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_compareModified_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:43:38,002 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:43:38,006 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:43:38,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:43:38,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:43:38,028 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:43:38,030 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:43:38,044 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:43:38,046 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:43:38,048 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:43:38,050 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:43:38,052 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:43:38,052 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:43:38,056 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:43:38,059 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:43:38,061 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:43:38,062 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:43:38,065 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:43:38,066 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:43:38,068 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:43:38,070 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:43:38,071 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:43:38,072 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:43:38,073 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:43:38,075 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:43:38,075 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:43:38,076 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:43:38,077 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:43:38,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:43:38,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:43:38,078 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:43:38,079 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:43:38,080 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:43:38,081 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:43:38,082 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:43:38,082 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:43:38,083 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:43:38,083 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:43:38,083 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:43:38,084 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:43:38,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:43:38,090 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 17:43:38,104 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:43:38,104 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:43:38,105 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:43:38,106 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:43:38,106 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:43:38,106 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:43:38,106 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:43:38,106 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:43:38,107 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:43:38,107 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:43:38,107 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:43:38,107 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:43:38,108 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:43:38,108 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:43:38,108 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:43:38,108 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:43:38,108 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:43:38,109 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:43:38,109 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:43:38,109 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:43:38,109 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:43:38,109 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:43:38,109 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:43:38,110 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:43:38,381 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:43:38,394 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:43:38,397 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:43:38,398 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:43:38,398 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:43:38,399 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_compareModified_ground.i [2019-10-13 17:43:38,454 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93276e5d4/696c32b54e234e4ab812f6fa9f44ccd6/FLAGbce7a8785 [2019-10-13 17:43:38,898 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:43:38,899 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_compareModified_ground.i [2019-10-13 17:43:38,905 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93276e5d4/696c32b54e234e4ab812f6fa9f44ccd6/FLAGbce7a8785 [2019-10-13 17:43:39,284 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/93276e5d4/696c32b54e234e4ab812f6fa9f44ccd6 [2019-10-13 17:43:39,294 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:43:39,295 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:43:39,297 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:39,297 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:43:39,303 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:43:39,304 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@287e3a05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39, skipping insertion in model container [2019-10-13 17:43:39,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,315 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:43:39,334 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:43:39,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:39,570 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:43:39,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:39,611 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:43:39,612 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39 WrapperNode [2019-10-13 17:43:39,612 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:39,612 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:43:39,613 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:43:39,613 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:43:39,707 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,708 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,718 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,720 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,736 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,742 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,744 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... [2019-10-13 17:43:39,746 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:43:39,747 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:43:39,747 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:43:39,747 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:43:39,748 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:43:39,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:43:39,807 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:43:39,807 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:43:39,807 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:43:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:43:39,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:43:39,809 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:43:39,809 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:43:40,133 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:43:40,134 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-13 17:43:40,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:40 BoogieIcfgContainer [2019-10-13 17:43:40,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:43:40,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:43:40,136 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:43:40,139 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:43:40,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:43:39" (1/3) ... [2019-10-13 17:43:40,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69b2e1b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:40, skipping insertion in model container [2019-10-13 17:43:40,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:39" (2/3) ... [2019-10-13 17:43:40,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69b2e1b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:40, skipping insertion in model container [2019-10-13 17:43:40,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:40" (3/3) ... [2019-10-13 17:43:40,143 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_compareModified_ground.i [2019-10-13 17:43:40,152 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:43:40,160 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:43:40,171 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:43:40,197 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:43:40,198 