/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:05:49,526 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:05:49,530 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:05:49,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:05:49,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:05:49,555 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:05:49,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:05:49,559 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:05:49,560 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:05:49,562 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:05:49,564 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:05:49,565 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:05:49,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:05:49,567 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:05:49,568 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:05:49,570 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:05:49,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:05:49,571 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:05:49,574 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:05:49,577 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:05:49,579 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:05:49,581 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:05:49,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:05:49,585 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:05:49,588 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:05:49,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:05:49,602 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:05:49,603 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:05:49,605 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 01:05:49,624 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:05:49,624 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:05:49,626 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:05:49,626 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:05:49,626 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:05:49,627 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:05:49,627 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:05:49,627 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:05:49,627 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:05:49,627 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:05:49,628 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:05:49,628 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:05:49,628 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:05:49,628 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:05:49,629 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:05:49,629 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:05:49,629 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:05:49,629 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:05:49,629 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:05:49,630 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:05:49,630 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:05:49,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:49,631 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:05:49,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:05:49,631 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:05:49,631 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:05:49,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:49,631 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:05:49,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:05:49,632 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:05:50,087 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:05:50,125 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:05:50,131 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:05:50,133 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:05:50,134 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:05:50,135 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 01:05:50,262 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b041cc17/da05c99668a2461fbc63f58cf38a6ff6/FLAG03c43536e [2020-07-21 01:05:51,062 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:05:51,063 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 01:05:51,077 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b041cc17/da05c99668a2461fbc63f58cf38a6ff6/FLAG03c43536e [2020-07-21 01:05:51,106 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b041cc17/da05c99668a2461fbc63f58cf38a6ff6 [2020-07-21 01:05:51,126 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:05:51,132 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:05:51,134 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:51,135 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:05:51,141 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:05:51,144 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,149 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12e96d29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51, skipping insertion in model container [2020-07-21 01:05:51,150 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,164 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:05:51,202 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:05:51,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:51,504 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:05:51,538 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:51,563 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:05:51,565 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51 WrapperNode [2020-07-21 01:05:51,565 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:51,567 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:05:51,568 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:05:51,568 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:05:51,728 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,750 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,761 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,765 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... [2020-07-21 01:05:51,772 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:05:51,773 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:05:51,774 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:05:51,774 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:05:51,777 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:51,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:05:51,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:05:51,876 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:05:51,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:05:51,877 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:05:51,877 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:05:51,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:05:51,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:05:52,380 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:05:52,380 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:05:52,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:52 BoogieIcfgContainer [2020-07-21 01:05:52,390 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:05:52,406 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:05:52,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:05:52,419 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:05:52,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:05:51" (1/3) ... [2020-07-21 01:05:52,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@780f6764 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:52, skipping insertion in model container [2020-07-21 01:05:52,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:51" (2/3) ... [2020-07-21 01:05:52,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@780f6764 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:52, skipping insertion in model container [2020-07-21 01:05:52,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:52" (3/3) ... [2020-07-21 01:05:52,427 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-21 01:05:52,445 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:05:52,459 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:05:52,477 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:05:52,519 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:05:52,520 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:05:52,520 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:05:52,520 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:05:52,520 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:05:52,520 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:05:52,521 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:05:52,521 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:05:52,555 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-21 01:05:52,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:05:52,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:52,568 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:52,568 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:52,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:52,577 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-21 01:05:52,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:52,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924850828] [2020-07-21 01:05:52,590 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:52,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:52,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:52,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:52,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:52,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:52,805 