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-industry-pattern/array_single_elem_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:47:49,259 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:47:49,261 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:47:49,274 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:47:49,274 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:47:49,275 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:47:49,277 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:47:49,279 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:47:49,280 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:47:49,281 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:47:49,282 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:47:49,283 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:47:49,284 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:47:49,285 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:47:49,286 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:47:49,287 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:47:49,288 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:47:49,291 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:47:49,293 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:47:49,299 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:47:49,300 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:47:49,303 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:47:49,304 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:47:49,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:47:49,308 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:47:49,314 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:47:49,316 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:47:49,317 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:47:49,318 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:47:49,322 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:47:49,322 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:47:49,323 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:47:49,323 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:47:49,323 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:47:49,324 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:47:49,328 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:47:49,329 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 21:47:49,348 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:47:49,348 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:47:49,350 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:47:49,350 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:47:49,351 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:47:49,351 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:47:49,351 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:47:49,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:47:49,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:47:49,352 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:47:49,353 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:47:49,353 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:47:49,353 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:47:49,354 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:47:49,354 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:47:49,354 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:47:49,354 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:47:49,354 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:47:49,355 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:47:49,355 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:47:49,355 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:47:49,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:47:49,355 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:47:49,356 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:47:49,630 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:47:49,648 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:47:49,652 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:47:49,654 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:47:49,654 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:47:49,655 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_single_elem_init.i [2019-10-14 21:47:49,731 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca347dca9/4e0b82d156564e03aab73e2667d740bf/FLAG9d85b94bc [2019-10-14 21:47:50,192 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:47:50,193 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/array_single_elem_init.i [2019-10-14 21:47:50,200 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca347dca9/4e0b82d156564e03aab73e2667d740bf/FLAG9d85b94bc [2019-10-14 21:47:50,541 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca347dca9/4e0b82d156564e03aab73e2667d740bf [2019-10-14 21:47:50,551 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:47:50,553 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:47:50,554 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:50,555 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:47:50,558 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:47:50,560 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:50,563 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@799252b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50, skipping insertion in model container [2019-10-14 21:47:50,563 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:50,570 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:47:50,587 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:47:50,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:50,853 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:47:50,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:50,912 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:47:50,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50 WrapperNode [2019-10-14 21:47:50,914 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:50,915 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:47:50,915 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:47:50,915 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:47:51,038 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,038 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,049 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,051 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,072 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,078 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (1/1) ... [2019-10-14 21:47:51,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:47:51,088 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:47:51,088 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:47:51,088 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:47:51,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (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 21:47:51,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:47:51,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:47:51,149 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:47:51,149 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:47:51,149 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:47:51,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:47:51,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:47:51,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:47:51,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:47:51,422 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:47:51,423 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-14 21:47:51,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:51 BoogieIcfgContainer [2019-10-14 21:47:51,425 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:47:51,426 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:47:51,426 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:47:51,429 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:47:51,430 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:47:50" (1/3) ... [2019-10-14 21:47:51,431 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14598f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:51, skipping insertion in model container [2019-10-14 21:47:51,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:50" (2/3) ... [2019-10-14 21:47:51,432 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14598f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:51, skipping insertion in model container [2019-10-14 21:47:51,432 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:51" (3/3) ... [2019-10-14 21:47:51,434 INFO L109 eAbstractionObserver]: Analyzing ICFG array_single_elem_init.i [2019-10-14 21:47:51,445 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:47:51,466 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:47:51,492 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:47:51,554 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:47:51,554 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:47:51,555 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:47:51,555 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:47:51,555 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:47:51,555 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:47:51,555 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:47:51,555 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:47:51,576 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-10-14 21:47:51,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:47:51,584 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:51,586 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:51,588 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:51,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:51,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1656037931, now seen corresponding path program 1 times [2019-10-14 21:47:51,606 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:51,607 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157421088] [2019-10-14 21:47:51,609 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,610 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:51,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:51,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:51,786 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 21:47:51,787 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157421088] [2019-10-14 21:47:51,788 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:51,788 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:47:51,789 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738127807] [2019-10-14 21:47:51,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:47:51,794 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:51,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:47:51,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:51,811 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-10-14 21:47:51,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:51,923 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2019-10-14 21:47:51,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:47:51,925 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-14 21:47:51,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:51,935 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:47:51,936 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:47:51,942 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 21:47:51,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:47:51,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-14 21:47:51,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:47:51,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-10-14 21:47:51,982 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 14 [2019-10-14 21:47:51,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:51,982 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-10-14 21:47:51,983 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:47:51,983 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-10-14 21:47:51,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:47:51,984 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:51,984 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:51,985 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:51,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:51,985 INFO L82 PathProgramCache]: Analyzing trace with hash -533813011, now seen corresponding path program 1 times [2019-10-14 21:47:51,986 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:51,986 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061175515] [2019-10-14 21:47:51,986 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,986 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,987 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:52,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,091 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 21:47:52,091 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061175515] [2019-10-14 21:47:52,092 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:52,092 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:47:52,092 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918413773] [2019-10-14 21:47:52,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:52,094 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:52,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:52,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:52,098 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2019-10-14 21:47:52,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:52,230 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2019-10-14 