 21:41:16,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 21:41:16,689 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:16,689 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:16,889 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:16,890 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:16,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:16,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1099030686, now seen corresponding path program 2 times [2019-10-14 21:41:16,891 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:16,891 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24754743] [2019-10-14 21:41:16,891 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,891 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:16,892 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:16,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:16,994 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 21:41:16,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24754743] [2019-10-14 21:41:16,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83935935] [2019-10-14 21:41:16,994 INFO L92 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 [2019-10-14 21:41:17,040 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:41:17,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:17,043 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:41:17,045 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:17,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-14 21:41:17,101 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:17,101 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2019-10-14 21:41:17,102 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847513172] [2019-10-14 21:41:17,102 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:41:17,103 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:17,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:41:17,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:41:17,103 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2019-10-14 21:41:17,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:17,247 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2019-10-14 21:41:17,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:41:17,247 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-10-14 21:41:17,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:17,248 INFO L225 Difference]: With dead ends: 41 [2019-10-14 21:41:17,248 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 21:41:17,249 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:41:17,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 21:41:17,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2019-10-14 21:41:17,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 21:41:17,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-14 21:41:17,258 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-10-14 21:41:17,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:17,259 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-14 21:41:17,259 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:41:17,261 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-14 21:41:17,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 21:41:17,262 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:17,262 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:17,466 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:17,466 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:17,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:17,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1291933786, now seen corresponding path program 3 times [2019-10-14 21:41:17,467 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:17,467 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974827457] [2019-10-14 21:41:17,468 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:17,468 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:17,469 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:17,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:18,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:18,161 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:18,161 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974827457] [2019-10-14 21:41:18,162 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58898899] [2019-10-14 21:41:18,162 INFO L92 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 [2019-10-14 21:41:18,223 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:41:18,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:18,226 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 35 conjunts are in the unsatisfiable core [2019-10-14 21:41:18,230 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:18,922 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:18,923 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2019-10-14 21:41:18,924 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-10-14 21:41:18,936 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:18,937 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:18,942 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-10-14 21:41:18,942 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:31 [2019-10-14 21:41:19,019 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:19,114 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:19,133 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:19,193 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:19,194 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:19,194 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20] total 35 [2019-10-14 21:41:19,194 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233922715] [2019-10-14 21:41:19,195 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 21:41:19,195 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:19,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 21:41:19,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1080, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:41:19,196 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 35 states. [2019-10-14 21:41:20,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:20,580 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2019-10-14 21:41:20,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:41:20,581 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 28 [2019-10-14 21:41:20,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:20,582 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:41:20,583 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:41:20,584 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=236, Invalid=2314, Unknown=0, NotChecked=0, Total=2550 [2019-10-14 21:41:20,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:41:20,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 34. [2019-10-14 21:41:20,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:41:20,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-14 21:41:20,592 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 28 [2019-10-14 21:41:20,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:20,592 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-14 21:41:20,592 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 21:41:20,592 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-14 21:41:20,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 21:41:20,593 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:20,594 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:20,796 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:20,797 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:20,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:20,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1349523672, now seen corresponding path program 4 times [2019-10-14 21:41:20,798 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:20,799 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293092020] [2019-10-14 21:41:20,799 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,799 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:20,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:20,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:20,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:20,891 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:41:20,891 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293092020] [2019-10-14 21:41:20,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652023040] [2019-10-14 21:41:20,892 INFO L92 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 [2019-10-14 21:41:20,941 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:41:20,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:20,943 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:41:20,945 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:21,034 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:41:21,035 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:21,035 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-10-14 21:41:21,035 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247710325] [2019-10-14 21:41:21,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:41:21,036 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:21,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:41:21,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:41:21,037 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 14 states. [2019-10-14 21:41:21,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:21,320 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2019-10-14 21:41:21,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:41:21,320 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-10-14 21:41:21,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:21,322 INFO L225 Difference]: With dead ends: 69 [2019-10-14 21:41:21,322 