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_seq_init_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:46:17,071 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:46:17,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:46:17,092 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:46:17,092 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:46:17,095 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:46:17,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:46:17,106 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:46:17,110 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:46:17,113 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:46:17,115 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:46:17,117 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:46:17,117 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:46:17,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:46:17,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:46:17,123 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:46:17,125 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:46:17,125 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:46:17,127 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:46:17,132 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:46:17,136 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:46:17,138 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:46:17,139 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:46:17,140 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:46:17,142 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:46:17,147 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:46:17,149 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:46:17,149 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:46:17,150 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:46:17,151 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:46:17,152 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:46:17,152 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:46:17,152 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:46:17,153 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:46:17,153 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:46:17,155 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:46:17,156 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:46:17,183 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:46:17,185 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:46:17,186 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:46:17,186 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:46:17,187 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:46:17,187 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:46:17,187 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:46:17,188 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:46:17,188 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:46:17,188 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:46:17,188 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:46:17,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:46:17,189 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:46:17,189 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:46:17,189 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:46:17,189 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:46:17,190 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:46:17,191 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:46:17,191 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:46:17,191 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:46:17,191 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:46:17,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:46:17,192 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:46:17,192 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:46:17,192 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:46:17,192 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:46:17,193 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:46:17,193 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:46:17,193 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:46:17,506 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:46:17,532 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:46:17,536 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:46:17,537 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:46:17,538 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:46:17,538 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_seq_init_ground.i [2019-10-14 21:46:17,614 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8abecdf8a/4b3632690c7c40eb8306655497c17b5c/FLAGf13ef4b5f [2019-10-14 21:46:18,064 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:46:18,065 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_seq_init_ground.i [2019-10-14 21:46:18,074 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8abecdf8a/4b3632690c7c40eb8306655497c17b5c/FLAGf13ef4b5f [2019-10-14 21:46:18,426 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8abecdf8a/4b3632690c7c40eb8306655497c17b5c [2019-10-14 21:46:18,437 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:46:18,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:46:18,440 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:46:18,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:46:18,445 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:46:18,447 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,449 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69137f33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18, skipping insertion in model container [2019-10-14 21:46:18,450 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,457 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:46:18,472 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:46:18,654 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:46:18,664 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:46:18,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:46:18,704 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:46:18,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18 WrapperNode [2019-10-14 21:46:18,705 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:46:18,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:46:18,706 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:46:18,706 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:46:18,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,808 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,813 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,814 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... [2019-10-14 21:46:18,816 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:46:18,817 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:46:18,817 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:46:18,817 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:46:18,818 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:46:18,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:46:18,887 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:46:18,887 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:46:18,887 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:46:18,887 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:46:18,887 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:46:18,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:46:18,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:46:19,111 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:46:19,112 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 21:46:19,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:46:19 BoogieIcfgContainer [2019-10-14 21:46:19,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:46:19,115 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:46:19,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:46:19,118 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:46:19,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:46:18" (1/3) ... [2019-10-14 21:46:19,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@534ed9bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:46:19, skipping insertion in model container [2019-10-14 21:46:19,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:46:18" (2/3) ... [2019-10-14 21:46:19,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@534ed9bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:46:19, skipping insertion in model container [2019-10-14 21:46:19,121 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:46:19" (3/3) ... [2019-10-14 21:46:19,122 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_seq_init_ground.i [2019-10-14 21:46:19,139 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:46:19,152 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:46:19,168 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:46:19,229 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:46:19,229 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:46:19,229 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:46:19,229 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:46:19,230 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:46:19,230 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:46:19,230 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:46:19,230 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:46:19,249 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-10-14 21:46:19,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-14 21:46:19,255 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:19,256 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:19,258 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:19,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:19,263 INFO L82 PathProgramCache]: Analyzing trace with hash -441053002, now seen corresponding path program 1 times [2019-10-14 21:46:19,270 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:19,271 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812105167] [2019-10-14 21:46:19,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,271 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:19,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:19,435 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812105167] [2019-10-14 21:46:19,436 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:46:19,436 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:46:19,436 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962073562] [2019-10-14 21:46:19,440 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:46:19,441 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:19,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:46:19,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:46:19,455 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-10-14 21:46:19,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:19,541 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2019-10-14 21:46:19,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:46:19,543 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-14 21:46:19,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:19,551 INFO L225 Difference]: With dead ends: 39 [2019-10-14 21:46:19,551 INFO L226 Difference]: Without dead ends: 18 [2019-10-14 21:46:19,554 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:46:19,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-14 21:46:19,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-14 21:46:19,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-14 21:46:19,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-14 21:46:19,589 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-10-14 21:46:19,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:19,590 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-14 21:46:19,590 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:46:19,591 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-14 21:46:19,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-14 21:46:19,592 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:19,592 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:19,592 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:19,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:19,593 INFO L82 PathProgramCache]: Analyzing trace with hash 303899570, now seen corresponding path program 1 times [2019-10-14 21:46:19,593 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:19,594 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905108439] [2019-10-14 21:46:19,594 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,594 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:19,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:19,693 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905108439] [2019-10-14 21:46:19,694 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:46:19,694 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:46:19,694 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136171271] [2019-10-14 21:46:19,696 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:46:19,696 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:19,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:46:19,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:46:19,697 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 4 states. [2019-10-14 21:46:19,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:19,756 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-10-14 21:46:19,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:46:19,757 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-14 21:46:19,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:19,758 INFO L225 Difference]: With dead ends: 30 [2019-10-14 21:46:19,759 INFO L226 Difference]: Without dead ends: 19 [2019-10-14 21:46:19,761 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:46:19,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-14 21:46:19,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-14 21:46:19,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-14 21:46:19,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-10-14 21:46:19,770 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 13 [2019-10-14 21:46:19,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:19,771 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-10-14 21:46:19,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:46:19,771 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-10-14 21:46:19,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:46:19,774 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:19,775 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:19,775 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:19,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:19,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1260126610, now seen corresponding path program 1 times [2019-10-14 21:46:19,777 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:19,778 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107210239] [2019-10-14 21:46:19,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:19,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:19,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:19,886 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107210239] [2019-10-14 21:46:19,887 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789394101] [2019-10-14 21:46:19,887 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:19,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:19,958 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:46:19,963 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:19,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:19,983 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:19,983 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2019-10-14 21:46:19,984 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744712779] [2019-10-14 21:46:19,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-14 21:46:19,984 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:19,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-14 21:46:19,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:46:19,985 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2019-10-14 21:46:20,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:20,050 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2019-10-14 21:46:20,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:46:20,051 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2019-10-14 21:46:20,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:20,053 INFO L225 Difference]: With dead ends: 31 [2019-10-14 21:46:20,053 INFO L226 Difference]: Without dead ends: 20 [2019-10-14 21:46:20,053 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-14 