21:47:52,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:52,230 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-10-14 21:47:52,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:52,232 INFO L225 Difference]: With dead ends: 45 [2019-10-14 21:47:52,232 INFO L226 Difference]: Without dead ends: 33 [2019-10-14 21:47:52,233 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 21:47:52,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-14 21:47:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2019-10-14 21:47:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 21:47:52,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-10-14 21:47:52,242 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 14 [2019-10-14 21:47:52,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:52,243 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-10-14 21:47:52,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:52,243 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-10-14 21:47:52,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 21:47:52,244 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:52,245 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:52,245 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:52,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:52,246 INFO L82 PathProgramCache]: Analyzing trace with hash -414258795, now seen corresponding path program 1 times [2019-10-14 21:47:52,246 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:52,246 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485127890] [2019-10-14 21:47:52,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,247 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:52,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:47:52,363 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485127890] [2019-10-14 21:47:52,363 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146278455] [2019-10-14 21:47:52,366 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 21:47:52,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,453 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:47:52,460 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:52,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:52,494 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:52,494 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:47:52,494 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920921093] [2019-10-14 21:47:52,495 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:47:52,495 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:52,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:47:52,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:52,497 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 6 states. [2019-10-14 21:47:52,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:52,644 INFO L93 Difference]: Finished difference Result 56 states and 70 transitions. [2019-10-14 21:47:52,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:47:52,644 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-10-14 21:47:52,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:52,646 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:47:52,646 INFO L226 Difference]: Without dead ends: 42 [2019-10-14 21:47:52,647 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:52,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-14 21:47:52,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2019-10-14 21:47:52,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-14 21:47:52,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2019-10-14 21:47:52,662 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 22 [2019-10-14 21:47:52,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:52,675 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2019-10-14 21:47:52,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:47:52,676 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2019-10-14 21:47:52,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-14 21:47:52,677 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:52,677 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:52,882 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,887 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:52,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:52,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1579249427, now seen corresponding path program 2 times [2019-10-14 21:47:52,888 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:52,888 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336226445] [2019-10-14 21:47:52,888 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,889 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,889 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:52,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,010 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:47:53,011 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336226445] [2019-10-14 21:47:53,011 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570028387] [2019-10-14 21:47:53,011 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 21:47:53,073 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:53,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:53,074 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:47:53,078 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:47:53,111 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:53,111 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:47:53,112 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974200783] [2019-10-14 21:47:53,112 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:47:53,112 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:53,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:47:53,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:53,114 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 7 states. [2019-10-14 21:47:53,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:53,250 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2019-10-14 21:47:53,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:47:53,251 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-10-14 21:47:53,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:53,252 INFO L225 Difference]: With dead ends: 68 [2019-10-14 21:47:53,252 INFO L226 Difference]: Without dead ends: 51 [2019-10-14 21:47:53,253 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:53,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-10-14 21:47:53,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2019-10-14 21:47:53,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-14 21:47:53,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 56 transitions. [2019-10-14 21:47:53,261 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 56 transitions. Word has length 30 [2019-10-14 21:47:53,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:53,261 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 56 transitions. [2019-10-14 21:47:53,261 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:47:53,261 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 56 transitions. [2019-10-14 21:47:53,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-14 21:47:53,262 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:53,263 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:53,466 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:53,467 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:53,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:53,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1850469483, now seen corresponding path program 3 times [2019-10-14 21:47:53,468 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:53,468 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887571927] [2019-10-14 21:47:53,468 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,468 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,468 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:53,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,614 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:47:53,616 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887571927] [2019-10-14 21:47:53,617 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558373994] [2019-10-14 21:47:53,617 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 21:47:53,689 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 21:47:53,689 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:53,690 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:47:53,696 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:53,768 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:53,769 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 27 [2019-10-14 21:47:53,770 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:53,776 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:53,777 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:53,778 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:20, output treesize:4 [2019-10-14 21:47:53,815 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-14 21:47:53,825 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 40 [2019-10-14 21:47:53,826 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:53,876 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:53,893 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 33 [2019-10-14 21:47:53,894 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:53,907 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 34 [2019-10-14 21:47:53,907 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:53,949 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:53,952 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-2 vars, End of recursive call: 6 dim-0 vars, and 3 xjuncts. [2019-10-14 21:47:53,952 INFO L221 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:159, output treesize:108 [2019-10-14 21:47:54,021 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-10-14 21:47:54,038 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 19 [2019-10-14 21:47:54,039 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,045 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 21 [2019-10-14 21:47:54,046 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,051 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 27 [2019-10-14 21:47:54,052 INFO L496 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,082 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:54,087 INFO L496 ElimStorePlain]: Start of recursive call 1: 9 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,087 INFO L221 ElimStorePlain]: Needed 4 recursive calls to eliminate 10 variables, input treesize:140, output treesize:3 [2019-10-14 21:47:54,107 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-14 21:47:54,107 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:54,107 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2019-10-14 21:47:54,108 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102516636] [2019-10-14 21:47:54,108 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:47:54,109 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:54,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:47:54,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:54,110 INFO L87 Difference]: Start difference. First operand 45 states and 56 transitions. Second operand 10 states. [2019-10-14 21:47:55,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:55,093 INFO L93 Difference]: Finished difference Result 109 states and 146 transitions. [2019-10-14 21:47:55,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:47:55,098 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 38 [2019-10-14 21:47:55,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:55,101 INFO L225 Difference]: With dead ends: 109 [2019-10-14 21:47:55,101 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:47:55,102 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:47:55,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:47:55,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2019-10-14 21:47:55,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-14 21:47:55,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2019-10-14 21:47:55,111 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 38 [2019-10-14 21:47:55,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:55,111 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2019-10-14 21:47:55,111 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:47:55,111 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2019-10-14 21:47:55,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-14 21:47:55,113 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:55,113 INFO L380 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:55,324 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:55,325 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:55,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:55,326 INFO L82 PathProgramCache]: Analyzing trace with hash 304191085, now seen corresponding path program 1 times [2019-10-14 21:47:55,326 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:55,326 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36942189] [2019-10-14 21:47:55,327 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:55,327 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:55,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:55,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:55,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:55,450 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-10-14 21:47:55,450 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36942189] [2019-10-14 21:47:55,451 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205198694] [2019-10-14 21:47:55,451 