/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_6.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:27,125 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:27,128 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:27,147 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:12:27,147 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:12:27,149 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:12:27,151 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:12:27,161 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:12:27,165 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:12:27,168 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:12:27,168 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:12:27,170 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:12:27,171 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:27,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:27,174 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:27,175 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:27,177 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:27,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:27,181 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:27,183 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:27,187 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:27,190 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:27,191 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:27,192 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:27,195 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:27,208 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:12:27,209 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:12:27,210 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:12:27,211 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:12:27,247 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:27,248 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:27,249 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:27,250 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:27,250 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:27,250 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:27,250 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:27,251 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:27,251 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:27,251 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:27,251 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:27,254 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:27,254 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:27,255 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:27,255 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:27,255 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:27,255 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:27,255 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:27,256 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:27,256 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:27,256 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:27,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:27,257 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:27,257 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:27,257 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:27,257 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:27,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,258 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:27,258 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:27,258 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:12:27,522 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:27,533 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:27,536 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:27,538 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:27,538 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:27,539 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_6.c [2020-07-20 17:12:27,599 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab9324ca/806feafe14894f3f9fb68da1e93a744e/FLAGb2ba504a8 [2020-07-20 17:12:28,022 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:28,023 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_6.c [2020-07-20 17:12:28,030 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab9324ca/806feafe14894f3f9fb68da1e93a744e/FLAGb2ba504a8 [2020-07-20 17:12:28,407 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab9324ca/806feafe14894f3f9fb68da1e93a744e [2020-07-20 17:12:28,418 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:28,422 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:28,423 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:28,423 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:28,427 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:28,428 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,431 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4712803d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28, skipping insertion in model container [2020-07-20 17:12:28,431 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:28,458 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:28,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:28,674 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:28,695 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:28,709 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:28,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28 WrapperNode [2020-07-20 17:12:28,709 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:28,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:28,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:28,710 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:28,800 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,802 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,807 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,807 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,811 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,817 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... [2020-07-20 17:12:28,820 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:28,821 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:28,821 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:28,821 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:28,822 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:28,881 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:28,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:28,882 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:28,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:28,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:28,882 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:28,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:28,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:29,125 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:29,126 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:29,130 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:29 BoogieIcfgContainer [2020-07-20 17:12:29,130 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:29,131 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:29,132 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:29,135 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:29,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:28" (1/3) ... [2020-07-20 17:12:29,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a79225c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:29, skipping insertion in model container [2020-07-20 17:12:29,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:28" (2/3) ... [2020-07-20 17:12:29,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a79225c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:29, skipping insertion in model container [2020-07-20 17:12:29,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:29" (3/3) ... [2020-07-20 17:12:29,138 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_6.c [2020-07-20 17:12:29,151 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:29,162 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:29,177 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:29,219 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:29,219 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:29,219 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:29,220 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:29,220 