21:46:20,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-14 21:46:20,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-14 21:46:20,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-14 21:46:20,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-10-14 21:46:20,061 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2019-10-14 21:46:20,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:20,062 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-10-14 21:46:20,062 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-14 21:46:20,062 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-10-14 21:46:20,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:46:20,064 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:20,064 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:20,265 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:20,268 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:20,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:20,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1794669362, now seen corresponding path program 2 times [2019-10-14 21:46:20,269 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:20,270 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105430772] [2019-10-14 21:46:20,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,270 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:20,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,384 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:20,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105430772] [2019-10-14 21:46:20,384 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352589839] [2019-10-14 21:46:20,385 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:20,431 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:20,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:20,432 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:46:20,434 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:20,440 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:20,440 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:20,441 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-10-14 21:46:20,441 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483957426] [2019-10-14 21:46:20,441 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:46:20,442 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:20,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:46:20,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:46:20,443 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2019-10-14 21:46:20,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:20,515 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2019-10-14 21:46:20,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:46:20,516 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-10-14 21:46:20,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:20,518 INFO L225 Difference]: With dead ends: 32 [2019-10-14 21:46:20,518 INFO L226 Difference]: Without dead ends: 21 [2019-10-14 21:46:20,520 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:46:20,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-14 21:46:20,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-14 21:46:20,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 21:46:20,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-10-14 21:46:20,526 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2019-10-14 21:46:20,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:20,526 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-10-14 21:46:20,527 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:46:20,527 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-10-14 21:46:20,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-14 21:46:20,527 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:20,528 INFO L380 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:20,736 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:20,737 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:20,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:20,737 INFO L82 PathProgramCache]: Analyzing trace with hash 2004063982, now seen corresponding path program 3 times [2019-10-14 21:46:20,738 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:20,738 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502583825] [2019-10-14 21:46:20,739 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,739 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:20,739 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:20,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:20,820 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:20,820 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502583825] [2019-10-14 21:46:20,821 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333431695] [2019-10-14 21:46:20,821 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:20,880 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:46:20,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:20,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:46:20,885 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:20,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:20,896 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:20,896 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2019-10-14 21:46:20,897 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647310685] [2019-10-14 21:46:20,898 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:46:20,899 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:20,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:46:20,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:46:20,900 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2019-10-14 21:46:20,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:20,965 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-10-14 21:46:20,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:46:20,966 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-10-14 21:46:20,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:20,967 INFO L225 Difference]: With dead ends: 33 [2019-10-14 21:46:20,967 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:46:20,968 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:46:20,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:46:20,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:46:20,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:46:20,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2019-10-14 21:46:20,973 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2019-10-14 21:46:20,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:20,973 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2019-10-14 21:46:20,973 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:46:20,973 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2019-10-14 21:46:20,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:46:20,974 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:20,974 INFO L380 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:21,177 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:21,178 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:21,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:21,178 INFO L82 PathProgramCache]: Analyzing trace with hash -94637390, now seen corresponding path program 4 times [2019-10-14 21:46:21,178 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:21,178 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915404036] [2019-10-14 21:46:21,179 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:21,179 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:21,180 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:21,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:21,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:21,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:21,293 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915404036] [2019-10-14 21:46:21,293 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377253874] [2019-10-14 21:46:21,294 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:21,326 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:21,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:21,327 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:46:21,329 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:21,335 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:21,336 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:21,336 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2019-10-14 21:46:21,336 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465056836] [2019-10-14 21:46:21,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:46:21,337 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:21,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:46:21,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:46:21,337 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2019-10-14 21:46:21,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:21,406 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2019-10-14 21:46:21,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:46:21,407 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2019-10-14 21:46:21,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:21,408 INFO L225 Difference]: With dead ends: 34 [2019-10-14 21:46:21,408 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 21:46:21,408 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:46:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 21:46:21,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-10-14 21:46:21,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 21:46:21,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-10-14 21:46:21,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 17 [2019-10-14 21:46:21,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:21,414 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-10-14 21:46:21,414 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:46:21,414 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-10-14 21:46:21,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-14 21:46:21,415 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:21,415 INFO L380 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:21,625 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:21,625 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:21,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:21,626 INFO L82 PathProgramCache]: Analyzing trace with hash -729870482, now seen corresponding path program 5 times [2019-10-14 21:46:21,626 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:21,626 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515547087] [2019-10-14 21:46:21,626 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:21,626 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:21,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:21,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:21,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:21,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:21,716 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515547087] [2019-10-14 21:46:21,717 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76650023] [2019-10-14 21:46:21,717 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:21,765 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-10-14 21:46:21,766 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:21,767 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:46:21,768 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:21,774 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:21,775 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:21,775 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2019-10-14 21:46:21,775 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028927633] [2019-10-14 21:46:21,776 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:46:21,776 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:21,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:46:21,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:46:21,777 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2019-10-14 21:46:21,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:21,853 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2019-10-14 21:46:21,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:46:21,853 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2019-10-14 21:46:21,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:21,854 INFO L225 Difference]: With dead ends: 35 [2019-10-14 21:46:21,854 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:46:21,855 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:46:21,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:46:21,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-14 21:46:21,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:46:21,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-10-14 21:46:21,861 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2019-10-14 21:46:21,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:21,862 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-10-14 21:46:21,862 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:46:21,862 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-10-14 21:46:21,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:46:21,864 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:21,864 INFO L380 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:22,067 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:22,068 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:22,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:22,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1052740146, now seen corresponding path program 6 times [2019-10-14 21:46:22,069 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:22,069 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669173348] [2019-10-14 21:46:22,070 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,070 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,070 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:22,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:22,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:22,203 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:22,204 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669173348] [2019-10-14 21:46:22,204 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215609652] [2019-10-14 21:46:22,206 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:22,251 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-10-14 21:46:22,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:22,253 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:46:22,254 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:22,262 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:22,263 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:22,263 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 10 [2019-10-14 21:46:22,263 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821387439] [2019-10-14 21:46:22,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:46:22,264 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:22,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:46:22,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:46:22,265 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 10 states. [2019-10-14 21:46:22,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:22,324 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2019-10-14 21:46:22,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:46:22,325 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2019-10-14 21:46:22,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:22,326 INFO L225 Difference]: With dead ends: 36 [2019-10-14 21:46:22,326 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:46:22,326 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:46:22,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:46:22,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-10-14 21:46:22,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:46:22,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-10-14 21:46:22,331 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2019-10-14 21:46:22,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:22,331 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-10-14 21:46:22,331 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:46:22,332 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-10-14 21:46:22,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-14 21:46:22,332 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:22,333 INFO L380 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:22,534 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:22,535 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:22,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:22,536 INFO L82 PathProgramCache]: Analyzing trace with hash 