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:47:55,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:55,499 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:47:55,503 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:55,520 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-14 21:47:55,521 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:55,521 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:47:55,521 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478418303] [2019-10-14 21:47:55,522 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:47:55,522 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:55,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:47:55,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:47:55,523 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand 9 states. [2019-10-14 21:47:55,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:55,734 INFO L93 Difference]: Finished difference Result 104 states and 127 transitions. [2019-10-14 21:47:55,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:47:55,735 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2019-10-14 21:47:55,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:55,736 INFO L225 Difference]: With dead ends: 104 [2019-10-14 21:47:55,737 INFO L226 Difference]: Without dead ends: 81 [2019-10-14 21:47:55,737 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:47:55,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-10-14 21:47:55,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2019-10-14 21:47:55,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-14 21:47:55,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2019-10-14 21:47:55,752 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 46 [2019-10-14 21:47:55,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:55,753 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2019-10-14 21:47:55,753 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:47:55,753 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2019-10-14 21:47:55,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-10-14 21:47:55,757 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:55,757 INFO L380 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:55,965 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:55,966 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:55,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:55,967 INFO L82 PathProgramCache]: Analyzing trace with hash -828408681, now seen corresponding path program 2 times [2019-10-14 21:47:55,967 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:55,968 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325289478] [2019-10-14 21:47:55,968 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:55,969 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:55,969 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:55,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:56,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:56,058 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-14 21:47:56,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325289478] [2019-10-14 21:47:56,059 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330745340] [2019-10-14 21:47:56,059 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 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 21:47:56,116 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:56,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:56,118 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:47:56,120 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:56,151 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-14 21:47:56,151 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:56,151 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:47:56,152 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120279022] [2019-10-14 21:47:56,152 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:47:56,153 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:56,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:47:56,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:56,153 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand 10 states. [2019-10-14 21:47:56,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:56,312 INFO L93 Difference]: Finished difference Result 118 states and 144 transitions. [2019-10-14 21:47:56,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:47:56,313 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2019-10-14 21:47:56,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:56,314 INFO L225 Difference]: With dead ends: 118 [2019-10-14 21:47:56,314 INFO L226 Difference]: Without dead ends: 92 [2019-10-14 21:47:56,315 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:56,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-14 21:47:56,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 84. [2019-10-14 21:47:56,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-10-14 21:47:56,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 104 transitions. [2019-10-14 21:47:56,324 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 104 transitions. Word has length 54 [2019-10-14 21:47:56,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:56,325 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 104 transitions. [2019-10-14 21:47:56,325 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:47:56,325 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 104 transitions. [2019-10-14 21:47:56,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:47:56,326 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:56,326 INFO L380 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:56,530 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:56,530 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:56,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:56,531 INFO L82 PathProgramCache]: Analyzing trace with hash 893310253, now seen corresponding path program 3 times [2019-10-14 21:47:56,531 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:56,531 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645857891] [2019-10-14 21:47:56,531 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:56,531 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:56,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:56,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:56,632 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:47:56,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645857891] [2019-10-14 21:47:56,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847713295] [2019-10-14 21:47:56,633 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 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 21:47:56,697 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-10-14 21:47:56,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:56,699 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:47:56,702 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:56,725 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:47:56,726 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:56,726 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:47:56,726 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563996120] [2019-10-14 21:47:56,727 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:47:56,727 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:56,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:47:56,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:56,728 INFO L87 Difference]: Start difference. First operand 84 states and 104 transitions. Second operand 11 states. [2019-10-14 21:47:56,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:56,914 INFO L93 Difference]: Finished difference Result 132 states and 161 transitions. [2019-10-14 21:47:56,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:47:56,914 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2019-10-14 21:47:56,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:56,915 INFO L225 Difference]: With dead ends: 132 [2019-10-14 21:47:56,915 INFO L226 Difference]: Without dead ends: 103 [2019-10-14 21:47:56,916 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:47:56,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-10-14 21:47:56,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 95. [2019-10-14 21:47:56,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-10-14 21:47:56,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2019-10-14 21:47:56,926 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 62 [2019-10-14 21:47:56,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:56,926 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2019-10-14 21:47:56,926 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:47:56,926 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2019-10-14 21:47:56,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-10-14 21:47:56,928 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:56,928 INFO L380 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:57,139 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:57,140 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:57,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:57,141 INFO L82 PathProgramCache]: Analyzing trace with hash -615935017, now seen corresponding path program 4 times [2019-10-14 21:47:57,141 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:57,141 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359053579] [2019-10-14 21:47:57,141 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:57,142 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:57,142 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:57,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:57,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:57,283 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-10-14 21:47:57,283 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359053579] [2019-10-14 21:47:57,284 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754601773] [2019-10-14 21:47:57,284 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 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 21:47:57,345 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:57,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:57,346 INFO L256 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:47:57,349 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:57,371 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-10-14 21:47:57,371 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:57,371 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:47:57,371 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986683254] [2019-10-14 21:47:57,372 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:47:57,372 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:57,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:47:57,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:47:57,373 INFO L87 Difference]: Start difference. First operand 95 states and 118 transitions. Second operand 12 states. [2019-10-14 21:47:57,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:57,579 INFO L93 Difference]: Finished difference Result 146 states and 178 transitions. [2019-10-14 21:47:57,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:47:57,579 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2019-10-14 21:47:57,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:57,581 INFO L225 Difference]: With dead ends: 146 [2019-10-14 21:47:57,581 INFO L226 Difference]: Without dead ends: 114 [2019-10-14 21:47:57,582 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:47:57,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-14 21:47:57,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2019-10-14 21:47:57,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-10-14 21:47:57,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 132 transitions. [2019-10-14 21:47:57,593 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 132 transitions. Word has length 70 [2019-10-14 21:47:57,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:57,593 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 132 transitions. [2019-10-14 21:47:57,593 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:47:57,593 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 132 transitions. [2019-10-14 21:47:57,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-10-14 21:47:57,597 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:57,597 INFO L380 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:57,797 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:57,798 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:57,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:57,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1889092589, now seen corresponding path program 5 times [2019-10-14 21:47:57,799 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:57,799 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241079218] [2019-10-14 21:47:57,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:57,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:57,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:57,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:57,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:57,913 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-10-14 21:47:57,913 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241079218] [2019-10-14 21:47:57,914 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654756698] [2019-10-14 21:47:57,914 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 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 21:47:58,003 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2019-10-14 