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:29,220 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:29,220 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:29,221 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:29,246 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-20 17:12:29,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:12:29,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,254 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,255 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,261 INFO L82 PathProgramCache]: Analyzing trace with hash 429652513, now seen corresponding path program 1 times [2020-07-20 17:12:29,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628024684] [2020-07-20 17:12:29,281 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,407 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628024684] [2020-07-20 17:12:29,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006590119] [2020-07-20 17:12:29,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,432 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2020-07-20 17:12:29,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,477 INFO L93 Difference]: Finished difference Result 63 states and 102 transitions. [2020-07-20 17:12:29,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,478 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 17:12:29,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,488 INFO L225 Difference]: With dead ends: 63 [2020-07-20 17:12:29,489 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 17:12:29,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 17:12:29,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2020-07-20 17:12:29,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 17:12:29,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 57 transitions. [2020-07-20 17:12:29,534 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 57 transitions. Word has length 16 [2020-07-20 17:12:29,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,534 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 57 transitions. [2020-07-20 17:12:29,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,535 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 57 transitions. [2020-07-20 17:12:29,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:12:29,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,536 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,751 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1109710883, now seen corresponding path program 1 times [2020-07-20 17:12:29,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320299585] [2020-07-20 17:12:29,755 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,801 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,829 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320299585] [2020-07-20 17:12:29,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711439144] [2020-07-20 17:12:29,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,834 INFO L87 Difference]: Start difference. First operand 34 states and 57 transitions. Second operand 3 states. [2020-07-20 17:12:29,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,860 INFO L93 Difference]: Finished difference Result 77 states and 132 transitions. [2020-07-20 17:12:29,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,861 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 17:12:29,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,863 INFO L225 Difference]: With dead ends: 77 [2020-07-20 17:12:29,863 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 17:12:29,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 17:12:29,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-07-20 17:12:29,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 17:12:29,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 77 transitions. [2020-07-20 17:12:29,874 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 77 transitions. Word has length 16 [2020-07-20 17:12:29,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,875 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 77 transitions. [2020-07-20 17:12:29,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,875 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 77 transitions. [2020-07-20 17:12:29,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:29,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,092 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,093 INFO L82 PathProgramCache]: Analyzing trace with hash 434540691, now seen corresponding path program 1 times [2020-07-20 17:12:30,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351175398] [2020-07-20 17:12:30,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:30,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:30,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351175398] [2020-07-20 17:12:30,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136492685] [2020-07-20 17:12:30,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,173 INFO L87 Difference]: Start difference. First operand 46 states and 77 transitions. Second operand 3 states. [2020-07-20 17:12:30,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,204 INFO L93 Difference]: Finished difference Result 72 states and 117 transitions. [2020-07-20 17:12:30,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,205 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:30,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,207 INFO L225 Difference]: With dead ends: 72 [2020-07-20 17:12:30,207 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 17:12:30,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 17:12:30,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-07-20 17:12:30,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 17:12:30,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 79 transitions. [2020-07-20 17:12:30,224 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 79 transitions. Word has length 17 [2020-07-20 17:12:30,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,224 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 79 transitions. [2020-07-20 17:12:30,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,226 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 79 transitions. [2020-07-20 17:12:30,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:30,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,228 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,445 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,446 INFO L82 PathProgramCache]: Analyzing trace with hash 41513681, now seen corresponding path program 1 times [2020-07-20 17:12:30,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005728580] [2020-07-20 17:12:30,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:30,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:30,510 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005728580] [2020-07-20 17:12:30,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6371369] [2020-07-20 17:12:30,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,515 INFO L87 Difference]: Start difference. First operand 49 states and 79 transitions. Second operand 3 states. [2020-07-20 17:12:30,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,546 INFO L93 Difference]: Finished difference Result 88 states and 144 transitions. [2020-07-20 17:12:30,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,548 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:30,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,550 INFO L225 Difference]: With dead ends: 88 [2020-07-20 17:12:30,550 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 17:12:30,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 17:12:30,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2020-07-20 17:12:30,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 17:12:30,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 104 transitions. [2020-07-20 17:12:30,571 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 104 transitions. Word has length 17 [2020-07-20 17:12:30,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,571 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 104 transitions. [2020-07-20 17:12:30,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,572 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 104 transitions. [2020-07-20 17:12:30,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:30,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,573 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,787 