/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:35:06,227 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:35:06,230 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:35:06,250 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:35:06,251 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:35:06,252 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:35:06,253 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:35:06,255 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:35:06,257 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:35:06,258 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:35:06,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:35:06,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:35:06,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:35:06,261 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:35:06,262 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:35:06,263 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:35:06,264 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:35:06,265 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:35:06,267 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:35:06,269 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:35:06,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:35:06,271 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:35:06,272 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:35:06,273 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:35:06,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:35:06,283 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:35:06,284 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:35:06,285 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:35:06,286 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:35:06,301 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:35:06,302 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:35:06,303 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:35:06,303 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:35:06,303 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:35:06,304 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:35:06,304 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:35:06,304 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:35:06,304 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:35:06,304 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:35:06,305 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:35:06,305 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:35:06,305 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:35:06,305 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:35:06,305 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:35:06,306 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:35:06,306 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:35:06,306 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:35:06,306 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:35:06,306 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:35:06,307 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:35:06,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:06,307 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:35:06,307 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:35:06,307 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:35:06,308 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:35:06,308 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:06,308 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:35:06,308 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:35:06,308 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:35:06,615 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:35:06,630 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:35:06,633 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:35:06,635 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:35:06,638 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:35:06,638 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 13:35:06,731 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ccb4cf55/df4f56fcbb4d4569b2bc82c1b33cb875/FLAG3fe1cb840 [2020-07-21 13:35:07,273 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:35:07,274 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 13:35:07,291 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ccb4cf55/df4f56fcbb4d4569b2bc82c1b33cb875/FLAG3fe1cb840 [2020-07-21 13:35:07,598 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ccb4cf55/df4f56fcbb4d4569b2bc82c1b33cb875 [2020-07-21 13:35:07,611 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:35:07,614 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:35:07,615 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:07,615 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:35:07,619 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:35:07,620 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:07,623 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43ad6925 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07, skipping insertion in model container [2020-07-21 13:35:07,623 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:07,631 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:35:07,655 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:35:07,860 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:07,866 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:35:07,892 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:07,908 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:35:07,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07 WrapperNode [2020-07-21 13:35:07,909 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:07,910 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:35:07,910 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:35:07,910 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:35:08,019 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,030 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,030 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,044 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,046 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... [2020-07-21 13:35:08,048 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:35:08,049 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:35:08,049 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:35:08,050 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:35:08,051 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:08,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:35:08,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:35:08,116 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:35:08,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:35:08,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:35:08,116 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:35:08,116 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:35:08,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:35:08,423 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:35:08,423 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 13:35:08,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:08 BoogieIcfgContainer [2020-07-21 13:35:08,430 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:35:08,432 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:35:08,433 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:35:08,438 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:35:08,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:35:07" (1/3) ... [2020-07-21 13:35:08,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18a6a2f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:08, skipping insertion in model container [2020-07-21 13:35:08,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:07" (2/3) ... [2020-07-21 13:35:08,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18a6a2f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:08, skipping insertion in model container [2020-07-21 13:35:08,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:08" (3/3) ... [2020-07-21 13:35:08,443 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-21 13:35:08,455 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:35:08,465 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:35:08,498 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:35:08,553 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:35:08,554 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:35:08,554 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:35:08,554 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:35:08,554 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:35:08,555 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:35:08,555 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:35:08,555 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:35:08,577 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-21 13:35:08,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:08,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:08,586 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:08,586 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:08,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:08,592 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-21 13:35:08,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:08,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703823452] [2020-07-21 13:35:08,600 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:08,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:08,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:08,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:08,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:08,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:08,755 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:08,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703823452] [2020-07-21 13:35:08,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:08,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:08,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204307056] [2020-07-21 13:35:08,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:08,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:08,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:08,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:08,784 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-21 13:35:08,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:08,864 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-21 13:35:08,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:08,867 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:08,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:08,881 INFO L225 Difference]: With dead ends: 87 [2020-07-21 13:35:08,881 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:35:08,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:08,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:35:08,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 13:35:08,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:35:08,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-21 13:35:08,938 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-21 13:35:08,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:08,939 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-21 13:35:08,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:08,939 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-21 13:35:08,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:08,944 