21:47:58,003 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:58,005 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:47:58,008 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:58,036 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-10-14 21:47:58,037 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:58,037 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:47:58,037 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818513699] [2019-10-14 21:47:58,038 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:47:58,038 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:58,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:47:58,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:47:58,039 INFO L87 Difference]: Start difference. First operand 106 states and 132 transitions. Second operand 13 states. [2019-10-14 21:47:58,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:58,310 INFO L93 Difference]: Finished difference Result 160 states and 195 transitions. [2019-10-14 21:47:58,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:47:58,310 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2019-10-14 21:47:58,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:58,313 INFO L225 Difference]: With dead ends: 160 [2019-10-14 21:47:58,314 INFO L226 Difference]: Without dead ends: 125 [2019-10-14 21:47:58,315 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:47:58,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-10-14 21:47:58,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 117. [2019-10-14 21:47:58,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2019-10-14 21:47:58,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 146 transitions. [2019-10-14 21:47:58,339 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 146 transitions. Word has length 78 [2019-10-14 21:47:58,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:58,339 INFO L462 AbstractCegarLoop]: Abstraction has 117 states and 146 transitions. [2019-10-14 21:47:58,340 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:47:58,340 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 146 transitions. [2019-10-14 21:47:58,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-14 21:47:58,344 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:58,344 INFO L380 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:58,545 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:58,545 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:58,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:58,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1861453033, now seen corresponding path program 6 times [2019-10-14 21:47:58,546 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:58,546 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524358061] [2019-10-14 21:47:58,546 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:58,546 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:58,547 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:58,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:58,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:58,666 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2019-10-14 21:47:58,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524358061] [2019-10-14 21:47:58,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160859138] [2019-10-14 21:47:58,667 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 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 21:47:58,788 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2019-10-14 21:47:58,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:58,789 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:47:58,792 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:58,814 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2019-10-14 21:47:58,815 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:58,815 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:47:58,815 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141487353] [2019-10-14 21:47:58,816 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:47:58,817 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:58,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:47:58,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:58,817 INFO L87 Difference]: Start difference. First operand 117 states and 146 transitions. Second operand 14 states. [2019-10-14 21:47:59,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:59,050 INFO L93 Difference]: Finished difference Result 174 states and 212 transitions. [2019-10-14 21:47:59,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:47:59,050 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 86 [2019-10-14 21:47:59,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:59,051 INFO L225 Difference]: With dead ends: 174 [2019-10-14 21:47:59,051 INFO L226 Difference]: Without dead ends: 136 [2019-10-14 21:47:59,052 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:59,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2019-10-14 21:47:59,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 128. [2019-10-14 21:47:59,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2019-10-14 21:47:59,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 160 transitions. [2019-10-14 21:47:59,059 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 160 transitions. Word has length 86 [2019-10-14 21:47:59,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:59,060 INFO L462 AbstractCegarLoop]: Abstraction has 128 states and 160 transitions. [2019-10-14 21:47:59,060 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:47:59,060 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 160 transitions. [2019-10-14 21:47:59,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2019-10-14 21:47:59,061 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:59,061 INFO L380 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:59,266 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:59,266 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:59,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:59,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1223892307, now seen corresponding path program 7 times [2019-10-14 21:47:59,267 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:59,267 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884826235] [2019-10-14 21:47:59,267 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:59,267 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:59,267 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:59,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:59,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:59,433 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2019-10-14 21:47:59,433 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884826235] [2019-10-14 21:47:59,436 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1644345688] [2019-10-14 21:47:59,436 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 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 21:47:59,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:59,500 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:47:59,508 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:59,538 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-10-14 21:47:59,539 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:59,539 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:47:59,539 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915800078] [2019-10-14 21:47:59,540 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:47:59,540 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:59,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:47:59,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:59,541 INFO L87 Difference]: Start difference. First operand 128 states and 160 transitions. Second operand 15 states. [2019-10-14 21:47:59,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:59,822 INFO L93 Difference]: Finished difference Result 188 states and 229 transitions. [2019-10-14 21:47:59,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:47:59,823 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 94 [2019-10-14 21:47:59,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:59,824 INFO L225 Difference]: With dead ends: 188 [2019-10-14 21:47:59,824 INFO L226 Difference]: Without dead ends: 147 [2019-10-14 21:47:59,825 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2019-10-14 21:47:59,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 139. [2019-10-14 21:47:59,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2019-10-14 21:47:59,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 174 transitions. [2019-10-14 21:47:59,842 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 174 transitions. Word has length 94 [2019-10-14 21:47:59,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:59,842 INFO L462 AbstractCegarLoop]: Abstraction has 139 states and 174 transitions. [2019-10-14 21:47:59,843 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:47:59,843 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 174 transitions. [2019-10-14 21:47:59,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-14 21:47:59,844 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:59,844 INFO L380 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:00,057 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:00,058 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:00,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:00,058 INFO L82 PathProgramCache]: Analyzing trace with hash -141807017, now seen corresponding path program 8 times [2019-10-14 21:48:00,058 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:00,058 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420462290] [2019-10-14 21:48:00,058 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:00,059 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:00,059 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:00,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:00,236 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2019-10-14 21:48:00,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420462290] [2019-10-14 21:48:00,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485620995] [2019-10-14 21:48:00,236 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 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 21:48:00,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:48:00,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:00,295 INFO L256 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:48:00,298 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:00,322 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 0 proven. 286 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-10-14 21:48:00,322 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:00,322 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:48:00,323 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655677296] [2019-10-14 21:48:00,323 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:48:00,324 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:00,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:48:00,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:48:00,324 INFO L87 Difference]: Start difference. First operand 139 states and 174 transitions. Second operand 16 states. [2019-10-14 21:48:00,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:00,605 INFO L93 Difference]: Finished difference Result 202 states and 246 transitions. [2019-10-14 21:48:00,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:48:00,606 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 102 [2019-10-14 21:48:00,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:00,607 INFO L225 Difference]: With dead ends: 202 [2019-10-14 21:48:00,608 INFO L226 Difference]: Without dead ends: 158 [2019-10-14 21:48:00,609 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:48:00,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2019-10-14 21:48:00,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 150. [2019-10-14 21:48:00,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2019-10-14 21:48:00,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 188 transitions. [2019-10-14 21:48:00,616 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 188 transitions. Word has length 102 [2019-10-14 21:48:00,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:00,617 INFO L462 AbstractCegarLoop]: Abstraction has 150 states and 188 transitions. [2019-10-14 21:48:00,617 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:48:00,617 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 188 transitions. [2019-10-14 21:48:00,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2019-10-14 21:48:00,619 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:00,619 INFO L380 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:00,828 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:00,829 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:00,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:00,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1718989165, now seen corresponding path program 9 times [2019-10-14 21:48:00,830 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:00,830 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977086417] [2019-10-14 21:48:00,830 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:00,830 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:00,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:00,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:00,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:01,005 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2019-10-14 