479094766, now seen corresponding path program 7 times [2019-10-14 21:46:22,536 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:22,537 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941668824] [2019-10-14 21:46:22,537 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,537 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,538 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:22,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:22,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:22,651 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:22,652 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941668824] [2019-10-14 21:46:22,652 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948871485] [2019-10-14 21:46:22,652 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:22,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:22,705 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:46:22,707 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:22,714 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:22,714 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:22,715 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 11 [2019-10-14 21:46:22,715 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137008677] [2019-10-14 21:46:22,715 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:46:22,716 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:22,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:46:22,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:46:22,716 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 11 states. [2019-10-14 21:46:22,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:22,775 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2019-10-14 21:46:22,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:46:22,775 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2019-10-14 21:46:22,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:22,776 INFO L225 Difference]: With dead ends: 37 [2019-10-14 21:46:22,776 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:46:22,777 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:46:22,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:46:22,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:46:22,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:46:22,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-10-14 21:46:22,783 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 20 [2019-10-14 21:46:22,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:22,783 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-10-14 21:46:22,783 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:46:22,783 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-10-14 21:46:22,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 21:46:22,784 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:22,784 INFO L380 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:22,984 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:22,985 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:22,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:22,986 INFO L82 PathProgramCache]: Analyzing trace with hash -124042830, now seen corresponding path program 8 times [2019-10-14 21:46:22,986 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:22,987 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707308210] [2019-10-14 21:46:22,987 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,987 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:22,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:22,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:23,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:23,083 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:23,083 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707308210] [2019-10-14 21:46:23,084 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902513718] [2019-10-14 21:46:23,084 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:23,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:23,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:23,129 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:46:23,131 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:23,139 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:23,140 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:23,140 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 12 [2019-10-14 21:46:23,140 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730593642] [2019-10-14 21:46:23,140 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:46:23,141 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:23,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:46:23,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:46:23,142 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 12 states. [2019-10-14 21:46:23,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:23,261 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2019-10-14 21:46:23,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:46:23,262 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2019-10-14 21:46:23,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:23,263 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:46:23,264 INFO L226 Difference]: Without dead ends: 27 [2019-10-14 21:46:23,265 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:46:23,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-14 21:46:23,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-10-14 21:46:23,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 21:46:23,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2019-10-14 21:46:23,270 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 21 [2019-10-14 21:46:23,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:23,270 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2019-10-14 21:46:23,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:46:23,270 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2019-10-14 21:46:23,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 21:46:23,271 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:23,271 INFO L380 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:23,482 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:23,482 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:23,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:23,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1641439122, now seen corresponding path program 9 times [2019-10-14 21:46:23,484 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:23,484 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125294695] [2019-10-14 21:46:23,484 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:23,484 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:23,485 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:23,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:23,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:23,619 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:23,619 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125294695] [2019-10-14 21:46:23,619 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421902037] [2019-10-14 21:46:23,619 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:23,681 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:46:23,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:23,683 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:46:23,684 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:23,692 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:23,693 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:23,693 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 13 [2019-10-14 21:46:23,693 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331269562] [2019-10-14 21:46:23,694 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:46:23,694 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:23,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:46:23,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:46:23,695 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 13 states. [2019-10-14 21:46:23,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:23,783 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2019-10-14 21:46:23,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:46:23,785 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2019-10-14 21:46:23,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:23,786 INFO L225 Difference]: With dead ends: 39 [2019-10-14 21:46:23,786 INFO L226 Difference]: Without dead ends: 28 [2019-10-14 21:46:23,787 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:46:23,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-14 21:46:23,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-14 21:46:23,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:46:23,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2019-10-14 21:46:23,794 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 22 [2019-10-14 21:46:23,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:23,795 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2019-10-14 21:46:23,795 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:46:23,795 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2019-10-14 21:46:23,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:46:23,796 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:23,797 INFO L380 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:24,006 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:24,007 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:24,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:24,008 INFO L82 PathProgramCache]: Analyzing trace with hash -1436083918, now seen corresponding path program 10 times [2019-10-14 21:46:24,008 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:24,008 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604696992] [2019-10-14 21:46:24,009 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:24,009 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:24,009 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:24,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:24,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:24,166 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:24,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604696992] [2019-10-14 21:46:24,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937673696] [2019-10-14 21:46:24,168 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:24,219 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:24,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:24,220 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:46:24,222 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:24,239 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:24,239 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:24,239 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2019-10-14 21:46:24,240 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58796339] [2019-10-14 21:46:24,241 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:46:24,241 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:24,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:46:24,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:46:24,242 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2019-10-14 21:46:24,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:24,344 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2019-10-14 21:46:24,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:46:24,344 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2019-10-14 21:46:24,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:24,345 INFO L225 Difference]: With dead ends: 40 [2019-10-14 21:46:24,345 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:46:24,345 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:46:24,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:46:24,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-14 21:46:24,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-14 21:46:24,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-10-14 21:46:24,350 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2019-10-14 21:46:24,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:24,350 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-10-14 21:46:24,350 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:46:24,350 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-10-14 21:46:24,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-14 21:46:24,351 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:24,351 INFO L380 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:24,559 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:24,560 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:24,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:24,561 INFO L82 PathProgramCache]: Analyzing trace with hash 634960110, now seen corresponding path program 11 times [2019-10-14 21:46:24,561 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:24,562 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094988321] [2019-10-14 21:46:24,562 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:24,562 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:24,563 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:24,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:24,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:24,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094988321] [2019-10-14 21:46:24,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213161051] [2019-10-14 21:46:24,723 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:24,805 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-10-14 21:46:24,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:24,807 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:46:24,808 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:24,816 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:24,816 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:24,817 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 15 [2019-10-14 21:46:24,817 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565469354] [2019-10-14 21:46:24,817 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:46:24,817 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:24,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:46:24,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:46:24,818 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 15 states. [2019-10-14 21:46:24,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:24,907 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-10-14 21:46:24,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:46:24,908 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 24 [2019-10-14 21:46:24,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:24,908 INFO L225 Difference]: With dead ends: 41 [2019-10-14 21:46:24,909 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 21:46:24,909 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:46:24,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 21:46:24,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-14 21:46:24,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 21:46:24,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2019-10-14 21:46:24,913 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 24 [2019-10-14 21:46:24,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:24,914 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2019-10-14 21:46:24,914 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:46:24,914 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2019-10-14 21:46:24,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:46:24,915 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:24,915 INFO L380 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:25,123 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:25,123 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:25,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:25,124 INFO L82 PathProgramCache]: Analyzing trace with hash 412815538, now seen corresponding path program 12 times [2019-10-14 21:46:25,125 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:25,125 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214748872] [2019-10-14 21:46:25,125 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:25,125 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:25,126 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:25,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:25,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:25,266 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:25,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214748872] [2019-10-14 21:46:25,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287996203] [2019-10-14 21:46:25,266 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:25,397 