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:52,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924850828] [2020-07-21 01:05:52,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:52,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:52,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896070386] [2020-07-21 01:05:52,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:52,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:52,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:52,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:52,853 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-21 01:05:52,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:52,948 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-21 01:05:52,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:52,952 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 01:05:52,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:52,974 INFO L225 Difference]: With dead ends: 75 [2020-07-21 01:05:52,975 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 01:05:52,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 01:05:53,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-21 01:05:53,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 01:05:53,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-21 01:05:53,060 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-21 01:05:53,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,062 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-21 01:05:53,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,062 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-21 01:05:53,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:05:53,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,064 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:53,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,283 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:53,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:53,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-21 01:05:53,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:53,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914403959] [2020-07-21 01:05:53,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:53,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:53,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:53,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:53,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:53,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:53,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914403959] [2020-07-21 01:05:53,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:53,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:53,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578631743] [2020-07-21 01:05:53,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:53,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:53,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:53,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,460 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-21 01:05:53,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:53,503 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-21 01:05:53,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:53,504 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 01:05:53,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:53,510 INFO L225 Difference]: With dead ends: 97 [2020-07-21 01:05:53,511 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 01:05:53,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 01:05:53,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-21 01:05:53,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 01:05:53,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-21 01:05:53,531 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-21 01:05:53,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,532 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-21 01:05:53,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,532 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-21 01:05:53,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:53,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:53,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,753 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:53,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:53,754 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-21 01:05:53,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:53,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960950712] [2020-07-21 01:05:53,755 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:53,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:53,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:53,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:53,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:53,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:53,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960950712] [2020-07-21 01:05:53,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:53,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:53,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464397302] [2020-07-21 01:05:53,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:53,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:53,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:53,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,861 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-21 01:05:53,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:53,910 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-07-21 01:05:53,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:53,911 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:53,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:53,913 INFO L225 Difference]: With dead ends: 90 [2020-07-21 01:05:53,914 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 01:05:53,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 01:05:53,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-07-21 01:05:53,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 01:05:53,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-07-21 01:05:53,930 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-07-21 01:05:53,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,931 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-07-21 01:05:53,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,931 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-07-21 01:05:53,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:53,932 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,933 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:54,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,150 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,151 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-07-21 01:05:54,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248850256] [2020-07-21 01:05:54,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,237 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248850256] [2020-07-21 01:05:54,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700236107] [2020-07-21 01:05:54,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,242 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-07-21 01:05:54,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,291 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-07-21 01:05:54,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:54,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,295 INFO L225 Difference]: With dead ends: 112 [2020-07-21 01:05:54,296 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 01:05:54,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 01:05:54,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 01:05:54,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 01:05:54,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-21 01:05:54,316 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-21 01:05:54,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,316 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-21 01:05:54,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,317 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-21 01:05:54,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:54,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,319 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:54,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,536 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-21 01:05:54,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719750841] [2020-07-21 01:05:54,539 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,633 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719750841] [2020-07-21 01:05:54,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000007703] [2020-07-21 01:05:54,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,656 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-21 01:05:54,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,688 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-21 01:05:54,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,689 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:54,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,691 INFO L225 Difference]: With dead ends: 184 [2020-07-21 01:05:54,691 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 01:05:54,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 01:05:54,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-21 