/usr/bin/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-examples/standard_strcpy_original-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:47:11,809 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:47:11,811 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:47:11,829 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:47:11,830 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:47:11,831 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:47:11,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:47:11,845 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:47:11,848 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:47:11,849 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:47:11,853 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:47:11,854 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:47:11,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:47:11,855 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:47:11,857 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:47:11,860 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:47:11,861 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:47:11,863 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:47:11,865 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:47:11,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:47:11,874 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:47:11,875 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:47:11,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:47:11,877 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:47:11,879 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:47:11,891 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:47:11,895 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:47:11,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:47:11,897 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 [2019-11-06 18:47:11,915 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:47:11,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:47:11,917 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:47:11,917 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:47:11,918 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:47:11,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:47:11,918 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:47:11,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:47:11,919 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:47:11,919 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:47:11,920 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:47:11,920 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:47:11,920 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:47:11,921 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:47:11,921 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:47:11,921 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:47:11,921 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:47:11,921 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:47:11,922 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:47:11,922 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:47:11,922 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:47:11,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:47:11,922 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:47:11,923 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:47:11,923 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:47:11,923 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:47:11,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:47:11,923 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:47:11,924 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:47:12,181 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:47:12,194 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:47:12,197 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:47:12,198 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:47:12,198 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:47:12,199 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_strcpy_original-2.i [2019-11-06 18:47:12,264 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3883b5025/24678aa7badf48438685c094a8ea294b/FLAG8cd6602d7 [2019-11-06 18:47:12,700 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:47:12,701 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_strcpy_original-2.i [2019-11-06 18:47:12,707 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3883b5025/24678aa7badf48438685c094a8ea294b/FLAG8cd6602d7 [2019-11-06 18:47:13,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3883b5025/24678aa7badf48438685c094a8ea294b [2019-11-06 18:47:13,130 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:47:13,132 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:47:13,133 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:13,133 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:47:13,136 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:47:13,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,140 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b4170af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13, skipping insertion in model container [2019-11-06 18:47:13,140 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,147 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:47:13,163 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:47:13,335 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:13,339 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:47:13,361 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:47:13,456 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:47:13,456 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13 WrapperNode [2019-11-06 18:47:13,457 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:47:13,457 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:47:13,457 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:47:13,458 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:47:13,469 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,476 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,476 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,491 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,497 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,500 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (1/1) ... [2019-11-06 18:47:13,502 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:47:13,503 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:47:13,503 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:47:13,503 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:47:13,504 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (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 [2019-11-06 18:47:13,558 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:47:13,558 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:47:13,559 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:47:13,559 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:47:13,559 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:47:13,559 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:47:13,559 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:47:13,559 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:47:13,559 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:47:13,560 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:47:13,560 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:47:13,560 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:47:13,560 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:47:13,560 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:47:13,784 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:47:13,784 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:47:13,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:13 BoogieIcfgContainer [2019-11-06 18:47:13,786 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:47:13,795 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:47:13,795 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:47:13,800 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:47:13,800 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:47:13" (1/3) ... [2019-11-06 18:47:13,802 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@613d00b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:13, skipping insertion in model container [2019-11-06 18:47:13,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:47:13" (2/3) ... [2019-11-06 18:47:13,803 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@613d00b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:47:13, skipping insertion in model container [2019-11-06 18:47:13,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:47:13" (3/3) ... [2019-11-06 18:47:13,805 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_strcpy_original-2.i [2019-11-06 18:47:13,837 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:47:13,846 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:47:13,858 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:47:13,883 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:47:13,883 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:47:13,883 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:47:13,883 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:47:13,884 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:47:13,884 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:47:13,884 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:47:13,884 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:47:13,903 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:47:13,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:47:13,908 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:13,910 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:13,913 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:13,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:13,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1229081071, now seen corresponding path program 1 times [2019-11-06 18:47:13,925 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:13,925 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622172002] [2019-11-06 18:47:13,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:14,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:14,085 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622172002] [2019-11-06 18:47:14,086 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:14,086 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:47:14,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212511034] [2019-11-06 18:47:14,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:47:14,094 