/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --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_9.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:50:18,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:50:18,746 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:50:18,763 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:50:18,764 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:50:18,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:50:18,766 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:50:18,767 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:50:18,769 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:50:18,770 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:50:18,771 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:50:18,772 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:50:18,772 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:50:18,773 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:50:18,774 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:50:18,775 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:50:18,776 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:50:18,777 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:50:18,779 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:50:18,781 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:50:18,782 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:50:18,784 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:50:18,785 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:50:18,785 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:50:18,788 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:50:18,796 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:50:18,797 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:50:18,797 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:50:18,798 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:50:18,814 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:50:18,814 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:50:18,815 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:50:18,816 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:50:18,816 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:50:18,816 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:50:18,816 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:50:18,816 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:50:18,817 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:50:18,817 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:50:18,817 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:50:18,817 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:50:18,817 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:50:18,818 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:50:18,818 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:50:18,818 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:50:18,818 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:50:18,818 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:50:18,819 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:50:18,819 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:50:18,819 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:50:18,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:18,819 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:50:18,820 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:50:18,821 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:50:19,139 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:50:19,152 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:50:19,156 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:50:19,157 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:50:19,158 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:50:19,159 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 13:50:19,242 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/691a4ee2c/dc94b816c1fe4898b7b7e2b3ada4bcd8/FLAG55c8d4941 [2020-07-20 13:50:19,728 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:50:19,729 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 13:50:19,737 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/691a4ee2c/dc94b816c1fe4898b7b7e2b3ada4bcd8/FLAG55c8d4941 [2020-07-20 13:50:20,087 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/691a4ee2c/dc94b816c1fe4898b7b7e2b3ada4bcd8 [2020-07-20 13:50:20,096 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:50:20,099 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:50:20,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:20,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:50:20,104 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:50:20,107 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,110 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8201e09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20, skipping insertion in model container [2020-07-20 13:50:20,110 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,117 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:50:20,137 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:50:20,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:20,298 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:50:20,325 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:20,340 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:50:20,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20 WrapperNode [2020-07-20 13:50:20,341 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:20,342 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:50:20,342 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:50:20,342 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:50:20,356 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,356 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,363 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,450 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,464 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... [2020-07-20 13:50:20,473 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:50:20,474 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:50:20,474 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:50:20,474 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:50:20,475 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:20,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:50:20,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:50:20,537 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:50:20,537 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:50:20,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:50:20,539 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:50:20,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:50:20,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:50:20,898 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:50:20,898 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 13:50:20,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:20 BoogieIcfgContainer [2020-07-20 13:50:20,904 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:50:20,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:50:20,913 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:50:20,919 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:50:20,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:50:20" (1/3) ... [2020-07-20 13:50:20,921 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4165ce5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:20, skipping insertion in model container [2020-07-20 13:50:20,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:20" (2/3) ... [2020-07-20 13:50:20,921 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4165ce5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:20, skipping insertion in model container [2020-07-20 13:50:20,921 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:20" (3/3) ... [2020-07-20 13:50:20,923 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_9.c [2020-07-20 13:50:20,934 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:50:20,943 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:50:20,955 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:50:20,980 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:50:20,981 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:50:20,981 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:50:20,981 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:50:20,981 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:50:20,981 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:50:20,981 