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:43:40,198 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:43:40,198 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:43:40,198 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:43:40,198 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:43:40,198 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:43:40,199 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:43:40,215 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2019-10-13 17:43:40,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:43:40,220 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,221 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,223 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1992705634, now seen corresponding path program 1 times [2019-10-13 17:43:40,234 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,235 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643774575] [2019-10-13 17:43:40,235 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,235 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,235 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:40,419 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643774575] [2019-10-13 17:43:40,420 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:40,421 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:43:40,421 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465423128] [2019-10-13 17:43:40,426 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:43:40,427 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:43:40,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:40,445 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 3 states. [2019-10-13 17:43:40,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,567 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2019-10-13 17:43:40,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:43:40,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-13 17:43:40,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,578 INFO L225 Difference]: With dead ends: 58 [2019-10-13 17:43:40,578 INFO L226 Difference]: Without dead ends: 28 [2019-10-13 17:43:40,582 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:40,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-13 17:43:40,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-13 17:43:40,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-13 17:43:40,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2019-10-13 17:43:40,624 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 15 [2019-10-13 17:43:40,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,624 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2019-10-13 17:43:40,624 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:43:40,624 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2019-10-13 17:43:40,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 17:43:40,626 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,626 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,626 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,627 INFO L82 PathProgramCache]: Analyzing trace with hash -2038513977, now seen corresponding path program 1 times [2019-10-13 17:43:40,627 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,627 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018921890] [2019-10-13 17:43:40,628 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,628 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:40,713 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018921890] [2019-10-13 17:43:40,713 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:40,714 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:40,714 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991891759] [2019-10-13 17:43:40,715 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:40,716 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:40,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:40,717 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 4 states. [2019-10-13 17:43:40,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,819 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2019-10-13 17:43:40,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:40,819 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-13 17:43:40,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,821 INFO L225 Difference]: With dead ends: 50 [2019-10-13 17:43:40,821 INFO L226 Difference]: Without dead ends: 30 [2019-10-13 17:43:40,822 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:40,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-13 17:43:40,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-10-13 17:43:40,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-13 17:43:40,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2019-10-13 17:43:40,831 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 15 [2019-10-13 17:43:40,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,831 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2019-10-13 17:43:40,831 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:40,832 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2019-10-13 17:43:40,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 17:43:40,833 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,833 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,833 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1204074085, now seen corresponding path program 1 times [2019-10-13 17:43:40,834 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,834 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451269369] [2019-10-13 17:43:40,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:40,922 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451269369] [2019-10-13 17:43:40,922 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:40,925 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:40,925 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857131854] [2019-10-13 17:43:40,926 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:40,926 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:40,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:40,927 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 4 states. [2019-10-13 17:43:41,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,026 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2019-10-13 17:43:41,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:41,028 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-13 17:43:41,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,029 INFO L225 Difference]: With dead ends: 49 [2019-10-13 17:43:41,030 INFO L226 Difference]: Without dead ends: 32 [2019-10-13 17:43:41,030 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:41,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-13 17:43:41,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-10-13 17:43:41,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-13 17:43:41,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2019-10-13 17:43:41,044 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2019-10-13 17:43:41,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,044 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2019-10-13 17:43:41,044 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:41,045 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2019-10-13 17:43:41,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:43:41,047 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,048 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,048 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,049 INFO L82 PathProgramCache]: Analyzing trace with hash -489632055, now seen corresponding path program 1 times [2019-10-13 17:43:41,049 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,049 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500893935] [2019-10-13 17:43:41,050 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,050 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,051 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,160 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500893935] [2019-10-13 17:43:41,161 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:41,161 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:41,161 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899893751] [2019-10-13 17:43:41,162 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:41,162 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:41,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:41,163 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 4 states. [2019-10-13 17:43:41,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,278 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2019-10-13 17:43:41,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:41,280 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-13 17:43:41,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,281 INFO L225 Difference]: With dead ends: 55 [2019-10-13 17:43:41,281 INFO L226 Difference]: Without dead ends: 40 [2019-10-13 17:43:41,282 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:41,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-13 