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:41:21,323 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:41:21,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:41:21,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2019-10-14 21:41:21,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 21:41:21,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-10-14 21:41:21,329 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2019-10-14 21:41:21,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:21,330 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-10-14 21:41:21,330 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:41:21,330 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-10-14 21:41:21,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:41:21,331 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:21,331 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:21,541 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:21,542 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:21,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:21,543 INFO L82 PathProgramCache]: Analyzing trace with hash 28770966, now seen corresponding path program 5 times [2019-10-14 21:41:21,543 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:21,544 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253162198] [2019-10-14 21:41:21,544 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:21,544 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:21,545 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:21,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:21,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:21,668 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:21,669 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253162198] [2019-10-14 21:41:21,669 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522132149] [2019-10-14 21:41:21,669 INFO L92 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 [2019-10-14 21:41:21,742 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:41:21,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:21,743 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:41:21,745 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:21,824 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:21,825 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:21,825 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-10-14 21:41:21,825 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18633368] [2019-10-14 21:41:21,826 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:41:21,826 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:21,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:41:21,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:41:21,827 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 14 states. [2019-10-14 21:41:22,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:22,104 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2019-10-14 21:41:22,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:41:22,105 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2019-10-14 21:41:22,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:22,106 INFO L225 Difference]: With dead ends: 42 [2019-10-14 21:41:22,106 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:41:22,107 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:41:22,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:41:22,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-10-14 21:41:22,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-14 21:41:22,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-10-14 21:41:22,114 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2019-10-14 21:41:22,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:22,115 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-10-14 21:41:22,115 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:41:22,115 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-10-14 21:41:22,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 21:41:22,116 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:22,116 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:22,319 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:22,319 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:22,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:22,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1369168876, now seen corresponding path program 6 times [2019-10-14 21:41:22,320 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:22,320 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126136664] [2019-10-14 21:41:22,320 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:22,321 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:22,321 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:22,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:23,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:23,937 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:23,938 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126136664] [2019-10-14 21:41:23,938 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242368832] [2019-10-14 21:41:23,939 INFO L92 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 [2019-10-14 21:41:23,987 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:41:23,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:23,989 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 44 conjunts are in the unsatisfiable core [2019-10-14 21:41:23,998 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:24,598 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:24,663 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:24,663 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:24,663 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21] total 44 [2019-10-14 21:41:24,663 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325144830] [2019-10-14 21:41:24,664 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-14 21:41:24,664 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:24,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-14 21:41:24,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2019-10-14 21:41:24,666 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 44 states. [2019-10-14 21:41:28,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:28,745 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2019-10-14 21:41:28,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-10-14 21:41:28,746 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 34 [2019-10-14 21:41:28,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:28,749 INFO L225 Difference]: With dead ends: 70 [2019-10-14 21:41:28,750 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:41:28,752 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=721, Invalid=5921, Unknown=0, NotChecked=0, Total=6642 [2019-10-14 21:41:28,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:41:28,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 40. [2019-10-14 21:41:28,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:41:28,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-14 21:41:28,762 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 34 [2019-10-14 21:41:28,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:28,763 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-14 21:41:28,763 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-14 21:41:28,763 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-14 21:41:28,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-14 21:41:28,764 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:28,764 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:28,977 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:28,978 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:28,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:28,979 INFO L82 PathProgramCache]: Analyzing trace with hash -464593390, now seen corresponding path program 7 times [2019-10-14 21:41:28,979 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:28,980 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267672193] [2019-10-14 21:41:28,980 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:28,980 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:28,980 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:28,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:29,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:29,101 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:29,101 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267672193] [2019-10-14 21:41:29,101 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844127798] [2019-10-14 21:41:29,102 INFO L92 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 [2019-10-14 21:41:29,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:29,176 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:41:29,179 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:29,293 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:29,294 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:29,294 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-14 21:41:29,294 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492430730] [2019-10-14 21:41:29,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:41:29,296 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:29,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:41:29,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:41:29,297 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 17 states. [2019-10-14 21:41:29,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:29,591 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2019-10-14 21:41:29,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:41:29,591 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-10-14 21:41:29,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:29,592 