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:46:25,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:25,399 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:46:25,401 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:25,410 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:25,410 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:25,410 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 16 [2019-10-14 21:46:25,411 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173616517] [2019-10-14 21:46:25,411 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:46:25,411 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:25,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:46:25,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:46:25,412 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 16 states. [2019-10-14 21:46:25,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:25,516 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2019-10-14 21:46:25,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:46:25,516 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 25 [2019-10-14 21:46:25,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:25,516 INFO L225 Difference]: With dead ends: 42 [2019-10-14 21:46:25,517 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:46:25,517 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:46:25,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:46:25,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-14 21:46:25,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-14 21:46:25,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-10-14 21:46:25,521 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 25 [2019-10-14 21:46:25,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:25,522 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-10-14 21:46:25,522 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:46:25,522 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-10-14 21:46:25,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-14 21:46:25,523 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:25,523 INFO L380 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:25,726 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:25,727 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:25,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:25,727 INFO L82 PathProgramCache]: Analyzing trace with hash 2116268398, now seen corresponding path program 13 times [2019-10-14 21:46:25,728 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:25,728 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475076791] [2019-10-14 21:46:25,728 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:25,729 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:25,729 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:25,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:25,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:25,894 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:25,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475076791] [2019-10-14 21:46:25,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11548661] [2019-10-14 21:46:25,895 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:25,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:25,964 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:46:25,966 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:25,974 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:25,975 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:25,975 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 17 [2019-10-14 21:46:25,975 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182941893] [2019-10-14 21:46:25,976 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:46:25,976 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:25,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:46:25,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:46:25,977 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 17 states. [2019-10-14 21:46:26,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:26,090 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2019-10-14 21:46:26,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:46:26,090 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 26 [2019-10-14 21:46:26,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:26,091 INFO L225 Difference]: With dead ends: 43 [2019-10-14 21:46:26,091 INFO L226 Difference]: Without dead ends: 32 [2019-10-14 21:46:26,095 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:46:26,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-10-14 21:46:26,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-10-14 21:46:26,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:46:26,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2019-10-14 21:46:26,105 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 26 [2019-10-14 21:46:26,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:26,106 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2019-10-14 21:46:26,108 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:46:26,108 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2019-10-14 21:46:26,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:46:26,110 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:26,110 INFO L380 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:26,314 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:26,314 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:26,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:26,315 INFO L82 PathProgramCache]: Analyzing trace with hash -911267790, now seen corresponding path program 14 times [2019-10-14 21:46:26,315 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:26,315 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382186612] [2019-10-14 21:46:26,315 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:26,316 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:26,316 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:26,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:26,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:26,509 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:26,509 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382186612] [2019-10-14 21:46:26,510 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857154089] [2019-10-14 21:46:26,510 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:26,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:26,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:26,553 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:46:26,555 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:26,564 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:26,564 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:26,564 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 18 [2019-10-14 21:46:26,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363260400] [2019-10-14 21:46:26,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:46:26,565 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:26,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:46:26,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:46:26,566 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 18 states. [2019-10-14 21:46:26,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:26,620 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2019-10-14 21:46:26,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:46:26,620 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 27 [2019-10-14 21:46:26,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:26,621 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:46:26,622 INFO L226 Difference]: Without dead ends: 33 [2019-10-14 21:46:26,623 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:46:26,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-14 21:46:26,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-10-14 21:46:26,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-14 21:46:26,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2019-10-14 21:46:26,627 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 27 [2019-10-14 21:46:26,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:26,628 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2019-10-14 21:46:26,628 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:46:26,628 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2019-10-14 21:46:26,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-14 21:46:26,629 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:26,629 INFO L380 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:26,833 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:26,833 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:26,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:26,834 INFO L82 PathProgramCache]: Analyzing trace with hash -275609106, now seen corresponding path program 15 times [2019-10-14 21:46:26,835 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:26,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613382284] [2019-10-14 21:46:26,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:26,836 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:26,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:26,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:27,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:27,044 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:27,045 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613382284] [2019-10-14 21:46:27,045 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540162902] [2019-10-14 21:46:27,045 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 [2019-10-14 21:46:27,325 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:46:27,325 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:27,326 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:46:27,328 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:27,340 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:27,341 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:27,341 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 19 [2019-10-14 21:46:27,341 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97136199] [2019-10-14 21:46:27,342 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:46:27,342 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:27,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:46:27,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:46:27,343 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2019-10-14 21:46:27,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:27,405 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2019-10-14 21:46:27,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:46:27,406 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 28 [2019-10-14 21:46:27,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:27,407 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:46:27,407 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:46:27,408 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:46:27,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:46:27,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-10-14 21:46:27,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:46:27,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2019-10-14 21:46:27,413 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 28 [2019-10-14 21:46:27,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:27,413 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2019-10-14 21:46:27,414 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:46:27,414 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2019-10-14 21:46:27,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:46:27,415 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:27,415 INFO L380 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:27,620 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:27,621 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:27,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:27,621 INFO L82 PathProgramCache]: Analyzing trace with hash -2045026382, now seen corresponding path program 16 times [2019-10-14 21:46:27,621 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:27,621 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27875976] [2019-10-14 21:46:27,621 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:27,622 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:27,622 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:27,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:27,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:27,851 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:27,851 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27875976] [2019-10-14 21:46:27,852 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999036547] [2019-10-14 21:46:27,852 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 [2019-10-14 21:46:27,904 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:27,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:27,905 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:46:27,906 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:27,916 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:27,916 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:27,916 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 20 [2019-10-14 21:46:27,916 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97292774] [2019-10-14 21:46:27,917 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:46:27,917 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:27,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:46:27,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:46:27,918 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 20 states. [2019-10-14 21:46:28,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:28,032 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2019-10-14 21:46:28,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:46:28,033 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2019-10-14 21:46:28,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:28,033 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:46:28,033 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:46:28,034 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:46:28,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:46:28,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-10-14 21:46:28,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-14 21:46:28,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2019-10-14 21:46:28,038 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 29 [2019-10-14 21:46:28,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:28,039 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2019-10-14 21:46:28,039 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:46:28,039 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2019-10-14 21:46:28,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 21:46:28,040 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:28,040 INFO L380 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:28,243 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:28,244 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:28,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:28,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1062387090, now seen corresponding path program 17 times [2019-10-14 21:46:28,245 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:28,245 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133573157] [2019-10-14 21:46:28,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:28,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:28,246 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:28,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:28,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:28,486 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:28,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133573157] [2019-10-14 21:46:28,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869224952] [2019-10-14 21:46:28,487 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 [2019-10-14 21:46:28,743 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-10-14 21:46:28,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:28,746 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:46:28,747 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:28,756 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:28,756 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:28,756 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 21 [2019-10-14 21:46:28,756 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917192188] [2019-10-14 21:46:28,757 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:46:28,757 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:28,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:46:28,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:46:28,758 