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,788 INFO L82 PathProgramCache]: Analyzing trace with hash 721572051, now seen corresponding path program 1 times [2020-07-20 17:12:30,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750436301] [2020-07-20 17:12:30,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,848 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:30,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:30,866 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750436301] [2020-07-20 17:12:30,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955953380] [2020-07-20 17:12:30,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,869 INFO L87 Difference]: Start difference. First operand 64 states and 104 transitions. Second operand 3 states. [2020-07-20 17:12:30,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,897 INFO L93 Difference]: Finished difference Result 144 states and 238 transitions. [2020-07-20 17:12:30,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,897 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:30,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,899 INFO L225 Difference]: With dead ends: 144 [2020-07-20 17:12:30,899 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 17:12:30,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 17:12:30,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-07-20 17:12:30,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 17:12:30,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 138 transitions. [2020-07-20 17:12:30,911 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 138 transitions. Word has length 17 [2020-07-20 17:12:30,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,911 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 138 transitions. [2020-07-20 17:12:30,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,912 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 138 transitions. [2020-07-20 17:12:30,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:30,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,913 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,129 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1287139128, now seen corresponding path program 1 times [2020-07-20 17:12:31,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867613688] [2020-07-20 17:12:31,132 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,188 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:31,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867613688] [2020-07-20 17:12:31,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297590476] [2020-07-20 17:12:31,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,200 INFO L87 Difference]: Start difference. First operand 86 states and 138 transitions. Second operand 3 states. [2020-07-20 17:12:31,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,219 INFO L93 Difference]: Finished difference Result 129 states and 205 transitions. [2020-07-20 17:12:31,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,220 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:31,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,221 INFO L225 Difference]: With dead ends: 129 [2020-07-20 17:12:31,222 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 17:12:31,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 17:12:31,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-07-20 17:12:31,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 17:12:31,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 138 transitions. [2020-07-20 17:12:31,231 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 138 transitions. Word has length 18 [2020-07-20 17:12:31,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,232 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 138 transitions. [2020-07-20 17:12:31,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,232 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 138 transitions. [2020-07-20 17:12:31,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:31,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,233 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,450 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,450 INFO L82 PathProgramCache]: Analyzing trace with hash 894112118, now seen corresponding path program 1 times [2020-07-20 17:12:31,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609913461] [2020-07-20 17:12:31,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,485 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609913461] [2020-07-20 17:12:31,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503936580] [2020-07-20 17:12:31,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,499 INFO L87 Difference]: Start difference. First operand 88 states and 138 transitions. Second operand 3 states. [2020-07-20 17:12:31,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,527 INFO L93 Difference]: Finished difference Result 156 states and 248 transitions. [2020-07-20 17:12:31,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,527 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:31,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,530 INFO L225 Difference]: With dead ends: 156 [2020-07-20 17:12:31,530 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 17:12:31,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 17:12:31,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 120. [2020-07-20 17:12:31,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 17:12:31,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 186 transitions. [2020-07-20 17:12:31,546 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 186 transitions. Word has length 18 [2020-07-20 17:12:31,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,546 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 186 transitions. [2020-07-20 17:12:31,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,546 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 186 transitions. [2020-07-20 17:12:31,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:31,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,754 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1574170488, now seen corresponding path program 1 times [2020-07-20 17:12:31,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767846535] [2020-07-20 17:12:31,757 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:31,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767846535] [2020-07-20 17:12:31,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784595148] [2020-07-20 17:12:31,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,800 INFO L87 Difference]: Start difference. First operand 120 states and 186 transitions. Second operand 3 states. [2020-07-20 17:12:31,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,823 INFO L93 Difference]: Finished difference Result 272 states and 424 transitions. [2020-07-20 17:12:31,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,824 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:31,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,825 INFO L225 Difference]: With dead ends: 272 [2020-07-20 17:12:31,825 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 17:12:31,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 17:12:31,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2020-07-20 17:12:31,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 17:12:31,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 242 transitions. [2020-07-20 17:12:31,839 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 242 transitions. Word has length 18 [2020-07-20 17:12:31,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,840 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 242 transitions. [2020-07-20 17:12:31,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,840 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 242 transitions. [2020-07-20 17:12:31,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:31,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,841 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 17:12:32,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,057 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1947887240, now seen corresponding path program 1 times [2020-07-20 17:12:32,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314661881] [2020-07-20 17:12:32,060 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,103 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314661881] [2020-07-20 