INFO L225 Difference]: With dead ends: 81 [2019-10-14 21:41:29,592 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:41:29,593 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:41:29,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:41:29,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 39. [2019-10-14 21:41:29,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 21:41:29,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-10-14 21:41:29,612 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 36 [2019-10-14 21:41:29,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:29,612 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-10-14 21:41:29,612 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:41:29,612 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-10-14 21:41:29,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:41:29,613 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:29,614 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:29,814 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:29,815 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:29,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:29,816 INFO L82 PathProgramCache]: Analyzing trace with hash 541401424, now seen corresponding path program 8 times [2019-10-14 21:41:29,816 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:29,816 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952499270] [2019-10-14 21:41:29,817 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:29,817 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:29,817 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:29,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:29,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:29,920 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:41:29,921 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952499270] [2019-10-14 21:41:29,921 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286503938] [2019-10-14 21:41:29,921 INFO L92 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 [2019-10-14 21:41:29,983 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:41:29,984 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:29,984 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:41:29,996 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:30,062 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:41:30,062 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:30,062 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-10-14 21:41:30,063 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067575172] [2019-10-14 21:41:30,063 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:41:30,063 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:30,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:41:30,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:41:30,064 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 17 states. [2019-10-14 21:41:30,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:30,363 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-10-14 21:41:30,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:41:30,364 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2019-10-14 21:41:30,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:30,365 INFO L225 Difference]: With dead ends: 48 [2019-10-14 21:41:30,365 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:41:30,366 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:41:30,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:41:30,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-10-14 21:41:30,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-14 21:41:30,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-10-14 21:41:30,373 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 38 [2019-10-14 21:41:30,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:30,374 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-10-14 21:41:30,374 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:41:30,374 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-10-14 21:41:30,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 21:41:30,375 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:30,375 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:30,578 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:30,579 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:30,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:30,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1642429518, now seen corresponding path program 9 times [2019-10-14 21:41:30,580 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:30,580 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152990220] [2019-10-14 21:41:30,580 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:30,581 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:30,581 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:30,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:31,333 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2019-10-14 21:41:31,567 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 35 [2019-10-14 21:41:31,728 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 39 [2019-10-14 21:41:32,068 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 44 [2019-10-14 21:41:32,479 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 46 [2019-10-14 21:41:32,624 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2019-10-14 21:41:33,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:33,938 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:33,939 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152990220] [2019-10-14 21:41:33,939 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742926669] [2019-10-14 21:41:33,939 INFO L92 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 [2019-10-14 21:41:33,993 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-14 21:41:33,993 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:33,995 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 52 conjunts are in the unsatisfiable core [2019-10-14 21:41:33,998 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:34,058 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-14 21:41:34,058 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:34,065 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:34,065 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:34,065 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-10-14 21:41:35,595 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:35,598 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:35,600 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:35,602 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:41:35,603 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:41:35,626 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:35,627 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 46 treesize of output 69 [2019-10-14 21:41:35,629 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,630 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,630 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,631 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,631 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,632 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 4 xjuncts. [2019-10-14 21:41:35,679 INFO L567 ElimStorePlain]: treesize reduction 97, result has 26.5 percent of original size [2019-10-14 21:41:35,680 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,681 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:35,682 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2019-10-14 21:41:35,760 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,846 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,870 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:35,976 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 7 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:41:35,976 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:35,976 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 26] total 57 [2019-10-14 21:41:35,976 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241310395] [2019-10-14 21:41:35,977 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-10-14 21:41:35,977 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:35,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-10-14 21:41:35,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2918, Unknown=0, NotChecked=0, Total=3192 [2019-10-14 21:41:35,978 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 57 states. [2019-10-14 21:41:37,800 WARN L191 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 68 [2019-10-14 21:41:38,531 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 47 [2019-10-14 21:41:38,752 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2019-10-14 21:41:38,980 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 57 [2019-10-14 21:41:39,767 WARN L191 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 87 [2019-10-14 21:41:40,499 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 58 [2019-10-14 21:41:40,805 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 59 [2019-10-14 21:41:41,062 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 50 [2019-10-14 21:41:41,313 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 51 [2019-10-14 21:41:42,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:42,027 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2019-10-14 21:41:42,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 21:41:42,027 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 40 [2019-10-14 21:41:42,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:42,029 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:41:42,029 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:41:42,032 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2054 