/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:43:38,259 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:43:38,262 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:43:38,287 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:43:38,288 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:43:38,292 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:43:38,296 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:43:38,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:43:38,316 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:43:38,318 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:43:38,320 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:43:38,321 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:43:38,321 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:43:38,322 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:43:38,323 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:43:38,327 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:43:38,329 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:43:38,331 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:43:38,333 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:43:38,345 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:43:38,353 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:43:38,362 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:43:38,365 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:43:38,366 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:43:38,372 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:43:38,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:43:38,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:43:38,397 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:43:38,399 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 [2020-07-21 01:43:38,447 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:43:38,447 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:43:38,451 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:43:38,451 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:43:38,452 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:43:38,452 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:43:38,452 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:43:38,452 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:43:38,453 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:43:38,453 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:43:38,454 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:43:38,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:43:38,455 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:43:38,456 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:43:38,456 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:43:38,457 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:43:38,457 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:43:38,457 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:43:38,458 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:43:38,458 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:43:38,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:43:38,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:43:38,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:43:38,459 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:43:38,459 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:43:38,459 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:43:38,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:38,460 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:43:38,460 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:43:38,460 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:43:38,856 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:43:38,897 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:43:38,905 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:43:38,908 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:43:38,909 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:43:38,911 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 01:43:39,045 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7c948f13/cb910978252547239509d7264077f711/FLAG68fd648c0 [2020-07-21 01:43:39,737 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:43:39,739 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 01:43:39,751 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7c948f13/cb910978252547239509d7264077f711/FLAG68fd648c0 [2020-07-21 01:43:40,110 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7c948f13/cb910978252547239509d7264077f711 [2020-07-21 01:43:40,134 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:43:40,141 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:43:40,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:43:40,151 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:43:40,157 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:43:40,160 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,166 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22e11f7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40, skipping insertion in model container [2020-07-21 01:43:40,166 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:43:40,218 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:43:40,460 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:43:40,468 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:43:40,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:43:40,535 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:43:40,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40 WrapperNode [2020-07-21 01:43:40,537 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:43:40,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:43:40,540 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:43:40,540 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:43:40,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,694 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,704 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,715 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,730 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (1/1) ... [2020-07-21 01:43:40,732 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:43:40,734 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:43:40,734 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:43:40,734 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:43:40,737 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (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 [2020-07-21 01:43:40,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:43:40,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:43:40,828 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:43:40,829 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:43:40,829 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:43:40,829 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:43:40,830 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:43:40,830 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:43:40,830 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 01:43:40,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 01:43:40,831 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 01:43:40,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 01:43:40,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:43:40,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:43:41,151 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:43:41,152 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 01:43:41,159 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:43:41 BoogieIcfgContainer [2020-07-21 01:43:41,160 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:43:41,161 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:43:41,162 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:43:41,167 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:43:41,168 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:43:40" (1/3) ... [2020-07-21 01:43:41,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@201eb18f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:43:41, skipping insertion in model container [2020-07-21 01:43:41,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:43:40" (2/3) ... [2020-07-21 01:43:41,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@201eb18f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:43:41, skipping insertion in model container [2020-07-21 01:43:41,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:43:41" (3/3) ... [2020-07-21 01:43:41,174 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-21 01:43:41,194 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:43:41,225 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:43:41,307 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:43:41,374 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:43:41,374 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:43:41,374 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:43:41,374 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:43:41,375 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:43:41,375 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:43:41,375 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:43:41,375 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:43:41,412 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 01:43:41,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 01:43:41,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:41,423 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:41,424 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:41,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:41,431 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-21 01:43:41,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:41,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574605015] [2020-07-21 01:43:41,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:41,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:43:41,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:41,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 01:43:41,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:41,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:41,567 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:43:41,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574605015] [2020-07-21 01:43:41,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:43:41,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 01:43:41,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560135632] [2020-07-21 01:43:41,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 