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 21 states. [2019-10-14 21:46:28,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:28,873 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2019-10-14 21:46:28,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:46:28,874 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 30 [2019-10-14 21:46:28,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:28,875 INFO L225 Difference]: With dead ends: 47 [2019-10-14 21:46:28,875 INFO L226 Difference]: Without dead ends: 36 [2019-10-14 21:46:28,875 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:46:28,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-14 21:46:28,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-14 21:46:28,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:46:28,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2019-10-14 21:46:28,886 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 30 [2019-10-14 21:46:28,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:28,886 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2019-10-14 21:46:28,886 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:46:28,886 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2019-10-14 21:46:28,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-14 21:46:28,887 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:28,887 INFO L380 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:29,098 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:29,099 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:29,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:29,100 INFO L82 PathProgramCache]: Analyzing trace with hash -665340110, now seen corresponding path program 18 times [2019-10-14 21:46:29,100 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:29,100 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113526411] [2019-10-14 21:46:29,101 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:29,101 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:29,101 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:29,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:29,395 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:29,396 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113526411] [2019-10-14 21:46:29,396 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84533458] [2019-10-14 21:46:29,396 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:29,850 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2019-10-14 21:46:29,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:29,853 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:46:29,854 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:29,872 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:29,872 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:29,872 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 22 [2019-10-14 21:46:29,872 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908275432] [2019-10-14 21:46:29,873 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:46:29,873 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:29,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:46:29,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:46:29,874 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 22 states. [2019-10-14 21:46:29,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:29,983 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-10-14 21:46:29,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:46:29,984 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 31 [2019-10-14 21:46:29,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:29,984 INFO L225 Difference]: With dead ends: 48 [2019-10-14 21:46:29,985 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:46:29,985 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:46:29,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:46:29,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-10-14 21:46:29,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 21:46:29,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2019-10-14 21:46:29,989 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 31 [2019-10-14 21:46:29,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:29,989 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2019-10-14 21:46:29,989 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:46:29,990 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2019-10-14 21:46:29,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:46:29,990 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:29,990 INFO L380 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:30,199 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:30,199 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:30,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:30,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1241785618, now seen corresponding path program 19 times [2019-10-14 21:46:30,200 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:30,200 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534652844] [2019-10-14 21:46:30,201 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:30,201 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:30,201 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:30,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:30,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:30,427 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:30,428 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534652844] [2019-10-14 21:46:30,428 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156565521] [2019-10-14 21:46:30,428 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:30,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:30,484 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:46:30,485 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:30,494 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:30,495 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:30,495 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 23 [2019-10-14 21:46:30,495 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253713100] [2019-10-14 21:46:30,496 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:46:30,496 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:30,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:46:30,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:46:30,497 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 23 states. [2019-10-14 21:46:30,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:30,627 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2019-10-14 21:46:30,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:46:30,627 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 32 [2019-10-14 21:46:30,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:30,628 INFO L225 Difference]: With dead ends: 49 [2019-10-14 21:46:30,628 INFO L226 Difference]: Without dead ends: 38 [2019-10-14 21:46:30,629 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:46:30,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-10-14 21:46:30,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-10-14 21:46:30,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-14 21:46:30,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2019-10-14 21:46:30,632 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 32 [2019-10-14 21:46:30,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:30,633 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2019-10-14 21:46:30,633 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:46:30,633 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2019-10-14 21:46:30,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-14 21:46:30,633 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:30,634 INFO L380 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:30,840 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:30,840 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:30,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:30,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1931727182, now seen corresponding path program 20 times [2019-10-14 21:46:30,841 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:30,841 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679159784] [2019-10-14 21:46:30,841 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:30,842 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:30,842 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:30,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:31,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:31,098 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:31,098 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679159784] [2019-10-14 21:46:31,098 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160859193] [2019-10-14 21:46:31,098 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:31,150 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:31,150 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:31,152 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:46:31,153 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:31,162 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:31,162 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:31,162 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 24 [2019-10-14 21:46:31,162 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373527059] [2019-10-14 21:46:31,163 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:46:31,163 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:31,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:46:31,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:46:31,164 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 24 states. [2019-10-14 21:46:31,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:31,251 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2019-10-14 21:46:31,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:46:31,254 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2019-10-14 21:46:31,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:31,255 INFO L225 Difference]: With dead ends: 50 [2019-10-14 21:46:31,255 INFO L226 Difference]: Without dead ends: 39 [2019-10-14 21:46:31,255 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:46:31,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-14 21:46:31,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-10-14 21:46:31,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-10-14 21:46:31,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2019-10-14 21:46:31,259 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 33 [2019-10-14 21:46:31,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:31,259 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2019-10-14 21:46:31,259 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:46:31,260 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2019-10-14 21:46:31,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-14 21:46:31,260 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:31,260 INFO L380 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:31,464 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:31,464 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:31,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:31,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1845079186, now seen corresponding path program 21 times [2019-10-14 21:46:31,465 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:31,465 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601496847] [2019-10-14 21:46:31,466 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:31,466 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:31,466 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:31,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:31,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:31,747 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:31,748 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601496847] [2019-10-14 21:46:31,748 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001694339] [2019-10-14 21:46:31,748 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:32,406 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-10-14 21:46:32,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:32,408 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 21:46:32,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:32,418 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:32,419 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:32,419 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 25 [2019-10-14 21:46:32,419 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959304301] [2019-10-14 21:46:32,419 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:46:32,420 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:32,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:46:32,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:46:32,420 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 25 states. [2019-10-14 21:46:32,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:32,535 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2019-10-14 21:46:32,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:46:32,535 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 34 [2019-10-14 21:46:32,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:32,536 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:46:32,536 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:46:32,537 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:46:32,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:46:32,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-14 21:46:32,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:46:32,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2019-10-14 21:46:32,540 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 34 [2019-10-14 21:46:32,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:32,541 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2019-10-14 21:46:32,541 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:46:32,541 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2019-10-14 21:46:32,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:46:32,541 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:32,542 INFO L380 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:32,742 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:32,742 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:32,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:32,743 INFO L82 PathProgramCache]: Analyzing trace with hash 841008690, now seen corresponding path program 22 times [2019-10-14 21:46:32,743 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:32,743 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939108479] [2019-10-14 21:46:32,744 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:32,744 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:32,744 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:32,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:33,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:33,058 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939108479] [2019-10-14 21:46:33,058 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369078738] [2019-10-14 21:46:33,059 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:33,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:33,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:33,121 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:46:33,122 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:33,130 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:33,131 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:33,131 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 26 [2019-10-14 21:46:33,131 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193840986] [2019-10-14 21:46:33,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 21:46:33,132 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:33,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 21:46:33,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:46:33,133 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 26 states. [2019-10-14 21:46:33,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:33,263 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2019-10-14 21:46:33,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:46:33,263 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 35 [2019-10-14 21:46:33,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:33,264 INFO L225 Difference]: With dead ends: 52 [2019-10-14 21:46:33,264 INFO L226 Difference]: Without dead ends: 41 [2019-10-14 21:46:33,265 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:46:33,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-14 