17:43:41,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2019-10-13 17:43:41,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-13 17:43:41,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2019-10-13 17:43:41,294 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 20 [2019-10-13 17:43:41,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,295 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2019-10-13 17:43:41,295 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:41,295 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2019-10-13 17:43:41,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:43:41,296 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,296 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,297 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,297 INFO L82 PathProgramCache]: Analyzing trace with hash -882659065, now seen corresponding path program 1 times [2019-10-13 17:43:41,297 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,297 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601057819] [2019-10-13 17:43:41,298 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,298 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,298 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601057819] [2019-10-13 17:43:41,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790846208] [2019-10-13 17:43:41,384 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,458 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,492 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:41,493 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:43:41,493 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211758765] [2019-10-13 17:43:41,493 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:43:41,494 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:43:41,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:41,495 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 6 states. [2019-10-13 17:43:41,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,579 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2019-10-13 17:43:41,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:43:41,580 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-13 17:43:41,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,581 INFO L225 Difference]: With dead ends: 64 [2019-10-13 17:43:41,581 INFO L226 Difference]: Without dead ends: 38 [2019-10-13 17:43:41,582 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:41,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-13 17:43:41,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2019-10-13 17:43:41,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-13 17:43:41,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2019-10-13 17:43:41,588 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 20 [2019-10-13 17:43:41,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,588 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2019-10-13 17:43:41,589 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:43:41,589 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2019-10-13 17:43:41,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-13 17:43:41,590 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,590 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,795 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,795 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1747071959, now seen corresponding path program 2 times [2019-10-13 17:43:41,796 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,797 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630629826] [2019-10-13 17:43:41,797 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,797 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,797 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:43:41,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630629826] [2019-10-13 17:43:41,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389707825] [2019-10-13 17:43:41,865 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:41,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:41,914 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,916 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,943 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,943 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:41,944 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-10-13 17:43:41,944 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250375145] [2019-10-13 17:43:41,944 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:43:41,944 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:43:41,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:41,945 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 8 states. [2019-10-13 17:43:42,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,072 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2019-10-13 17:43:42,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:43:42,072 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2019-10-13 17:43:42,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,073 INFO L225 Difference]: With dead ends: 75 [2019-10-13 17:43:42,074 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:43:42,076 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:43:42,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:43:42,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2019-10-13 17:43:42,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-13 17:43:42,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2019-10-13 17:43:42,094 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 22 [2019-10-13 17:43:42,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,095 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2019-10-13 17:43:42,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:43:42,095 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2019-10-13 17:43:42,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:43:42,096 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,096 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:42,301 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,302 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:42,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:42,302 INFO L82 PathProgramCache]: Analyzing trace with hash 523443937, now seen corresponding path program 3 times [2019-10-13 17:43:42,303 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:42,303 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120307129] [2019-10-13 17:43:42,303 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,303 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,303 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:42,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,384 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:43:42,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120307129] [2019-10-13 17:43:42,385 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1346969775] [2019-10-13 17:43:42,385 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:43:42,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:42,436 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:43:42,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:42,457 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:43:42,458 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:42,458 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:43:42,458 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189336544] [2019-10-13 17:43:42,459 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:43:42,459 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:42,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:43:42,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:42,460 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand 7 states. [2019-10-13 17:43:42,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,559 INFO L93 Difference]: Finished difference Result 73 states and 91 transitions. [2019-10-13 17:43:42,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:43:42,560 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-13 17:43:42,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,561 INFO L225 Difference]: With dead ends: 73 [2019-10-13 17:43:42,561 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:43:42,562 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:42,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:43:42,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2019-10-13 17:43:42,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-13 17:43:42,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 61 transitions. [2019-10-13 17:43:42,569 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 61 transitions. Word has length 27 [2019-10-13 17:43:42,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,570 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 61 transitions. [2019-10-13 17:43:42,570 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:43:42,570 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 61 transitions. [2019-10-13 17:43:42,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-13 17:43:42,571 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,571 