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=806, Invalid=7026, Unknown=0, NotChecked=0, Total=7832 [2019-10-14 21:41:42,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:41:42,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2019-10-14 21:41:42,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:41:42,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-14 21:41:42,043 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-10-14 21:41:42,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:42,043 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-14 21:41:42,043 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-10-14 21:41:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-14 21:41:42,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 21:41:42,044 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:42,044 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:42,248 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:42,248 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:42,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:42,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1126494260, now seen corresponding path program 10 times [2019-10-14 21:41:42,249 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:42,249 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685726023] [2019-10-14 21:41:42,250 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:42,250 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:42,250 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:42,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:42,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:42,370 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:41:42,370 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685726023] [2019-10-14 21:41:42,370 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670765166] [2019-10-14 21:41:42,370 INFO L92 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 [2019-10-14 21:41:42,424 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:41:42,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:42,425 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:41:42,427 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:42,524 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:41:42,524 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:42,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-10-14 21:41:42,525 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462871617] [2019-10-14 21:41:42,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:41:42,525 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:42,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:41:42,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:41:42,526 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 20 states. [2019-10-14 21:41:42,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:42,797 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2019-10-14 21:41:42,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:41:42,797 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-10-14 21:41:42,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:42,798 INFO L225 Difference]: With dead ends: 93 [2019-10-14 21:41:42,798 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:41:42,799 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:41:42,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:41:42,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 45. [2019-10-14 21:41:42,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 21:41:42,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-10-14 21:41:42,807 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 42 [2019-10-14 21:41:42,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:42,807 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-10-14 21:41:42,808 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:41:42,808 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-10-14 21:41:42,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:41:42,808 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:42,809 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:43,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:43,012 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:43,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:43,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1911524490, now seen corresponding path program 11 times [2019-10-14 21:41:43,013 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:43,013 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529671121] [2019-10-14 21:41:43,013 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:43,013 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:43,013 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:43,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:43,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:43,129 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:41:43,129 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529671121] [2019-10-14 21:41:43,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057349018] [2019-10-14 21:41:43,131 INFO L92 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 [2019-10-14 21:41:43,255 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:41:43,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:43,258 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:41:43,260 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:41:43,380 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:43,381 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-10-14 21:41:43,381 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26100171] [2019-10-14 21:41:43,382 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:41:43,383 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:43,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:41:43,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:41:43,383 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 20 states. [2019-10-14 21:41:43,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:43,800 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2019-10-14 21:41:43,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:41:43,800 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2019-10-14 21:41:43,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:43,801 INFO L225 Difference]: With dead ends: 54 [2019-10-14 21:41:43,801 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:41:43,802 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:41:43,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:41:43,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-10-14 21:41:43,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-14 21:41:43,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-10-14 21:41:43,816 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2019-10-14 21:41:43,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:43,816 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-10-14 21:41:43,816 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:41:43,816 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-10-14 21:41:43,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:41:43,820 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:43,820 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:44,021 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:44,021 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:44,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:44,021 INFO L82 PathProgramCache]: Analyzing trace with hash -224263928, now seen corresponding path program 12 times [2019-10-14 21:41:44,021 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:44,022 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714670964] [2019-10-14 21:41:44,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:44,022 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:44,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:44,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:44,960 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 43 [2019-10-14 21:41:45,125 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 47 [2019-10-14 21:41:46,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:46,678 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 12 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:41:46,678 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714670964] [2019-10-14 21:41:46,678 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227723697] [2019-10-14 21:41:46,678 INFO L92 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 [2019-10-14 21:41:46,740 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2019-10-14 21:41:46,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:46,743 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-14 21:41:46,745 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:46,786 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-10-14 21:41:46,786 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:46,793 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:46,794 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:46,794 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-10-14 21:41:48,552 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:41:48,563 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:41:48,564 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 36 [2019-10-14 21:41:48,565 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:41:48,592 INFO L567 ElimStorePlain]: treesize reduction 16, result has 69.2 percent of original size [2019-10-14 21:41:48,593 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:48,594 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:41:48,595 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:46, output treesize:20 [2019-10-14 