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:50:20,982 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:50:21,002 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-20 13:50:21,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:21,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,010 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,010 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,017 INFO L82 PathProgramCache]: Analyzing trace with hash 691982780, now seen corresponding path program 1 times [2020-07-20 13:50:21,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125055182] [2020-07-20 13:50:21,025 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,113 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:21,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125055182] [2020-07-20 13:50:21,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671758390] [2020-07-20 13:50:21,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,197 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 3 states. [2020-07-20 13:50:21,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,280 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-07-20 13:50:21,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,282 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:21,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,299 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:50:21,300 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 13:50:21,305 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 [2020-07-20 13:50:21,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 13:50:21,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-20 13:50:21,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:50:21,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 81 transitions. [2020-07-20 13:50:21,350 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 81 transitions. Word has length 19 [2020-07-20 13:50:21,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,351 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 81 transitions. [2020-07-20 13:50:21,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,352 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 81 transitions. [2020-07-20 13:50:21,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:21,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,353 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,569 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,571 INFO L82 PathProgramCache]: Analyzing trace with hash 950148218, now seen corresponding path program 1 times [2020-07-20 13:50:21,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193805494] [2020-07-20 13:50:21,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,638 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:21,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193805494] [2020-07-20 13:50:21,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602704017] [2020-07-20 13:50:21,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,672 INFO L87 Difference]: Start difference. First operand 46 states and 81 transitions. Second operand 3 states. [2020-07-20 13:50:21,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,715 INFO L93 Difference]: Finished difference Result 107 states and 192 transitions. [2020-07-20 13:50:21,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,719 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:21,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,722 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:50:21,723 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 13:50:21,725 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 [2020-07-20 13:50:21,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 13:50:21,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-07-20 13:50:21,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 13:50:21,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 113 transitions. [2020-07-20 13:50:21,747 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 113 transitions. Word has length 19 [2020-07-20 13:50:21,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,748 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 113 transitions. [2020-07-20 13:50:21,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,748 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 113 transitions. [2020-07-20 13:50:21,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:21,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,751 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] [2020-07-20 13:50:21,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,953 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,955 INFO L82 PathProgramCache]: Analyzing trace with hash -23156596, now seen corresponding path program 1 times [2020-07-20 13:50:21,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158963878] [2020-07-20 13:50:21,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,016 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:22,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158963878] [2020-07-20 13:50:22,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208625301] [2020-07-20 13:50:22,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,039 INFO L87 Difference]: Start difference. First operand 64 states and 113 transitions. Second operand 3 states. [2020-07-20 13:50:22,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,066 INFO L93 Difference]: Finished difference Result 121 states and 215 transitions. [2020-07-20 13:50:22,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:22,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,069 INFO L225 Difference]: With dead ends: 121 [2020-07-20 13:50:22,069 INFO L226 Difference]: Without dead ends: 119 [2020-07-20 13:50:22,069 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 [2020-07-20 13:50:22,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2020-07-20 13:50:22,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 85. [2020-07-20 13:50:22,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-20 13:50:22,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 151 transitions. [2020-07-20 13:50:22,082 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 151 transitions. Word has length 20 [2020-07-20 13:50:22,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,082 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 151 transitions. [2020-07-20 13:50:22,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,083 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 151 transitions. [2020-07-20 13:50:22,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:22,084 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,084 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] [2020-07-20 13:50:22,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,298 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,299 INFO L82 PathProgramCache]: Analyzing trace with hash 235008842, now seen corresponding path program 1 times [2020-07-20 13:50:22,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872175718] [2020-07-20 13:50:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,358 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:22,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872175718] [2020-07-20 13:50:22,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220389526] [2020-07-20 13:50:22,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,378 INFO L87 Difference]: Start difference. First operand 85 states and 151 transitions. Second operand 3 states. [2020-07-20 13:50:22,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,397 INFO L93 Difference]: Finished difference Result 130 states and 227 transitions. [2020-07-20 13:50:22,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,398 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:22,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,400 INFO L225 Difference]: With dead ends: 130 [2020-07-20 13:50:22,400 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 13:50:22,401 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 [2020-07-20 13:50:22,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 13:50:22,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-07-20 13:50:22,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 13:50:22,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 152 transitions. [2020-07-20 13:50:22,412 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 152 transitions. Word has length 20 [2020-07-20 13:50:22,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,412 