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:42,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,775 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:42,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:42,775 INFO L82 PathProgramCache]: Analyzing trace with hash -994793717, now seen corresponding path program 4 times [2019-10-13 17:43:42,775 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:42,776 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071076593] [2019-10-13 17:43:42,776 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,777 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,777 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:42,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,895 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-13 17:43:42,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071076593] [2019-10-13 17:43:42,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755277003] [2019-10-13 17:43:42,896 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,949 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:42,949 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:42,950 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:43:42,952 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:42,983 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-13 17:43:42,983 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:42,983 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:43:42,984 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252254827] [2019-10-13 17:43:42,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:43:42,984 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:42,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:43:42,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:42,985 INFO L87 Difference]: Start difference. First operand 50 states and 61 transitions. Second operand 8 states. [2019-10-13 17:43:43,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:43,069 INFO L93 Difference]: Finished difference Result 90 states and 112 transitions. [2019-10-13 17:43:43,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:43:43,070 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2019-10-13 17:43:43,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:43,071 INFO L225 Difference]: With dead ends: 90 [2019-10-13 17:43:43,071 INFO L226 Difference]: Without dead ends: 53 [2019-10-13 17:43:43,072 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:43,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-13 17:43:43,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-10-13 17:43:43,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 17:43:43,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 63 transitions. [2019-10-13 17:43:43,078 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 63 transitions. Word has length 30 [2019-10-13 17:43:43,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:43,079 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 63 transitions. [2019-10-13 17:43:43,079 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:43:43,079 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 63 transitions. [2019-10-13 17:43:43,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-13 17:43:43,080 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:43,080 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,290 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,291 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1511473235, now seen corresponding path program 5 times [2019-10-13 17:43:43,292 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,292 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628827192] [2019-10-13 17:43:43,293 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,293 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,293 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,417 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:43:43,417 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628827192] [2019-10-13 17:43:43,417 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110701819] [2019-10-13 17:43:43,418 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,558 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-10-13 17:43:43,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:43,559 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:43:43,561 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:43,572 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:43:43,572 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:43,572 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:43:43,572 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933839411] [2019-10-13 17:43:43,573 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:43:43,573 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:43,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:43:43,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:43,574 INFO L87 Difference]: Start difference. First operand 52 states and 63 transitions. Second operand 8 states. [2019-10-13 17:43:43,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:43,658 INFO L93 Difference]: Finished difference Result 81 states and 101 transitions. [2019-10-13 17:43:43,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:43:43,659 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2019-10-13 17:43:43,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:43,660 INFO L225 Difference]: With dead ends: 81 [2019-10-13 17:43:43,660 INFO L226 Difference]: Without dead ends: 62 [2019-10-13 17:43:43,661 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:43,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-13 17:43:43,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2019-10-13 17:43:43,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-13 17:43:43,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 71 transitions. [2019-10-13 17:43:43,667 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 71 transitions. Word has length 32 [2019-10-13 17:43:43,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:43,668 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 71 transitions. [2019-10-13 17:43:43,668 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:43:43,668 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 71 transitions. [2019-10-13 17:43:43,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-13 17:43:43,669 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:43,669 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,873 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,874 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,875 INFO L82 PathProgramCache]: Analyzing trace with hash 251118271, now seen corresponding path program 6 times [2019-10-13 17:43:43,875 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,875 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252386405] [2019-10-13 17:43:43,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,876 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,024 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 17:43:44,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252386405] [2019-10-13 17:43:44,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072974163] [2019-10-13 17:43:44,025 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,111 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-13 17:43:44,111 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:44,112 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:43:44,114 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:44,166 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-13 17:43:44,166 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:44,166 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2019-10-13 17:43:44,166 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955465978] [2019-10-13 17:43:44,167 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:43:44,167 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:44,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:43:44,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:43:44,168 INFO L87 Difference]: Start difference. First operand 58 states and 71 transitions. Second operand 13 states. [2019-10-13 17:43:44,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:44,315 INFO L93 Difference]: Finished difference Result 114 states and 146 transitions. [2019-10-13 17:43:44,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:43:44,315 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2019-10-13 17:43:44,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:44,316 INFO L225 Difference]: With dead ends: 114 [2019-10-13 17:43:44,316 INFO L226 Difference]: Without dead ends: 71 [2019-10-13 17:43:44,317 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=103, Invalid=203, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:44,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-10-13 17:43:44,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 66. [2019-10-13 17:43:44,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-10-13 17:43:44,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 81 transitions. [2019-10-13 17:43:44,324 