/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 NUM_VARIABLES --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/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:19,233 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:19,237 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:19,251 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:12:19,252 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:12:19,253 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:12:19,255 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:12:19,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:12:19,259 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:12:19,260 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:12:19,261 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:12:19,262 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:12:19,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:19,263 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:19,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:19,266 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:19,267 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:19,268 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:19,270 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:19,272 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:19,273 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:19,275 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:19,276 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:19,276 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:19,279 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:19,287 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:12:19,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:12:19,289 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:12:19,289 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 [2020-07-20 17:12:19,306 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:19,306 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:19,308 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:19,308 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:19,308 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:19,308 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:19,309 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:19,309 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:19,309 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:19,309 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:19,309 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:19,310 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:19,310 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:19,310 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:19,310 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:19,310 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:19,311 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:19,311 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:19,311 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:19,311 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:19,311 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:19,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:19,312 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:19,312 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:19,312 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:19,313 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:19,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:19,313 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:19,313 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:19,313 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 -> NUM_VARIABLES 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 [2020-07-20 17:12:19,680 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:19,696 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:19,700 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:19,702 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:19,702 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:19,703 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 17:12:19,797 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8cc8c545/761fcd8d09084560a04c5f40380b3712/FLAG844695598 [2020-07-20 17:12:20,370 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:20,371 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-20 17:12:20,384 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8cc8c545/761fcd8d09084560a04c5f40380b3712/FLAG844695598 [2020-07-20 17:12:20,713 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8cc8c545/761fcd8d09084560a04c5f40380b3712 [2020-07-20 17:12:20,724 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:20,727 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:20,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:20,729 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:20,733 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:20,735 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,738 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@612f78e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20, skipping insertion in model container [2020-07-20 17:12:20,739 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,748 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:20,777 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:20,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:20,993 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:21,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:21,039 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:21,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21 WrapperNode [2020-07-20 17:12:21,039 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:21,040 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:21,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:21,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:21,056 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,142 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,142 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,149 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,157 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,159 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (1/1) ... [2020-07-20 17:12:21,162 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:21,162 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:21,162 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:21,162 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:21,163 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (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 [2020-07-20 17:12:21,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:21,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:21,233 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:21,234 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:21,234 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:21,234 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:21,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:21,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:21,584 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:21,585 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:21,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:21 BoogieIcfgContainer [2020-07-20 17:12:21,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:21,591 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:21,591 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:21,594 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:21,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:20" (1/3) ... [2020-07-20 17:12:21,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3672389a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:21, skipping insertion in model container [2020-07-20 17:12:21,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:21" (2/3) ... [2020-07-20 17:12:21,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3672389a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:21, skipping insertion in model container [2020-07-20 17:12:21,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:21" (3/3) ... [2020-07-20 17:12:21,598 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-20 17:12:21,611 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:21,619 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:21,635 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:21,665 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:21,665 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:21,665 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:21,665 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:21,666 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:21,666 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:21,666 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:21,667 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:21,688 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-20 17:12:21,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:21,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:21,697 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:21,698 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:21,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:21,703 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-20 17:12:21,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:21,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420183894] [2020-07-20 