01:43:41,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:41,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 01:43:41,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 01:43:41,604 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-21 01:43:41,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:41,641 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-21 01:43:41,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 01:43:41,643 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-21 01:43:41,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:41,654 INFO L225 Difference]: With dead ends: 42 [2020-07-21 01:43:41,655 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 01:43:41,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 01:43:41,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 01:43:41,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 01:43:41,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 01:43:41,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-21 01:43:41,723 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-21 01:43:41,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:41,724 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-21 01:43:41,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 01:43:41,725 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-21 01:43:41,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 01:43:41,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:41,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:41,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:41,943 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:41,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:41,944 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-21 01:43:41,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:41,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250187349] [2020-07-21 01:43:41,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:41,997 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:43:41,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:42,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 01:43:42,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:42,042 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:42,042 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:43:42,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250187349] [2020-07-21 01:43:42,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:43:42,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:43:42,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154272042] [2020-07-21 01:43:42,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:43:42,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:42,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:43:42,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:43:42,047 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-21 01:43:42,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:42,107 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 01:43:42,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:43:42,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-21 01:43:42,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:42,111 INFO L225 Difference]: With dead ends: 35 [2020-07-21 01:43:42,111 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 01:43:42,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:43:42,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 01:43:42,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-21 01:43:42,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 01:43:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 01:43:42,121 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-21 01:43:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:42,121 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 01:43:42,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:43:42,122 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 01:43:42,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 01:43:42,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:42,123 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:42,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:42,337 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:42,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:42,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-21 01:43:42,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:42,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742918411] [2020-07-21 01:43:42,341 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:42,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:43:42,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:42,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:43:42,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:42,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:42,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:43:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:42,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742918411] [2020-07-21 01:43:42,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:43:42,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 01:43:42,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120876539] [2020-07-21 01:43:42,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:43:42,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:42,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:43:42,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:43:42,514 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-21 01:43:42,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:42,657 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-21 01:43:42,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:43:42,658 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 01:43:42,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:42,660 INFO L225 Difference]: With dead ends: 52 [2020-07-21 01:43:42,661 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 01:43:42,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:43:42,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 01:43:42,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-21 01:43:42,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 01:43:42,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-21 01:43:42,674 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-21 01:43:42,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:42,674 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-21 01:43:42,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:43:42,675 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-21 01:43:42,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:43:42,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:42,676 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:42,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:42,891 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:42,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:42,893 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-21 01:43:42,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:42,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301191749] [2020-07-21 01:43:42,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:42,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:43:42,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:42,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 01:43:42,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:43,058 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:43,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:43:43,208 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:43,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301191749] [2020-07-21 01:43:43,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:43:43,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 01:43:43,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240145512] [2020-07-21 01:43:43,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 01:43:43,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:43,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 01:43:43,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 01:43:43,214 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-21 01:43:43,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:43,535 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-21 01:43:43,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 01:43:43,537 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-21 01:43:43,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:43,540 INFO L225 Difference]: With dead ends: 102 [2020-07-21 01:43:43,540 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 01:43:43,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 01:43:43,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 01:43:43,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-21 01:43:43,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 01:43:43,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-21 01:43:43,561 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-21 01:43:43,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:43,561 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-21 01:43:43,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 01:43:43,562 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-21 01:43:43,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 01:43:43,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:43,564 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:43,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:43,780 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:43,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:43,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-21 01:43:43,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:43,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52824235] [2020-07-21 01:43:43,782 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:43,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:43:43,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:43,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:43:43,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:44,128 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:44,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:43:44,550 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:44,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52824235] [2020-07-21 01:43:44,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:43:44,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 01:43:44,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395968214] [2020-07-21 