21:48:01,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977086417] [2019-10-14 21:48:01,006 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557926558] [2019-10-14 21:48:01,006 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 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 21:48:01,178 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2019-10-14 21:48:01,178 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:01,180 INFO L256 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:48:01,182 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:01,211 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-14 21:48:01,212 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:01,212 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:48:01,217 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126170602] [2019-10-14 21:48:01,218 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:48:01,218 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:01,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:48:01,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:48:01,220 INFO L87 Difference]: Start difference. First operand 150 states and 188 transitions. Second operand 17 states. [2019-10-14 21:48:01,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:01,501 INFO L93 Difference]: Finished difference Result 216 states and 263 transitions. [2019-10-14 21:48:01,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:48:01,501 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 110 [2019-10-14 21:48:01,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:01,503 INFO L225 Difference]: With dead ends: 216 [2019-10-14 21:48:01,503 INFO L226 Difference]: Without dead ends: 169 [2019-10-14 21:48:01,505 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:48:01,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2019-10-14 21:48:01,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 161. [2019-10-14 21:48:01,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2019-10-14 21:48:01,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 202 transitions. [2019-10-14 21:48:01,513 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 202 transitions. Word has length 110 [2019-10-14 21:48:01,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:01,514 INFO L462 AbstractCegarLoop]: Abstraction has 161 states and 202 transitions. [2019-10-14 21:48:01,514 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:48:01,514 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 202 transitions. [2019-10-14 21:48:01,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-10-14 21:48:01,516 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:01,516 INFO L380 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:01,723 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:01,723 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:01,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:01,723 INFO L82 PathProgramCache]: Analyzing trace with hash -882067049, now seen corresponding path program 10 times [2019-10-14 21:48:01,723 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:01,724 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242388548] [2019-10-14 21:48:01,724 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:01,724 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:01,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:01,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:01,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:01,918 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2019-10-14 21:48:01,919 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242388548] [2019-10-14 21:48:01,919 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328467482] [2019-10-14 21:48:01,919 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 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 21:48:01,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:48:01,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:01,995 INFO L256 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:48:01,997 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:02,036 INFO L134 CoverageAnalysis]: Checked inductivity of 663 backedges. 0 proven. 403 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-10-14 21:48:02,037 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:02,037 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:48:02,037 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496304899] [2019-10-14 21:48:02,038 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:48:02,038 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:02,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:48:02,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:48:02,039 INFO L87 Difference]: Start difference. First operand 161 states and 202 transitions. Second operand 18 states. [2019-10-14 21:48:02,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:02,288 INFO L93 Difference]: Finished difference Result 230 states and 280 transitions. [2019-10-14 21:48:02,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:48:02,289 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 118 [2019-10-14 21:48:02,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:02,290 INFO L225 Difference]: With dead ends: 230 [2019-10-14 21:48:02,290 INFO L226 Difference]: Without dead ends: 180 [2019-10-14 21:48:02,291 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:48:02,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-10-14 21:48:02,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 172. [2019-10-14 21:48:02,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-10-14 21:48:02,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 216 transitions. [2019-10-14 21:48:02,296 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 216 transitions. Word has length 118 [2019-10-14 21:48:02,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:02,296 INFO L462 AbstractCegarLoop]: Abstraction has 172 states and 216 transitions. [2019-10-14 21:48:02,297 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:48:02,297 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 216 transitions. [2019-10-14 21:48:02,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-10-14 21:48:02,298 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:02,298 INFO L380 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:02,509 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:02,509 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:02,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:02,510 INFO L82 PathProgramCache]: Analyzing trace with hash 128954413, now seen corresponding path program 11 times [2019-10-14 21:48:02,510 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:02,511 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133696515] [2019-10-14 21:48:02,511 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:02,511 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:02,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:02,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:02,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:02,709 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2019-10-14 21:48:02,709 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133696515] [2019-10-14 21:48:02,710 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067926300] [2019-10-14 21:48:02,710 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 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 21:48:02,829 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-10-14 21:48:02,829 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:02,831 INFO L256 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:48:02,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2019-10-14 21:48:02,871 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:02,871 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:48:02,871 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706586531] [2019-10-14 21:48:02,872 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:48:02,872 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:02,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:48:02,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:48:02,872 INFO L87 Difference]: Start difference. First operand 172 states and 216 transitions. Second operand 19 states. [2019-10-14 21:48:03,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:03,149 INFO L93 Difference]: Finished difference Result 244 states and 297 transitions. [2019-10-14 21:48:03,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:48:03,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 126 [2019-10-14 21:48:03,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:03,152 INFO L225 Difference]: With dead ends: 244 [2019-10-14 21:48:03,152 INFO L226 Difference]: Without dead ends: 191 [2019-10-14 21:48:03,153 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:48:03,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-10-14 21:48:03,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 183. [2019-10-14 21:48:03,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-10-14 21:48:03,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 230 transitions. [2019-10-14 21:48:03,160 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 230 transitions. Word has length 126 [2019-10-14 21:48:03,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:03,160 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 230 transitions. [2019-10-14 21:48:03,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:48:03,160 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 230 transitions. [2019-10-14 21:48:03,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-10-14 21:48:03,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:03,162 INFO L380 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:03,366 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:03,366 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:03,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:03,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1101917993, now seen corresponding path program 12 times [2019-10-14 21:48:03,367 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:03,368 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518073332] [2019-10-14 21:48:03,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:03,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:03,368 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:03,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:03,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2019-10-14 21:48:03,557 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518073332] [2019-10-14 21:48:03,557 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355253402] [2019-10-14 21:48:03,557 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 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 21:48:03,791 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2019-10-14 21:48:03,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:03,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:48:03,796 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:03,837 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2019-10-14 21:48:03,837 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:03,837 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:48:03,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139820643] [2019-10-14 21:48:03,838 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:48:03,838 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:03,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:48:03,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:48:03,839 INFO L87 Difference]: Start difference. First operand 183 states and 230 transitions. Second operand 20 states. [2019-10-14 21:48:04,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:04,208 INFO L93 Difference]: Finished difference Result 258 states and 314 transitions. [2019-10-14 21:48:04,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:48:04,208 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 134 [2019-10-14 21:48:04,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:04,210 INFO L225 Difference]: With dead ends: 258 [2019-10-14 21:48:04,210 INFO L226 Difference]: Without dead ends: 202 [2019-10-14 21:48:04,212 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:48:04,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2019-10-14 21:48:04,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 194. [2019-10-14 21:48:04,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2019-10-14 21:48:04,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 244 transitions. [2019-10-14 21:48:04,219 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 244 transitions. Word has length 134 [2019-10-14 21:48:04,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:04,219 INFO L462 AbstractCegarLoop]: Abstraction has 194 states and 244 transitions. [2019-10-14 21:48:04,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:48:04,219 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 244 transitions. [2019-10-14 21:48:04,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2019-10-14 21:48:04,220 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:04,221 INFO L380 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:04,425 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:04,425 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:04,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:04,426 INFO L82 PathProgramCache]: Analyzing trace with hash 244768493, now seen corresponding path program 13 times [2019-10-14 21:48:04,426 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:04,426 