17:12:21,711 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 [2020-07-20 17:12:21,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:21,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:21,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:21,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:21,890 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:21,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:21,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420183894] [2020-07-20 17:12:21,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:21,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:21,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554307554] [2020-07-20 17:12:21,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:21,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:21,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:21,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:21,920 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-20 17:12:22,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:22,011 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-20 17:12:22,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:22,013 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:22,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:22,032 INFO L225 Difference]: With dead ends: 93 [2020-07-20 17:12:22,032 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 17:12:22,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 17:12:22,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-20 17:12:22,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 17:12:22,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-20 17:12:22,086 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-20 17:12:22,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:22,087 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-20 17:12:22,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:22,088 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-20 17:12:22,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:22,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,089 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:22,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:22,305 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:22,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:22,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-20 17:12:22,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:22,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797450634] [2020-07-20 17:12:22,307 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 [2020-07-20 17:12:22,378 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:22,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:22,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:22,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:22,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:22,407 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:22,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797450634] [2020-07-20 17:12:22,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:22,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:22,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139254557] [2020-07-20 17:12:22,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:22,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:22,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:22,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,416 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-20 17:12:22,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:22,460 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-20 17:12:22,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:22,462 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:22,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:22,468 INFO L225 Difference]: With dead ends: 127 [2020-07-20 17:12:22,468 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 17:12:22,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 17:12:22,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-20 17:12:22,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 17:12:22,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-20 17:12:22,498 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-20 17:12:22,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:22,499 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-20 17:12:22,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:22,500 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-20 17:12:22,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:22,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,501 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:22,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:22,717 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:22,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:22,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-20 17:12:22,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:22,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004381229] [2020-07-20 17:12:22,719 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 [2020-07-20 17:12:22,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:22,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:22,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:22,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:22,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:22,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:22,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004381229] [2020-07-20 17:12:22,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:22,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:22,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394267502] [2020-07-20 17:12:22,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:22,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:22,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:22,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,818 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-20 17:12:22,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:22,844 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-20 17:12:22,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:22,845 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:22,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:22,847 INFO L225 Difference]: With dead ends: 117 [2020-07-20 17:12:22,847 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 17:12:22,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 17:12:22,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-20 17:12:22,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 17:12:22,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-20 17:12:22,865 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-20 17:12:22,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:22,868 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-20 17:12:22,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:22,869 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-20 17:12:22,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:22,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,871 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,072 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-20 17:12:23,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020285153] [2020-07-20 17:12:23,075 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 [2020-07-20 17:12:23,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:23,152 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020285153] [2020-07-20 17:12:23,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485616184] [2020-07-20 17:12:23,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,156 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-20 17:12:23,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,198 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-20 17:12:23,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,199 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:23,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,201 INFO L225 Difference]: With dead ends: 148 [2020-07-20 17:12:23,202 INFO L226 Difference]: Without dead ends: 146 [2020-07-20 17:12:23,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-20 17:12:23,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-20 17:12:23,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-20 17:12:23,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-20 17:12:23,233 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-20 17:12:23,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:23,233 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-20 17:12:23,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:23,233 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-20 17:12:23,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:23,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:23,235 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,450 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,451 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-20 17:12:23,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726376664] [2020-07-20 17:12:23,453 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 [2020-07-20 17:12:23,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:23,521 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726376664] [2020-07-20 17:12:23,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917057831] [2020-07-20 