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 152 transitions. [2020-07-20 13:50:22,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,413 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 152 transitions. [2020-07-20 13:50:22,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:22,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,414 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] [2020-07-20 13:50:22,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,628 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,629 INFO L82 PathProgramCache]: Analyzing trace with hash -351797172, now seen corresponding path program 1 times [2020-07-20 13:50:22,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55765218] [2020-07-20 13:50:22,631 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,696 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:22,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,709 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55765218] [2020-07-20 13:50:22,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487136966] [2020-07-20 13:50:22,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,711 INFO L87 Difference]: Start difference. First operand 88 states and 152 transitions. Second operand 3 states. [2020-07-20 13:50:22,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,745 INFO L93 Difference]: Finished difference Result 204 states and 358 transitions. [2020-07-20 13:50:22,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,746 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:22,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,748 INFO L225 Difference]: With dead ends: 204 [2020-07-20 13:50:22,748 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 13:50:22,749 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 [2020-07-20 13:50:22,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 13:50:22,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2020-07-20 13:50:22,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 13:50:22,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 210 transitions. [2020-07-20 13:50:22,760 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 210 transitions. Word has length 20 [2020-07-20 13:50:22,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,760 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 210 transitions. [2020-07-20 13:50:22,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,760 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 210 transitions. [2020-07-20 13:50:22,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:22,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,762 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,970 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1728757681, now seen corresponding path program 1 times [2020-07-20 13:50:22,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869649454] [2020-07-20 13:50:22,973 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:23,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,027 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869649454] [2020-07-20 13:50:23,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230784589] [2020-07-20 13:50:23,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,029 INFO L87 Difference]: Start difference. First operand 122 states and 210 transitions. Second operand 3 states. [2020-07-20 13:50:23,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,059 INFO L93 Difference]: Finished difference Result 226 states and 394 transitions. [2020-07-20 13:50:23,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:23,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,062 INFO L225 Difference]: With dead ends: 226 [2020-07-20 13:50:23,067 INFO L226 Difference]: Without dead ends: 224 [2020-07-20 13:50:23,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-20 13:50:23,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 166. [2020-07-20 13:50:23,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 13:50:23,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 284 transitions. [2020-07-20 13:50:23,092 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 284 transitions. Word has length 21 [2020-07-20 13:50:23,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,093 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 284 transitions. [2020-07-20 13:50:23,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,094 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 284 transitions. [2020-07-20 13:50:23,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:23,099 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,099 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,301 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1470592243, now seen corresponding path program 1 times [2020-07-20 13:50:23,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163518942] [2020-07-20 13:50:23,303 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,339 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:23,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163518942] [2020-07-20 13:50:23,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092519290] [2020-07-20 13:50:23,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,356 INFO L87 Difference]: Start difference. First operand 166 states and 284 transitions. Second operand 3 states. [2020-07-20 13:50:23,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,390 INFO L93 Difference]: Finished difference Result 390 states and 674 transitions. [2020-07-20 13:50:23,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,391 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:23,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,393 INFO L225 Difference]: With dead ends: 390 [2020-07-20 13:50:23,393 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 13:50:23,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 13:50:23,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 230. [2020-07-20 13:50:23,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-20 13:50:23,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 390 transitions. [2020-07-20 13:50:23,427 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 390 transitions. Word has length 21 [2020-07-20 13:50:23,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,431 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 390 transitions. [2020-07-20 13:50:23,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,432 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 390 transitions. [2020-07-20 13:50:23,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:23,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,434 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,635 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,635 INFO L82 PathProgramCache]: Analyzing trace with hash -2051666173, now seen corresponding path program 1 times [2020-07-20 13:50:23,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1293447264] [2020-07-20 13:50:23,636 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:23,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,687 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1293447264] [2020-07-20 13:50:23,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016329827] [2020-07-20 13:50:23,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,690 INFO L87 Difference]: Start difference. First operand 230 states and 390 transitions. Second operand 3 states. [2020-07-20 13:50:23,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,721 INFO L93 Difference]: Finished difference Result 422 states and 724 transitions. [2020-07-20 13:50:23,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,721 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:23,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,724 INFO L225 Difference]: With dead ends: 422 [2020-07-20 13:50:23,725 INFO L226 Difference]: Without dead ends: 420 [2020-07-20 13:50:23,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2020-07-20 13:50:23,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 322. [2020-07-20 13:50:23,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 322 states. [2020-07-20 13:50:23,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 538 transitions. [2020-07-20 13:50:23,740 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 538 transitions. Word has length 22 [2020-07-20 13:50:23,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,740 INFO L479 AbstractCegarLoop]: Abstraction has 322 states and 538 transitions. [2020-07-20 13:50:23,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,741 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 