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:08,944 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:09,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,146 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:09,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:09,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-21 13:35:09,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:09,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267387166] [2020-07-21 13:35:09,149 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:09,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:09,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:09,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:09,242 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:09,242 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:09,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267387166] [2020-07-21 13:35:09,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:09,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:09,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933759300] [2020-07-21 13:35:09,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:09,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:09,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:09,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,247 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-21 13:35:09,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:09,279 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-21 13:35:09,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:09,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:09,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:09,282 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:35:09,282 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:35:09,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:35:09,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-21 13:35:09,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:35:09,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-21 13:35:09,297 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-21 13:35:09,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:09,297 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-21 13:35:09,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:09,297 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-21 13:35:09,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:09,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:09,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:09,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,515 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:09,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:09,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-21 13:35:09,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:09,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450197973] [2020-07-21 13:35:09,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:09,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:09,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:09,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:09,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:09,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450197973] [2020-07-21 13:35:09,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:09,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:09,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135076939] [2020-07-21 13:35:09,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:09,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:09,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:09,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,593 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-21 13:35:09,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:09,623 INFO L93 Difference]: Finished difference Result 108 states and 189 transitions. [2020-07-21 13:35:09,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:09,624 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:09,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:09,626 INFO L225 Difference]: With dead ends: 108 [2020-07-21 13:35:09,626 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 13:35:09,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 13:35:09,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-07-21 13:35:09,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 13:35:09,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions. [2020-07-21 13:35:09,639 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21 [2020-07-21 13:35:09,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:09,640 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 127 transitions. [2020-07-21 13:35:09,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:09,640 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions. [2020-07-21 13:35:09,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:09,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:09,642 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:09,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,856 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:09,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:09,857 INFO L82 PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times [2020-07-21 13:35:09,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:09,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270400837] [2020-07-21 13:35:09,858 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:09,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:09,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:09,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:09,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:09,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:09,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:09,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270400837] [2020-07-21 13:35:09,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:09,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:09,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654560594] [2020-07-21 13:35:09,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:09,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:09,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:09,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,933 INFO L87 Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states. [2020-07-21 13:35:09,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:09,963 INFO L93 Difference]: Finished difference Result 136 states and 240 transitions. [2020-07-21 13:35:09,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:09,964 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:09,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:09,966 INFO L225 Difference]: With dead ends: 136 [2020-07-21 13:35:09,966 INFO L226 Difference]: Without dead ends: 134 [2020-07-21 13:35:09,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:09,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-21 13:35:09,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96. [2020-07-21 13:35:09,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 13:35:09,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions. [2020-07-21 13:35:09,981 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21 [2020-07-21 13:35:09,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:09,981 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 168 transitions. [2020-07-21 13:35:09,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:09,982 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions. [2020-07-21 13:35:09,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:09,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:09,983 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:10,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,200 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:10,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:10,201 INFO L82 PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times [2020-07-21 13:35:10,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:10,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649311450] [2020-07-21 13:35:10,203 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:10,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:10,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:10,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:10,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:10,301 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:10,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649311450] [2020-07-21 13:35:10,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:10,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:10,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099393854] [2020-07-21 13:35:10,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:10,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:10,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:10,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,304 INFO L87 Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states. [2020-07-21 13:35:10,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:10,322 INFO L93 Difference]: Finished difference Result 224 states and 398 transitions. [2020-07-21 13:35:10,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:10,323 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:10,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:10,326 INFO L225 Difference]: With dead ends: 224 [2020-07-21 13:35:10,326 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 13:35:10,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 13:35:10,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2020-07-21 13:35:10,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 13:35:10,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions. [2020-07-21 13:35:10,341 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21 [2020-07-21 13:35:10,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:10,342 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 234 transitions. [2020-07-21 13:35:10,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:10,342 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions. [2020-07-21 13:35:10,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:10,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:10,343 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:10,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,557 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:10,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:10,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times [2020-07-21 13:35:10,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:10,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863957972] [2020-07-21 13:35:10,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:10,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:10,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:10,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:10,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:10,625 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:10,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863957972] [2020-07-21 13:35:10,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:10,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:10,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970491528] [2020-07-21 13:35:10,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:10,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:10,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:10,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,628 