17:12:23,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,524 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-20 17:12:23,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,555 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-20 17:12:23,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,555 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:23,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,557 INFO L225 Difference]: With dead ends: 244 [2020-07-20 17:12:23,557 INFO L226 Difference]: Without dead ends: 148 [2020-07-20 17:12:23,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-20 17:12:23,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-20 17:12:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-20 17:12:23,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-20 17:12:23,574 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-20 17:12:23,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:23,575 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-20 17:12:23,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:23,575 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-20 17:12:23,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:23,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:23,577 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,790 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,791 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-20 17:12:23,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743743796] [2020-07-20 17:12:23,793 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 [2020-07-20 17:12:23,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:23,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743743796] [2020-07-20 17:12:23,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812098295] [2020-07-20 17:12:23,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,868 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-20 17:12:23,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,887 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-20 17:12:23,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:23,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,890 INFO L225 Difference]: With dead ends: 219 [2020-07-20 17:12:23,890 INFO L226 Difference]: Without dead ends: 150 [2020-07-20 17:12:23,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-20 17:12:23,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-20 17:12:23,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-20 17:12:23,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-20 17:12:23,903 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-20 17:12:23,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:23,903 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-20 17:12:23,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:23,904 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-20 17:12:23,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:23,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:23,905 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,120 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-20 17:12:24,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [551643749] [2020-07-20 17:12:24,121 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 [2020-07-20 17:12:24,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:24,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:24,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:24,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:24,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:24,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:24,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [551643749] [2020-07-20 17:12:24,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:24,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:24,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082529124] [2020-07-20 17:12:24,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:24,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:24,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:24,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,190 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-20 17:12:24,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:24,210 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-20 17:12:24,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:24,211 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:24,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:24,213 INFO L225 Difference]: With dead ends: 276 [2020-07-20 17:12:24,214 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 17:12:24,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 17:12:24,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-20 17:12:24,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 17:12:24,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-20 17:12:24,230 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-20 17:12:24,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,230 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-20 17:12:24,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,231 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-20 17:12:24,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:24,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,233 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,447 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-20 17:12:24,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166099288] [2020-07-20 17:12:24,448 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 [2020-07-20 17:12:24,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:24,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:24,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:24,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:24,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:24,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:24,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166099288] [2020-07-20 17:12:24,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:24,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:24,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971492436] [2020-07-20 17:12:24,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:24,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:24,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:24,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,508 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-20 17:12:24,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:24,546 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-20 17:12:24,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:24,546 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:24,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:24,549 INFO L225 Difference]: With dead ends: 472 [2020-07-20 17:12:24,549 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 17:12:24,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 17:12:24,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-20 17:12:24,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 17:12:24,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-20 17:12:24,566 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-20 17:12:24,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,567 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-20 17:12:24,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,567 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-20 17:12:24,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:24,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,570 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,783 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-20 17:12:24,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328913929] [2020-07-20 17:12:24,785 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 [2020-07-20 17:12:24,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:24,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:24,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:24,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:24,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:24,879 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:24,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328913929] [2020-07-20 17:12:24,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:24,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:24,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189571700] [2020-07-20 17:12:24,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:24,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:24,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:24,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,882 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-20 17:12:24,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:24,902 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-20 17:12:24,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:24,902 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:24,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:24,905 INFO L225 Difference]: With dead ends: 420 [2020-07-20 17:12:24,905 INFO L226 Difference]: Without dead ends: 286 [2020-07-20 17:12:24,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-20 17:12:24,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-20 17:12:24,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 