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:14,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:47:14,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:47:14,114 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:47:14,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:14,217 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2019-11-06 18:47:14,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:47:14,219 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-06 18:47:14,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:14,228 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:47:14,228 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:47:14,231 INFO L630 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 [2019-11-06 18:47:14,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:47:14,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:47:14,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:47:14,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-06 18:47:14,271 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 16 [2019-11-06 18:47:14,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:14,272 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-06 18:47:14,272 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:47:14,272 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-06 18:47:14,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:47:14,273 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:14,273 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:14,274 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:14,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:14,275 INFO L82 PathProgramCache]: Analyzing trace with hash -959296020, now seen corresponding path program 1 times [2019-11-06 18:47:14,275 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:14,275 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064028580] [2019-11-06 18:47:14,275 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:14,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064028580] [2019-11-06 18:47:14,363 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:14,365 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:47:14,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842945582] [2019-11-06 18:47:14,367 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:47:14,367 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:14,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:47:14,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:47:14,368 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 4 states. [2019-11-06 18:47:14,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:14,432 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2019-11-06 18:47:14,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:47:14,433 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-06 18:47:14,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:14,435 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:47:14,436 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 18:47:14,437 INFO L630 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 [2019-11-06 18:47:14,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 18:47:14,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-06 18:47:14,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:47:14,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-11-06 18:47:14,444 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 18 [2019-11-06 18:47:14,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:14,444 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-11-06 18:47:14,444 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:47:14,444 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-11-06 18:47:14,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:47:14,445 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:14,445 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:14,446 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:14,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:14,446 INFO L82 PathProgramCache]: Analyzing trace with hash 71345632, now seen corresponding path program 1 times [2019-11-06 18:47:14,447 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:14,447 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982744472] [2019-11-06 18:47:14,447 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:14,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:14,534 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982744472] [2019-11-06 18:47:14,534 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808332154] [2019-11-06 18:47:14,534 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 [2019-11-06 18:47:14,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:14,591 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:47:14,597 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:14,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:14,637 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:14,637 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:47:14,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915094196] [2019-11-06 18:47:14,638 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:47:14,638 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:14,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:47:14,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:14,639 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2019-11-06 18:47:14,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:14,723 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2019-11-06 18:47:14,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:47:14,725 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-11-06 18:47:14,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:14,725 INFO L225 Difference]: With dead ends: 39 [2019-11-06 18:47:14,726 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:47:14,726 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:14,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:47:14,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-06 18:47:14,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:47:14,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2019-11-06 18:47:14,736 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 19 [2019-11-06 18:47:14,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:14,737 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2019-11-06 18:47:14,737 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:47:14,738 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2019-11-06 18:47:14,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:47:14,739 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:14,739 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:14,942 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:14,947 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:14,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:14,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1956465772, now seen corresponding path program 2 times [2019-11-06 18:47:14,948 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:14,948 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610650393] [2019-11-06 18:47:14,948 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:14,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:47:15,059 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610650393] [2019-11-06 18:47:15,059 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676426535] [2019-11-06 18:47:15,060 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 [2019-11-06 18:47:15,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-11-06 18:47:15,129 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:15,130 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:47:15,132 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:15,238 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:47:15,256 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:15,256 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 18:47:15,256 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2019-11-06 18:47:15,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527234589] [2019-11-06 18:47:15,257 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:47:15,258 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:47:15,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:15,259 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 7 states. [2019-11-06 18:47:15,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:15,399 INFO L93 Difference]: Finished difference Result 51 states and 62 transitions. [2019-11-06 18:47:15,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:47:15,400 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-11-06 18:47:15,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:15,403 INFO L225 Difference]: With dead ends: 51 [2019-11-06 18:47:15,403 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:47:15,403 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:15,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:47:15,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2019-11-06 18:47:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:47:15,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-11-06 18:47:15,414 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 20 [2019-11-06 18:47:15,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:15,414 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-11-06 18:47:15,414 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:47:15,414 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-11-06 18:47:15,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:47:15,415 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:15,415 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:15,626 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:15,626 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:15,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:15,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1563438762, now seen corresponding path program 1 times [2019-11-06 18:47:15,627 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:15,627 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945713289] [2019-11-06 18:47:15,627 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:15,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:15,698 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945713289] [2019-11-06 18:47:15,698 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:47:15,698 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 18:47:15,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510913294] [2019-11-06 18:47:15,699 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 18:47:15,699 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 18:47:15,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 18:47:15,700 