INFO L87 Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states. [2020-07-21 13:35:10,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:10,654 INFO L93 Difference]: Finished difference Result 201 states and 349 transitions. [2020-07-21 13:35:10,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:10,654 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:10,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:10,656 INFO L225 Difference]: With dead ends: 201 [2020-07-21 13:35:10,656 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 13:35:10,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 13:35:10,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 13:35:10,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 13:35:10,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions. [2020-07-21 13:35:10,671 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22 [2020-07-21 13:35:10,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:10,671 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 234 transitions. [2020-07-21 13:35:10,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:10,671 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions. [2020-07-21 13:35:10,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:10,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:10,673 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:10,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,888 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:10,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:10,889 INFO L82 PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times [2020-07-21 13:35:10,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:10,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47518015] [2020-07-21 13:35:10,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:10,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:10,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:10,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:10,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:10,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:10,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:10,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47518015] [2020-07-21 13:35:10,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:10,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:10,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364664919] [2020-07-21 13:35:10,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:10,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:10,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:10,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,943 INFO L87 Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states. [2020-07-21 13:35:10,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:10,972 INFO L93 Difference]: Finished difference Result 252 states and 440 transitions. [2020-07-21 13:35:10,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:10,974 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:10,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:10,976 INFO L225 Difference]: With dead ends: 252 [2020-07-21 13:35:10,976 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 13:35:10,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:10,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 13:35:11,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184. [2020-07-21 13:35:11,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 13:35:11,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions. [2020-07-21 13:35:11,005 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22 [2020-07-21 13:35:11,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:11,006 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 314 transitions. [2020-07-21 13:35:11,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:11,006 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions. [2020-07-21 13:35:11,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:35:11,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:11,008 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:11,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,224 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:11,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:11,225 INFO L82 PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times [2020-07-21 13:35:11,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:11,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122695804] [2020-07-21 13:35:11,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:11,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:11,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:11,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:11,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:11,284 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:11,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122695804] [2020-07-21 13:35:11,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:11,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:11,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925118188] [2020-07-21 13:35:11,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:11,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:11,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:11,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,286 INFO L87 Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states. [2020-07-21 13:35:11,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:11,311 INFO L93 Difference]: Finished difference Result 432 states and 744 transitions. [2020-07-21 13:35:11,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:11,312 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:35:11,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:11,314 INFO L225 Difference]: With dead ends: 432 [2020-07-21 13:35:11,314 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 13:35:11,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 13:35:11,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 13:35:11,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 13:35:11,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions. [2020-07-21 13:35:11,330 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22 [2020-07-21 13:35:11,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:11,331 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 434 transitions. [2020-07-21 13:35:11,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:11,331 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions. [2020-07-21 13:35:11,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:11,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:11,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:11,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,549 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:11,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:11,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times [2020-07-21 13:35:11,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:11,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363279348] [2020-07-21 13:35:11,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:11,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:11,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:11,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:11,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:11,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:11,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363279348] [2020-07-21 13:35:11,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:11,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:11,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140532151] [2020-07-21 13:35:11,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:11,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:11,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:11,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,603 INFO L87 Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states. [2020-07-21 13:35:11,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:11,636 INFO L93 Difference]: Finished difference Result 472 states and 812 transitions. [2020-07-21 13:35:11,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:11,636 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:11,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:11,639 INFO L225 Difference]: With dead ends: 472 [2020-07-21 13:35:11,640 INFO L226 Difference]: Without dead ends: 470 [2020-07-21 13:35:11,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-21 13:35:11,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 356. [2020-07-21 13:35:11,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 356 states. [2020-07-21 13:35:11,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 594 transitions. [2020-07-21 13:35:11,657 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 594 transitions. Word has length 23 [2020-07-21 13:35:11,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:11,657 INFO L479 AbstractCegarLoop]: Abstraction has 356 states and 594 transitions. [2020-07-21 13:35:11,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:11,657 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 594 transitions. [2020-07-21 13:35:11,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:11,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:11,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:11,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,873 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:11,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:11,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1809975368, now seen corresponding path program 1 times [2020-07-21 13:35:11,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:11,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119559919] [2020-07-21 13:35:11,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:11,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:11,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:11,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:11,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:11,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:11,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:11,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119559919] [2020-07-21 13:35:11,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:11,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:11,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121985780] [2020-07-21 13:35:11,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:11,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:11,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:11,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,943 INFO L87 Difference]: Start difference. First operand 356 states and 594 transitions. Second operand 3 states. [2020-07-21 13:35:11,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:11,970 INFO L93 Difference]: Finished difference Result 532 states and 884 transitions. [2020-07-21 13:35:11,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:11,971 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:11,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:11,974 INFO L225 Difference]: With dead ends: 532 [2020-07-21 13:35:11,974 INFO L226 Difference]: Without dead ends: 362 [2020-07-21 13:35:11,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:11,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-21 