17:12:24,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-20 17:12:24,920 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-20 17:12:24,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,920 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-20 17:12:24,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,921 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-20 17:12:24,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:24,922 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,923 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,136 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,137 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-20 17:12:25,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566544321] [2020-07-20 17:12:25,139 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,188 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:25,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566544321] [2020-07-20 17:12:25,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367634337] [2020-07-20 17:12:25,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,201 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-20 17:12:25,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,242 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-20 17:12:25,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,244 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:25,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,248 INFO L225 Difference]: With dead ends: 524 [2020-07-20 17:12:25,248 INFO L226 Difference]: Without dead ends: 522 [2020-07-20 17:12:25,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-20 17:12:25,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-20 17:12:25,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-20 17:12:25,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-20 17:12:25,270 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-20 17:12:25,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,273 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-20 17:12:25,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,273 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-20 17:12:25,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:25,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,275 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,490 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,491 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-20 17:12:25,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722158410] [2020-07-20 17:12:25,493 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:25,555 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722158410] [2020-07-20 17:12:25,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029478049] [2020-07-20 17:12:25,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,559 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-20 17:12:25,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,609 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-20 17:12:25,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,609 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:25,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,615 INFO L225 Difference]: With dead ends: 924 [2020-07-20 17:12:25,615 INFO L226 Difference]: Without dead ends: 546 [2020-07-20 17:12:25,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-20 17:12:25,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-20 17:12:25,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-20 17:12:25,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-20 17:12:25,650 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-20 17:12:25,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,651 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-20 17:12:25,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-20 17:12:25,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:25,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,655 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,871 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,872 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-20 17:12:25,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330167372] [2020-07-20 17:12:25,873 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:25,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330167372] [2020-07-20 17:12:25,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417609266] [2020-07-20 17:12:25,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,937 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-20 17:12:25,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,962 INFO L93 Difference]: Finished difference Result 816 states and 1348 transitions. [2020-07-20 17:12:25,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,963 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:25,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,967 INFO L225 Difference]: With dead ends: 816 [2020-07-20 17:12:25,967 INFO L226 Difference]: Without dead ends: 554 [2020-07-20 17:12:25,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2020-07-20 17:12:25,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 552. [2020-07-20 17:12:25,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 552 states. [2020-07-20 17:12:25,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 902 transitions. [2020-07-20 17:12:25,989 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 902 transitions. Word has length 25 [2020-07-20 17:12:25,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,989 INFO L479 AbstractCegarLoop]: Abstraction has 552 states and 902 transitions. [2020-07-20 17:12:25,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,990 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 902 transitions. [2020-07-20 17:12:25,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:25,991 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,991 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,205 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,206 INFO L82 PathProgramCache]: Analyzing trace with hash 2046215812, now seen corresponding path program 1 times [2020-07-20 17:12:26,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102705369] [2020-07-20 17:12:26,207 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,276 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102705369] [2020-07-20 17:12:26,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578404461] [2020-07-20 17:12:26,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,279 INFO L87 Difference]: Start difference. First operand 552 states and 902 transitions. Second operand 3 states. [2020-07-20 17:12:26,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,309 INFO L93 Difference]: Finished difference Result 1004 states and 1672 transitions. [2020-07-20 17:12:26,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,310 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:26,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,317 INFO L225 Difference]: With dead ends: 1004 [2020-07-20 17:12:26,318 INFO L226 Difference]: Without dead ends: 1002 [2020-07-20 17:12:26,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-20 17:12:26,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 776. [2020-07-20 17:12:26,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-20 17:12:26,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-20 17:12:26,347 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-20 17:12:26,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,348 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-20 17:12:26,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,348 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-20 17:12:26,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:26,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,350 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,564 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-20 17:12:26,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785220197] [2020-07-20 17:12:26,566 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,622 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785220197] [2020-07-20 17:12:26,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496433056] [2020-07-20 17:12:26,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,624 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-20 17:12:26,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,659 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-20 17:12:26,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,660 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:26,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,666 INFO L225 Difference]: With dead ends: 1820 [2020-07-20 17:12:26,666 INFO L226 Difference]: Without dead ends: 1066 [2020-07-20 17:12:26,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-20 17:12:26,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-20 17:12:26,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-20 17:12:26,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-20 17:12:26,711 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-20 17:12:26,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,712 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-20 17:12:26,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,712 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-20 17:12:26,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:26,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,929 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,930 