538 transitions. [2020-07-20 13:50:23,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:23,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,743 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,957 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1793500735, now seen corresponding path program 1 times [2020-07-20 13:50:23,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045727848] [2020-07-20 13:50:23,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:23,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,010 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045727848] [2020-07-20 13:50:24,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898090569] [2020-07-20 13:50:24,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,012 INFO L87 Difference]: Start difference. First operand 322 states and 538 transitions. Second operand 3 states. [2020-07-20 13:50:24,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:24,034 INFO L93 Difference]: Finished difference Result 758 states and 1276 transitions. [2020-07-20 13:50:24,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:24,035 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:24,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:24,038 INFO L225 Difference]: With dead ends: 758 [2020-07-20 13:50:24,038 INFO L226 Difference]: Without dead ends: 444 [2020-07-20 13:50:24,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2020-07-20 13:50:24,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 442. [2020-07-20 13:50:24,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 442 states. [2020-07-20 13:50:24,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 730 transitions. [2020-07-20 13:50:24,058 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 730 transitions. Word has length 22 [2020-07-20 13:50:24,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:24,058 INFO L479 AbstractCegarLoop]: Abstraction has 442 states and 730 transitions. [2020-07-20 13:50:24,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:24,058 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 730 transitions. [2020-07-20 13:50:24,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:24,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:24,060 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, 1, 1, 1] [2020-07-20 13:50:24,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,274 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:24,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:24,275 INFO L82 PathProgramCache]: Analyzing trace with hash 823072804, now seen corresponding path program 1 times [2020-07-20 13:50:24,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:24,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762044834] [2020-07-20 13:50:24,277 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,312 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:24,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:24,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:24,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762044834] [2020-07-20 13:50:24,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653629484] [2020-07-20 13:50:24,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,341 INFO L87 Difference]: Start difference. First operand 442 states and 730 transitions. Second operand 3 states. [2020-07-20 13:50:24,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:24,381 INFO L93 Difference]: Finished difference Result 798 states and 1332 transitions. [2020-07-20 13:50:24,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:24,382 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:24,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:24,387 INFO L225 Difference]: With dead ends: 798 [2020-07-20 13:50:24,387 INFO L226 Difference]: Without dead ends: 796 [2020-07-20 13:50:24,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2020-07-20 13:50:24,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 634. [2020-07-20 13:50:24,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 634 states. [2020-07-20 13:50:24,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 634 states to 634 states and 1026 transitions. [2020-07-20 13:50:24,413 INFO L78 Accepts]: Start accepts. Automaton has 634 states and 1026 transitions. Word has length 23 [2020-07-20 13:50:24,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:24,413 INFO L479 AbstractCegarLoop]: Abstraction has 634 states and 1026 transitions. [2020-07-20 13:50:24,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:24,414 INFO L276 IsEmpty]: Start isEmpty. Operand 634 states and 1026 transitions. [2020-07-20 13:50:24,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:24,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:24,416 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:24,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,630 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:24,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:24,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1081238242, now seen corresponding path program 1 times [2020-07-20 13:50:24,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:24,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955386206] [2020-07-20 13:50:24,632 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:24,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:24,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:24,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955386206] [2020-07-20 13:50:24,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674206224] [2020-07-20 13:50:24,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,691 INFO L87 Difference]: Start difference. First operand 634 states and 1026 transitions. Second operand 3 states. [2020-07-20 13:50:24,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:24,735 INFO L93 Difference]: Finished difference Result 1486 states and 2420 transitions. [2020-07-20 13:50:24,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:24,736 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:24,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:24,742 INFO L225 Difference]: With dead ends: 1486 [2020-07-20 13:50:24,743 INFO L226 Difference]: Without dead ends: 860 [2020-07-20 13:50:24,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2020-07-20 13:50:24,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 858. [2020-07-20 13:50:24,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 858 states. [2020-07-20 13:50:24,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1370 transitions. [2020-07-20 13:50:24,790 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1370 transitions. Word has length 23 [2020-07-20 13:50:24,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:24,790 INFO L479 AbstractCegarLoop]: Abstraction has 858 states and 1370 transitions. [2020-07-20 13:50:24,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:24,791 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1370 transitions. [2020-07-20 13:50:24,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:24,793 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:24,793 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:25,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,007 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:25,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:25,008 INFO L82 PathProgramCache]: Analyzing trace with hash -254331784, now seen corresponding path program 1 times [2020-07-20 13:50:25,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:25,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119687130] [2020-07-20 13:50:25,010 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:25,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:25,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:25,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:25,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:25,064 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:25,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119687130] [2020-07-20 13:50:25,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:25,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:25,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992296496] [2020-07-20 13:50:25,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:25,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:25,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:25,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,067 INFO L87 Difference]: Start difference. First operand 858 states and 1370 transitions. Second operand 