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2019-11-06 18:47:15,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:15,779 INFO L93 Difference]: Finished difference Result 47 states and 54 transitions. [2019-11-06 18:47:15,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:47:15,780 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-11-06 18:47:15,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:15,781 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:47:15,781 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:47:15,782 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:47:15,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:47:15,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2019-11-06 18:47:15,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-06 18:47:15,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-11-06 18:47:15,787 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 20 [2019-11-06 18:47:15,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:15,788 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-11-06 18:47:15,788 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 18:47:15,788 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-11-06 18:47:15,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:47:15,789 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:15,789 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:15,789 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:15,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:15,790 INFO L82 PathProgramCache]: Analyzing trace with hash -304823251, now seen corresponding path program 1 times [2019-11-06 18:47:15,790 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:15,790 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050601662] [2019-11-06 18:47:15,790 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:15,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,864 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:15,864 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050601662] [2019-11-06 18:47:15,865 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737559192] [2019-11-06 18:47:15,865 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-06 18:47:15,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:15,927 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:47:15,932 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:15,943 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:15,950 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:15,950 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:47:15,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585835075] [2019-11-06 18:47:15,951 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:47:15,951 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:15,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:47:15,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:15,951 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 7 states. [2019-11-06 18:47:16,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:16,022 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2019-11-06 18:47:16,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:47:16,023 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 18:47:16,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:16,023 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:47:16,023 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:47:16,024 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:47:16,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:47:16,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-06 18:47:16,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:47:16,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-11-06 18:47:16,029 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2019-11-06 18:47:16,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:16,029 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-11-06 18:47:16,029 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:47:16,030 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-11-06 18:47:16,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:47:16,030 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:16,030 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:16,231 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:16,233 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:16,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:16,234 INFO L82 PathProgramCache]: Analyzing trace with hash -81574727, now seen corresponding path program 2 times [2019-11-06 18:47:16,234 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:16,234 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216434280] [2019-11-06 18:47:16,234 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:16,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,329 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:16,329 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216434280] [2019-11-06 18:47:16,329 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494458648] [2019-11-06 18:47:16,329 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 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 [2019-11-06 18:47:16,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:16,397 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:16,397 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:16,401 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:16,419 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:16,420 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:16,420 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:47:16,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842329642] [2019-11-06 18:47:16,422 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:47:16,423 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:16,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:47:16,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:16,424 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 8 states. [2019-11-06 18:47:16,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:16,504 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2019-11-06 18:47:16,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:47:16,505 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-11-06 18:47:16,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:16,506 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:47:16,506 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:47:16,507 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:47:16,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:47:16,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-06 18:47:16,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:47:16,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-06 18:47:16,519 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 24 [2019-11-06 18:47:16,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:16,520 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-06 18:47:16,520 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:47:16,520 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-06 18:47:16,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:47:16,521 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:16,522 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:16,727 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:16,727 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:16,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:16,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1750805075, now seen corresponding path program 3 times [2019-11-06 18:47:16,728 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:16,728 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608101018] [2019-11-06 18:47:16,728 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:16,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:16,817 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:47:16,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608101018] [2019-11-06 18:47:16,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311113684] [2019-11-06 18:47:16,818 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 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 [2019-11-06 18:47:16,872 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 18:47:16,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:16,874 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 18:47:16,876 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:16,943 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-11-06 18:47:16,944 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,959 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:16,959 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,959 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-11-06 18:47:16,989 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2019-11-06 18:47:16,990 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,998 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:16,998 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:16,999 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2019-11-06 18:47:17,046 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2019-11-06 18:47:17,047 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:17,057 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:17,058 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:17,058 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2019-11-06 18:47:17,092 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:47:17,093 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:17,093 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2019-11-06 18:47:17,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204063806] [2019-11-06 18:47:17,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:47:17,094 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:17,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:47:17,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:17,095 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 14 states. [2019-11-06 18:47:17,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:17,461 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2019-11-06 18:47:17,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:47:17,464 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2019-11-06 18:47:17,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:17,465 INFO L225 Difference]: With dead ends: 57 [2019-11-06 18:47:17,465 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 18:47:17,466 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:47:17,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 18:47:17,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2019-11-06 18:47:17,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-06 