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139570983] [2019-10-14 21:48:04,426 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:04,426 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:04,426 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:04,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:04,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:04,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2019-10-14 21:48:04,632 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139570983] [2019-10-14 21:48:04,633 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964039620] [2019-10-14 21:48:04,633 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 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 21:48:04,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:04,720 INFO L256 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:48:04,722 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:04,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 616 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-14 21:48:04,771 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:04,771 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:48:04,771 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12568184] [2019-10-14 21:48:04,772 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:48:04,772 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:04,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:48:04,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:48:04,773 INFO L87 Difference]: Start difference. First operand 194 states and 244 transitions. Second operand 21 states. [2019-10-14 21:48:05,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:05,071 INFO L93 Difference]: Finished difference Result 272 states and 331 transitions. [2019-10-14 21:48:05,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:48:05,072 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 142 [2019-10-14 21:48:05,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:05,074 INFO L225 Difference]: With dead ends: 272 [2019-10-14 21:48:05,074 INFO L226 Difference]: Without dead ends: 213 [2019-10-14 21:48:05,075 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:48:05,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2019-10-14 21:48:05,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 205. [2019-10-14 21:48:05,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-10-14 21:48:05,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 258 transitions. [2019-10-14 21:48:05,082 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 258 transitions. Word has length 142 [2019-10-14 21:48:05,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:05,083 INFO L462 AbstractCegarLoop]: Abstraction has 205 states and 258 transitions. [2019-10-14 21:48:05,083 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:48:05,083 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 258 transitions. [2019-10-14 21:48:05,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2019-10-14 21:48:05,084 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:05,084 INFO L380 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:05,293 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:05,294 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:05,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:05,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1226819561, now seen corresponding path program 14 times [2019-10-14 21:48:05,295 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:05,295 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669675433] [2019-10-14 21:48:05,295 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:05,296 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:05,296 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:05,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:05,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:05,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 697 trivial. 0 not checked. [2019-10-14 21:48:05,569 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669675433] [2019-10-14 21:48:05,569 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474886050] [2019-10-14 21:48:05,569 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 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 21:48:05,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:48:05,667 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:05,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:48:05,669 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:05,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1139 backedges. 0 proven. 697 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2019-10-14 21:48:05,699 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:05,699 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:48:05,699 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407440077] [2019-10-14 21:48:05,700 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:48:05,712 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:05,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:48:05,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:48:05,713 INFO L87 Difference]: Start difference. First operand 205 states and 258 transitions. Second operand 22 states. [2019-10-14 21:48:06,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:06,077 INFO L93 Difference]: Finished difference Result 286 states and 348 transitions. [2019-10-14 21:48:06,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:48:06,078 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 150 [2019-10-14 21:48:06,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:06,079 INFO L225 Difference]: With dead ends: 286 [2019-10-14 21:48:06,079 INFO L226 Difference]: Without dead ends: 224 [2019-10-14 21:48:06,080 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:48:06,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2019-10-14 21:48:06,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 216. [2019-10-14 21:48:06,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2019-10-14 21:48:06,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 272 transitions. [2019-10-14 21:48:06,087 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 272 transitions. Word has length 150 [2019-10-14 21:48:06,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:06,088 INFO L462 AbstractCegarLoop]: Abstraction has 216 states and 272 transitions. [2019-10-14 21:48:06,088 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:48:06,088 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 272 transitions. [2019-10-14 21:48:06,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2019-10-14 21:48:06,089 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:06,089 INFO L380 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:06,301 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:06,301 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:06,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:06,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1710801491, now seen corresponding path program 15 times [2019-10-14 21:48:06,302 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:06,302 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648989412] [2019-10-14 21:48:06,303 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:06,303 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:06,303 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:06,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:06,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:06,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1278 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 783 trivial. 0 not checked. [2019-10-14 21:48:06,634 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648989412] [2019-10-14 21:48:06,634 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368120922] [2019-10-14 21:48:06,635 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 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 21:48:07,329 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2019-10-14 21:48:07,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:07,333 INFO L256 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:48:07,335 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:07,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1278 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 783 trivial. 0 not checked. [2019-10-14 21:48:07,371 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:07,371 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 21:48:07,372 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689376493] [2019-10-14 21:48:07,373 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:48:07,374 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:07,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:48:07,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:48:07,375 INFO L87 Difference]: Start difference. First operand 216 states and 272 transitions. Second operand 23 states. [2019-10-14 21:48:07,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:07,747 INFO L93 Difference]: Finished difference Result 300 states and 365 transitions. [2019-10-14 21:48:07,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:48:07,747 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 158 [2019-10-14 21:48:07,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:07,749 INFO L225 Difference]: With dead ends: 300 [2019-10-14 21:48:07,749 INFO L226 Difference]: Without dead ends: 235 [2019-10-14 21:48:07,749 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:48:07,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2019-10-14 21:48:07,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 227. [2019-10-14 21:48:07,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2019-10-14 21:48:07,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 286 transitions. [2019-10-14 21:48:07,763 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 286 transitions. Word has length 158 [2019-10-14 21:48:07,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:07,764 INFO L462 AbstractCegarLoop]: Abstraction has 227 states and 286 transitions. [2019-10-14 21:48:07,764 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:48:07,764 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 286 transitions. [2019-10-14 21:48:07,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2019-10-14 21:48:07,765 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:07,765 INFO L380 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:07,978 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:07,978 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:07,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:07,979 INFO L82 PathProgramCache]: Analyzing trace with hash 280702807, now seen corresponding path program 16 times [2019-10-14 21:48:07,979 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:07,980 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637510349] [2019-10-14 21:48:07,980 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:07,980 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:07,981 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:08,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:08,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 874 trivial. 0 not checked. [2019-10-14 21:48:08,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637510349] [2019-10-14 21:48:08,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957977372] [2019-10-14 21:48:08,329 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:08,429 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:48:08,429 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:08,431 INFO L256 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-14 21:48:08,435 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:08,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1425 backedges. 0 proven. 874 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2019-10-14 21:48:08,478 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:08,478 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-14 21:48:08,478 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454119238] [2019-10-14 21:48:08,479 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-14 21:48:08,479 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:08,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-14 21:48:08,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:48:08,481 INFO L87 Difference]: Start difference. First operand 227 states and 286 transitions. Second operand 24 states. [2019-10-14 21:48:08,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:08,982 INFO L93 Difference]: Finished difference Result 314 states and 382 transitions. [2019-10-14 21:48:08,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:48:08,983 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2019-10-14 21:48:08,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:08,985 INFO L225 Difference]: With dead ends: 314 [2019-10-14 21:48:08,985 INFO L226 Difference]: Without dead ends: 246 [2019-10-14 21:48:08,986 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:48:08,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2019-10-14 21:48:08,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 238. [2019-10-14 21:48:08,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-10-14 21:48:08,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 300 transitions. [2019-10-14 21:48:08,997 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 300 transitions. Word has length 166 [2019-10-14 21:48:08,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:08,998 INFO L462 AbstractCegarLoop]: Abstraction has 238 states and 300 transitions. [2019-10-14 21:48:08,998 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-14 21:48:08,998 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 300 transitions. [2019-10-14 21:48:09,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2019-10-14 21:48:09,000 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:09,001 INFO L380 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:09,206 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:09,206 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:09,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:09,206 INFO L82 PathProgramCache]: Analyzing trace with hash 870108269, now seen corresponding path program 17 times [2019-10-14 21:48:09,207 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:09,207 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674835506] [2019-10-14 21:48:09,207 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:09,207 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:09,207 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:09,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:09,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1580 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 970 trivial. 