01:43:44,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 01:43:44,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:44,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 01:43:44,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:43:44,556 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-21 01:43:45,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:45,178 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-21 01:43:45,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 01:43:45,180 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-21 01:43:45,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:45,183 INFO L225 Difference]: With dead ends: 210 [2020-07-21 01:43:45,184 INFO L226 Difference]: Without dead ends: 165 [2020-07-21 01:43:45,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:43:45,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-21 01:43:45,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-21 01:43:45,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 01:43:45,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-21 01:43:45,224 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-21 01:43:45,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:45,226 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-21 01:43:45,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 01:43:45,230 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-21 01:43:45,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 01:43:45,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:45,234 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:45,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:45,449 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:45,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:45,450 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-21 01:43:45,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:45,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730807332] [2020-07-21 01:43:45,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:45,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:43:45,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:45,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 01:43:45,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:46,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:43:47,563 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:47,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730807332] [2020-07-21 01:43:47,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:43:47,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 01:43:47,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172429727] [2020-07-21 01:43:47,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 01:43:47,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:47,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 01:43:47,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 01:43:47,571 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-21 01:43:48,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:43:48,702 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-21 01:43:48,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 01:43:48,703 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-21 01:43:48,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:43:48,709 INFO L225 Difference]: With dead ends: 426 [2020-07-21 01:43:48,709 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 01:43:48,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 01:43:48,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 01:43:48,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-21 01:43:48,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 01:43:48,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-21 01:43:48,778 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-21 01:43:48,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:43:48,778 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-21 01:43:48,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 01:43:48,779 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-21 01:43:48,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 01:43:48,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:43:48,783 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:43:48,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:48,995 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:43:48,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:43:48,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-21 01:43:48,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:43:48,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283836853] [2020-07-21 01:43:48,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:43:51,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:43:51,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:43:51,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 01:43:51,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:43:53,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:53,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:43:57,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:43:57,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283836853] [2020-07-21 01:43:57,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:43:57,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 01:43:57,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004436357] [2020-07-21 01:43:57,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 01:43:57,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:43:57,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 01:43:57,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 01:43:57,618 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-21 01:44:01,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:44:01,606 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-21 01:44:01,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 01:44:01,609 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-21 01:44:01,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:44:01,621 INFO L225 Difference]: With dead ends: 858 [2020-07-21 01:44:01,622 INFO L226 Difference]: Without dead ends: 669 [2020-07-21 01:44:01,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 01:44:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-21 01:44:01,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-21 01:44:01,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 01:44:01,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-21 01:44:01,704 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-21 01:44:01,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:44:01,708 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-21 01:44:01,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 01:44:01,708 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-21 01:44:01,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 01:44:01,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:44:01,730 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:44:01,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:01,932 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:44:01,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:44:01,932 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-21 01:44:01,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:44:01,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735150299] [2020-07-21 01:44:01,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:28,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:44:28,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:44:28,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 01:44:28,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:44:34,605 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:44:34,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:44:52,165 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:44:52,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735150299] [2020-07-21 01:44:52,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:44:52,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-21 01:44:52,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146368193] [2020-07-21 01:44:52,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-21 01:44:52,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:44:52,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-21 01:44:52,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 01:44:52,183 INFO L87 Difference]: Start difference. First operand 576 states and 671 transitions. Second operand 192 states. [2020-07-21 01:45:24,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:45:24,342 INFO L93 Difference]: Finished difference Result 1722 states and 2199 transitions. [2020-07-21 01:45:24,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-21 01:45:24,345 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 202 [2020-07-21 01:45:24,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:45:24,370 INFO L225 Difference]: With dead ends: 1722 [2020-07-21 01:45:24,374 INFO L226 Difference]: Without dead ends: 1341 [2020-07-21 01:45:24,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 01:45:24,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1341 states. [2020-07-21 01:45:24,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1341 to 1152. [2020-07-21 01:45:24,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1152 states. [2020-07-21 01:45:24,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1152 states to 1152 states and 1343 transitions. [2020-07-21 01:45:24,457 INFO L78 Accepts]: Start accepts. Automaton has 1152 states and 1343 transitions. Word has length 202 [2020-07-21 01:45:24,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:45:24,460 INFO L479 AbstractCegarLoop]: Abstraction has 1152 states and 1343 transitions. [2020-07-21 01:45:24,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-21 01:45:24,460 INFO L276 IsEmpty]: Start isEmpty. Operand 1152 states and 1343 transitions. [2020-07-21 01:45:24,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 01:45:24,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:45:24,471 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:45:24,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:45:24,688 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:45:24,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:45:24,689 INFO L82 PathProgramCache]: Analyzing trace with hash -74498967, now seen corresponding path program 7 times [2020-07-21 01:45:24,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:45:24,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791705757] [2020-07-21 01:45:24,690 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in