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-20 17:12:26,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979987210] [2020-07-20 17:12:26,931 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979987210] [2020-07-20 17:12:26,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417786251] [2020-07-20 17:12:26,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,997 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-20 17:12:27,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,040 INFO L93 Difference]: Finished difference Result 1596 states and 2520 transitions. [2020-07-20 17:12:27,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,041 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:27,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,048 INFO L225 Difference]: With dead ends: 1596 [2020-07-20 17:12:27,049 INFO L226 Difference]: Without dead ends: 1082 [2020-07-20 17:12:27,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2020-07-20 17:12:27,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 1080. [2020-07-20 17:12:27,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1080 states. [2020-07-20 17:12:27,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1080 states to 1080 states and 1686 transitions. [2020-07-20 17:12:27,101 INFO L78 Accepts]: Start accepts. Automaton has 1080 states and 1686 transitions. Word has length 26 [2020-07-20 17:12:27,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,102 INFO L479 AbstractCegarLoop]: Abstraction has 1080 states and 1686 transitions. [2020-07-20 17:12:27,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,102 INFO L276 IsEmpty]: Start isEmpty. Operand 1080 states and 1686 transitions. [2020-07-20 17:12:27,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:27,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,106 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,320 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,320 INFO L82 PathProgramCache]: Analyzing trace with hash 2023498770, now seen corresponding path program 1 times [2020-07-20 17:12:27,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074573710] [2020-07-20 17:12:27,321 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:27,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074573710] [2020-07-20 17:12:27,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113987267] [2020-07-20 17:12:27,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,378 INFO L87 Difference]: Start difference. First operand 1080 states and 1686 transitions. Second operand 3 states. [2020-07-20 17:12:27,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,417 INFO L93 Difference]: Finished difference Result 1932 states and 3080 transitions. [2020-07-20 17:12:27,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,418 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:27,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,429 INFO L225 Difference]: With dead ends: 1932 [2020-07-20 17:12:27,430 INFO L226 Difference]: Without dead ends: 1930 [2020-07-20 17:12:27,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-20 17:12:27,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1544. [2020-07-20 17:12:27,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-20 17:12:27,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-20 17:12:27,493 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-20 17:12:27,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,493 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-20 17:12:27,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,494 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-20 17:12:27,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:27,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,497 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,714 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-20 17:12:27,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018465599] [2020-07-20 17:12:27,715 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:27,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018465599] [2020-07-20 17:12:27,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603513570] [2020-07-20 17:12:27,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,849 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-20 17:12:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,908 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-20 17:12:27,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,909 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,921 INFO L225 Difference]: With dead ends: 3596 [2020-07-20 17:12:27,921 INFO L226 Difference]: Without dead ends: 2090 [2020-07-20 17:12:27,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-20 17:12:27,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-20 17:12:27,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-20 17:12:28,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-20 17:12:28,001 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-20 17:12:28,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,002 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-20 17:12:28,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,002 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-20 17:12:28,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:28,006 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,006 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,221 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-20 17:12:28,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324537923] [2020-07-20 17:12:28,224 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:28,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324537923] [2020-07-20 17:12:28,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814185407] [2020-07-20 17:12:28,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,282 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-20 17:12:28,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,333 INFO L93 Difference]: Finished difference Result 3132 states and 4696 transitions. [2020-07-20 17:12:28,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,334 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:28,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,347 INFO L225 Difference]: With dead ends: 3132 [2020-07-20 17:12:28,347 INFO L226 Difference]: Without dead ends: 2122 [2020-07-20 17:12:28,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2020-07-20 17:12:28,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 2120. [2020-07-20 17:12:28,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2120 states. [2020-07-20 17:12:28,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2120 states to 2120 states and 3142 transitions. [2020-07-20 17:12:28,436 INFO L78 Accepts]: Start accepts. Automaton has 2120 states and 3142 transitions. Word has length 27 [2020-07-20 17:12:28,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,437 INFO L479 AbstractCegarLoop]: Abstraction has 2120 states and 3142 transitions. [2020-07-20 17:12:28,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,437 INFO L276 IsEmpty]: Start isEmpty. Operand 2120 states and 3142 transitions. [2020-07-20 17:12:28,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:28,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,441 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,656 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1319270809, now seen corresponding path program 1 times [2020-07-20 17:12:28,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501826147] [2020-07-20 17:12:28,657 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:28,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501826147] [2020-07-20 17:12:28,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157300984] [2020-07-20 17:12:28,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,710 INFO L87 Difference]: Start difference. First operand 2120 states and 3142 transitions. Second operand 3 states. [2020-07-20 17:12:28,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,783 INFO L93 Difference]: Finished difference Result 3724 states and 5640 transitions. [2020-07-20 17:12:28,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,784 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:28,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,805 INFO L225 Difference]: With dead ends: 3724 [2020-07-20 17:12:28,805 INFO L226 Difference]: Without dead ends: 3722 [2020-07-20 17:12:28,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-20 17:12:28,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3080. [2020-07-20 17:12:28,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-20 17:12:28,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-20 17:12:28,940 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-20 17:12:28,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,940 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-20 17:12:28,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,941 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-20 17:12:28,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:28,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,946 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,162 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,162 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-20 17:12:29,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463149093] [2020-07-20 17:12:29,163 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,198 