18:47:17,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2019-11-06 18:47:17,472 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 25 [2019-11-06 18:47:17,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:17,472 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2019-11-06 18:47:17,472 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:47:17,473 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2019-11-06 18:47:17,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:47:17,474 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:17,474 INFO L410 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:17,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:17,678 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:17,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:17,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1844458623, now seen corresponding path program 1 times [2019-11-06 18:47:17,682 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:17,682 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030192328] [2019-11-06 18:47:17,683 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:17,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,808 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:17,808 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030192328] [2019-11-06 18:47:17,808 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219459132] [2019-11-06 18:47:17,808 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-06 18:47:17,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:17,861 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:47:17,864 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:17,879 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:17,879 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:17,879 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:47:17,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194777761] [2019-11-06 18:47:17,882 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:47:17,882 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:17,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:47:17,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:17,883 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 10 states. [2019-11-06 18:47:17,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:17,964 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2019-11-06 18:47:17,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:47:17,965 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2019-11-06 18:47:17,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:17,969 INFO L225 Difference]: With dead ends: 65 [2019-11-06 18:47:17,969 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 18:47:17,970 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:47:17,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 18:47:17,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-06 18:47:17,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 18:47:17,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-11-06 18:47:17,978 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2019-11-06 18:47:17,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:17,981 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-11-06 18:47:17,981 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:47:17,981 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-11-06 18:47:17,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 18:47:17,983 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:17,983 INFO L410 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:18,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:18,188 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:18,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:18,188 INFO L82 PathProgramCache]: Analyzing trace with hash 222681613, now seen corresponding path program 2 times [2019-11-06 18:47:18,189 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:18,189 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523254431] [2019-11-06 18:47:18,189 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:18,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,299 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:18,299 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523254431] [2019-11-06 18:47:18,299 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371252178] [2019-11-06 18:47:18,299 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 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 [2019-11-06 18:47:18,350 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:18,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:18,351 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:47:18,353 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:18,385 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:18,385 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:47:18,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518818502] [2019-11-06 18:47:18,388 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:47:18,389 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:18,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:47:18,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:18,389 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 11 states. [2019-11-06 18:47:18,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:18,464 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2019-11-06 18:47:18,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:47:18,464 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2019-11-06 18:47:18,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:18,465 INFO L225 Difference]: With dead ends: 66 [2019-11-06 18:47:18,465 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 18:47:18,466 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:47:18,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 18:47:18,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-11-06 18:47:18,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:47:18,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-11-06 18:47:18,472 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 36 [2019-11-06 18:47:18,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:18,472 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-11-06 18:47:18,472 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:47:18,473 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-11-06 18:47:18,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 18:47:18,473 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:18,474 INFO L410 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:18,676 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:18,677 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:18,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:18,678 INFO L82 PathProgramCache]: Analyzing trace with hash -120480511, now seen corresponding path program 3 times [2019-11-06 18:47:18,678 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:18,678 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497320850] [2019-11-06 18:47:18,678 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:18,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 2 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:18,760 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497320850] [2019-11-06 18:47:18,761 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262545986] [2019-11-06 18:47:18,761 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 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 [2019-11-06 18:47:18,810 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 18:47:18,811 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:18,812 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:47:18,814 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:19,054 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:47:19,055 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:19,055 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2019-11-06 18:47:19,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241794306] [2019-11-06 18:47:19,056 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:47:19,056 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:19,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:47:19,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:47:19,057 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 19 states. [2019-11-06 18:47:19,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:19,525 INFO L93 Difference]: Finished difference Result 95 states and 106 transitions. [2019-11-06 18:47:19,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:47:19,526 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 37 [2019-11-06 18:47:19,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:19,527 INFO L225 Difference]: With dead ends: 95 [2019-11-06 18:47:19,527 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 18:47:19,528 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=642, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:47:19,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 18:47:19,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 44. [2019-11-06 18:47:19,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:47:19,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2019-11-06 18:47:19,535 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2019-11-06 18:47:19,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:19,535 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2019-11-06 18:47:19,535 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:47:19,535 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2019-11-06 18:47:19,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:47:19,536 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:19,536 INFO L410 BasicCegarLoop]: trace histogram [8, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:19,744 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:19,745 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:19,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:19,746 INFO L82 PathProgramCache]: Analyzing trace with hash 437451791, now seen corresponding path program 1 times [2019-11-06 18:47:19,746 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:19,747 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674626212] [2019-11-06 18:47:19,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:19,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,857 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:19,858 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674626212] [2019-11-06 18:47:19,858 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493140431] [2019-11-06 18:47:19,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-06 