0 not checked. [2019-10-14 21:48:09,612 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674835506] [2019-10-14 21:48:09,612 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672032911] [2019-10-14 21:48:09,612 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:09,965 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-10-14 21:48:09,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:09,968 INFO L256 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-14 21:48:09,970 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:10,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1580 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 970 trivial. 0 not checked. [2019-10-14 21:48:10,009 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:10,009 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-14 21:48:10,009 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049206213] [2019-10-14 21:48:10,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:48:10,010 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:10,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:48:10,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:48:10,011 INFO L87 Difference]: Start difference. First operand 238 states and 300 transitions. Second operand 25 states. [2019-10-14 21:48:10,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:10,517 INFO L93 Difference]: Finished difference Result 328 states and 399 transitions. [2019-10-14 21:48:10,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-14 21:48:10,519 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 174 [2019-10-14 21:48:10,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:10,521 INFO L225 Difference]: With dead ends: 328 [2019-10-14 21:48:10,521 INFO L226 Difference]: Without dead ends: 257 [2019-10-14 21:48:10,522 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:48:10,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2019-10-14 21:48:10,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 249. [2019-10-14 21:48:10,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2019-10-14 21:48:10,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 314 transitions. [2019-10-14 21:48:10,531 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 314 transitions. Word has length 174 [2019-10-14 21:48:10,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:10,532 INFO L462 AbstractCegarLoop]: Abstraction has 249 states and 314 transitions. [2019-10-14 21:48:10,532 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:48:10,532 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 314 transitions. [2019-10-14 21:48:10,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2019-10-14 21:48:10,533 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:10,533 INFO L380 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:10,740 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:10,740 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:10,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:10,740 INFO L82 PathProgramCache]: Analyzing trace with hash -595134825, now seen corresponding path program 18 times [2019-10-14 21:48:10,741 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:10,741 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819498823] [2019-10-14 21:48:10,741 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:10,741 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:10,741 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:10,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:11,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:11,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2019-10-14 21:48:11,214 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819498823] [2019-10-14 21:48:11,214 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800808659] [2019-10-14 21:48:11,214 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:12,635 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2019-10-14 21:48:12,635 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:12,640 INFO L256 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 21:48:12,643 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:12,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1743 backedges. 0 proven. 1071 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2019-10-14 21:48:12,702 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:12,702 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-10-14 21:48:12,702 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508405753] [2019-10-14 21:48:12,705 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 21:48:12,705 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:12,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 21:48:12,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:48:12,706 INFO L87 Difference]: Start difference. First operand 249 states and 314 transitions. Second operand 26 states. [2019-10-14 21:48:13,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:13,166 INFO L93 Difference]: Finished difference Result 342 states and 416 transitions. [2019-10-14 21:48:13,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:48:13,167 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 182 [2019-10-14 21:48:13,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:13,169 INFO L225 Difference]: With dead ends: 342 [2019-10-14 21:48:13,170 INFO L226 Difference]: Without dead ends: 268 [2019-10-14 21:48:13,171 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:48:13,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2019-10-14 21:48:13,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 260. [2019-10-14 21:48:13,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2019-10-14 21:48:13,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 328 transitions. [2019-10-14 21:48:13,177 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 328 transitions. Word has length 182 [2019-10-14 21:48:13,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:13,178 INFO L462 AbstractCegarLoop]: Abstraction has 260 states and 328 transitions. [2019-10-14 21:48:13,178 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 21:48:13,178 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 328 transitions. [2019-10-14 21:48:13,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2019-10-14 21:48:13,179 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:13,179 INFO L380 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:13,384 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:13,385 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:13,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:13,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1863087315, now seen corresponding path program 19 times [2019-10-14 21:48:13,386 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:13,386 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979927801] [2019-10-14 21:48:13,386 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:13,387 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:13,387 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:13,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:13,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:13,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1914 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 1177 trivial. 0 not checked. [2019-10-14 21:48:13,741 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979927801] [2019-10-14 21:48:13,741 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340942366] [2019-10-14 21:48:13,741 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 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 21:48:13,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:13,843 INFO L256 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-14 21:48:13,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:13,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1914 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2019-10-14 21:48:13,912 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:13,912 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-14 21:48:13,912 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118633540] [2019-10-14 21:48:13,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:48:13,913 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:13,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:48:13,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:48:13,914 INFO L87 Difference]: Start difference. First operand 260 states and 328 transitions. Second operand 27 states. [2019-10-14 21:48:14,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:14,482 INFO L93 Difference]: Finished difference Result 356 states and 433 transitions. [2019-10-14 21:48:14,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:48:14,483 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 190 [2019-10-14 21:48:14,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:14,485 INFO L225 Difference]: With dead ends: 356 [2019-10-14 21:48:14,485 INFO L226 Difference]: Without dead ends: 279 [2019-10-14 21:48:14,485 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:48:14,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2019-10-14 21:48:14,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 271. [2019-10-14 21:48:14,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2019-10-14 21:48:14,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 342 transitions. [2019-10-14 21:48:14,493 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 342 transitions. Word has length 190 [2019-10-14 21:48:14,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:14,494 INFO L462 AbstractCegarLoop]: Abstraction has 271 states and 342 transitions. [2019-10-14 21:48:14,494 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:48:14,494 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 342 transitions. [2019-10-14 21:48:14,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-10-14 21:48:14,496 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:14,496 INFO L380 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:14,699 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:14,700 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:14,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:14,700 INFO L82 PathProgramCache]: Analyzing trace with hash 535268823, now seen corresponding path program 20 times [2019-10-14 21:48:14,701 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:14,701 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940637392] [2019-10-14 21:48:14,701 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:14,701 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:14,702 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:14,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:15,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:15,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1288 trivial. 0 not checked. [2019-10-14 21:48:15,157 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940637392] [2019-10-14 21:48:15,158 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302373388] [2019-10-14 21:48:15,158 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 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 21:48:15,260 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:48:15,260 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:15,261 INFO L256 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-14 21:48:15,263 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:15,305 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 0 proven. 