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463149093] [2020-07-20 17:12:29,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353083122] [2020-07-20 17:12:29,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,209 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-20 17:12:29,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,282 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-20 17:12:29,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,283 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:29,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,303 INFO L225 Difference]: With dead ends: 7116 [2020-07-20 17:12:29,304 INFO L226 Difference]: Without dead ends: 4106 [2020-07-20 17:12:29,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-20 17:12:29,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-20 17:12:29,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-20 17:12:29,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-20 17:12:29,431 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-20 17:12:29,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,432 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-20 17:12:29,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,432 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-20 17:12:29,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:12:29,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,653 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,654 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-20 17:12:29,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526723623] [2020-07-20 17:12:29,655 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,703 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526723623] [2020-07-20 17:12:29,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161715382] [2020-07-20 17:12:29,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,706 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-20 17:12:29,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,764 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-20 17:12:29,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,765 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 17:12:29,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,789 INFO L225 Difference]: With dead ends: 6156 [2020-07-20 17:12:29,789 INFO L226 Difference]: Without dead ends: 4170 [2020-07-20 17:12:29,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-20 17:12:29,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-20 17:12:29,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-20 17:12:29,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-20 17:12:29,938 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-20 17:12:29,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,939 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-20 17:12:29,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,939 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-20 17:12:29,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:12:29,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,947 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,161 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,162 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-20 17:12:30,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644695295] [2020-07-20 17:12:30,163 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:30,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:30,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644695295] [2020-07-20 17:12:30,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709812371] [2020-07-20 17:12:30,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,228 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-20 17:12:30,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,425 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-20 17:12:30,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,425 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 17:12:30,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,448 INFO L225 Difference]: With dead ends: 12108 [2020-07-20 17:12:30,448 INFO L226 Difference]: Without dead ends: 8074 [2020-07-20 17:12:30,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-20 17:12:30,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-20 17:12:30,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-20 17:12:30,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-20 17:12:30,663 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-20 17:12:30,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,663 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-20 17:12:30,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,663 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-20 17:12:30,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:12:30,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,675 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,890 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-20 17:12:30,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135505528] [2020-07-20 17:12:30,893 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:30,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:30,945 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135505528] [2020-07-20 17:12:30,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710713311] [2020-07-20 17:12:30,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,947 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-20 17:12:31,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,063 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-20 17:12:31,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,064 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 17:12:31,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,086 INFO L225 Difference]: With dead ends: 9100 [2020-07-20 17:12:31,086 INFO L226 Difference]: Without dead ends: 9098 [2020-07-20 17:12:31,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-20 17:12:31,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-20 17:12:31,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-20 17:12:31,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-20 17:12:31,359 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-20 17:12:31,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,359 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-20 17:12:31,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,359 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-20 17:12:31,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:12:31,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,371 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,585 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,586 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-20 17:12:31,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760656716] [2020-07-20 17:12:31,587 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760656716] [2020-07-20 17:12:31,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183308114] [2020-07-20 17:12:31,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,640 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-20 17:12:31,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,797 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-20 17:12:31,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,798 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 17:12:31,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,833 INFO L225 Difference]: With dead ends: 13708 [2020-07-20 17:12:31,834 INFO L226 Difference]: Without dead ends: 13706 [2020-07-20 17:12:31,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-20 17:12:32,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-20 17:12:32,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-20 17:12:32,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-20 17:12:32,109 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-20 17:12:32,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,110 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-20 17:12:32,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,110 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-20 17:12:32,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:12:32,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:32,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,348 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-20 17:12:32,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242560334] [2020-07-20 17:12:32,349 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242560334] [2020-07-20 17:12:32,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589836935] [2020-07-20 17:12:32,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,406 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-20 17:12:32,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,685 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-20 17:12:32,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,686 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 17:12:32,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,729 INFO L225 Difference]: With dead ends: 27788 [2020-07-20 17:12:32,729 INFO L226 Difference]: Without dead ends: 15754 [2020-07-20 17:12:32,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-20 17:12:33,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-20 17:12:33,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-20 17:12:33,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-20 17:12:33,075 