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 81 transitions. Word has length 35 [2019-10-13 17:43:44,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:44,324 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 81 transitions. [2019-10-13 17:43:44,324 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:43:44,324 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 81 transitions. [2019-10-13 17:43:44,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-13 17:43:44,326 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:44,326 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:44,538 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,538 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:44,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:44,539 INFO L82 PathProgramCache]: Analyzing trace with hash -2082970353, now seen corresponding path program 7 times [2019-10-13 17:43:44,539 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:44,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232668358] [2019-10-13 17:43:44,540 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,540 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:44,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,681 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:43:44,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232668358] [2019-10-13 17:43:44,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470694517] [2019-10-13 17:43:44,683 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,739 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:43:44,741 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:44,798 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-10-13 17:43:44,799 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:44,799 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2019-10-13 17:43:44,799 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820498325] [2019-10-13 17:43:44,799 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:43:44,800 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:44,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:43:44,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:43:44,800 INFO L87 Difference]: Start difference. First operand 66 states and 81 transitions. Second operand 15 states. [2019-10-13 17:43:44,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:44,968 INFO L93 Difference]: Finished difference Result 128 states and 164 transitions. [2019-10-13 17:43:44,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:43:44,969 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2019-10-13 17:43:44,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:44,970 INFO L225 Difference]: With dead ends: 128 [2019-10-13 17:43:44,970 INFO L226 Difference]: Without dead ends: 79 [2019-10-13 17:43:44,971 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=141, Invalid=279, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:43:44,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-13 17:43:44,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 74. [2019-10-13 17:43:44,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-13 17:43:44,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 91 transitions. [2019-10-13 17:43:44,977 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 91 transitions. Word has length 40 [2019-10-13 17:43:44,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:44,977 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 91 transitions. [2019-10-13 17:43:44,977 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:43:44,978 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 91 transitions. [2019-10-13 17:43:44,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-13 17:43:44,979 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:44,979 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:45,187 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,188 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:45,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:45,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1851984059, now seen corresponding path program 8 times [2019-10-13 17:43:45,188 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:45,188 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55028252] [2019-10-13 17:43:45,188 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,189 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,189 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:45,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,288 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:43:45,288 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55028252] [2019-10-13 17:43:45,288 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650543388] [2019-10-13 17:43:45,289 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,352 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:45,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:45,353 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:43:45,356 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:45,447 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-13 17:43:45,448 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:45,448 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2019-10-13 17:43:45,448 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902853923] [2019-10-13 17:43:45,449 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:43:45,449 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:45,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:43:45,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:43:45,450 INFO L87 Difference]: Start difference. First operand 74 states and 91 transitions. Second operand 17 states. [2019-10-13 17:43:45,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:45,685 INFO L93 Difference]: Finished difference Result 142 states and 182 transitions. [2019-10-13 17:43:45,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:43:45,685 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2019-10-13 17:43:45,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:45,686 INFO L225 Difference]: With dead ends: 142 [2019-10-13 17:43:45,686 INFO L226 Difference]: Without dead ends: 87 [2019-10-13 17:43:45,687 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=185, Invalid=367, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:43:45,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-10-13 17:43:45,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 82. [2019-10-13 17:43:45,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-13 17:43:45,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 101 transitions. [2019-10-13 17:43:45,699 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 101 transitions. Word has length 45 [2019-10-13 17:43:45,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:45,699 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 101 transitions. [2019-10-13 17:43:45,699 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:43:45,699 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 101 transitions. [2019-10-13 17:43:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-13 17:43:45,700 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:45,701 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:45,905 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,905 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:45,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:45,906 INFO L82 PathProgramCache]: Analyzing trace with hash 2023959315, now seen corresponding path program 9 times [2019-10-13 17:43:45,906 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:45,906 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266836809] [2019-10-13 17:43:45,906 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,906 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,906 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:45,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,025 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-13 17:43:46,026 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266836809] [2019-10-13 17:43:46,026 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891027688] [2019-10-13 17:43:46,026 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:46,678 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-10-13 17:43:46,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:46,680 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-13 17:43:46,684 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:46,814 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-10-13 17:43:46,815 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:46,815 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2019-10-13 17:43:46,815 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516609140] [2019-10-13 17:43:46,816 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:43:46,816 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:46,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:43:46,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:43:46,817 INFO L87 Difference]: Start difference. First operand 82 states and 101 transitions. Second operand 19 