13:35:11,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 360. [2020-07-21 13:35:11,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 13:35:11,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions. [2020-07-21 13:35:11,992 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23 [2020-07-21 13:35:11,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:11,993 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 590 transitions. [2020-07-21 13:35:11,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:11,993 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions. [2020-07-21 13:35:11,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:35:11,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:11,995 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:12,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,211 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:12,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:12,212 INFO L82 PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times [2020-07-21 13:35:12,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:12,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216456879] [2020-07-21 13:35:12,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:12,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:12,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:12,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:12,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:12,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:12,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216456879] [2020-07-21 13:35:12,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:12,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:12,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903791987] [2020-07-21 13:35:12,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:12,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:12,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:12,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:12,274 INFO L87 Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states. [2020-07-21 13:35:12,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:12,306 INFO L93 Difference]: Finished difference Result 844 states and 1392 transitions. [2020-07-21 13:35:12,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:12,307 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:35:12,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:12,310 INFO L225 Difference]: With dead ends: 844 [2020-07-21 13:35:12,311 INFO L226 Difference]: Without dead ends: 498 [2020-07-21 13:35:12,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:12,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2020-07-21 13:35:12,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496. [2020-07-21 13:35:12,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-21 13:35:12,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions. [2020-07-21 13:35:12,333 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23 [2020-07-21 13:35:12,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:12,334 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 806 transitions. [2020-07-21 13:35:12,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:12,334 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions. [2020-07-21 13:35:12,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:12,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:12,336 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:12,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,553 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:12,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:12,554 INFO L82 PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times [2020-07-21 13:35:12,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:12,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481616329] [2020-07-21 13:35:12,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:12,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:12,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:12,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:12,628 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:12,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:12,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481616329] [2020-07-21 13:35:12,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:12,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:12,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231110302] [2020-07-21 13:35:12,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:12,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:12,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:12,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:12,635 INFO L87 Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states. [2020-07-21 13:35:12,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:12,680 INFO L93 Difference]: Finished difference Result 900 states and 1488 transitions. [2020-07-21 13:35:12,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:12,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:12,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:12,687 INFO L225 Difference]: With dead ends: 900 [2020-07-21 13:35:12,687 INFO L226 Difference]: Without dead ends: 898 [2020-07-21 13:35:12,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:12,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2020-07-21 13:35:12,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 704. [2020-07-21 13:35:12,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 704 states. [2020-07-21 13:35:12,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 704 states to 704 states and 1118 transitions. [2020-07-21 13:35:12,718 INFO L78 Accepts]: Start accepts. Automaton has 704 states and 1118 transitions. Word has length 24 [2020-07-21 13:35:12,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:12,718 INFO L479 AbstractCegarLoop]: Abstraction has 704 states and 1118 transitions. [2020-07-21 13:35:12,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:12,718 INFO L276 IsEmpty]: Start isEmpty. Operand 704 states and 1118 transitions. [2020-07-21 13:35:12,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:12,720 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:12,720 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:12,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,934 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:12,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:12,935 INFO L82 PathProgramCache]: Analyzing trace with hash -580676479, now seen corresponding path program 1 times [2020-07-21 13:35:12,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:12,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288752922] [2020-07-21 13:35:12,937 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:12,973 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:12,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:12,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:12,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:12,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:12,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:12,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288752922] [2020-07-21 13:35:12,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:12,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:12,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133192654] [2020-07-21 13:35:12,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:12,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:12,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:12,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:12,995 INFO L87 Difference]: Start difference. First operand 704 states and 1118 transitions. Second operand 3 states. [2020-07-21 13:35:13,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:13,026 INFO L93 Difference]: Finished difference Result 1052 states and 1664 transitions. [2020-07-21 13:35:13,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:13,027 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:13,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:13,032 INFO L225 Difference]: With dead ends: 1052 [2020-07-21 13:35:13,033 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 13:35:13,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:13,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 13:35:13,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 712. [2020-07-21 13:35:13,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 712 states. [2020-07-21 13:35:13,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 1110 transitions. [2020-07-21 13:35:13,062 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 1110 transitions. Word has length 24 [2020-07-21 13:35:13,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:13,063 INFO L479 AbstractCegarLoop]: Abstraction has 712 states and 1110 transitions. [2020-07-21 13:35:13,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:13,063 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 1110 transitions. [2020-07-21 13:35:13,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:35:13,065 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:13,065 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:13,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:13,281 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:13,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:13,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1591793729, now seen corresponding path program 1 times [2020-07-21 13:35:13,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:13,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005111036] [2020-07-21 13:35:13,283 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:13,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:13,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:13,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:13,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:13,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:13,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:13,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005111036] [2020-07-21 13:35:13,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:13,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:13,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214347941] [2020-07-21 13:35:13,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:13,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:13,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:13,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:13,337 INFO L87 Difference]: Start difference. First operand 712 states and 1110 transitions. Second operand 3 states. [2020-07-21 13:35:13,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:13,373 INFO L93 Difference]: Finished difference Result 1660 states and 2600 transitions. [2020-07-21 13:35:13,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:13,374 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:35:13,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:13,380 INFO L225 Difference]: With dead ends: 1660 [2020-07-21 13:35:13,380 INFO L226 Difference]: Without dead ends: 970 [2020-07-21 13:35:13,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:13,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-07-21 13:35:13,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 968. [2020-07-21 13:35:13,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 968 states. [2020-07-21 