18:47:19,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:19,909 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:47:19,911 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:19,928 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:19,928 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:19,929 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:47:19,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438543361] [2019-11-06 18:47:19,929 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:47:19,929 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:19,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:47:19,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:47:19,930 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 13 states. [2019-11-06 18:47:20,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:20,016 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2019-11-06 18:47:20,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:47:20,017 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 38 [2019-11-06 18:47:20,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:20,017 INFO L225 Difference]: With dead ends: 74 [2019-11-06 18:47:20,018 INFO L226 Difference]: Without dead ends: 45 [2019-11-06 18:47:20,018 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:47:20,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-06 18:47:20,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-11-06 18:47:20,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:47:20,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2019-11-06 18:47:20,024 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 38 [2019-11-06 18:47:20,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:20,025 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2019-11-06 18:47:20,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:47:20,025 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2019-11-06 18:47:20,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:47:20,026 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:20,026 INFO L410 BasicCegarLoop]: trace histogram [9, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:20,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:20,229 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:20,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:20,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1371132419, now seen corresponding path program 2 times [2019-11-06 18:47:20,230 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:20,230 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076538601] [2019-11-06 18:47:20,231 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:20,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,335 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 45 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:20,335 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076538601] [2019-11-06 18:47:20,335 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443935313] [2019-11-06 18:47:20,336 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 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 [2019-11-06 18:47:20,389 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:20,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:20,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 18:47:20,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:20,414 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:47:20,414 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:20,415 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-11-06 18:47:20,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133046236] [2019-11-06 18:47:20,415 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:47:20,416 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:20,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:47:20,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:20,416 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 14 states. [2019-11-06 18:47:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:20,475 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2019-11-06 18:47:20,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:47:20,475 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-11-06 18:47:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:20,476 INFO L225 Difference]: With dead ends: 75 [2019-11-06 18:47:20,476 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:47:20,477 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:47:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:47:20,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-06 18:47:20,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:47:20,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2019-11-06 18:47:20,484 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2019-11-06 18:47:20,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:20,485 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2019-11-06 18:47:20,485 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:47:20,485 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2019-11-06 18:47:20,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:47:20,486 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:20,486 INFO L410 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:20,689 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:20,690 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:20,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:20,690 INFO L82 PathProgramCache]: Analyzing trace with hash 250460815, now seen corresponding path program 3 times [2019-11-06 18:47:20,690 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:20,690 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938792473] [2019-11-06 18:47:20,691 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:20,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:20,845 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:47:20,845 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938792473] [2019-11-06 18:47:20,845 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074663562] [2019-11-06 18:47:20,845 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 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 [2019-11-06 18:47:20,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 18:47:20,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:20,889 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:47:20,891 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:20,919 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:47:20,931 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2019-11-06 18:47:20,932 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:20,932 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2019-11-06 18:47:20,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796339451] [2019-11-06 18:47:20,932 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:47:20,933 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:20,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:47:20,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:20,933 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 17 states. [2019-11-06 18:47:21,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:21,295 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2019-11-06 18:47:21,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:47:21,295 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2019-11-06 18:47:21,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:21,296 INFO L225 Difference]: With dead ends: 82 [2019-11-06 18:47:21,296 INFO L226 Difference]: Without dead ends: 53 [2019-11-06 18:47:21,297 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=262, Invalid=608, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:47:21,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-06 18:47:21,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 47. [2019-11-06 18:47:21,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 18:47:21,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-11-06 18:47:21,302 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 40 [2019-11-06 18:47:21,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:21,303 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-11-06 18:47:21,303 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:47:21,303 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-11-06 18:47:21,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:47:21,304 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:21,304 INFO L410 BasicCegarLoop]: trace histogram [11, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:21,510 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:21,510 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:21,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:21,511 INFO L82 PathProgramCache]: Analyzing trace with hash -2056854566, now seen corresponding path program 4 times [2019-11-06 18:47:21,512 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:21,512 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910423885] [2019-11-06 18:47:21,512 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:21,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:21,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:21,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:21,689 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 66 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:47:21,690 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910423885] [2019-11-06 18:47:21,690 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711585454] [2019-11-06 18:47:21,690 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 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 [2019-11-06 18:47:21,753 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:21,754 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:21,755 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:47:21,757 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:21,776 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:47:21,776 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:21,776 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:47:21,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775087860] [2019-11-06 18:47:21,777 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:47:21,777 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:21,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:47:21,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:47:21,778 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 16 states. [2019-11-06 18:47:21,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:21,916 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2019-11-06 18:47:21,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:47:21,917 