21:41:48,677 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:48,763 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:48,784 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:41:48,910 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 50 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:41:48,911 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:48,911 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30] total 63 [2019-10-14 21:41:48,911 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474091964] [2019-10-14 21:41:48,912 INFO L442 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-10-14 21:41:48,912 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:48,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-10-14 21:41:48,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=3510, Unknown=0, NotChecked=0, Total=3906 [2019-10-14 21:41:48,914 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 63 states. [2019-10-14 21:41:54,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:54,301 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2019-10-14 21:41:54,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-10-14 21:41:54,302 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 46 [2019-10-14 21:41:54,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:54,303 INFO L225 Difference]: With dead ends: 67 [2019-10-14 21:41:54,303 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:41:54,306 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2587 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=990, Invalid=8910, Unknown=0, NotChecked=0, Total=9900 [2019-10-14 21:41:54,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:41:54,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2019-10-14 21:41:54,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:41:54,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 21:41:54,315 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 46 [2019-10-14 21:41:54,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:54,315 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 21:41:54,315 INFO L463 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-10-14 21:41:54,316 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 21:41:54,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 21:41:54,316 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:54,316 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:54,520 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:54,520 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:54,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:54,521 INFO L82 PathProgramCache]: Analyzing trace with hash 277433862, now seen corresponding path program 13 times [2019-10-14 21:41:54,521 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:54,522 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489778915] [2019-10-14 21:41:54,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:54,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:54,522 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:54,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:54,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:54,672 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:41:54,674 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489778915] [2019-10-14 21:41:54,674 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212238606] [2019-10-14 21:41:54,674 INFO L92 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 [2019-10-14 21:41:54,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:54,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:41:54,743 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:54,841 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:41:54,841 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:54,841 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-10-14 21:41:54,842 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720996196] [2019-10-14 21:41:54,842 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:41:54,842 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:54,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:41:54,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=387, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:41:54,843 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 23 states. [2019-10-14 21:41:55,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:55,180 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2019-10-14 21:41:55,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:41:55,180 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-10-14 21:41:55,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:55,181 INFO L225 Difference]: With dead ends: 105 [2019-10-14 21:41:55,181 INFO L226 Difference]: Without dead ends: 61 [2019-10-14 21:41:55,183 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:41:55,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-14 21:41:55,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 51. [2019-10-14 21:41:55,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-14 21:41:55,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-10-14 21:41:55,191 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 48 [2019-10-14 21:41:55,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:55,191 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-10-14 21:41:55,191 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:41:55,191 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-10-14 21:41:55,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:41:55,192 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:55,192 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:55,399 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:55,400 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:55,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:55,400 INFO L82 PathProgramCache]: Analyzing trace with hash 2021844036, now seen corresponding path program 14 times [2019-10-14 21:41:55,401 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:55,401 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217714814] [2019-10-14 21:41:55,401 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:55,401 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:55,402 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:55,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:55,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:55,533 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:41:55,534 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217714814] [2019-10-14 21:41:55,534 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998690780] [2019-10-14 21:41:55,534 INFO L92 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 [2019-10-14 21:41:55,596 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:41:55,596 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:41:55,597 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:41:55,598 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:41:55,682 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:41:55,683 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:41:55,683 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-10-14 21:41:55,683 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351555830] [2019-10-14 21:41:55,684 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:41:55,684 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:41:55,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:41:55,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:41:55,684 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 23 states. [2019-10-14 21:41:56,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:41:56,133 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2019-10-14 21:41:56,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:41:56,134 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2019-10-14 21:41:56,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:41:56,135 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:41:56,135 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:41:56,136 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=272, Invalid=988, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:41:56,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:41:56,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2019-10-14 21:41:56,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 21:41:56,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-10-14 21:41:56,145 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 50 [2019-10-14 21:41:56,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:41:56,145 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-10-14 21:41:56,145 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:41:56,145 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-10-14 21:41:56,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-14 21:41:56,146 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:41:56,146 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:41:56,349 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:41:56,350 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:41:56,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:41:56,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1581362622, now seen corresponding path program 15 times [2019-10-14 21:41:56,351 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:41:56,351 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099605638] [2019-10-14 21:41:56,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:56,352 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:41:56,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:41:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:41:57,341 WARN L191 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 37