01:05:54,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 01:05:54,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-21 01:05:54,712 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-21 01:05:54,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,713 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-21 01:05:54,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,713 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-21 01:05:54,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:54,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,715 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] [2020-07-21 01:05:54,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,929 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,930 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-21 01:05:54,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535997469] [2020-07-21 01:05:54,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,982 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,005 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535997469] [2020-07-21 01:05:55,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045348544] [2020-07-21 01:05:55,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,010 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-21 01:05:55,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,036 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-07-21 01:05:55,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,037 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:55,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,039 INFO L225 Difference]: With dead ends: 165 [2020-07-21 01:05:55,040 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 01:05:55,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 01:05:55,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-07-21 01:05:55,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 01:05:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-07-21 01:05:55,057 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-07-21 01:05:55,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,058 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-07-21 01:05:55,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,059 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-07-21 01:05:55,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:55,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,060 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] [2020-07-21 01:05:55,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,276 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,277 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-07-21 01:05:55,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253035944] [2020-07-21 01:05:55,278 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253035944] [2020-07-21 01:05:55,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643949717] [2020-07-21 01:05:55,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,353 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-07-21 01:05:55,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,389 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-07-21 01:05:55,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,389 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:55,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,391 INFO L225 Difference]: With dead ends: 204 [2020-07-21 01:05:55,392 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 01:05:55,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 01:05:55,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-07-21 01:05:55,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 01:05:55,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-21 01:05:55,416 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-21 01:05:55,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,416 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-21 01:05:55,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,417 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-21 01:05:55,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:55,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,419 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] [2020-07-21 01:05:55,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,630 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-21 01:05:55,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101593716] [2020-07-21 01:05:55,632 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,694 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,695 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101593716] [2020-07-21 01:05:55,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555032490] [2020-07-21 01:05:55,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,699 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-21 01:05:55,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,743 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-21 01:05:55,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,745 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:55,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,747 INFO L225 Difference]: With dead ends: 352 [2020-07-21 01:05:55,748 INFO L226 Difference]: Without dead ends: 210 [2020-07-21 01:05:55,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-21 01:05:55,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-21 01:05:55,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 01:05:55,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-21 01:05:55,774 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-21 01:05:55,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,775 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-21 01:05:55,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,775 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-21 01:05:55,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:55,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,784 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] [2020-07-21 01:05:55,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,986 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,988 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-21 01:05:55,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962712786] [2020-07-21 01:05:55,989 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 [2020-07-21 01:05:56,033 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:05:56,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,054 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962712786] [2020-07-21 01:05:56,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624089081] [2020-07-21 01:05:56,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,057 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-21 01:05:56,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,085 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 01:05:56,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,086 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:56,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,088 INFO L225 Difference]: With dead ends: 312 [2020-07-21 01:05:56,089 INFO L226 Difference]: Without dead ends: 214 [2020-07-21 01:05:56,091 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 [2020-07-21 01:05:56,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-21 01:05:56,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 212. [2020-07-21 01:05:56,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-21 01:05:56,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 338 transitions. [2020-07-21 01:05:56,115 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 338 transitions. Word has length 21 [2020-07-21 01:05:56,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,116 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 338 transitions. [2020-07-21 01:05:56,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,116 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 338 transitions. [2020-07-21 01:05:56,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:56,119 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,119 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] [2020-07-21 01:05:56,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,336 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,337 INFO L82 PathProgramCache]: Analyzing trace with hash 91259814, now seen corresponding path program 1 times [2020-07-21 01:05:56,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424920899] [2020-07-21 01:05:56,339 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 [2020-07-21 01:05:56,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424920899] [2020-07-21 01:05:56,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994024472] [2020-07-21 01:05:56,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,426 INFO L87 Difference]: Start difference. First operand 212 states and 338 transitions. Second operand 3 states. [2020-07-21 01:05:56,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,497 INFO L93 Difference]: Finished difference Result 380 states and 616 transitions. [2020-07-21 01:05:56,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,505 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:56,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,510 INFO L225 Difference]: With dead ends: 380 [2020-07-21 01:05:56,512 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 01:05:56,514 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 [2020-07-21 01:05:56,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 01:05:56,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 