3 states. [2020-07-20 13:50:25,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,105 INFO L93 Difference]: Finished difference Result 1518 states and 2444 transitions. [2020-07-20 13:50:25,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,105 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:25,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,114 INFO L225 Difference]: With dead ends: 1518 [2020-07-20 13:50:25,114 INFO L226 Difference]: Without dead ends: 1516 [2020-07-20 13:50:25,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1516 states. [2020-07-20 13:50:25,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1516 to 1258. [2020-07-20 13:50:25,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1258 states. [2020-07-20 13:50:25,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1258 states to 1258 states and 1962 transitions. [2020-07-20 13:50:25,155 INFO L78 Accepts]: Start accepts. Automaton has 1258 states and 1962 transitions. Word has length 24 [2020-07-20 13:50:25,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:25,155 INFO L479 AbstractCegarLoop]: Abstraction has 1258 states and 1962 transitions. [2020-07-20 13:50:25,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:25,155 INFO L276 IsEmpty]: Start isEmpty. Operand 1258 states and 1962 transitions. [2020-07-20 13:50:25,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:25,158 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:25,159 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:25,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,372 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:25,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:25,373 INFO L82 PathProgramCache]: Analyzing trace with hash 3833654, now seen corresponding path program 1 times [2020-07-20 13:50:25,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:25,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204546951] [2020-07-20 13:50:25,374 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:25,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:25,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:25,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:25,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:25,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:25,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204546951] [2020-07-20 13:50:25,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:25,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:25,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365659547] [2020-07-20 13:50:25,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:25,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:25,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:25,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,429 INFO L87 Difference]: Start difference. First operand 1258 states and 1962 transitions. Second operand 3 states. [2020-07-20 13:50:25,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,494 INFO L93 Difference]: Finished difference Result 2926 states and 4588 transitions. [2020-07-20 13:50:25,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,494 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:25,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,506 INFO L225 Difference]: With dead ends: 2926 [2020-07-20 13:50:25,507 INFO L226 Difference]: Without dead ends: 1676 [2020-07-20 13:50:25,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1676 states. [2020-07-20 13:50:25,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1676 to 1674. [2020-07-20 13:50:25,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1674 states. [2020-07-20 13:50:25,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1674 states to 1674 states and 2570 transitions. [2020-07-20 13:50:25,568 INFO L78 Accepts]: Start accepts. Automaton has 1674 states and 2570 transitions. Word has length 24 [2020-07-20 13:50:25,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:25,568 INFO L479 AbstractCegarLoop]: Abstraction has 1674 states and 2570 transitions. [2020-07-20 13:50:25,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:25,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1674 states and 2570 transitions. [2020-07-20 13:50:25,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:25,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:25,572 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:25,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,786 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:25,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:25,787 INFO L82 PathProgramCache]: Analyzing trace with hash 705864697, now seen corresponding path program 1 times [2020-07-20 13:50:25,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:25,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729459407] [2020-07-20 13:50:25,788 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,817 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:25,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:25,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:25,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:25,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:25,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:25,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729459407] [2020-07-20 13:50:25,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:25,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:25,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384423166] [2020-07-20 13:50:25,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:25,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:25,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:25,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,831 INFO L87 Difference]: Start difference. First operand 1674 states and 2570 transitions. Second operand 3 states. [2020-07-20 13:50:25,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,891 INFO L93 Difference]: Finished difference Result 2894 states and 4460 transitions. [2020-07-20 13:50:25,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,892 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:25,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,909 INFO L225 Difference]: With dead ends: 2894 [2020-07-20 13:50:25,909 INFO L226 Difference]: Without dead ends: 2892 [2020-07-20 13:50:25,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2892 states. [2020-07-20 13:50:25,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2892 to 2506. [2020-07-20 13:50:25,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2506 states. [2020-07-20 13:50:25,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2506 states to 2506 states and 3754 transitions. [2020-07-20 13:50:26,000 INFO L78 Accepts]: Start accepts. Automaton has 2506 states and 3754 transitions. Word has length 25 [2020-07-20 13:50:26,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,000 INFO L479 AbstractCegarLoop]: Abstraction has 2506 states and 3754 transitions. [2020-07-20 13:50:26,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,000 INFO L276 IsEmpty]: Start isEmpty. Operand 2506 states and 3754 transitions. [2020-07-20 13:50:26,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:26,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,007 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:26,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,220 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:26,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:26,220 INFO L82 PathProgramCache]: Analyzing trace with hash 964030135, now seen corresponding path program 1 times [2020-07-20 13:50:26,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:26,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782408071] [2020-07-20 13:50:26,221 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:26,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:26,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:26,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:26,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:26,301 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:26,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782408071] [2020-07-20 13:50:26,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:26,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:26,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385760351] [2020-07-20 13:50:26,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:26,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:26,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:26,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,304 