13:35:13,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 968 states to 968 states and 1494 transitions. [2020-07-21 13:35:13,420 INFO L78 Accepts]: Start accepts. Automaton has 968 states and 1494 transitions. Word has length 24 [2020-07-21 13:35:13,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:13,421 INFO L479 AbstractCegarLoop]: Abstraction has 968 states and 1494 transitions. [2020-07-21 13:35:13,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:13,421 INFO L276 IsEmpty]: Start isEmpty. Operand 968 states and 1494 transitions. [2020-07-21 13:35:13,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:13,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:13,424 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:13,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:13,638 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:13,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:13,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1089633349, now seen corresponding path program 1 times [2020-07-21 13:35:13,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:13,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240454676] [2020-07-21 13:35:13,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:13,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:13,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:13,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:13,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:13,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:13,685 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:13,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240454676] [2020-07-21 13:35:13,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:13,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:13,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835734123] [2020-07-21 13:35:13,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:13,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:13,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:13,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:13,688 INFO L87 Difference]: Start difference. First operand 968 states and 1494 transitions. Second operand 3 states. [2020-07-21 13:35:13,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:13,737 INFO L93 Difference]: Finished difference Result 1724 states and 2712 transitions. [2020-07-21 13:35:13,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:13,738 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:13,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:13,747 INFO L225 Difference]: With dead ends: 1724 [2020-07-21 13:35:13,747 INFO L226 Difference]: Without dead ends: 1722 [2020-07-21 13:35:13,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:13,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1722 states. [2020-07-21 13:35:13,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1722 to 1400. [2020-07-21 13:35:13,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1400 states. [2020-07-21 13:35:13,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1400 states to 1400 states and 2102 transitions. [2020-07-21 13:35:13,803 INFO L78 Accepts]: Start accepts. Automaton has 1400 states and 2102 transitions. Word has length 25 [2020-07-21 13:35:13,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:13,805 INFO L479 AbstractCegarLoop]: Abstraction has 1400 states and 2102 transitions. [2020-07-21 13:35:13,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:13,805 INFO L276 IsEmpty]: Start isEmpty. Operand 1400 states and 2102 transitions. [2020-07-21 13:35:13,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:13,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:13,809 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:14,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:14,025 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:14,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:14,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1676439363, now seen corresponding path program 1 times [2020-07-21 13:35:14,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:14,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927605748] [2020-07-21 13:35:14,027 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:14,091 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:14,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:14,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:14,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:14,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:14,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:14,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927605748] [2020-07-21 13:35:14,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:14,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:14,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301273509] [2020-07-21 13:35:14,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:14,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:14,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:14,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:14,122 INFO L87 Difference]: Start difference. First operand 1400 states and 2102 transitions. Second operand 3 states. [2020-07-21 13:35:14,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:14,160 INFO L93 Difference]: Finished difference Result 2092 states and 3128 transitions. [2020-07-21 13:35:14,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:14,161 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:14,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:14,170 INFO L225 Difference]: With dead ends: 2092 [2020-07-21 13:35:14,170 INFO L226 Difference]: Without dead ends: 1418 [2020-07-21 13:35:14,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:14,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1418 states. [2020-07-21 13:35:14,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1418 to 1416. [2020-07-21 13:35:14,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1416 states. [2020-07-21 13:35:14,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1416 states to 1416 states and 2086 transitions. [2020-07-21 13:35:14,227 INFO L78 Accepts]: Start accepts. Automaton has 1416 states and 2086 transitions. Word has length 25 [2020-07-21 13:35:14,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:14,227 INFO L479 AbstractCegarLoop]: Abstraction has 1416 states and 2086 transitions. [2020-07-21 13:35:14,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:14,228 INFO L276 IsEmpty]: Start isEmpty. Operand 1416 states and 2086 transitions. [2020-07-21 13:35:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:35:14,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:14,232 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:14,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:14,446 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:14,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:14,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1607410683, now seen corresponding path program 1 times [2020-07-21 13:35:14,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:14,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822106050] [2020-07-21 13:35:14,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:14,520 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:14,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:14,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:14,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:14,541 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:14,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822106050] [2020-07-21 13:35:14,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:14,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:14,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235228524] [2020-07-21 13:35:14,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:14,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:14,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:14,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:14,583 INFO L87 Difference]: Start difference. First operand 1416 states and 2086 transitions. Second operand 3 states. [2020-07-21 13:35:14,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:14,645 INFO L93 Difference]: Finished difference Result 3276 states and 4840 transitions. [2020-07-21 13:35:14,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:14,646 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:35:14,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:14,660 INFO L225 Difference]: With dead ends: 3276 [2020-07-21 13:35:14,660 INFO L226 Difference]: Without dead ends: 1898 [2020-07-21 13:35:14,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:14,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2020-07-21 13:35:14,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1896. [2020-07-21 13:35:14,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1896 states. [2020-07-21 13:35:14,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2758 transitions. [2020-07-21 13:35:14,754 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2758 transitions. Word has length 25 [2020-07-21 13:35:14,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:14,754 INFO L479 AbstractCegarLoop]: Abstraction has 1896 states and 2758 transitions. [2020-07-21 13:35:14,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:14,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2758 transitions. [2020-07-21 13:35:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:14,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:14,760 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:14,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:14,975 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:14,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:14,976 INFO L82 PathProgramCache]: Analyzing trace with hash -698544044, now seen corresponding path program 1 times [2020-07-21 13:35:14,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:14,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353561342] [2020-07-21 13:35:14,977 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:15,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:15,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:15,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:15,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:15,040 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:15,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353561342] [2020-07-21 13:35:15,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:15,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:15,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040499433] [2020-07-21 13:35:15,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:15,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:15,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:15,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:15,047 INFO L87 Difference]: Start difference. First operand 1896 states and 2758 transitions. Second operand 3 states. [2020-07-21 13:35:15,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:15,117 INFO L93 Difference]: Finished difference Result 3308 states and 4904 transitions. [2020-07-21 13:35:15,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:15,118 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:15,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:15,137 INFO L225 Difference]: With dead ends: 3308 [2020-07-21 13:35:15,138 INFO L226 Difference]: Without dead ends: 3306 [2020-07-21 