21:46:33,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-10-14 21:46:33,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-14 21:46:33,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-10-14 21:46:33,269 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 35 [2019-10-14 21:46:33,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:33,270 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-10-14 21:46:33,270 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 21:46:33,270 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-10-14 21:46:33,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-14 21:46:33,270 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:33,271 INFO L380 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:33,473 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:33,474 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:33,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:33,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1789613074, now seen corresponding path program 23 times [2019-10-14 21:46:33,475 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:33,475 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744401189] [2019-10-14 21:46:33,475 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:33,476 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:33,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:33,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:33,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:33,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744401189] [2019-10-14 21:46:33,792 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999745122] [2019-10-14 21:46:33,792 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:34,315 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2019-10-14 21:46:34,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:34,318 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 21:46:34,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:34,329 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:34,330 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:34,330 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 27 [2019-10-14 21:46:34,330 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150095991] [2019-10-14 21:46:34,330 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:46:34,330 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:34,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:46:34,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:46:34,331 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 27 states. [2019-10-14 21:46:34,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:34,501 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2019-10-14 21:46:34,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:46:34,501 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 36 [2019-10-14 21:46:34,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:34,502 INFO L225 Difference]: With dead ends: 53 [2019-10-14 21:46:34,502 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 21:46:34,502 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:46:34,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 21:46:34,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-10-14 21:46:34,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 21:46:34,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2019-10-14 21:46:34,505 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 36 [2019-10-14 21:46:34,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:34,505 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2019-10-14 21:46:34,505 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:46:34,506 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2019-10-14 21:46:34,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:46:34,506 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:34,506 INFO L380 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:34,706 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:34,707 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:34,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:34,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1734509134, now seen corresponding path program 24 times [2019-10-14 21:46:34,708 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:34,708 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368625318] [2019-10-14 21:46:34,708 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:34,708 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:34,709 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:34,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:35,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:35,038 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:35,038 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368625318] [2019-10-14 21:46:35,038 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056709738] [2019-10-14 21:46:35,038 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:36,028 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:46:36,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:36,031 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 21:46:36,032 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:36,040 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:36,040 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:36,041 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 28 [2019-10-14 21:46:36,041 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731653950] [2019-10-14 21:46:36,041 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 21:46:36,041 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:36,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 21:46:36,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:46:36,042 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 28 states. [2019-10-14 21:46:36,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:36,203 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2019-10-14 21:46:36,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-14 21:46:36,203 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 37 [2019-10-14 21:46:36,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:36,204 INFO L225 Difference]: With dead ends: 54 [2019-10-14 21:46:36,204 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:46:36,205 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:46:36,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:46:36,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-10-14 21:46:36,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-14 21:46:36,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2019-10-14 21:46:36,208 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 37 [2019-10-14 21:46:36,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:36,208 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2019-10-14 21:46:36,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 21:46:36,209 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2019-10-14 21:46:36,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:46:36,209 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:36,209 INFO L380 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:36,410 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:36,410 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:36,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:36,411 INFO L82 PathProgramCache]: Analyzing trace with hash -26286994, now seen corresponding path program 25 times [2019-10-14 21:46:36,411 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:36,411 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700291183] [2019-10-14 21:46:36,411 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:36,412 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:36,412 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:36,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:36,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:36,880 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:36,880 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700291183] [2019-10-14 21:46:36,881 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151923935] [2019-10-14 21:46:36,881 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:36,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:36,972 INFO L256 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 21:46:36,973 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:36,983 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:36,984 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:36,984 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 29 [2019-10-14 21:46:36,984 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043519960] [2019-10-14 21:46:36,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 21:46:36,984 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:36,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 21:46:36,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:46:36,985 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 29 states. [2019-10-14 21:46:37,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:37,089 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2019-10-14 21:46:37,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:46:37,089 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 38 [2019-10-14 21:46:37,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:37,090 INFO L225 Difference]: With dead ends: 55 [2019-10-14 21:46:37,090 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 21:46:37,091 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:46:37,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 21:46:37,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-10-14 21:46:37,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:46:37,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2019-10-14 21:46:37,094 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 38 [2019-10-14 21:46:37,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:37,095 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2019-10-14 21:46:37,095 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 21:46:37,095 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2019-10-14 21:46:37,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:46:37,095 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:37,095 INFO L380 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:37,299 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:37,299 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:37,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:37,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1388991794, now seen corresponding path program 26 times [2019-10-14 21:46:37,300 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:37,300 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784826722] [2019-10-14 21:46:37,301 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:37,301 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:37,301 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:37,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:37,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:37,682 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:37,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784826722] [2019-10-14 21:46:37,682 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107518443] [2019-10-14 21:46:37,682 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:37,745 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:37,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:37,746 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:46:37,747 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:37,756 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:37,756 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:37,756 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 30 [2019-10-14 21:46:37,756 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031794327] [2019-10-14 21:46:37,757 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:46:37,757 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:37,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:46:37,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:46:37,758 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 30 states. [2019-10-14 21:46:37,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:37,863 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2019-10-14 21:46:37,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:46:37,863 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 39 [2019-10-14 21:46:37,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:37,864 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:46:37,864 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:46:37,865 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:46:37,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:46:37,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-10-14 21:46:37,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 21:46:37,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-10-14 21:46:37,869 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 39 [2019-10-14 21:46:37,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:37,869 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-10-14 21:46:37,869 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:46:37,869 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-10-14 21:46:37,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-10-14 21:46:37,870 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:37,870 INFO L380 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:38,070 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:38,071 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:38,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:38,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1982006034, now seen corresponding path program 27 times [2019-10-14 21:46:38,071 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:38,072 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542027315] [2019-10-14 21:46:38,072 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:38,072 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:38,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:38,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:38,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:38,524 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:38,525 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542027315] [2019-10-14 21:46:38,526 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837633494] [2019-10-14 21:46:38,526 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:40,519 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-10-14 21:46:40,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:40,522 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-14 21:46:40,523 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:40,532 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:40,532 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:40,533 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 31 [2019-10-14 21:46:40,533 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161671736] [2019-10-14 21:46:40,533 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:46:40,533 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:40,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:46:40,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:46:40,534 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 31 states. [2019-10-14 21:46:40,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:40,626 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2019-10-14 21:46:40,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-14 21:46:40,626 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 40 [2019-10-14 21:46:40,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:40,627 INFO L225 Difference]: With dead ends: 57 [2019-10-14 21:46:40,627 INFO L226 Difference]: Without dead ends: 46 [2019-10-14 21:46:40,628 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:46:40,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-14 21:46:40,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-10-14 21:46:40,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:46:40,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2019-10-14 21:46:40,631 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2019-10-14 21:46:40,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:40,632 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2019-10-14 21:46:40,632 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:46:40,632 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2019-10-14 21:46:40,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:46:40,632 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:40,632 INFO L380 