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2019-11-06 18:47:21,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:21,917 INFO L225 Difference]: With dead ends: 77 [2019-11-06 18:47:21,918 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:47:21,918 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:47:21,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:47:21,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-06 18:47:21,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:47:21,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2019-11-06 18:47:21,924 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2019-11-06 18:47:21,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:21,924 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2019-11-06 18:47:21,924 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:47:21,925 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2019-11-06 18:47:21,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 18:47:21,925 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:21,925 INFO L410 BasicCegarLoop]: trace histogram [12, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:22,136 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:22,136 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:22,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:22,137 INFO L82 PathProgramCache]: Analyzing trace with hash -481660210, now seen corresponding path program 5 times [2019-11-06 18:47:22,137 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:22,137 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412310906] [2019-11-06 18:47:22,137 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:22,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:22,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:22,701 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:47:22,702 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412310906] [2019-11-06 18:47:22,702 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115867254] [2019-11-06 18:47:22,702 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 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 [2019-11-06 18:47:22,871 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:47:22,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:22,872 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:47:22,874 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:22,890 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:47:22,891 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:22,891 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 18:47:22,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423397145] [2019-11-06 18:47:22,891 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:47:22,892 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:22,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:47:22,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:22,892 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 17 states. [2019-11-06 18:47:22,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:22,989 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2019-11-06 18:47:22,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 18:47:22,990 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2019-11-06 18:47:22,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:22,991 INFO L225 Difference]: With dead ends: 78 [2019-11-06 18:47:22,991 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:47:22,992 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:47:22,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:47:22,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-11-06 18:47:22,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 18:47:22,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2019-11-06 18:47:22,999 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 45 [2019-11-06 18:47:22,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:22,999 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2019-11-06 18:47:22,999 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:47:22,999 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2019-11-06 18:47:23,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:47:23,000 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:23,000 INFO L410 BasicCegarLoop]: trace histogram [13, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:23,204 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:23,204 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:23,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:23,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1104724570, now seen corresponding path program 6 times [2019-11-06 18:47:23,205 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:23,205 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745560387] [2019-11-06 18:47:23,206 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:23,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:23,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:23,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:23,392 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 2 proven. 91 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:47:23,393 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745560387] [2019-11-06 18:47:23,393 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741612992] [2019-11-06 18:47:23,393 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 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 [2019-11-06 18:47:23,459 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-06 18:47:23,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:23,461 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-06 18:47:23,463 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:23,472 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-11-06 18:47:23,473 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:23,482 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:23,483 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:23,483 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-11-06 18:47:23,526 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2019-11-06 18:47:23,526 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:23,534 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:23,534 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:23,535 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:26 [2019-11-06 18:47:25,589 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_main_~#src~0.base_BEFORE_CALL_2| Int) (|v_main_~#dst~0.base_BEFORE_CALL_1| Int)) (and (= (select (select |c_#memory_int| |v_main_~#src~0.base_BEFORE_CALL_2|) 4) (select (select |c_#memory_int| |v_main_~#dst~0.base_BEFORE_CALL_1|) 4)) (not (= |v_main_~#src~0.base_BEFORE_CALL_2| |v_main_~#dst~0.base_BEFORE_CALL_1|)))) is different from true [2019-11-06 18:47:27,614 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 17 [2019-11-06 18:47:29,650 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 18 [2019-11-06 18:47:29,728 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2019-11-06 18:47:29,729 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:29,741 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:29,742 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:29,742 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2019-11-06 18:47:31,818 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 91 trivial. 1 not checked. [2019-11-06 18:47:31,818 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:31,818 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2019-11-06 18:47:31,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105470821] [2019-11-06 18:47:31,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 18:47:31,819 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:31,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 18:47:31,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=556, Unknown=2, NotChecked=50, Total=756 [2019-11-06 18:47:31,820 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 28 states. [2019-11-06 18:47:36,513 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 23 [2019-11-06 18:47:38,562 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 26 [2019-11-06 18:47:40,607 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 29 [2019-11-06 18:47:44,822 WARN L191 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2019-11-06 18:47:48,882 WARN L191 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2019-11-06 18:47:51,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:51,016 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2019-11-06 18:47:51,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:47:51,016 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 46 [2019-11-06 18:47:51,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:51,017 INFO L225 Difference]: With dead ends: 89 [2019-11-06 18:47:51,017 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 18:47:51,018 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=430, Invalid=1827, Unknown=3, NotChecked=92, Total=2352 [2019-11-06 18:47:51,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 18:47:51,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2019-11-06 18:47:51,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-11-06 18:47:51,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2019-11-06 18:47:51,024 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 46 [2019-11-06 18:47:51,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:51,024 INFO L462 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2019-11-06 18:47:51,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 18:47:51,025 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2019-11-06 18:47:51,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 18:47:51,025 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:51,026 INFO L410 BasicCegarLoop]: trace histogram [14, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:51,229 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:51,230 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:51,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:51,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1118319116, now seen corresponding path program 7 times [2019-11-06 18:47:51,231 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:51,231 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769387231] [2019-11-06 18:47:51,231 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:51,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,398 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 4 proven. 