INFO L87 Difference]: Start difference. First operand 2506 states and 3754 transitions. Second operand 3 states. [2020-07-20 13:50:26,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:26,410 INFO L93 Difference]: Finished difference Result 3728 states and 5552 transitions. [2020-07-20 13:50:26,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:26,411 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:26,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:26,426 INFO L225 Difference]: With dead ends: 3728 [2020-07-20 13:50:26,426 INFO L226 Difference]: Without dead ends: 2510 [2020-07-20 13:50:26,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2020-07-20 13:50:26,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2508. [2020-07-20 13:50:26,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2508 states. [2020-07-20 13:50:26,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2508 states to 2508 states and 3662 transitions. [2020-07-20 13:50:26,527 INFO L78 Accepts]: Start accepts. Automaton has 2508 states and 3662 transitions. Word has length 25 [2020-07-20 13:50:26,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,527 INFO L479 AbstractCegarLoop]: Abstraction has 2508 states and 3662 transitions. [2020-07-20 13:50:26,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,529 INFO L276 IsEmpty]: Start isEmpty. Operand 2508 states and 3662 transitions. [2020-07-20 13:50:26,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:26,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:26,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,750 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:26,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:26,750 INFO L82 PathProgramCache]: Analyzing trace with hash -624317767, now seen corresponding path program 1 times [2020-07-20 13:50:26,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:26,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114113038] [2020-07-20 13:50:26,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:26,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:26,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:26,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:26,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:26,793 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:26,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114113038] [2020-07-20 13:50:26,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:26,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:26,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52352558] [2020-07-20 13:50:26,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:26,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:26,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:26,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,802 INFO L87 Difference]: Start difference. First operand 2508 states and 3662 transitions. Second operand 3 states. [2020-07-20 13:50:26,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:26,852 INFO L93 Difference]: Finished difference Result 3732 states and 5416 transitions. [2020-07-20 13:50:26,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:26,857 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:26,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:26,872 INFO L225 Difference]: With dead ends: 3732 [2020-07-20 13:50:26,872 INFO L226 Difference]: Without dead ends: 2514 [2020-07-20 13:50:26,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2514 states. [2020-07-20 13:50:26,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2514 to 2512. [2020-07-20 13:50:26,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2512 states. [2020-07-20 13:50:26,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2512 states to 2512 states and 3574 transitions. [2020-07-20 13:50:26,961 INFO L78 Accepts]: Start accepts. Automaton has 2512 states and 3574 transitions. Word has length 25 [2020-07-20 13:50:26,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,963 INFO L479 AbstractCegarLoop]: Abstraction has 2512 states and 3574 transitions. [2020-07-20 13:50:26,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,963 INFO L276 IsEmpty]: Start isEmpty. Operand 2512 states and 3574 transitions. [2020-07-20 13:50:26,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:26,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,969 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:27,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,182 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:27,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:27,182 INFO L82 PathProgramCache]: Analyzing trace with hash -1645386121, now seen corresponding path program 1 times [2020-07-20 13:50:27,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:27,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653977097] [2020-07-20 13:50:27,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:27,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:27,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:27,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:27,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:27,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:27,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653977097] [2020-07-20 13:50:27,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:27,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:27,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904915677] [2020-07-20 13:50:27,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:27,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:27,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:27,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,237 INFO L87 Difference]: Start difference. First operand 2512 states and 3574 transitions. Second operand 3 states. [2020-07-20 13:50:27,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:27,304 INFO L93 Difference]: Finished difference Result 5780 states and 8248 transitions. [2020-07-20 13:50:27,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:27,305 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:27,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:27,323 INFO L225 Difference]: With dead ends: 5780 [2020-07-20 13:50:27,324 INFO L226 Difference]: Without dead ends: 3282 [2020-07-20 13:50:27,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3282 states. [2020-07-20 13:50:27,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3282 to 3280. [2020-07-20 13:50:27,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3280 states. [2020-07-20 13:50:27,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3280 states to 3280 states and 4566 transitions. [2020-07-20 13:50:27,495 INFO L78 Accepts]: Start accepts. Automaton has 3280 states and 4566 transitions. Word has length 25 [2020-07-20 13:50:27,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:27,496 INFO L479 AbstractCegarLoop]: Abstraction has 3280 states and 4566 transitions. [2020-07-20 13:50:27,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:27,496 INFO L276 IsEmpty]: Start isEmpty. Operand 3280 states and 4566 transitions. [2020-07-20 13:50:27,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:27,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:27,502 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:27,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,715 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:27,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:27,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1119659565, now seen corresponding path program 1 times [2020-07-20 13:50:27,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:27,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051535744] [2020-07-20 13:50:27,716 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:27,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:27,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:27,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:27,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:27,763 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:27,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051535744] [2020-07-20 13:50:27,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:27,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:27,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067897116] [2020-07-20 13:50:27,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:27,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:27,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:27,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,765 