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:40,837 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:40,838 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:40,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:40,839 INFO L82 PathProgramCache]: Analyzing trace with hash 891243698, now seen corresponding path program 28 times [2019-10-14 21:46:40,839 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:40,839 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219872012] [2019-10-14 21:46:40,840 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:40,840 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:40,840 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:40,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:41,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:41,225 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:41,225 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219872012] [2019-10-14 21:46:41,225 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878656138] [2019-10-14 21:46:41,225 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:41,289 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:41,289 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:41,290 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 21:46:41,291 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:41,300 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:41,301 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:41,301 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 32 [2019-10-14 21:46:41,301 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84726679] [2019-10-14 21:46:41,302 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-14 21:46:41,302 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:41,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-14 21:46:41,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-10-14 21:46:41,303 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 32 states. [2019-10-14 21:46:41,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:41,432 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2019-10-14 21:46:41,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 21:46:41,433 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 41 [2019-10-14 21:46:41,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:41,434 INFO L225 Difference]: With dead ends: 58 [2019-10-14 21:46:41,434 INFO L226 Difference]: Without dead ends: 47 [2019-10-14 21:46:41,435 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2019-10-14 21:46:41,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-14 21:46:41,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-10-14 21:46:41,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-14 21:46:41,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-10-14 21:46:41,438 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 41 [2019-10-14 21:46:41,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:41,438 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-10-14 21:46:41,438 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-14 21:46:41,439 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-10-14 21:46:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 21:46:41,439 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:41,439 INFO L380 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:41,641 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:41,642 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:41,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:41,642 INFO L82 PathProgramCache]: Analyzing trace with hash -232327826, now seen corresponding path program 29 times [2019-10-14 21:46:41,643 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:41,643 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360748466] [2019-10-14 21:46:41,643 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:41,643 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:41,643 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:41,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:42,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:42,086 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:42,086 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360748466] [2019-10-14 21:46:42,086 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363063512] [2019-10-14 21:46:42,086 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:43,112 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2019-10-14 21:46:43,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:43,116 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-14 21:46:43,118 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:43,126 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:43,126 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:43,126 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 33 [2019-10-14 21:46:43,126 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496876530] [2019-10-14 21:46:43,127 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-14 21:46:43,127 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:43,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-14 21:46:43,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:46:43,127 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 33 states. [2019-10-14 21:46:43,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:43,315 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2019-10-14 21:46:43,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-14 21:46:43,315 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 42 [2019-10-14 21:46:43,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:43,316 INFO L225 Difference]: With dead ends: 59 [2019-10-14 21:46:43,316 INFO L226 Difference]: Without dead ends: 48 [2019-10-14 21:46:43,317 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-14 21:46:43,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-14 21:46:43,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-10-14 21:46:43,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-14 21:46:43,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2019-10-14 21:46:43,320 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 42 [2019-10-14 21:46:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:43,320 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2019-10-14 21:46:43,320 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-14 21:46:43,320 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2019-10-14 21:46:43,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-14 21:46:43,321 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:43,321 INFO L380 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:43,522 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:43,523 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:43,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:43,523 INFO L82 PathProgramCache]: Analyzing trace with hash -703306702, now seen corresponding path program 30 times [2019-10-14 21:46:43,524 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:43,524 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582317919] [2019-10-14 21:46:43,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:43,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:43,525 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:43,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:43,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:43,972 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:43,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582317919] [2019-10-14 21:46:43,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511020370] [2019-10-14 21:46:43,972 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:45,955 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2019-10-14 21:46:45,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:45,961 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 21:46:45,962 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:45,972 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:45,972 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:45,972 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 34 [2019-10-14 21:46:45,972 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676923852] [2019-10-14 21:46:45,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 21:46:45,973 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:45,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 21:46:45,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:46:45,974 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 34 states. [2019-10-14 21:46:46,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:46,051 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2019-10-14 21:46:46,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:46:46,052 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 43 [2019-10-14 21:46:46,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:46,052 INFO L225 Difference]: With dead ends: 60 [2019-10-14 21:46:46,052 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:46:46,053 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:46:46,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:46:46,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-10-14 21:46:46,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-14 21:46:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2019-10-14 21:46:46,057 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 43 [2019-10-14 21:46:46,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:46,057 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2019-10-14 21:46:46,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 21:46:46,058 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2019-10-14 21:46:46,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-14 21:46:46,058 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:46,058 INFO L380 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:46,264 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:46,264 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:46,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:46,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1876217326, now seen corresponding path program 31 times [2019-10-14 21:46:46,265 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:46,265 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397128944] [2019-10-14 21:46:46,266 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:46,266 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:46,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:46,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:46,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:46,708 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:46,708 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397128944] [2019-10-14 21:46:46,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877450554] [2019-10-14 21:46:46,709 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:46,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:46,780 INFO L256 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-14 21:46:46,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:46,792 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:46,792 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:46,792 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 35 [2019-10-14 21:46:46,792 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903928145] [2019-10-14 21:46:46,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-14 21:46:46,793 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:46,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-14 21:46:46,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:46:46,794 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 35 states. [2019-10-14 21:46:46,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:46,977 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2019-10-14 21:46:46,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-14 21:46:46,977 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 44 [2019-10-14 21:46:46,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:46,978 INFO L225 Difference]: With dead ends: 61 [2019-10-14 21:46:46,978 INFO L226 Difference]: Without dead ends: 50 [2019-10-14 21:46:46,979 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-14 21:46:46,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-14 21:46:46,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-10-14 21:46:46,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 21:46:46,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2019-10-14 21:46:46,983 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 44 [2019-10-14 21:46:46,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:46,983 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2019-10-14 21:46:46,983 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-14 21:46:46,983 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2019-10-14 21:46:46,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-14 21:46:46,984 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:46,984 INFO L380 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:47,185 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:47,185 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:47,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:47,186 INFO L82 PathProgramCache]: Analyzing trace with hash 237083570, now seen corresponding path program 32 times [2019-10-14 21:46:47,186 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:47,186 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697504566] [2019-10-14 21:46:47,186 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:47,186 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:47,187 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:47,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:47,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:47,698 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:47,699 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697504566] [2019-10-14 21:46:47,699 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848437860] [2019-10-14 21:46:47,699 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:47,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:46:47,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:47,769 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 21:46:47,770 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:47,780 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:47,780 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:47,780 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 36 [2019-10-14 21:46:47,780 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292990203] [2019-10-14 21:46:47,781 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 21:46:47,781 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:47,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 21:46:47,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:46:47,782 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 36 states. [2019-10-14 21:46:47,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:47,901 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2019-10-14 21:46:47,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 21:46:47,902 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 45 [2019-10-14 21:46:47,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:47,902 INFO L225 Difference]: With dead ends: 62 [2019-10-14 21:46:47,903 INFO L226 Difference]: Without dead ends: 51 [2019-10-14 21:46:47,903 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:46:47,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-10-14 21:46:47,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-10-14 21:46:47,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-14 21:46:47,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2019-10-14 21:46:47,907 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 45 [2019-10-14 21:46:47,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:47,907 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2019-10-14 21:46:47,907 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 21:46:47,907 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2019-10-14 21:46:47,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:46:47,908 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:47,908 INFO L380 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:48,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:48,112 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:48,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:48,112 INFO L82 PathProgramCache]: Analyzing trace with hash 963544686, now seen corresponding path program 33 times [2019-10-14 21:46:48,113 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:48,113 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682477715] [2019-10-14 