105 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 18:47:51,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769387231] [2019-11-06 18:47:51,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837545721] [2019-11-06 18:47:51,398 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:51,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:51,482 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:47:51,484 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:51,507 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:47:51,507 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:51,507 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:47:51,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732240804] [2019-11-06 18:47:51,509 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:47:51,509 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:51,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:47:51,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:47:51,510 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 19 states. [2019-11-06 18:47:51,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:51,643 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2019-11-06 18:47:51,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:47:51,643 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2019-11-06 18:47:51,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:51,644 INFO L225 Difference]: With dead ends: 98 [2019-11-06 18:47:51,644 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 18:47:51,646 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:47:51,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 18:47:51,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-11-06 18:47:51,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:47:51,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2019-11-06 18:47:51,657 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 56 [2019-11-06 18:47:51,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:51,658 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2019-11-06 18:47:51,658 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:47:51,658 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2019-11-06 18:47:51,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-06 18:47:51,662 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:51,662 INFO L410 BasicCegarLoop]: trace histogram [15, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:51,863 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:51,863 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:51,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:51,863 INFO L82 PathProgramCache]: Analyzing trace with hash -427232512, now seen corresponding path program 8 times [2019-11-06 18:47:51,864 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:51,864 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829394970] [2019-11-06 18:47:51,864 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:51,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,093 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 4 proven. 120 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 18:47:52,093 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829394970] [2019-11-06 18:47:52,094 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499592936] [2019-11-06 18:47:52,094 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:52,159 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:47:52,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:52,160 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 18:47:52,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:52,180 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:47:52,182 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:52,182 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:47:52,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711554965] [2019-11-06 18:47:52,183 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:47:52,183 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:52,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:47:52,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:47:52,183 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 20 states. [2019-11-06 18:47:52,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:52,283 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2019-11-06 18:47:52,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:47:52,283 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2019-11-06 18:47:52,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:52,284 INFO L225 Difference]: With dead ends: 99 [2019-11-06 18:47:52,284 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 18:47:52,285 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:47:52,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 18:47:52,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-11-06 18:47:52,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 18:47:52,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2019-11-06 18:47:52,291 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 57 [2019-11-06 18:47:52,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:52,291 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2019-11-06 18:47:52,291 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:47:52,291 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2019-11-06 18:47:52,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 18:47:52,292 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:52,292 INFO L410 BasicCegarLoop]: trace histogram [16, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:52,496 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:52,497 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:52,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:52,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1094692724, now seen corresponding path program 9 times [2019-11-06 18:47:52,497 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:52,498 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231080809] [2019-11-06 18:47:52,498 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:52,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:52,874 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 4 proven. 136 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 18:47:52,875 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231080809] [2019-11-06 18:47:52,875 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700775871] [2019-11-06 18:47:52,875 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:52,946 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:47:52,946 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:52,947 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:47:52,949 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:53,303 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:47:53,333 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2019-11-06 18:47:53,333 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:53,333 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 12] total 30 [2019-11-06 18:47:53,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135712025] [2019-11-06 18:47:53,334 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:47:53,334 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:53,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:47:53,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=667, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:47:53,335 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 30 states. [2019-11-06 18:47:54,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:54,536 INFO L93 Difference]: Finished difference Result 142 states and 154 transitions. [2019-11-06 18:47:54,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:47:54,541 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2019-11-06 18:47:54,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:54,542 INFO L225 Difference]: With dead ends: 142 [2019-11-06 18:47:54,542 INFO L226 Difference]: Without dead ends: 82 [2019-11-06 18:47:54,543 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=558, Invalid=1892, Unknown=0, NotChecked=0, Total=2450 [2019-11-06 18:47:54,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-11-06 18:47:54,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 65. [2019-11-06 18:47:54,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 18:47:54,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2019-11-06 18:47:54,550 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 58 [2019-11-06 18:47:54,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:54,550 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2019-11-06 18:47:54,550 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:47:54,550 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2019-11-06 18:47:54,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:47:54,551 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:54,551 INFO L410 BasicCegarLoop]: trace histogram [17, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:54,751 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:54,752 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:54,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:54,752 INFO L82 PathProgramCache]: Analyzing trace with hash -820595906, now seen corresponding path program 4 times [2019-11-06 18:47:54,753 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:54,753 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069079763] [2019-11-06 18:47:54,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:54,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:54,999 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 4 proven. 153 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-06 18:47:55,000 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069079763] [2019-11-06 18:47:55,000 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768922811] [2019-11-06 18:47:55,000 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:55,075 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:55,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:55,076 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:47:55,077 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:55,126 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:47:55,141 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2019-11-06 18:47:55,141 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:55,142 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 6] total 25 [2019-11-06 18:47:55,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721038263] [2019-11-06 18:47:55,142 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:47:55,143 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:55,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:47:55,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=397, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:47:55,143 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 25 states. [2019-11-06 18:47:55,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:55,657 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2019-11-06 18:47:55,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:47:55,658 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 59 [2019-11-06 18:47:55,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:55,659 INFO L225 Difference]: With dead ends: 113 [2019-11-06 18:47:55,659 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 18:47:55,661 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=635, Invalid=1435, Unknown=0, NotChecked=0, Total=2070 [2019-11-06 18:47:55,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 18:47:55,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2019-11-06 18:47:55,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-06 18:47:55,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 69 transitions. [2019-11-06 18:47:55,666 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 69 transitions. Word has length 59 [2019-11-06 18:47:55,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:55,666 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 69 transitions. [2019-11-06 18:47:55,666 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:47:55,666 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 69 transitions. [2019-11-06 18:47:55,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 18:47:55,667 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:55,667 INFO L410 BasicCegarLoop]: trace histogram [18, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:55,871 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:55,871 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:55,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:55,872 INFO L82 PathProgramCache]: Analyzing trace with hash 934276045, now seen corresponding path program 10 times [2019-11-06 18:47:55,872 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:55,872 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981209557] [2019-11-06 18:47:55,872 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:55,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,119 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 4 proven. 171 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-06 18:47:56,119 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981209557] [2019-11-06 18:47:56,119 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50431386] [2019-11-06 18:47:56,119 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:56,204 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:47:56,204 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:56,205 INFO L256 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:47:56,206 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:56,219 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-11-06 18:47:56,219 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:56,219 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 18:47:56,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317919756] [2019-11-06 18:47:56,220 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:47:56,220 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:56,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:47:56,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:47:56,221 INFO L87 Difference]: Start difference. First operand 66 states and 69 transitions. Second operand 23 states. [2019-11-06 18:47:56,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:56,284 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2019-11-06 18:47:56,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:47:56,287 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2019-11-06 18:47:56,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:56,288 INFO L225 Difference]: With dead ends: 108 [2019-11-06 18:47:56,288 INFO L226 Difference]: Without dead ends: 67 [2019-11-06 18:47:56,288 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:47:56,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-06 18:47:56,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-11-06 18:47:56,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 18:47:56,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-11-06 18:47:56,293 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 63 [2019-11-06 18:47:56,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:56,294 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-11-06 18:47:56,294 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:47:56,294 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-11-06 18:47:56,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-06 18:47:56,295 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:56,295 INFO L410 BasicCegarLoop]: trace histogram [19, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:56,499 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:56,499 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:56,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:56,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1544941657, now seen corresponding path program 11 times [2019-11-06 18:47:56,500 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:56,500 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726036114] [2019-11-06 18:47:56,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:56,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:56,729 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 4 proven. 190 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-06 18:47:56,730 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726036114] [2019-11-06 18:47:56,730 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807358347] [2019-11-06 18:47:56,730 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:57,154 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-11-06 18:47:57,155 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:57,158 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:47:57,159 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-11-06 18:47:57,172 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:47:57,172 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:47:57,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495910292] [2019-11-06 18:47:57,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:47:57,173 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:47:57,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:47:57,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:47:57,174 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2019-11-06 18:47:57,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:47:57,316 INFO L93 Difference]: Finished difference Result 109 states and 115 transitions. [2019-11-06 18:47:57,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:47:57,317 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 64 [2019-11-06 18:47:57,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:47:57,318 INFO L225 Difference]: With dead ends: 109 [2019-11-06 18:47:57,318 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 18:47:57,319 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:47:57,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 18:47:57,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-11-06 18:47:57,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-06 18:47:57,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2019-11-06 18:47:57,325 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 64 [2019-11-06 18:47:57,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:47:57,325 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2019-11-06 18:47:57,325 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:47:57,325 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2019-11-06 18:47:57,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:47:57,326 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:47:57,326 INFO L410 BasicCegarLoop]: trace histogram [20, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:47:57,531 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:57,531 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:47:57,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:47:57,531 INFO L82 PathProgramCache]: Analyzing trace with hash -999260851, now seen corresponding path program 12 times [2019-11-06 18:47:57,532 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:47:57,532 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684444057] [2019-11-06 18:47:57,532 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:47:57,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:57,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:57,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:57,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:47:57,775 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 4 proven. 210 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-06 18:47:57,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684444057] [2019-11-06 18:47:57,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258008673] [2019-11-06 18:47:57,775 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:47:58,022 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:47:58,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:47:58,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 38 conjunts are in the unsatisfiable core [2019-11-06 18:47:58,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:47:58,031 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-11-06 18:47:58,031 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:58,036 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:58,036 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:58,037 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-11-06 18:47:58,113 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2019-11-06 18:47:58,113 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:47:58,120 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:47:58,121 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:47:58,121 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:26 [2019-11-06 18:48:00,195 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_main_~#src~0.base_BEFORE_CALL_5| Int) (|v_main_~#dst~0.base_BEFORE_CALL_2| Int)) (and (not (= |v_main_~#src~0.base_BEFORE_CALL_5| |v_main_~#dst~0.base_BEFORE_CALL_2|)) (= (select (select |c_#memory_int| |v_main_~#src~0.base_BEFORE_CALL_5|) 8) (select (select |c_#memory_int| |v_main_~#dst~0.base_BEFORE_CALL_2|) 8)))) is different from true [2019-11-06 18:48:02,278 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_main_~#src~0.base_BEFORE_CALL_6| Int) (|v_main_~#dst~0.base_BEFORE_CALL_3| Int)) (and (= (select (select |c_#memory_int| |v_main_~#dst~0.base_BEFORE_CALL_3|) 8) (select (select |c_#memory_int| |v_main_~#src~0.base_BEFORE_CALL_6|) 8)) (not (= |v_main_~#src~0.base_BEFORE_CALL_6| |v_main_~#dst~0.base_BEFORE_CALL_3|)))) is different from true