296. [2020-07-21 01:05:56,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 01:05:56,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-07-21 01:05:56,577 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-07-21 01:05:56,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,578 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-07-21 01:05:56,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,578 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-07-21 01:05:56,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:56,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,586 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] [2020-07-21 01:05:56,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,805 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,806 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-07-21 01:05:56,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921959442] [2020-07-21 01:05:56,808 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 [2020-07-21 01:05:56,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921959442] [2020-07-21 01:05:56,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865154037] [2020-07-21 01:05:56,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,884 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-07-21 01:05:56,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,924 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-07-21 01:05:56,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,926 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:56,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,930 INFO L225 Difference]: With dead ends: 684 [2020-07-21 01:05:56,930 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 01:05:56,933 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 [2020-07-21 01:05:56,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 01:05:56,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-07-21 01:05:56,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 01:05:56,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-07-21 01:05:56,958 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-07-21 01:05:56,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,958 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-07-21 01:05:56,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,959 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-07-21 01:05:56,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:56,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,962 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] [2020-07-21 01:05:57,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,177 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-07-21 01:05:57,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102530915] [2020-07-21 01:05:57,179 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 [2020-07-21 01:05:57,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,251 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,252 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102530915] [2020-07-21 01:05:57,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859357094] [2020-07-21 01:05:57,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,256 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-07-21 01:05:57,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,289 INFO L93 Difference]: Finished difference Result 600 states and 916 transitions. [2020-07-21 01:05:57,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,290 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:57,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,295 INFO L225 Difference]: With dead ends: 600 [2020-07-21 01:05:57,295 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 01:05:57,297 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 [2020-07-21 01:05:57,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 01:05:57,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 408. [2020-07-21 01:05:57,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 01:05:57,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 614 transitions. [2020-07-21 01:05:57,326 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 614 transitions. Word has length 22 [2020-07-21 01:05:57,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,326 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 614 transitions. [2020-07-21 01:05:57,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,327 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 614 transitions. [2020-07-21 01:05:57,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:57,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,330 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] [2020-07-21 01:05:57,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,546 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1207532573, now seen corresponding path program 1 times [2020-07-21 01:05:57,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295526320] [2020-07-21 01:05:57,550 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 [2020-07-21 01:05:57,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295526320] [2020-07-21 01:05:57,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303823789] [2020-07-21 01:05:57,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,622 INFO L87 Difference]: Start difference. First operand 408 states and 614 transitions. Second operand 3 states. [2020-07-21 01:05:57,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,679 INFO L93 Difference]: Finished difference Result 716 states and 1096 transitions. [2020-07-21 01:05:57,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,680 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:57,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,686 INFO L225 Difference]: With dead ends: 716 [2020-07-21 01:05:57,687 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 01:05:57,688 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 [2020-07-21 01:05:57,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 01:05:57,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 584. [2020-07-21 01:05:57,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 01:05:57,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-07-21 01:05:57,718 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-07-21 01:05:57,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,718 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-07-21 01:05:57,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,719 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-07-21 01:05:57,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:57,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,722 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] [2020-07-21 01:05:57,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,936 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,937 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-07-21 01:05:57,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966602216] [2020-07-21 01:05:57,938 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 [2020-07-21 01:05:57,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,997 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966602216] [2020-07-21 01:05:57,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849245568] [2020-07-21 01:05:58,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,003 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-07-21 01:05:58,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,045 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-07-21 01:05:58,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,046 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:58,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,054 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 01:05:58,055 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 01:05:58,059 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 [2020-07-21 01:05:58,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 01:05:58,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 01:05:58,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 01:05:58,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-07-21 01:05:58,096 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-07-21 01:05:58,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,097 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-07-21 01:05:58,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,097 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-07-21 01:05:58,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:58,099 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,100 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] [2020-07-21 01:05:58,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,315 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-07-21 01:05:58,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159613111] [2020-07-21 01:05:58,317 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 [2020-07-21 01:05:58,358 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,379 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159613111] [2020-07-21 01:05:58,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311305637] [2020-07-21 01:05:58,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,383 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-07-21 01:05:58,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,419 INFO L93 Difference]: Finished difference Result 1164 states and 1656 transitions. [2020-07-21 01:05:58,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,419 