13:35:15,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:15,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3306 states. [2020-07-21 13:35:15,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3306 to 2792. [2020-07-21 13:35:15,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2792 states. [2020-07-21 13:35:15,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2792 states to 2792 states and 3942 transitions. [2020-07-21 13:35:15,239 INFO L78 Accepts]: Start accepts. Automaton has 2792 states and 3942 transitions. Word has length 26 [2020-07-21 13:35:15,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:15,239 INFO L479 AbstractCegarLoop]: Abstraction has 2792 states and 3942 transitions. [2020-07-21 13:35:15,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:15,239 INFO L276 IsEmpty]: Start isEmpty. Operand 2792 states and 3942 transitions. [2020-07-21 13:35:15,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:15,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:15,245 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:15,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:15,459 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:15,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:15,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1285350058, now seen corresponding path program 1 times [2020-07-21 13:35:15,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:15,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32129927] [2020-07-21 13:35:15,460 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:15,498 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:15,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:15,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:15,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:15,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:15,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:15,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32129927] [2020-07-21 13:35:15,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:15,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:15,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642348004] [2020-07-21 13:35:15,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:15,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:15,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:15,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:15,519 INFO L87 Difference]: Start difference. First operand 2792 states and 3942 transitions. Second operand 3 states. [2020-07-21 13:35:15,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:15,580 INFO L93 Difference]: Finished difference Result 4172 states and 5864 transitions. [2020-07-21 13:35:15,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:15,581 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:15,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:15,598 INFO L225 Difference]: With dead ends: 4172 [2020-07-21 13:35:15,598 INFO L226 Difference]: Without dead ends: 2826 [2020-07-21 13:35:15,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:15,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2826 states. [2020-07-21 13:35:15,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2826 to 2824. [2020-07-21 13:35:15,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2824 states. [2020-07-21 13:35:15,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2824 states to 2824 states and 3910 transitions. [2020-07-21 13:35:15,690 INFO L78 Accepts]: Start accepts. Automaton has 2824 states and 3910 transitions. Word has length 26 [2020-07-21 13:35:15,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:15,690 INFO L479 AbstractCegarLoop]: Abstraction has 2824 states and 3910 transitions. [2020-07-21 13:35:15,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:15,690 INFO L276 IsEmpty]: Start isEmpty. Operand 2824 states and 3910 transitions. [2020-07-21 13:35:15,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:35:15,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:15,696 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:15,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:15,912 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:15,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:15,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1998499988, now seen corresponding path program 1 times [2020-07-21 13:35:15,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:15,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582914989] [2020-07-21 13:35:15,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:15,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:15,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:15,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:15,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:15,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:15,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:15,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582914989] [2020-07-21 13:35:15,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:15,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:15,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139169121] [2020-07-21 13:35:15,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:15,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:15,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:15,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:15,988 INFO L87 Difference]: Start difference. First operand 2824 states and 3910 transitions. Second operand 3 states. [2020-07-21 13:35:16,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:16,074 INFO L93 Difference]: Finished difference Result 6476 states and 8968 transitions. [2020-07-21 13:35:16,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:16,075 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 13:35:16,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:16,096 INFO L225 Difference]: With dead ends: 6476 [2020-07-21 13:35:16,097 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 13:35:16,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:16,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 13:35:16,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2020-07-21 13:35:16,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3720 states. [2020-07-21 13:35:16,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions. [2020-07-21 13:35:16,214 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 26 [2020-07-21 13:35:16,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:16,215 INFO L479 AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions. [2020-07-21 13:35:16,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:16,215 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions. [2020-07-21 13:35:16,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:16,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:16,221 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:16,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:16,435 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:16,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:16,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times [2020-07-21 13:35:16,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:16,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492813902] [2020-07-21 13:35:16,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:16,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:16,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:16,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:16,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:16,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:16,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:16,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492813902] [2020-07-21 13:35:16,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:16,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:16,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343495081] [2020-07-21 13:35:16,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:16,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:16,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:16,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:16,493 INFO L87 Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states. [2020-07-21 13:35:16,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:16,566 INFO L93 Difference]: Finished difference Result 5580 states and 7560 transitions. [2020-07-21 13:35:16,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:16,567 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:16,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:16,590 INFO L225 Difference]: With dead ends: 5580 [2020-07-21 13:35:16,590 INFO L226 Difference]: Without dead ends: 3786 [2020-07-21 13:35:16,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:16,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2020-07-21 13:35:16,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 3784. [2020-07-21 13:35:16,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3784 states. [2020-07-21 13:35:16,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3784 states to 3784 states and 5062 transitions. [2020-07-21 13:35:16,749 INFO L78 Accepts]: Start accepts. Automaton has 3784 states and 5062 transitions. Word has length 27 [2020-07-21 13:35:16,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:16,750 INFO L479 AbstractCegarLoop]: Abstraction has 3784 states and 5062 transitions. [2020-07-21 13:35:16,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:16,750 INFO L276 IsEmpty]: Start isEmpty. Operand 3784 states and 5062 transitions. [2020-07-21 13:35:16,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:16,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:16,758 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:16,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:16,973 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:16,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:16,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1824172910, now seen corresponding path program 1 times [2020-07-21 13:35:16,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:16,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075495716] [2020-07-21 13:35:16,975 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,023 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:17,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:17,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:17,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:17,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:17,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075495716] [2020-07-21 13:35:17,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:17,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:17,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090405086] [2020-07-21 13:35:17,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:17,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:17,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:17,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,037 INFO L87 Difference]: Start difference. First operand 3784 states and 5062 transitions. Second operand 3 states. [2020-07-21 13:35:17,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:17,199 INFO L93 Difference]: Finished difference Result 10956 states and 14408 transitions. [2020-07-21 13:35:17,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:17,201 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:17,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:17,231 INFO L225 Difference]: With dead