INFO L87 Difference]: Start difference. First operand 3280 states and 4566 transitions. Second operand 3 states. [2020-07-20 13:50:27,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:27,869 INFO L93 Difference]: Finished difference Result 9684 states and 13400 transitions. [2020-07-20 13:50:27,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:27,870 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:27,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:27,902 INFO L225 Difference]: With dead ends: 9684 [2020-07-20 13:50:27,903 INFO L226 Difference]: Without dead ends: 6418 [2020-07-20 13:50:27,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6418 states. [2020-07-20 13:50:28,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6418 to 6416. [2020-07-20 13:50:28,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6416 states. [2020-07-20 13:50:28,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6416 states to 6416 states and 8598 transitions. [2020-07-20 13:50:28,099 INFO L78 Accepts]: Start accepts. Automaton has 6416 states and 8598 transitions. Word has length 26 [2020-07-20 13:50:28,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:28,099 INFO L479 AbstractCegarLoop]: Abstraction has 6416 states and 8598 transitions. [2020-07-20 13:50:28,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:28,099 INFO L276 IsEmpty]: Start isEmpty. Operand 6416 states and 8598 transitions. [2020-07-20 13:50:28,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:50:28,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:28,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:28,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:28,323 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:28,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:28,323 INFO L82 PathProgramCache]: Analyzing trace with hash 861494127, now seen corresponding path program 1 times [2020-07-20 13:50:28,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:28,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156476112] [2020-07-20 13:50:28,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:28,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:28,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:28,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:28,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:28,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:28,369 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:28,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156476112] [2020-07-20 13:50:28,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:28,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:28,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154836481] [2020-07-20 13:50:28,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:28,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:28,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:28,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:28,371 INFO L87 Difference]: Start difference. First operand 6416 states and 8598 transitions. Second operand 3 states. [2020-07-20 13:50:28,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:28,519 INFO L93 Difference]: Finished difference Result 6932 states and 9368 transitions. [2020-07-20 13:50:28,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:28,520 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 13:50:28,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:28,540 INFO L225 Difference]: With dead ends: 6932 [2020-07-20 13:50:28,540 INFO L226 Difference]: Without dead ends: 6930 [2020-07-20 13:50:28,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:28,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6930 states. [2020-07-20 13:50:28,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6930 to 6416. [2020-07-20 13:50:28,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6416 states. [2020-07-20 13:50:28,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6416 states to 6416 states and 8470 transitions. [2020-07-20 13:50:28,703 INFO L78 Accepts]: Start accepts. Automaton has 6416 states and 8470 transitions. Word has length 26 [2020-07-20 13:50:28,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:28,704 INFO L479 AbstractCegarLoop]: Abstraction has 6416 states and 8470 transitions. [2020-07-20 13:50:28,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:28,704 INFO L276 IsEmpty]: Start isEmpty. Operand 6416 states and 8470 transitions. [2020-07-20 13:50:28,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:28,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:28,713 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:28,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:28,930 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:28,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:28,930 INFO L82 PathProgramCache]: Analyzing trace with hash 349924238, now seen corresponding path program 1 times [2020-07-20 13:50:28,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:28,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073936497] [2020-07-20 13:50:28,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:28,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:28,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:28,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:28,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:28,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:28,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:28,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073936497] [2020-07-20 13:50:28,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:28,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:28,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021925762] [2020-07-20 13:50:28,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:28,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:28,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:28,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:28,980 INFO L87 Difference]: Start difference. First operand 6416 states and 8470 transitions. Second operand 3 states. [2020-07-20 13:50:29,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:29,127 INFO L93 Difference]: Finished difference Result 10514 states and 13719 transitions. [2020-07-20 13:50:29,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:29,128 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:29,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:29,149 INFO L225 Difference]: With dead ends: 10514 [2020-07-20 13:50:29,150 INFO L226 Difference]: Without dead ends: 10512 [2020-07-20 13:50:29,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:29,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10512 states. [2020-07-20 13:50:29,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10512 to 10000. [2020-07-20 13:50:29,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10000 states. [2020-07-20 13:50:29,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10000 states to 10000 states and 12950 transitions. [2020-07-20 13:50:29,445 INFO L78 Accepts]: Start accepts. Automaton has 10000 states and 12950 transitions. Word has length 27 [2020-07-20 13:50:29,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:29,446 INFO L479 AbstractCegarLoop]: Abstraction has 10000 states and 12950 transitions. [2020-07-20 13:50:29,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:29,446 INFO L276 IsEmpty]: Start isEmpty. Operand 10000 states and 12950 transitions. [2020-07-20 13:50:29,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:50:29,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:29,464 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:29,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:29,678 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:29,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:29,678 INFO L82 PathProgramCache]: Analyzing trace with hash 608089676, now seen corresponding path program 1 times [2020-07-20 13:50:29,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:29,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121742493] [2020-07-20 13:50:29,679 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:29,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:29,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:29,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:29,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:29,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:29,728 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:29,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121742493] [2020-07-20 