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:58,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,425 INFO L225 Difference]: With dead ends: 1164 [2020-07-21 01:05:58,425 INFO L226 Difference]: Without dead ends: 794 [2020-07-21 01:05:58,427 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 [2020-07-21 01:05:58,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-07-21 01:05:58,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 792. [2020-07-21 01:05:58,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-21 01:05:58,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1110 transitions. [2020-07-21 01:05:58,462 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1110 transitions. Word has length 23 [2020-07-21 01:05:58,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,462 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 1110 transitions. [2020-07-21 01:05:58,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,462 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1110 transitions. [2020-07-21 01:05:58,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:58,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,465 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] [2020-07-21 01:05:58,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,680 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1479576731, now seen corresponding path program 1 times [2020-07-21 01:05:58,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882410929] [2020-07-21 01:05:58,682 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 [2020-07-21 01:05:58,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,757 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882410929] [2020-07-21 01:05:58,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275884420] [2020-07-21 01:05:58,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,760 INFO L87 Difference]: Start difference. First operand 792 states and 1110 transitions. Second operand 3 states. [2020-07-21 01:05:58,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,808 INFO L93 Difference]: Finished difference Result 1356 states and 1928 transitions. [2020-07-21 01:05:58,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,809 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:58,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,819 INFO L225 Difference]: With dead ends: 1356 [2020-07-21 01:05:58,819 INFO L226 Difference]: Without dead ends: 1354 [2020-07-21 01:05:58,822 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 [2020-07-21 01:05:58,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-07-21 01:05:58,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1160. [2020-07-21 01:05:58,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1160 states. [2020-07-21 01:05:58,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions. [2020-07-21 01:05:58,875 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23 [2020-07-21 01:05:58,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,876 INFO L479 AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions. [2020-07-21 01:05:58,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,876 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions. [2020-07-21 01:05:58,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:58,880 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,880 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] [2020-07-21 01:05:59,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:59,096 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:59,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:59,097 INFO L82 PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times [2020-07-21 01:05:59,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:59,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109301232] [2020-07-21 01:05:59,098 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 [2020-07-21 01:05:59,160 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:59,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:59,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:59,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:59,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:59,178 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:59,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109301232] [2020-07-21 01:05:59,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:59,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:59,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144337733] [2020-07-21 01:05:59,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:59,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:59,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:59,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,189 INFO L87 Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states. [2020-07-21 01:05:59,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:59,271 INFO L93 Difference]: Finished difference Result 2636 states and 3560 transitions. [2020-07-21 01:05:59,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:59,271 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:59,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:59,286 INFO L225 Difference]: With dead ends: 2636 [2020-07-21 01:05:59,286 INFO L226 Difference]: Without dead ends: 1514 [2020-07-21 01:05:59,293 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 [2020-07-21 01:05:59,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2020-07-21 01:05:59,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512. [2020-07-21 01:05:59,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-07-21 01:05:59,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions. [2020-07-21 01:05:59,391 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23 [2020-07-21 01:05:59,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:59,394 INFO L479 AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions. [2020-07-21 01:05:59,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:59,394 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions. [2020-07-21 01:05:59,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:59,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:59,401 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] [2020-07-21 01:05:59,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:59,616 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:59,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times [2020-07-21 01:05:59,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:59,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958232624] [2020-07-21 01:05:59,620 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 [2020-07-21 01:05:59,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:59,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:59,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:59,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:59,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:59,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:59,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958232624] [2020-07-21 01:05:59,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:59,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:59,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261349379] [2020-07-21 01:05:59,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:59,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:59,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:59,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:59,756 INFO L87 Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states. [2020-07-21 01:05:59,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:59,822 INFO L93 Difference]: Finished difference Result 2268 states and 2968 transitions. [2020-07-21 01:05:59,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:59,823 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:05:59,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:59,834 INFO L225 Difference]: With dead ends: 2268 [2020-07-21 01:05:59,834 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 01:05:59,838 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 [2020-07-21 01:05:59,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 01:05:59,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-21 01:05:59,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 01:05:59,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 1990 transitions. [2020-07-21 01:05:59,909 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 1990 transitions. Word has length 24 [2020-07-21 01:05:59,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:59,910 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 1990 transitions. [2020-07-21 01:05:59,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:59,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 1990 transitions. [2020-07-21 01:05:59,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:59,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:59,914 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] [2020-07-21 01:06:00,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:00,130 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:00,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:00,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1119380424, now seen corresponding path program 1 times [2020-07-21 01:06:00,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:00,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513311394] [2020-07-21 01:06:00,132 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 [2020-07-21 01:06:00,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:00,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:00,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:00,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:00,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:00,202 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:00,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513311394] [2020-07-21 01:06:00,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:00,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:00,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10674494] [2020-07-21 01:06:00,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:00,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:00,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:00,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,210 INFO L87 Difference]: Start difference. First operand 1544 states and 1990 transitions. Second operand 3 states. [2020-07-21 01:06:00,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:00,293 INFO L93 Difference]: Finished difference Result 2572 states and 3336 transitions. [2020-07-21 01:06:00,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:00,294 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:06:00,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:00,311 INFO L225 Difference]: With dead ends: 2572 [2020-07-21 01:06:00,311 INFO L226 Difference]: Without dead ends: 2570 [2020-07-21 01:06:00,318 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 [2020-07-21 01:06:00,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2570 states. [2020-07-21 01:06:00,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2312. [2020-07-21 01:06:00,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2312 states. [2020-07-21 01:06:00,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions. [2020-07-21 01:06:00,429 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24 [2020-07-21 01:06:00,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:00,430 INFO L479 AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions. [2020-07-21 01:06:00,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:00,430 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions. [2020-07-21 01:06:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:06:00,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:00,438 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] [2020-07-21 01:06:00,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:00,653 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:00,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:00,654 INFO L82 PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times [2020-07-21 01:06:00,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:00,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497829312] [2020-07-21 01:06:00,655 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 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 [2020-07-21 01:06:00,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:00,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:00,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:00,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:00,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:00,720 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:00,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497829312] [2020-07-21 01:06:00,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:00,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:00,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753068832] [2020-07-21 01:06:00,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:00,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:00,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:00,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:00,722 INFO L87 Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states. [2020-07-21 01:06:00,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:00,821 INFO L93 Difference]: Finished difference Result 5196 states and 6408 transitions. [2020-07-21 01:06:00,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:00,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:06:00,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:00,841 INFO L225 Difference]: With dead ends: 5196 [2020-07-21 01:06:00,842 INFO L226 Difference]: Without dead ends: 2954 [2020-07-21 01:06:00,849 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 [2020-07-21 01:06:00,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-21 01:06:01,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952. [2020-07-21 01:06:01,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2952 states. [2020-07-21 01:06:01,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions. [2020-07-21 01:06:01,038 INFO L78 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24 [2020-07-21 01:06:01,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:01,038 INFO L479 AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions. [2020-07-21 01:06:01,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:01,038 INFO L276 IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions. [2020-07-21 01:06:01,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:01,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:01,046 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] [2020-07-21 01:06:01,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:01,261 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:01,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:01,262 INFO L82 PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times [2020-07-21 01:06:01,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:01,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185064939] [2020-07-21 01:06:01,263 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 [2020-07-21 01:06:01,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:01,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:01,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:01,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:01,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:01,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:01,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185064939] [2020-07-21 01:06:01,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:01,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:01,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333740415] [2020-07-21 01:06:01,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:01,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:01,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:01,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,328 INFO L87 Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states. [2020-07-21 01:06:01,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:01,408 INFO L93 Difference]: Finished difference Result 4428 states and 5256 transitions. [2020-07-21 01:06:01,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:01,408 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:01,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:01,429 INFO L225 Difference]: With dead ends: 4428 [2020-07-21 01:06:01,430 INFO L226 Difference]: Without dead ends: 3018 [2020-07-21 01:06:01,436 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 [2020-07-21 01:06:01,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3018 states. [2020-07-21 01:06:01,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016. [2020-07-21 01:06:01,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 01:06:01,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions. [2020-07-21 01:06:01,578 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25 [2020-07-21 01:06:01,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:01,578 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions. [2020-07-21 01:06:01,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions. [2020-07-21 01:06:01,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:01,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:01,587 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] [2020-07-21 01:06:01,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:01,801 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:01,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:01,802 INFO L82 PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times [2020-07-21 01:06:01,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:01,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279546913] [2020-07-21 01:06:01,803 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 [2020-07-21 01:06:01,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:01,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:01,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:01,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:01,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:01,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:01,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279546913] [2020-07-21 01:06:01,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:01,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:01,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231713030] [2020-07-21 01:06:01,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:01,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:01,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:01,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:01,867 INFO L87 Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states. [2020-07-21 01:06:02,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:02,028 INFO L93 Difference]: Finished difference Result 8650 states and 9799 transitions. [2020-07-21 01:06:02,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:02,030 