ends: 10956 [2020-07-21 13:35:17,231 INFO L226 Difference]: Without dead ends: 7306 [2020-07-21 13:35:17,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2020-07-21 13:35:17,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7304. [2020-07-21 13:35:17,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 13:35:17,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9350 transitions. [2020-07-21 13:35:17,429 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9350 transitions. Word has length 27 [2020-07-21 13:35:17,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:17,429 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9350 transitions. [2020-07-21 13:35:17,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:17,430 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9350 transitions. [2020-07-21 13:35:17,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:35:17,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:17,440 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:17,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,654 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:17,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:17,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1883988372, now seen corresponding path program 1 times [2020-07-21 13:35:17,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:17,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844305206] [2020-07-21 13:35:17,656 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:17,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:17,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:17,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:17,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:17,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:17,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:17,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844305206] [2020-07-21 13:35:17,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:17,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:17,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47778722] [2020-07-21 13:35:17,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:17,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:17,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:17,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,710 INFO L87 Difference]: Start difference. First operand 7304 states and 9350 transitions. Second operand 3 states. [2020-07-21 13:35:17,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:17,845 INFO L93 Difference]: Finished difference Result 8076 states and 10632 transitions. [2020-07-21 13:35:17,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:17,846 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 13:35:17,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:17,867 INFO L225 Difference]: With dead ends: 8076 [2020-07-21 13:35:17,867 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 13:35:17,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:17,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 13:35:18,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 7304. [2020-07-21 13:35:18,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 13:35:18,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9222 transitions. [2020-07-21 13:35:18,145 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9222 transitions. Word has length 27 [2020-07-21 13:35:18,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:18,145 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9222 transitions. [2020-07-21 13:35:18,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:18,145 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9222 transitions. [2020-07-21 13:35:18,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 13:35:18,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:18,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:18,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,372 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:18,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:18,372 INFO L82 PathProgramCache]: Analyzing trace with hash 715001129, now seen corresponding path program 1 times [2020-07-21 13:35:18,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:18,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118822155] [2020-07-21 13:35:18,373 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:18,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:18,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:18,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:18,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:18,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:18,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118822155] [2020-07-21 13:35:18,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:18,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:18,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950582647] [2020-07-21 13:35:18,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:18,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:18,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:18,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:18,422 INFO L87 Difference]: Start difference. First operand 7304 states and 9222 transitions. Second operand 3 states. [2020-07-21 13:35:18,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:18,589 INFO L93 Difference]: Finished difference Result 12172 states and 15496 transitions. [2020-07-21 13:35:18,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:18,590 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 13:35:18,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:18,617 INFO L225 Difference]: With dead ends: 12172 [2020-07-21 13:35:18,617 INFO L226 Difference]: Without dead ends: 12170 [2020-07-21 13:35:18,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:18,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12170 states. [2020-07-21 13:35:18,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12170 to 11144. [2020-07-21 13:35:18,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11144 states. [2020-07-21 13:35:18,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11144 states to 11144 states and 13702 transitions. [2020-07-21 13:35:18,866 INFO L78 Accepts]: Start accepts. Automaton has 11144 states and 13702 transitions. Word has length 28 [2020-07-21 13:35:18,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:18,866 INFO L479 AbstractCegarLoop]: Abstraction has 11144 states and 13702 transitions. [2020-07-21 13:35:18,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:18,867 INFO L276 IsEmpty]: Start isEmpty. Operand 11144 states and 13702 transitions. [2020-07-21 13:35:18,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 13:35:18,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:18,887 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:19,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,103 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:19,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:19,104 INFO L82 PathProgramCache]: Analyzing trace with hash 128195115, now seen corresponding path program 1 times [2020-07-21 13:35:19,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:19,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1336886213] [2020-07-21 13:35:19,104 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:19,139 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:19,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:19,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:19,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:19,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:19,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:19,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1336886213] [2020-07-21 13:35:19,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:19,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:19,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852089472] [2020-07-21 13:35:19,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:19,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:19,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:19,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:19,157 INFO L87 Difference]: Start difference. First operand 11144 states and 13702 transitions. Second operand 3 states. [2020-07-21 13:35:19,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:19,419 INFO L93 Difference]: Finished difference Result 25228 states and 30856 transitions. [2020-07-21 13:35:19,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:19,420 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 13:35:19,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:19,456 INFO L225 Difference]: With dead ends: 25228 [2020-07-21 13:35:19,457 INFO L226 Difference]: Without dead ends: 14218 [2020-07-21 13:35:19,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:19,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14218 states. [2020-07-21 13:35:19,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14218 to 14216. [2020-07-21 13:35:19,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14216 states. [2020-07-21 13:35:19,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14216 states to 14216 states and 16902 transitions. [2020-07-21 13:35:19,958 INFO L78 Accepts]: Start accepts. Automaton has 14216 states and 16902 transitions. Word has length 28 [2020-07-21 13:35:19,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:19,958 INFO L479 AbstractCegarLoop]: Abstraction has 14216 states and 16902 transitions. [2020-07-21 13:35:19,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:19,958 INFO L276 IsEmpty]: Start isEmpty. Operand 14216 states and 16902 transitions. [2020-07-21 13:35:19,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 13:35:19,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:19,979 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:20,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:20,194 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:20,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:20,195 INFO L82 PathProgramCache]: Analyzing trace with hash 690414627, now seen corresponding path program 1 times [2020-07-21 13:35:20,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:20,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229716246] [2020-07-21 13:35:20,196 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-21 13:35:20,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:20,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:20,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:20,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:20,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:20,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:20,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229716246] [2020-07-21 13:35:20,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:20,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:20,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894455425] [2020-07-21 13:35:20,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:20,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:20,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:20,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:20,246 INFO L87 Difference]: Start difference. First operand 14216 states and 16902 transitions. Second operand 3 states. [2020-07-21 13:35:20,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:20,465 INFO L93 Difference]: Finished difference Result 23178 states and 27399 transitions. [2020-07-21 13:35:20,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:20,466 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 13:35:20,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:20,521 INFO L225 Difference]: With dead ends: 23178 [2020-07-21 13:35:20,522 INFO L226 Difference]: Without dead ends: 23176 [2020-07-21 13:35:20,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:20,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23176 states. [2020-07-21 13:35:21,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23176 to 22152. [2020-07-21 13:35:21,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22152 states. [2020-07-21 13:35:21,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22152 states to 22152 states and 25862 transitions. [2020-07-21 13:35:21,602 INFO L78 Accepts]: Start accepts. Automaton has 22152 states and 25862 transitions. Word has length 29 [2020-07-21 13:35:21,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:21,602 INFO L479 AbstractCegarLoop]: Abstraction has 22152 states and 25862 transitions. [2020-07-21 13:35:21,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:21,603 INFO L276 IsEmpty]: Start isEmpty. Operand 22152 states and 25862 transitions. [2020-07-21 13:35:21,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 13:35:21,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:21,650 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:21,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:21,865 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:21,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:21,866 INFO L82 PathProgramCache]: Analyzing trace with hash 103608613, now seen corresponding path program 1 times [2020-07-21 13:35:21,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:21,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013533442] [2020-07-21 13:35:21,866 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:21,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:21,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:21,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:21,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:21,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:21,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:21,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013533442] [2020-07-21 13:35:21,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:21,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:21,913 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808416024] [2020-07-21 13:35:21,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:21,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:21,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:21,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:21,914 INFO L87 Difference]: Start difference. First operand 22152 states and 25862 transitions. Second operand 3 states. [2020-07-21 13:35:22,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:22,106 INFO L93 Difference]: Finished difference Result 33292 states and 38792 transitions. [2020-07-21 13:35:22,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:22,107 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 13:35:22,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:22,171 INFO L225 Difference]: With dead ends: 33292 [2020-07-21 13:35:22,171 INFO L226 Difference]: Without dead ends: 22538 [2020-07-21 13:35:22,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:22,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22538 states. [2020-07-21 13:35:22,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22538 to 22536. [2020-07-21 13:35:22,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22536 states. [2020-07-21 13:35:22,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22536 states to 22536 states and 25862 transitions. [2020-07-21 13:35:22,684 INFO L78 Accepts]: Start accepts. Automaton has 22536 states and 25862 transitions. Word has length 29 [2020-07-21 13:35:22,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:22,685 INFO L479 AbstractCegarLoop]: Abstraction has 22536 states and 25862 transitions. [2020-07-21 13:35:22,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:22,685 INFO L276 IsEmpty]: Start isEmpty. Operand 22536 states and 25862 transitions. [2020-07-21 13:35:22,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 13:35:22,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:22,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:22,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:22,929 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:22,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:22,930 INFO L82 PathProgramCache]: Analyzing trace with hash -907508637, now seen corresponding path program 1 times [2020-07-21 13:35:22,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:22,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529189525] [2020-07-21 13:35:22,931 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:22,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:22,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:22,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:22,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:22,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:22,977 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:22,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529189525] [2020-07-21 13:35:22,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:22,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:22,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657093543] [2020-07-21 13:35:22,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:22,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:22,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:22,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:22,979 INFO L87 Difference]: Start difference. First operand 22536 states and 25862 transitions. Second operand 3 states. [2020-07-21 13:35:23,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:23,241 INFO L93 Difference]: Finished difference Result 50184 states and 56582 transitions. [2020-07-21 13:35:23,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:23,242 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 13:35:23,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:23,242 INFO L225 Difference]: With dead ends: 50184 [2020-07-21 13:35:23,242 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:35:23,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:23,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:35:23,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:35:23,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:35:23,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:35:23,317 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-21 13:35:23,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:23,317 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:35:23,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:23,317 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:35:23,317 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:35:23,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:23,534 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:35:23,588 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:35:23,588 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:23,588 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:35:23,589 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:35:23,589 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:35:23,589 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:35:23,589 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-21 13:35:23,589 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-21 13:35:23,589 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,589 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,590 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,591 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,591 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-21 13:35:23,591 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-21 13:35:23,591 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-21 13:35:23,591 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-21 13:35:23,591 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,592 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-21 13:35:23,593 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-21 13:35:23,594 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-21 13:35:23,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:35:23 BoogieIcfgContainer [2020-07-21 13:35:23,607 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:35:23,610 INFO L168 Benchmark]: Toolchain (without parser) took 15996.41 ms. Allocated memory was 135.8 MB in the beginning and 599.3 MB in the end (delta: 463.5 MB). Free memory was 100.4 MB in the beginning and 145.8 MB in the end (delta: -45.4 MB). Peak memory consumption was 418.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,610 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,611 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.56 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 88.9 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,611 INFO L168 Benchmark]: Boogie Preprocessor took 138.81 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 88.9 MB in the beginning and 177.3 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,611 INFO L168 Benchmark]: RCFGBuilder took 381.16 ms. Allocated memory is still 199.8 MB. Free memory was 177.3 MB in the beginning and 157.8 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,612 INFO L168 Benchmark]: TraceAbstraction took 15174.72 ms. Allocated memory was 199.8 MB in the beginning and 599.3 MB in the end (delta: 399.5 MB). Free memory was 157.8 MB in the beginning and 145.8 MB in the end (delta: 11.9 MB). Peak memory consumption was 411.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:35:23,614 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 294.56 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 88.9 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 138.81 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 88.9 MB in the beginning and 177.3 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 381.16 ms. Allocated memory is still 199.8 MB. Free memory was 177.3 MB in the beginning and 157.8 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15174.72 ms. Allocated memory was 199.8 MB in the beginning and 599.3 MB in the end (delta: 399.5 MB). Free memory was 157.8 MB in the beginning and 145.8 MB in the end (delta: 11.9 MB). Peak memory consumption was 411.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 161]: 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: 39]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 14.9s, OverallIterations: 28, TraceHistogramMax: 1, AutomataDifference: 3.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2384 SDtfs, 1153 SDslu, 1624 SDs, 0 SdLazy, 149 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 659 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22536occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 3.6s AutomataMinimizationTime, 28 MinimizatonAttempts, 4124 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 687 NumberOfCodeBlocks, 598 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 659 ConstructedInterpolants, 0 QuantifiedInterpolants, 31265 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2957 ConjunctsInSsa, 84 ConjunctsInUnsatCore, 28 InterpolantComputations, 28 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...