states. [2019-10-13 17:43:47,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:47,043 INFO L93 Difference]: Finished difference Result 156 states and 200 transitions. [2019-10-13 17:43:47,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:43:47,044 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 50 [2019-10-13 17:43:47,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:47,045 INFO L225 Difference]: With dead ends: 156 [2019-10-13 17:43:47,045 INFO L226 Difference]: Without dead ends: 95 [2019-10-13 17:43:47,047 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=235, Invalid=467, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:47,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2019-10-13 17:43:47,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 90. [2019-10-13 17:43:47,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-13 17:43:47,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 111 transitions. [2019-10-13 17:43:47,053 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 111 transitions. Word has length 50 [2019-10-13 17:43:47,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:47,054 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 111 transitions. [2019-10-13 17:43:47,054 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:43:47,054 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 111 transitions. [2019-10-13 17:43:47,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-13 17:43:47,055 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:47,055 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:47,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,263 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:47,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:47,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1568482999, now seen corresponding path program 10 times [2019-10-13 17:43:47,264 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:47,264 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622022399] [2019-10-13 17:43:47,264 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,264 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,264 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:47,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,378 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 17:43:47,378 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622022399] [2019-10-13 17:43:47,378 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728100224] [2019-10-13 17:43:47,378 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,452 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:47,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:47,453 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:43:47,456 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:47,588 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-10-13 17:43:47,588 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:47,589 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2019-10-13 17:43:47,589 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377287563] [2019-10-13 17:43:47,589 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:43:47,590 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:47,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:43:47,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:43:47,591 INFO L87 Difference]: Start difference. First operand 90 states and 111 transitions. Second operand 21 states. [2019-10-13 17:43:47,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:47,831 INFO L93 Difference]: Finished difference Result 170 states and 218 transitions. [2019-10-13 17:43:47,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 17:43:47,831 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2019-10-13 17:43:47,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:47,832 INFO L225 Difference]: With dead ends: 170 [2019-10-13 17:43:47,833 INFO L226 Difference]: Without dead ends: 103 [2019-10-13 17:43:47,834 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=291, Invalid=579, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:43:47,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-10-13 17:43:47,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 98. [2019-10-13 17:43:47,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2019-10-13 17:43:47,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 121 transitions. [2019-10-13 17:43:47,839 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 121 transitions. Word has length 55 [2019-10-13 17:43:47,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:47,840 INFO L462 AbstractCegarLoop]: Abstraction has 98 states and 121 transitions. [2019-10-13 17:43:47,840 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:43:47,840 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 121 transitions. [2019-10-13 17:43:47,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-10-13 17:43:47,841 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:47,841 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:48,051 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:48,052 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:48,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:48,052 INFO L82 PathProgramCache]: Analyzing trace with hash -622249705, now seen corresponding path program 11 times [2019-10-13 17:43:48,053 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:48,053 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617617520] [2019-10-13 17:43:48,053 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,053 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,054 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:48,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,190 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:43:48,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617617520] [2019-10-13 17:43:48,190 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488729387] [2019-10-13 17:43:48,190 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:52,950 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-10-13 17:43:52,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:52,957 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:43:52,965 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:52,982 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:43:52,982 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:52,982 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-13 17:43:52,982 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383815743] [2019-10-13 17:43:52,983 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:43:52,983 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:52,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:43:52,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:52,984 INFO L87 Difference]: Start difference. First operand 98 states and 121 transitions. Second operand 14 states. [2019-10-13 17:43:53,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:53,105 INFO L93 Difference]: Finished difference Result 127 states and 159 transitions. [2019-10-13 17:43:53,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:43:53,106 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 60 [2019-10-13 17:43:53,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:53,109 INFO L225 Difference]: With dead ends: 127 [2019-10-13 17:43:53,109 INFO L226 Difference]: Without dead ends: 108 [2019-10-13 17:43:53,110 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:53,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-10-13 17:43:53,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2019-10-13 17:43:53,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-10-13 17:43:53,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 129 transitions. [2019-10-13 17:43:53,115 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 129 transitions. Word has length 60 [2019-10-13 17:43:53,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:53,115 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 129 transitions. [2019-10-13 17:43:53,115 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:43:53,116 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 129 transitions. [2019-10-13 17:43:53,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-13 17:43:53,116 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:53,116 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:53,330 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:53,330 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:53,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:53,331 INFO L82 PathProgramCache]: Analyzing trace with hash -248981227, now seen corresponding path program 12 times [2019-10-13 17:43:53,331 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:53,331 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104357897] [2019-10-13 17:43:53,331 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,332 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,332 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:53,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:53,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:53,502 