13:50:29,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:29,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:29,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574518989] [2020-07-20 13:50:29,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:29,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:29,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:29,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:29,730 INFO L87 Difference]: Start difference. First operand 10000 states and 12950 transitions. Second operand 3 states. [2020-07-20 13:50:29,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:29,917 INFO L93 Difference]: Finished difference Result 22544 states and 29078 transitions. [2020-07-20 13:50:29,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:29,918 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 13:50:29,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:29,918 INFO L225 Difference]: With dead ends: 22544 [2020-07-20 13:50:29,918 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:50:29,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:29,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:50:29,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:50:29,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:50:29,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:50:29,952 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-20 13:50:29,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:29,952 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:50:29,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:29,953 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:50:29,953 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:50:30,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:30,156 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:50:30,225 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:50:30,225 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:30,225 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:30,225 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:50:30,225 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:50:30,225 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L93-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 149) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L85-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L110(line 110) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L77-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L135(line 135) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L69-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,226 INFO L268 CegarLoopResult]: For program point L61(lines 61 63) no Hoare annotation was computed. [2020-07-20 13:50:30,227 INFO L268 CegarLoopResult]: For program point L61-2(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,227 INFO L268 CegarLoopResult]: For program point L119-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,227 INFO L268 CegarLoopResult]: For program point L120(line 120) no Hoare annotation was computed. [2020-07-20 13:50:30,227 INFO L271 CegarLoopResult]: At program point L145(lines 5 149) the Hoare annotation is: true [2020-07-20 13:50:30,227 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 149) no Hoare annotation was computed. [2020-07-20 13:50:30,229 INFO L268 CegarLoopResult]: For program point L104-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,229 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 13:50:30,229 INFO L268 CegarLoopResult]: For program point L129-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,229 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 147) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 149) the Hoare annotation is: true [2020-07-20 13:50:30,230 INFO L268 CegarLoopResult]: For program point L105(line 105) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L268 CegarLoopResult]: For program point L130(line 130) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L268 CegarLoopResult]: For program point L89-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L268 CegarLoopResult]: For program point L114-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L268 CegarLoopResult]: For program point L81-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,230 INFO L271 CegarLoopResult]: At program point L139-1(lines 36 144) the Hoare annotation is: true [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L73-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L65-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L115(line 115) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L140(line 140) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L264 CegarLoopResult]: At program point L140-1(lines 5 149) the Hoare annotation is: false [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L99-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L124-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,231 INFO L268 CegarLoopResult]: For program point L100(line 100) no Hoare annotation was computed. [2020-07-20 13:50:30,232 INFO L268 CegarLoopResult]: For program point L125(line 125) no Hoare annotation was computed. [2020-07-20 13:50:30,232 INFO L268 CegarLoopResult]: For program point L109-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,232 INFO L268 CegarLoopResult]: For program point L134-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 13:50:30,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:50:30 BoogieIcfgContainer [2020-07-20 13:50:30,249 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:50:30,253 INFO L168 Benchmark]: Toolchain (without parser) took 10153.18 ms. Allocated memory was 138.4 MB in the beginning and 336.6 MB in the end (delta: 198.2 MB). Free memory was 103.7 MB in the beginning and 122.6 MB in the end (delta: -18.9 MB). Peak memory consumption was 179.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,253 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,255 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.65 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 92.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,261 INFO L168 Benchmark]: Boogie Preprocessor took 131.66 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.8 MB in the beginning and 181.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,261 INFO L168 Benchmark]: RCFGBuilder took 430.64 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 162.4 MB in the end (delta: 18.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,264 INFO L168 Benchmark]: TraceAbstraction took 9336.91 ms. Allocated memory was 202.4 MB in the beginning and 336.6 MB in the end (delta: 134.2 MB). Free memory was 161.7 MB in the beginning and 122.6 MB in the end (delta: 39.0 MB). Peak memory consumption was 173.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:30,266 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 240.65 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 92.8 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.66 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.8 MB in the beginning and 181.1 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 430.64 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 162.4 MB in the end (delta: 18.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9336.91 ms. Allocated memory was 202.4 MB in the beginning and 336.6 MB in the end (delta: 134.2 MB). Free memory was 161.7 MB in the beginning and 122.6 MB in the end (delta: 39.0 MB). Peak memory consumption was 173.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 147]: 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: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.1s, OverallIterations: 21, TraceHistogramMax: 1, AutomataDifference: 1.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1597 SDtfs, 757 SDslu, 1105 SDs, 0 SdLazy, 113 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 463 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10000occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.4s AutomataMinimizationTime, 21 MinimizatonAttempts, 2064 StatesRemovedByMinimization, 20 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 522 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 484 NumberOfCodeBlocks, 356 NumberOfCodeBlocksAsserted, 59 NumberOfCheckSat, 463 ConstructedInterpolants, 0 QuantifiedInterpolants, 19678 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1951 ConjunctsInSsa, 63 ConjunctsInUnsatCore, 21 InterpolantComputations, 21 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...