17:12:32,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977542121] [2020-07-20 17:12:32,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,106 INFO L87 Difference]: Start difference. First operand 160 states and 242 transitions. Second operand 3 states. [2020-07-20 17:12:32,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,124 INFO L93 Difference]: Finished difference Result 240 states and 360 transitions. [2020-07-20 17:12:32,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,124 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,125 INFO L225 Difference]: With dead ends: 240 [2020-07-20 17:12:32,126 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 17:12:32,126 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 17:12:32,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 17:12:32,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2020-07-20 17:12:32,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-07-20 17:12:32,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 242 transitions. [2020-07-20 17:12:32,137 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 242 transitions. Word has length 19 [2020-07-20 17:12:32,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,137 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 242 transitions. [2020-07-20 17:12:32,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,137 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 242 transitions. [2020-07-20 17:12:32,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:32,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,139 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 17:12:32,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,353 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,354 INFO L82 PathProgramCache]: Analyzing trace with hash 1554860230, now seen corresponding path program 1 times [2020-07-20 17:12:32,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761964728] [2020-07-20 17:12:32,356 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761964728] [2020-07-20 17:12:32,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499998258] [2020-07-20 17:12:32,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,397 INFO L87 Difference]: Start difference. First operand 164 states and 242 transitions. Second operand 3 states. [2020-07-20 17:12:32,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,426 INFO L93 Difference]: Finished difference Result 284 states and 424 transitions. [2020-07-20 17:12:32,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,429 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,431 INFO L225 Difference]: With dead ends: 284 [2020-07-20 17:12:32,431 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 17:12:32,431 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 17:12:32,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 17:12:32,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 232. [2020-07-20 17:12:32,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 17:12:32,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 334 transitions. [2020-07-20 17:12:32,442 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 334 transitions. Word has length 19 [2020-07-20 17:12:32,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,443 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 334 transitions. [2020-07-20 17:12:32,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,443 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 334 transitions. [2020-07-20 17:12:32,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:32,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,445 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 17:12:32,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,658 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,659 INFO L82 PathProgramCache]: Analyzing trace with hash -2060048696, now seen corresponding path program 1 times [2020-07-20 17:12:32,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575007425] [2020-07-20 17:12:32,661 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,686 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:32,699 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575007425] [2020-07-20 17:12:32,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093331078] [2020-07-20 17:12:32,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,701 INFO L87 Difference]: Start difference. First operand 232 states and 334 transitions. Second operand 3 states. [2020-07-20 17:12:32,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,732 INFO L93 Difference]: Finished difference Result 524 states and 752 transitions. [2020-07-20 17:12:32,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,733 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:32,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,737 INFO L225 Difference]: With dead ends: 524 [2020-07-20 17:12:32,737 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 17:12:32,739 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 17:12:32,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 17:12:32,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 304. [2020-07-20 17:12:32,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 17:12:32,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 422 transitions. [2020-07-20 17:12:32,753 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 422 transitions. Word has length 19 [2020-07-20 17:12:32,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,754 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 422 transitions. [2020-07-20 17:12:32,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,754 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 422 transitions. [2020-07-20 17:12:32,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:32,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,756 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 17:12:32,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,970 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,971 INFO L82 PathProgramCache]: Analyzing trace with hash 956242573, now seen corresponding path program 1 times [2020-07-20 17:12:32,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016329827] [2020-07-20 17:12:32,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,027 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 17:12:33,028 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016329827] [2020-07-20 17:12:33,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135043905] [2020-07-20 17:12:33,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,032 INFO L87 Difference]: Start difference. First operand 304 states and 422 transitions. Second operand 3 states. [2020-07-20 17:12:33,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,050 INFO L93 Difference]: Finished difference Result 456 states and 628 transitions. [2020-07-20 17:12:33,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,050 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,054 INFO L225 Difference]: With dead ends: 456 [2020-07-20 17:12:33,054 INFO L226 Difference]: Without dead ends: 314 [2020-07-20 17:12:33,055 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 17:12:33,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-20 17:12:33,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 312. [2020-07-20 17:12:33,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-07-20 17:12:33,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 422 transitions. [2020-07-20 17:12:33,070 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 422 transitions. Word has length 20 [2020-07-20 17:12:33,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,071 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 422 transitions. [2020-07-20 17:12:33,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,072 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 422 transitions. [2020-07-20 17:12:33,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:33,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,073 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 17:12:33,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,288 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,289 INFO L82 PathProgramCache]: Analyzing trace with hash 563215563, now seen corresponding path program 1 times [2020-07-20 17:12:33,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595200547] [2020-07-20 17:12:33,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,329 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595200547] [2020-07-20 17:12:33,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757793472] [2020-07-20 17:12:33,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,331 INFO L87 Difference]: Start difference. First operand 312 states and 422 transitions. Second operand 3 states. [2020-07-20 17:12:33,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,355 INFO L93 Difference]: Finished difference Result 524 states and 712 transitions. [2020-07-20 17:12:33,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,356 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,359 INFO L225 Difference]: With dead ends: 524 [2020-07-20 17:12:33,359 INFO L226 Difference]: Without dead ends: 522 [2020-07-20 17:12:33,360 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 17:12:33,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-20 17:12:33,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 456. [2020-07-20 17:12:33,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-20 17:12:33,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 598 transitions. [2020-07-20 17:12:33,377 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 598 transitions. Word has length 20 [2020-07-20 17:12:33,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,378 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 598 transitions. [2020-07-20 17:12:33,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,378 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 598 transitions. [2020-07-20 17:12:33,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:33,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,380 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 17:12:33,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,593 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1243273933, now seen corresponding path program 1 times [2020-07-20 17:12:33,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91176635] [2020-07-20 17:12:33,595 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:33,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91176635] [2020-07-20 17:12:33,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42412304] [2020-07-20 17:12:33,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,641 INFO L87 Difference]: Start difference. First operand 456 states and 598 transitions. Second operand 3 states. [2020-07-20 17:12:33,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,682 INFO L93 Difference]: Finished difference Result 1020 states and 1320 transitions. [2020-07-20 17:12:33,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,683 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:33,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,686 INFO L225 Difference]: With dead ends: 1020 [2020-07-20 17:12:33,687 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 17:12:33,688 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 17:12:33,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 17:12:33,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-20 17:12:33,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-20 17:12:33,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 726 transitions. [2020-07-20 17:12:33,708 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 726 transitions. Word has length 20 [2020-07-20 17:12:33,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,708 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 726 transitions. [2020-07-20 17:12:33,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,708 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 726 transitions. [2020-07-20 17:12:33,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:33,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,710 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:33,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,924 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,925 INFO L82 PathProgramCache]: Analyzing trace with hash 280029309, now seen corresponding path program 1 times [2020-07-20 17:12:33,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789283226] [2020-07-20 17:12:33,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:33,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:33,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:33,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:33,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:33,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:33,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789283226] [2020-07-20 17:12:33,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:33,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:33,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443951034] [2020-07-20 17:12:33,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:33,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:33,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:33,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,966 INFO L87 Difference]: Start difference. First operand 584 states and 726 transitions. Second operand 3 states. [2020-07-20 17:12:33,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,987 INFO L93 Difference]: Finished difference Result 876 states and 1080 transitions. [2020-07-20 17:12:33,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,988 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:33,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,992 INFO L225 Difference]: With dead ends: 876 [2020-07-20 17:12:33,992 INFO L226 Difference]: Without dead ends: 602 [2020-07-20 17:12:33,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-07-20 17:12:34,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 600. [2020-07-20 17:12:34,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 600 states. [2020-07-20 17:12:34,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 726 transitions. [2020-07-20 17:12:34,017 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 726 transitions. Word has length 21 [2020-07-20 17:12:34,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,018 INFO L479 AbstractCegarLoop]: Abstraction has 600 states and 726 transitions. [2020-07-20 17:12:34,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,018 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 726 transitions. [2020-07-20 17:12:34,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:34,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:34,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,235 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,235 INFO L82 PathProgramCache]: Analyzing trace with hash -112997701, now seen corresponding path program 1 times [2020-07-20 17:12:34,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547961077] [2020-07-20 17:12:34,236 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,276 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547961077] [2020-07-20 17:12:34,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006177569] [2020-07-20 17:12:34,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,278 INFO L87 Difference]: Start difference. First operand 600 states and 726 transitions. Second operand 3 states. [2020-07-20 17:12:34,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,319 INFO L93 Difference]: Finished difference Result 970 states and 1159 transitions. [2020-07-20 17:12:34,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,319 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:34,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,324 INFO L225 Difference]: With dead ends: 970 [2020-07-20 17:12:34,324 INFO L226 Difference]: Without dead ends: 968 [2020-07-20 17:12:34,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 968 states. [2020-07-20 17:12:34,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 968 to 904. [2020-07-20 17:12:34,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 904 states. [2020-07-20 17:12:34,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1062 transitions. [2020-07-20 17:12:34,354 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1062 transitions. Word has length 21 [2020-07-20 17:12:34,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,354 INFO L479 AbstractCegarLoop]: Abstraction has 904 states and 1062 transitions. [2020-07-20 17:12:34,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,354 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1062 transitions. [2020-07-20 17:12:34,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:34,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:34,356 