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:43:53,502 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104357897] [2019-10-13 17:43:53,502 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653964347] [2019-10-13 17:43:53,502 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,249 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-10-13 17:43:56,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:56,253 INFO L256 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:43:56,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:56,401 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2019-10-13 17:43:56,401 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:56,402 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 24 [2019-10-13 17:43:56,402 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947997625] [2019-10-13 17:43:56,402 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-13 17:43:56,402 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:56,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-13 17:43:56,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=407, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:43:56,403 INFO L87 Difference]: Start difference. First operand 104 states and 129 transitions. Second operand 24 states. [2019-10-13 17:43:56,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:56,655 INFO L93 Difference]: Finished difference Result 196 states and 252 transitions. [2019-10-13 17:43:56,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-13 17:43:56,656 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 63 [2019-10-13 17:43:56,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:56,657 INFO L225 Difference]: With dead ends: 196 [2019-10-13 17:43:56,657 INFO L226 Difference]: Without dead ends: 117 [2019-10-13 17:43:56,658 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=375, Invalid=747, Unknown=0, NotChecked=0, Total=1122 [2019-10-13 17:43:56,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2019-10-13 17:43:56,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 112. [2019-10-13 17:43:56,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-10-13 17:43:56,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 139 transitions. [2019-10-13 17:43:56,665 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 139 transitions. Word has length 63 [2019-10-13 17:43:56,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:56,666 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 139 transitions. [2019-10-13 17:43:56,666 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-13 17:43:56,666 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 139 transitions. [2019-10-13 17:43:56,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-10-13 17:43:56,667 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:56,667 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:56,873 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,874 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:56,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:56,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1971306503, now seen corresponding path program 13 times [2019-10-13 17:43:56,874 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:56,874 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807915158] [2019-10-13 17:43:56,875 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,875 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,875 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:56,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,032 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-13 17:43:57,035 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807915158] [2019-10-13 17:43:57,035 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436479359] [2019-10-13 17:43:57,035 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:57,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,117 INFO L256 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:43:57,119 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:57,281 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2019-10-13 17:43:57,282 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:57,282 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2019-10-13 17:43:57,282 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434965193] [2019-10-13 17:43:57,282 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-13 17:43:57,283 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:57,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-13 17:43:57,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=480, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:43:57,284 INFO L87 Difference]: Start difference. First operand 112 states and 139 transitions. Second operand 26 states. [2019-10-13 17:43:57,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:57,593 INFO L93 Difference]: Finished difference Result 210 states and 270 transitions. [2019-10-13 17:43:57,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-13 17:43:57,594 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 68 [2019-10-13 17:43:57,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:57,595 INFO L225 Difference]: With dead ends: 210 [2019-10-13 17:43:57,595 INFO L226 Difference]: Without dead ends: 125 [2019-10-13 17:43:57,597 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=445, Invalid=887, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 17:43:57,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-10-13 17:43:57,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2019-10-13 17:43:57,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-10-13 17:43:57,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 149 transitions. [2019-10-13 17:43:57,603 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 149 transitions. Word has length 68 [2019-10-13 17:43:57,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:57,603 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 149 transitions. [2019-10-13 17:43:57,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-13 17:43:57,603 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 149 transitions. [2019-10-13 17:43:57,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-13 17:43:57,604 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:57,604 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:57,807 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:57,808 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:57,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:57,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1113238383, now seen corresponding path program 14 times [2019-10-13 17:43:57,809 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:57,809 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596734035] [2019-10-13 17:43:57,809 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:57,809 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:57,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:57,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:58,006 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-13 17:43:58,007 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596734035] [2019-10-13 17:43:58,007 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613391668] [2019-10-13 17:43:58,007 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:58,101 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:58,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:58,103 INFO L256 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:43:58,105 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:58,407 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-13 17:43:58,408 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:58,408 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 28 [2019-10-13 17:43:58,408 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78200865] [2019-10-13 17:43:58,409 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-13 17:43:58,409 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:58,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-13 17:43:58,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=559, Unknown=0, NotChecked=0, Total=756 [2019-10-13 17:43:58,411 INFO L87 Difference]: Start difference. First operand 120 states and 149 transitions. Second operand 28 states. [2019-10-13 17:43:58,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:58,785 INFO L93 Difference]: Finished difference Result 224 states and 288 transitions. [2019-10-13 17:43:58,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-13 17:43:58,785 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 73 [2019-10-13 17:43:58,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:58,786 INFO L225 Difference]: With dead ends: 224 [2019-10-13 17:43:58,787 INFO L226 Difference]: Without dead ends: 133 [2019-10-13 17:43:58,787 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=521, Invalid=1039, Unknown=0, NotChecked=0, Total=1560 [2019-10-13 17:43:58,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2019-10-13 17:43:58,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 128. [2019-10-13 17:43:58,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-10-13 