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:02,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:02,052 INFO L225 Difference]: With dead ends: 8650 [2020-07-21 01:06:02,052 INFO L226 Difference]: Without dead ends: 3016 [2020-07-21 01:06:02,072 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 [2020-07-21 01:06:02,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2020-07-21 01:06:02,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016. [2020-07-21 01:06:02,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 01:06:02,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions. [2020-07-21 01:06:02,233 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25 [2020-07-21 01:06:02,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:02,234 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions. [2020-07-21 01:06:02,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:02,235 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions. [2020-07-21 01:06:02,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:06:02,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:06:02,244 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] [2020-07-21 01:06:02,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:02,460 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:06:02,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:06:02,461 INFO L82 PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times [2020-07-21 01:06:02,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:06:02,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730036187] [2020-07-21 01:06:02,462 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 [2020-07-21 01:06:02,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:06:02,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:06:02,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:06:02,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:06:02,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:06:02,526 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:06:02,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730036187] [2020-07-21 01:06:02,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:06:02,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:06:02,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817833704] [2020-07-21 01:06:02,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:06:02,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:06:02,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:06:02,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:06:02,529 INFO L87 Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states. [2020-07-21 01:06:02,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:06:02,629 INFO L93 Difference]: Finished difference Result 3016 states and 3270 transitions. [2020-07-21 01:06:02,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:06:02,630 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:06:02,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:06:02,632 INFO L225 Difference]: With dead ends: 3016 [2020-07-21 01:06:02,632 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 01:06:02,639 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 [2020-07-21 01:06:02,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 01:06:02,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 01:06:02,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 01:06:02,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 01:06:02,640 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-21 01:06:02,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:06:02,640 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 01:06:02,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:06:02,641 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 01:06:02,641 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 01:06:02,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:06:02,860 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 01:06:02,971 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 01:06:02,971 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:06:02,971 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:06:02,972 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 01:06:02,972 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 01:06:02,972 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 01:06:02,972 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-21 01:06:02,972 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-21 01:06:02,972 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,973 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-21 01:06:02,973 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,974 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-21 01:06:02,974 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,975 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,975 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-21 01:06:02,975 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-21 01:06:02,976 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-21 01:06:02,976 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-21 01:06:02,976 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-21 01:06:02,977 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,977 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,978 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,978 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,978 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-21 01:06:02,978 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,978 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-21 01:06:02,979 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-21 01:06:02,979 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,979 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,979 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-21 01:06:02,979 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-21 01:06:02,980 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,980 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-21 01:06:02,980 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,980 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:02,980 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-21 01:06:02,980 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-21 01:06:02,981 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 01:06:03,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:06:03 BoogieIcfgContainer [2020-07-21 01:06:03,003 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:06:03,010 INFO L168 Benchmark]: Toolchain (without parser) took 11878.45 ms. Allocated memory was 143.7 MB in the beginning and 290.5 MB in the end (delta: 146.8 MB). Free memory was 100.4 MB in the beginning and 245.5 MB in the end (delta: -145.1 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,015 INFO L168 Benchmark]: CDTParser took 1.29 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,017 INFO L168 Benchmark]: CACSL2BoogieTranslator took 431.84 ms. Allocated memory is still 143.7 MB. Free memory was 100.0 MB in the beginning and 89.6 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,018 INFO L168 Benchmark]: Boogie Preprocessor took 205.11 ms. Allocated memory was 143.7 MB in the beginning and 203.4 MB in the end (delta: 59.8 MB). Free memory was 89.6 MB in the beginning and 181.5 MB in the end (delta: -91.9 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,019 INFO L168 Benchmark]: RCFGBuilder took 616.76 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 163.5 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,019 INFO L168 Benchmark]: TraceAbstraction took 10597.84 ms. Allocated memory was 203.4 MB in the beginning and 290.5 MB in the end (delta: 87.0 MB). Free memory was 163.5 MB in the beginning and 245.5 MB in the end (delta: -82.0 MB). Peak memory consumption was 5.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:06:03,029 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.29 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 431.84 ms. Allocated memory is still 143.7 MB. Free memory was 100.0 MB in the beginning and 89.6 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 205.11 ms. Allocated memory was 143.7 MB in the beginning and 203.4 MB in the end (delta: 59.8 MB). Free memory was 89.6 MB in the beginning and 181.5 MB in the end (delta: -91.9 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 616.76 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 163.5 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10597.84 ms. Allocated memory was 203.4 MB in the beginning and 290.5 MB in the end (delta: 87.0 MB). Free memory was 163.5 MB in the beginning and 245.5 MB in the end (delta: -82.0 MB). Peak memory consumption was 5.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: 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: 33]: 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, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 10.3s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1573 SDtfs, 755 SDslu, 1056 SDs, 0 SdLazy, 121 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 475 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3016occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.2s AutomataMinimizationTime, 23 MinimizatonAttempts, 790 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 498 NumberOfCodeBlocks, 495 NumberOfCodeBlocksAsserted, 91 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2129 ConjunctsInSsa, 69 ConjunctsInUnsatCore, 23 InterpolantComputations, 23 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...