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-20 17:12:33,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,076 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-20 17:12:33,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,076 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-20 17:12:33,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 17:12:33,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,102 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:33,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,315 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,316 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-20 17:12:33,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302704290] [2020-07-20 17:12:33,316 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,507 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302704290] [2020-07-20 17:12:33,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857557488] [2020-07-20 17:12:33,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,545 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-20 17:12:33,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,726 INFO L93 Difference]: Finished difference Result 23820 states and 30216 transitions. [2020-07-20 17:12:33,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,727 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 17:12:33,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,766 INFO L225 Difference]: With dead ends: 23820 [2020-07-20 17:12:33,766 INFO L226 Difference]: Without dead ends: 16138 [2020-07-20 17:12:33,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16138 states. [2020-07-20 17:12:34,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16138 to 16136. [2020-07-20 17:12:34,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16136 states. [2020-07-20 17:12:34,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16136 states to 16136 states and 20230 transitions. [2020-07-20 17:12:34,109 INFO L78 Accepts]: Start accepts. Automaton has 16136 states and 20230 transitions. Word has length 30 [2020-07-20 17:12:34,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,110 INFO L479 AbstractCegarLoop]: Abstraction has 16136 states and 20230 transitions. [2020-07-20 17:12:34,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,110 INFO L276 IsEmpty]: Start isEmpty. Operand 16136 states and 20230 transitions. [2020-07-20 17:12:34,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 17:12:34,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,132 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:34,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,346 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,346 INFO L82 PathProgramCache]: Analyzing trace with hash 791308478, now seen corresponding path program 1 times [2020-07-20 17:12:34,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873528973] [2020-07-20 17:12:34,346 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,399 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,400 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873528973] [2020-07-20 17:12:34,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211590124] [2020-07-20 17:12:34,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,401 INFO L87 Difference]: Start difference. First operand 16136 states and 20230 transitions. Second operand 3 states. [2020-07-20 17:12:35,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,141 INFO L93 Difference]: Finished difference Result 26636 states and 33544 transitions. [2020-07-20 17:12:35,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,142 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 17:12:35,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,208 INFO L225 Difference]: With dead ends: 26636 [2020-07-20 17:12:35,209 INFO L226 Difference]: Without dead ends: 26634 [2020-07-20 17:12:35,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26634 states. [2020-07-20 17:12:35,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26634 to 24584. [2020-07-20 17:12:35,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-20 17:12:35,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-20 17:12:35,777 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-20 17:12:35,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:35,778 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-20 17:12:35,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:35,778 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-20 17:12:35,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 17:12:35,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,818 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:36,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,035 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:36,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:36,036 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-20 17:12:36,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:36,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68618679] [2020-07-20 17:12:36,036 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:36,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:36,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:36,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:36,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:36,083 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:36,084 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:36,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68618679] [2020-07-20 17:12:36,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:36,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:36,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138012742] [2020-07-20 17:12:36,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:36,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:36,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:36,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,086 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-20 17:12:36,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:36,546 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-20 17:12:36,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:36,547 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-20 17:12:36,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:36,607 INFO L225 Difference]: With dead ends: 55308 [2020-07-20 17:12:36,607 INFO L226 Difference]: Without dead ends: 31242 [2020-07-20 17:12:36,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:36,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-20 17:12:37,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-20 17:12:37,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-20 17:12:37,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-20 17:12:37,660 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-20 17:12:37,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:37,660 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-20 17:12:37,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:37,660 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-20 17:12:37,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 17:12:37,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:37,690 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:37,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,904 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-20 17:12:37,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916322465] [2020-07-20 17:12:37,905 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:37,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916322465] [2020-07-20 17:12:37,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879070940] [2020-07-20 17:12:37,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,955 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-20 17:12:38,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:38,197 INFO L93 Difference]: Finished difference Result 46860 states and 55048 transitions. [2020-07-20 17:12:38,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:38,198 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 17:12:38,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:38,253 INFO L225 Difference]: With dead ends: 46860 [2020-07-20 17:12:38,253 INFO L226 Difference]: Without dead ends: 31754 [2020-07-20 17:12:38,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31754 states. [2020-07-20 17:12:39,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31754 to 31752. [2020-07-20 17:12:39,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31752 states. [2020-07-20 17:12:39,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31752 states to 31752 states and 36870 transitions. [2020-07-20 17:12:39,924 INFO L78 Accepts]: Start accepts. Automaton has 31752 states and 36870 transitions. Word has length 31 [2020-07-20 17:12:39,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,925 INFO L479 AbstractCegarLoop]: Abstraction has 31752 states and 36870 transitions. [2020-07-20 17:12:39,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,925 INFO L276 IsEmpty]: Start isEmpty. Operand 31752 states and 36870 transitions. [2020-07-20 17:12:39,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 17:12:39,950 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:39,950 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:40,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,166 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:40,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:40,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1776078785, now