17:43:58,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 159 transitions. [2019-10-13 17:43:58,792 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 159 transitions. Word has length 73 [2019-10-13 17:43:58,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:58,793 INFO L462 AbstractCegarLoop]: Abstraction has 128 states and 159 transitions. [2019-10-13 17:43:58,793 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-13 17:43:58,793 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 159 transitions. [2019-10-13 17:43:58,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-10-13 17:43:58,794 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:58,794 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:58,997 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:58,998 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:58,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:58,998 INFO L82 PathProgramCache]: Analyzing trace with hash 41984125, now seen corresponding path program 15 times [2019-10-13 17:43:58,999 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:58,999 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980752866] [2019-10-13 17:43:58,999 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:59,000 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:59,000 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:59,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:59,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:59,196 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 0 proven. 247 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 17:43:59,197 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980752866] [2019-10-13 17:43:59,197 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357184445] [2019-10-13 17:43:59,197 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 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 [2019-10-13 17:44:12,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2019-10-13 17:44:12,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:12,224 INFO L256 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-13 17:44:12,226 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:12,426 INFO L134 CoverageAnalysis]: Checked inductivity of 391 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2019-10-13 17:44:12,426 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:12,426 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 30 [2019-10-13 17:44:12,426 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555318688] [2019-10-13 17:44:12,427 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-13 17:44:12,427 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:12,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-13 17:44:12,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=644, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:44:12,428 INFO L87 Difference]: Start difference. First operand 128 states and 159 transitions. Second operand 30 states. [2019-10-13 17:44:12,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:12,847 INFO L93 Difference]: Finished difference Result 238 states and 306 transitions. [2019-10-13 17:44:12,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 17:44:12,848 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 78 [2019-10-13 17:44:12,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:12,850 INFO L225 Difference]: With dead ends: 238 [2019-10-13 17:44:12,850 INFO L226 Difference]: Without dead ends: 141 [2019-10-13 17:44:12,851 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=603, Invalid=1203, Unknown=0, NotChecked=0, Total=1806 [2019-10-13 17:44:12,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-10-13 17:44:12,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 136. [2019-10-13 17:44:12,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-13 17:44:12,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 169 transitions. [2019-10-13 17:44:12,857 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 169 transitions. Word has length 78 [2019-10-13 17:44:12,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:12,857 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 169 transitions. [2019-10-13 17:44:12,857 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-13 17:44:12,857 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 169 transitions. [2019-10-13 17:44:12,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-13 17:44:12,858 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:12,859 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:13,059 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:13,059 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:13,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:13,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1762199565, now seen corresponding path program 16 times [2019-10-13 17:44:13,060 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:13,060 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973403353] [2019-10-13 17:44:13,060 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,060 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,061 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:13,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:13,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:13,287 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2019-10-13 17:44:13,287 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973403353] [2019-10-13 17:44:13,287 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136381025] [2019-10-13 17:44:13,288 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 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 [2019-10-13 17:44:13,423 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:44:13,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:13,426 INFO L256 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:44:13,427 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:13,458 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2019-10-13 17:44:13,459 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:13,459 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:44:13,459 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742120609] [2019-10-13 17:44:13,460 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:44:13,460 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:13,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:44:13,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:44:13,461 INFO L87 Difference]: Start difference. First operand 136 states and 169 transitions. Second operand 18 states. [2019-10-13 17:44:13,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:13,592 INFO L93 Difference]: Finished difference Result 242 states and 308 transitions. [2019-10-13 17:44:13,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:44:13,593 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 83 [2019-10-13 17:44:13,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:13,594 INFO L225 Difference]: With dead ends: 242 [2019-10-13 17:44:13,594 INFO L226 Difference]: Without dead ends: 139 [2019-10-13 17:44:13,594 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:44:13,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-10-13 17:44:13,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2019-10-13 17:44:13,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-10-13 17:44:13,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 171 transitions. [2019-10-13 17:44:13,599 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 171 transitions. Word has length 83 [2019-10-13 17:44:13,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:13,600 INFO L462 AbstractCegarLoop]: Abstraction has 138 states and 171 transitions. [2019-10-13 17:44:13,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:44:13,600 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 171 transitions. [2019-10-13 17:44:13,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-10-13 17:44:13,601 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:13,601 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:13,805 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:13,806 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:13,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:13,806 INFO L82 PathProgramCache]: Analyzing trace with hash -107343701, now seen corresponding path program 17 times [2019-10-13 17:44:13,806 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:13,806 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525742157] [2019-10-13 17:44:13,806 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,807 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,807 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:13,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:14,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:14,075 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-13 17:44:14,075 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525742157] [2019-10-13 17:44:14,075 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726556090] [2019-10-13 17:44:14,075 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 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