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:34,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,571 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:34,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:34,572 INFO L82 PathProgramCache]: Analyzing trace with hash 567060669, now seen corresponding path program 1 times [2020-07-20 17:12:34,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:34,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119467060] [2020-07-20 17:12:34,573 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:34,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119467060] [2020-07-20 17:12:34,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204546951] [2020-07-20 17:12:34,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,625 INFO L87 Difference]: Start difference. First operand 904 states and 1062 transitions. Second operand 3 states. [2020-07-20 17:12:34,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,670 INFO L93 Difference]: Finished difference Result 1992 states and 2278 transitions. [2020-07-20 17:12:34,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,671 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:34,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,672 INFO L225 Difference]: With dead ends: 1992 [2020-07-20 17:12:34,672 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:34,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:34,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:34,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:34,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:34,678 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2020-07-20 17:12:34,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:34,679 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:34,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:34,679 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:34,679 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:34,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,898 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:34,960 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:34,960 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:34,961 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:34,961 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:34,961 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:34,961 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:34,961 INFO L268 CegarLoopResult]: For program point L93(line 93) no Hoare annotation was computed. [2020-07-20 17:12:34,961 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 107) no Hoare annotation was computed. [2020-07-20 17:12:34,961 INFO L268 CegarLoopResult]: For program point L77-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L78(line 78) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L271 CegarLoopResult]: At program point L103(lines 5 107) the Hoare annotation is: true [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L62-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L87-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L54-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,962 INFO L268 CegarLoopResult]: For program point L46(lines 46 48) no Hoare annotation was computed. [2020-07-20 17:12:34,963 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 107) no Hoare annotation was computed. [2020-07-20 17:12:34,963 INFO L268 CegarLoopResult]: For program point L46-2(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,963 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 105) no Hoare annotation was computed. [2020-07-20 17:12:34,963 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 107) the Hoare annotation is: true [2020-07-20 17:12:34,963 INFO L268 CegarLoopResult]: For program point L88(line 88) no Hoare annotation was computed. [2020-07-20 17:12:34,963 INFO L268 CegarLoopResult]: For program point L72-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,964 INFO L271 CegarLoopResult]: At program point L97-1(lines 27 102) the Hoare annotation is: true [2020-07-20 17:12:34,964 INFO L268 CegarLoopResult]: For program point L73(line 73) no Hoare annotation was computed. [2020-07-20 17:12:34,964 INFO L268 CegarLoopResult]: For program point L98(line 98) no Hoare annotation was computed. [2020-07-20 17:12:34,964 INFO L264 CegarLoopResult]: At program point L98-1(lines 5 107) the Hoare annotation is: false [2020-07-20 17:12:34,964 INFO L268 CegarLoopResult]: For program point L82-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,964 INFO L268 CegarLoopResult]: For program point L66-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,964 INFO L268 CegarLoopResult]: For program point L58-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,965 INFO L268 CegarLoopResult]: For program point L83(line 83) no Hoare annotation was computed. [2020-07-20 17:12:34,965 INFO L268 CegarLoopResult]: For program point L50-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,965 INFO L268 CegarLoopResult]: For program point L92-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 17:12:34,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:34 BoogieIcfgContainer [2020-07-20 17:12:34,977 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:34,979 INFO L168 Benchmark]: Toolchain (without parser) took 6558.86 ms. Allocated memory was 138.4 MB in the beginning and 246.4 MB in the end (delta: 108.0 MB). Free memory was 102.3 MB in the beginning and 142.7 MB in the end (delta: -40.3 MB). Peak memory consumption was 67.7 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,980 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.4 MB. Free memory was 120.3 MB in the beginning and 120.0 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,981 INFO L168 Benchmark]: CACSL2BoogieTranslator took 286.76 ms. Allocated memory is still 138.4 MB. Free memory was 101.9 MB in the beginning and 91.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,981 INFO L168 Benchmark]: Boogie Preprocessor took 110.25 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 180.6 MB in the end (delta: -88.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,982 INFO L168 Benchmark]: RCFGBuilder took 309.25 ms. Allocated memory is still 202.4 MB. Free memory was 180.6 MB in the beginning and 164.9 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,983 INFO L168 Benchmark]: TraceAbstraction took 5845.45 ms. Allocated memory was 202.4 MB in the beginning and 246.4 MB in the end (delta: 44.0 MB). Free memory was 164.2 MB in the beginning and 142.7 MB in the end (delta: 21.5 MB). Peak memory consumption was 65.6 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:34,985 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.4 MB. Free memory was 120.3 MB in the beginning and 120.0 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 286.76 ms. Allocated memory is still 138.4 MB. Free memory was 101.9 MB in the beginning and 91.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.25 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.8 MB in the beginning and 180.6 MB in the end (delta: -88.8 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 309.25 ms. Allocated memory is still 202.4 MB. Free memory was 180.6 MB in the beginning and 164.9 MB in the end (delta: 15.7 MB). Peak memory consumption was 15.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5845.45 ms. Allocated memory was 202.4 MB in the beginning and 246.4 MB in the end (delta: 44.0 MB). Free memory was 164.2 MB in the beginning and 142.7 MB in the end (delta: 21.5 MB). Peak memory consumption was 65.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 105]: 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: 27]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5.6s, OverallIterations: 17, TraceHistogramMax: 1, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 923 SDtfs, 417 SDslu, 612 SDs, 0 SdLazy, 91 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 300 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=904occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 17 MinimizatonAttempts, 270 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 74 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 317 NumberOfCodeBlocks, 307 NumberOfCodeBlocksAsserted, 64 NumberOfCheckSat, 300 ConstructedInterpolants, 0 QuantifiedInterpolants, 9690 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1258 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 17 InterpolantComputations, 17 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...