seen corresponding path program 1 times [2020-07-20 17:12:40,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:40,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691100803] [2020-07-20 17:12:40,168 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:40,206 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:40,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:40,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:40,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:40,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:40,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:40,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691100803] [2020-07-20 17:12:40,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:40,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:40,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163435472] [2020-07-20 17:12:40,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:40,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:40,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:40,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:40,224 INFO L87 Difference]: Start difference. First operand 31752 states and 36870 transitions. Second operand 3 states. [2020-07-20 17:12:40,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:40,573 INFO L93 Difference]: Finished difference Result 51210 states and 58887 transitions. [2020-07-20 17:12:40,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:40,574 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 17:12:40,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:40,668 INFO L225 Difference]: With dead ends: 51210 [2020-07-20 17:12:40,668 INFO L226 Difference]: Without dead ends: 51208 [2020-07-20 17:12:40,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:40,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51208 states. [2020-07-20 17:12:41,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51208 to 49160. [2020-07-20 17:12:41,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49160 states. [2020-07-20 17:12:41,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49160 states to 49160 states and 55814 transitions. [2020-07-20 17:12:41,951 INFO L78 Accepts]: Start accepts. Automaton has 49160 states and 55814 transitions. Word has length 31 [2020-07-20 17:12:41,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:41,951 INFO L479 AbstractCegarLoop]: Abstraction has 49160 states and 55814 transitions. [2020-07-20 17:12:41,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:41,951 INFO L276 IsEmpty]: Start isEmpty. Operand 49160 states and 55814 transitions. [2020-07-20 17:12:41,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 17:12:41,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:41,996 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:42,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,197 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:42,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:42,198 INFO L82 PathProgramCache]: Analyzing trace with hash 764961535, now seen corresponding path program 1 times [2020-07-20 17:12:42,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:42,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135431578] [2020-07-20 17:12:42,198 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:42,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:42,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:42,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:42,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:42,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:42,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:42,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135431578] [2020-07-20 17:12:42,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:42,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:42,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263139637] [2020-07-20 17:12:42,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:42,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:42,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:42,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:42,247 INFO L87 Difference]: Start difference. First operand 49160 states and 55814 transitions. Second operand 3 states. [2020-07-20 17:12:43,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:43,042 INFO L93 Difference]: Finished difference Result 109576 states and 122374 transitions. [2020-07-20 17:12:43,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:43,043 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-20 17:12:43,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:43,043 INFO L225 Difference]: With dead ends: 109576 [2020-07-20 17:12:43,043 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:43,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:43,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:43,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:43,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:43,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:43,155 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-20 17:12:43,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:43,155 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:43,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:43,155 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:43,155 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:43,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:43,372 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:43,434 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:43,434 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:43,434 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:43,434 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:43,434 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-20 17:12:43,435 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-20 17:12:43,436 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,437 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-20 17:12:43,438 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-20 17:12:43,439 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-20 17:12:43,440 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,440 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-20 17:12:43,440 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-20 17:12:43,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:43 BoogieIcfgContainer [2020-07-20 17:12:43,459 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:43,462 INFO L168 Benchmark]: Toolchain (without parser) took 22736.18 ms. Allocated memory was 135.8 MB in the beginning and 1.0 GB in the end (delta: 893.4 MB). Free memory was 100.9 MB in the beginning and 227.7 MB in the end (delta: -126.8 MB). Peak memory consumption was 766.6 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,464 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,465 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.26 ms. Allocated memory is still 135.8 MB. Free memory was 100.5 MB in the beginning and 89.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,465 INFO L168 Benchmark]: Boogie Preprocessor took 121.85 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 177.6 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,465 INFO L168 Benchmark]: RCFGBuilder took 427.61 ms. Allocated memory is still 199.2 MB. Free memory was 177.6 MB in the beginning and 156.5 MB in the end (delta: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,466 INFO L168 Benchmark]: TraceAbstraction took 21868.52 ms. Allocated memory was 199.2 MB in the beginning and 1.0 GB in the end (delta: 829.9 MB). Free memory was 156.5 MB in the beginning and 227.7 MB in the end (delta: -71.2 MB). Peak memory consumption was 758.7 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:43,468 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.26 ms. Allocated memory is still 135.8 MB. Free memory was 100.5 MB in the beginning and 89.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.85 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 177.6 MB in the end (delta: -88.0 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 427.61 ms. Allocated memory is still 199.2 MB. Free memory was 177.6 MB in the beginning and 156.5 MB in the end (delta: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 21868.52 ms. Allocated memory was 199.2 MB in the beginning and 1.0 GB in the end (delta: 829.9 MB). Free memory was 156.5 MB in the beginning and 227.7 MB in the end (delta: -71.2 MB). Peak memory consumption was 758.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 21.7s, OverallIterations: 31, TraceHistogramMax: 1, AutomataDifference: 5.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2877 SDtfs, 1405 SDslu, 1967 SDs, 0 SdLazy, 165 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 777 GetRequests, 746 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49160occurred in iteration=30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 6.7s AutomataMinimizationTime, 31 MinimizatonAttempts, 8224 StatesRemovedByMinimization, 30 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 808 NumberOfCodeBlocks, 808 NumberOfCodeBlocksAsserted, 124 NumberOfCheckSat, 777 ConstructedInterpolants, 0 QuantifiedInterpolants, 39912 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3761 ConjunctsInSsa, 93 ConjunctsInUnsatCore, 31 InterpolantComputations, 31 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...