1288 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2019-10-14 21:48:15,305 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:15,305 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-10-14 21:48:15,305 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312158791] [2019-10-14 21:48:15,306 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-14 21:48:15,306 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:15,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-14 21:48:15,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:48:15,307 INFO L87 Difference]: Start difference. First operand 271 states and 342 transitions. Second operand 28 states. [2019-10-14 21:48:15,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:15,818 INFO L93 Difference]: Finished difference Result 370 states and 450 transitions. [2019-10-14 21:48:15,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:48:15,819 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 198 [2019-10-14 21:48:15,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:15,822 INFO L225 Difference]: With dead ends: 370 [2019-10-14 21:48:15,822 INFO L226 Difference]: Without dead ends: 290 [2019-10-14 21:48:15,823 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-10-14 21:48:15,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2019-10-14 21:48:15,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 282. [2019-10-14 21:48:15,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2019-10-14 21:48:15,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 356 transitions. [2019-10-14 21:48:15,832 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 356 transitions. Word has length 198 [2019-10-14 21:48:15,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:15,832 INFO L462 AbstractCegarLoop]: Abstraction has 282 states and 356 transitions. [2019-10-14 21:48:15,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-14 21:48:15,832 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 356 transitions. [2019-10-14 21:48:15,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2019-10-14 21:48:15,834 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:15,834 INFO L380 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:16,038 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:16,038 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:16,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:16,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1361541613, now seen corresponding path program 21 times [2019-10-14 21:48:16,039 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:16,039 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873048858] [2019-10-14 21:48:16,039 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:16,039 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:16,040 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:16,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:16,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:16,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2280 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2019-10-14 21:48:16,514 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873048858] [2019-10-14 21:48:16,514 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657789770] [2019-10-14 21:48:16,514 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 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 21:48:19,100 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2019-10-14 21:48:19,100 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:19,106 INFO L256 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 21:48:19,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:19,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2280 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2019-10-14 21:48:19,146 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:19,146 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-10-14 21:48:19,147 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113656696] [2019-10-14 21:48:19,147 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-14 21:48:19,147 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:19,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-14 21:48:19,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:48:19,148 INFO L87 Difference]: Start difference. First operand 282 states and 356 transitions. Second operand 29 states. [2019-10-14 21:48:19,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:19,720 INFO L93 Difference]: Finished difference Result 384 states and 467 transitions. [2019-10-14 21:48:19,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-14 21:48:19,721 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 206 [2019-10-14 21:48:19,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:19,723 INFO L225 Difference]: With dead ends: 384 [2019-10-14 21:48:19,723 INFO L226 Difference]: Without dead ends: 301 [2019-10-14 21:48:19,724 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-14 21:48:19,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2019-10-14 21:48:19,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 293. [2019-10-14 21:48:19,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2019-10-14 21:48:19,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 370 transitions. [2019-10-14 21:48:19,732 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 370 transitions. Word has length 206 [2019-10-14 21:48:19,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:19,733 INFO L462 AbstractCegarLoop]: Abstraction has 293 states and 370 transitions. [2019-10-14 21:48:19,733 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-14 21:48:19,733 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 370 transitions. [2019-10-14 21:48:19,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2019-10-14 21:48:19,734 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:19,735 INFO L380 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:19,941 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:19,942 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:19,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:19,942 INFO L82 PathProgramCache]: Analyzing trace with hash 360772887, now seen corresponding path program 22 times [2019-10-14 21:48:19,943 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:19,943 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815966436] [2019-10-14 21:48:19,943 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:19,944 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:19,944 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:19,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:20,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:20,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2475 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1525 trivial. 0 not checked. [2019-10-14 21:48:20,403 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815966436] [2019-10-14 21:48:20,403 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308917286] [2019-10-14 21:48:20,404 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 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 21:48:20,513 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:48:20,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:20,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-14 21:48:20,517 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:20,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2475 backedges. 0 proven. 1525 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2019-10-14 21:48:20,557 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:20,557 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-14 21:48:20,557 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040853493] [2019-10-14 21:48:20,557 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-14 21:48:20,558 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:20,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-14 21:48:20,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:48:20,558 INFO L87 Difference]: Start difference. First operand 293 states and 370 transitions. Second operand 30 states. [2019-10-14 21:48:21,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:21,125 INFO L93 Difference]: Finished difference Result 398 states and 484 transitions. [2019-10-14 21:48:21,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-14 21:48:21,125 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 214 [2019-10-14 21:48:21,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:21,127 INFO L225 Difference]: With dead ends: 398 [2019-10-14 21:48:21,127 INFO L226 Difference]: Without dead ends: 312 [2019-10-14 21:48:21,128 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-14 21:48:21,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2019-10-14 21:48:21,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 304. [2019-10-14 21:48:21,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2019-10-14 21:48:21,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 384 transitions. [2019-10-14 21:48:21,135 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 384 transitions. Word has length 214 [2019-10-14 21:48:21,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:21,136 INFO L462 AbstractCegarLoop]: Abstraction has 304 states and 384 transitions. [2019-10-14 21:48:21,136 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-14 21:48:21,136 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 384 transitions. [2019-10-14 21:48:21,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-10-14 21:48:21,138 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:21,138 INFO L380 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:21,341 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:21,342 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:21,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:21,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1084974931, now seen corresponding path program 23 times [2019-10-14 21:48:21,343 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:21,343 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25230435] [2019-10-14 21:48:21,343 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:21,343 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:21,344 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:21,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:21,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:21,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2678 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1651 trivial. 0 not checked. [2019-10-14 21:48:21,811 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25230435] [2019-10-14 21:48:21,811 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097040545] [2019-10-14 21:48:21,811 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 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 21:48:22,268 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2019-10-14 21:48:22,269 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:48:22,272 INFO L256 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:48:22,274 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:48:22,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2678 backedges. 0 proven. 1651 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2019-10-14 21:48:22,347 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:48:22,347 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-14 21:48:22,347 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261010733] [2019-10-14 21:48:22,347 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:48:22,347 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:48:22,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:48:22,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:48:22,348 INFO L87 Difference]: Start difference. First operand 304 states and 384 transitions. Second operand 31 states. [2019-10-14 21:48:22,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:48:22,876 INFO L93 Difference]: Finished difference Result 412 states and 501 transitions. [2019-10-14 21:48:22,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-14 21:48:22,876 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 222 [2019-10-14 21:48:22,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:48:22,879 INFO L225 Difference]: With dead ends: 412 [2019-10-14 21:48:22,880 INFO L226 Difference]: Without dead ends: 323 [2019-10-14 21:48:22,881 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:48:22,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2019-10-14 21:48:22,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 315. [2019-10-14 21:48:22,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2019-10-14 21:48:22,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 398 transitions. [2019-10-14 21:48:22,889 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 398 transitions. Word has length 222 [2019-10-14 21:48:22,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:48:22,890 INFO L462 AbstractCegarLoop]: Abstraction has 315 states and 398 transitions. [2019-10-14 21:48:22,890 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:48:22,890 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 398 transitions. [2019-10-14 21:48:22,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2019-10-14 21:48:22,891 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:48:22,892 INFO L380 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:48:23,096 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:48:23,097 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:48:23,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:48:23,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1828138071, now seen corresponding path program 24 times [2019-10-14 21:48:23,097 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:48:23,097 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208830957] [2019-10-14 21:48:23,098 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:23,098 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:48:23,098 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:48:23,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:23,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:48:23,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2889 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1782 trivial. 0 not checked. [2019-10-14 21:48:23,539 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208830957] [2019-10-14 21:48:23,539 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96192433] [2019-10-14 21:48:23,539 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 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