21:46:48,113 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:48,113 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:48,113 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:48,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:48,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:48,690 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:48,690 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682477715] [2019-10-14 21:46:48,690 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283008159] [2019-10-14 21:46:48,690 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:52,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-10-14 21:46:52,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:52,436 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 35 conjunts are in the unsatisfiable core [2019-10-14 21:46:52,437 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:52,447 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:52,448 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:52,448 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 37 [2019-10-14 21:46:52,448 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528837861] [2019-10-14 21:46:52,448 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-14 21:46:52,449 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:52,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-14 21:46:52,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 21:46:52,450 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 37 states. [2019-10-14 21:46:52,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:52,657 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2019-10-14 21:46:52,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-10-14 21:46:52,657 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 46 [2019-10-14 21:46:52,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:52,658 INFO L225 Difference]: With dead ends: 63 [2019-10-14 21:46:52,658 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:46:52,659 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-14 21:46:52,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:46:52,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-10-14 21:46:52,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:46:52,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2019-10-14 21:46:52,662 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 46 [2019-10-14 21:46:52,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:52,663 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2019-10-14 21:46:52,663 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-14 21:46:52,663 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2019-10-14 21:46:52,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:46:52,663 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:52,664 INFO L380 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:52,866 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:52,867 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:52,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:52,867 INFO L82 PathProgramCache]: Analyzing trace with hash 2009002802, now seen corresponding path program 34 times [2019-10-14 21:46:52,868 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:52,868 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738726261] [2019-10-14 21:46:52,868 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:52,868 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:52,868 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:53,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:53,414 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:53,414 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738726261] [2019-10-14 21:46:53,415 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [336298166] [2019-10-14 21:46:53,415 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:53,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:46:53,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:53,500 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-14 21:46:53,501 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:53,510 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:53,511 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:53,511 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 38 [2019-10-14 21:46:53,511 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974372846] [2019-10-14 21:46:53,511 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-14 21:46:53,512 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:53,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-14 21:46:53,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 21:46:53,513 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 38 states. [2019-10-14 21:46:53,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:53,721 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2019-10-14 21:46:53,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 21:46:53,722 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 47 [2019-10-14 21:46:53,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:53,722 INFO L225 Difference]: With dead ends: 64 [2019-10-14 21:46:53,722 INFO L226 Difference]: Without dead ends: 53 [2019-10-14 21:46:53,723 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 21:46:53,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-14 21:46:53,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-10-14 21:46:53,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-14 21:46:53,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-10-14 21:46:53,726 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 47 [2019-10-14 21:46:53,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:53,727 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-10-14 21:46:53,727 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-14 21:46:53,727 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-10-14 21:46:53,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-14 21:46:53,728 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:53,728 INFO L380 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:53,930 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:53,931 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:53,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:53,931 INFO L82 PathProgramCache]: Analyzing trace with hash 58466030, now seen corresponding path program 35 times [2019-10-14 21:46:53,932 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:53,932 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034838204] [2019-10-14 21:46:53,932 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:53,932 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:53,932 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:54,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:54,493 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:54,493 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034838204] [2019-10-14 21:46:54,493 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697452145] [2019-10-14 21:46:54,493 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:58,030 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2019-10-14 21:46:58,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:46:58,037 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 37 conjunts are in the unsatisfiable core [2019-10-14 21:46:58,038 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:46:58,049 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:58,049 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:46:58,049 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 39 [2019-10-14 21:46:58,050 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189239915] [2019-10-14 21:46:58,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-14 21:46:58,050 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:46:58,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-14 21:46:58,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:46:58,051 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 39 states. [2019-10-14 21:46:58,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:46:58,293 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2019-10-14 21:46:58,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-14 21:46:58,293 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 48 [2019-10-14 21:46:58,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:46:58,294 INFO L225 Difference]: With dead ends: 65 [2019-10-14 21:46:58,295 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:46:58,296 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:46:58,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:46:58,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-10-14 21:46:58,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-14 21:46:58,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2019-10-14 21:46:58,299 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 48 [2019-10-14 21:46:58,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:46:58,299 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2019-10-14 21:46:58,299 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-14 21:46:58,299 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2019-10-14 21:46:58,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-14 21:46:58,300 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:46:58,300 INFO L380 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:46:58,506 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:46:58,506 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:46:58,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:46:58,507 INFO L82 PathProgramCache]: Analyzing trace with hash -278631758, now seen corresponding path program 36 times [2019-10-14 21:46:58,507 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:46:58,508 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508561920] [2019-10-14 21:46:58,508 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:58,508 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:46:58,508 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:46:58,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:59,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:46:59,402 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:46:59,403 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508561920] [2019-10-14 21:46:59,403 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222868911] [2019-10-14 21:46:59,403 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:03,821 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-14 21:47:03,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:03,827 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 38 conjunts are in the unsatisfiable core [2019-10-14 21:47:03,828 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:03,837 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:03,838 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:03,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 40 [2019-10-14 21:47:03,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024459246] [2019-10-14 21:47:03,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-14 21:47:03,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:03,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-14 21:47:03,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2019-10-14 21:47:03,840 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 40 states. [2019-10-14 21:47:03,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:03,939 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2019-10-14 21:47:03,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-10-14 21:47:03,939 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 49 [2019-10-14 21:47:03,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:03,940 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:47:03,941 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:47:03,942 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2019-10-14 21:47:03,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:47:03,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-10-14 21:47:03,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-10-14 21:47:03,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2019-10-14 21:47:03,946 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 49 [2019-10-14 21:47:03,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:03,946 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2019-10-14 21:47:03,946 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-10-14 21:47:03,946 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2019-10-14 21:47:03,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-14 21:47:03,947 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:03,947 INFO L380 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:04,147 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:04,148 INFO L410 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:04,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:04,148 INFO L82 PathProgramCache]: Analyzing trace with hash -2138728594, now seen corresponding path program 37 times [2019-10-14 21:47:04,148 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:04,149 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269375738] [2019-10-14 21:47:04,149 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:04,149 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:04,149 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:04,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:04,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:04,785 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:04,785 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269375738] [2019-10-14 21:47:04,785 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276099312] [2019-10-14 21:47:04,785 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:04,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:04,875 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 39 conjunts are in the unsatisfiable core [2019-10-14 21:47:04,876 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:04,887 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:04,887 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:04,888 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 41 [2019-10-14 21:47:04,888 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217195285] [2019-10-14 21:47:04,888 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-10-14 21:47:04,888 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:04,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-10-14 21:47:04,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2019-10-14 21:47:04,889 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 41 states. [2019-10-14 21:47:05,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:05,054 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2019-10-14 21:47:05,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-10-14 21:47:05,055 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 50 [2019-10-14 21:47:05,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:05,056 INFO L225 Difference]: With dead ends: 67 [2019-10-14 21:47:05,056 INFO L226 Difference]: Without dead ends: 56 [2019-10-14 21:47:05,057 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2019-10-14 21:47:05,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-14 21:47:05,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-14 21:47:05,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:47:05,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2019-10-14 21:47:05,060 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 50 [2019-10-14 21:47:05,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:05,060 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2019-10-14 21:47:05,060 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-10-14 21:47:05,061 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2019-10-14 21:47:05,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:47:05,061 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:05,061 INFO L380 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:05,261 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:05,262 INFO L410 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:05,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:05,263 INFO L82 PathProgramCache]: Analyzing trace with hash 327811634, now seen corresponding path program 38 times [2019-10-14 21:47:05,263 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:05,263 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571909975] [2019-10-14 21:47:05,263 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:05,264 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:05,264 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:05,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat