/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_5.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:23,085 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:23,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:23,101 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:12:23,101 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:12:23,102 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:12:23,104 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:12:23,105 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:12:23,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:12:23,108 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:12:23,109 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:12:23,111 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:12:23,111 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:23,112 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:23,113 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:23,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:23,116 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:23,117 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:23,118 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:23,121 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:23,123 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:23,124 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:23,125 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:23,126 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:23,130 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:23,139 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:12:23,140 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:12:23,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:12:23,142 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:12:23,165 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:23,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:23,166 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:23,167 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:23,167 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:23,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:23,167 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:23,167 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:23,168 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:23,168 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:23,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:23,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:23,168 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:23,169 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:23,169 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:23,169 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:23,169 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:23,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:23,170 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:23,170 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:23,170 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:23,170 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:23,171 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:23,171 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:23,171 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:23,171 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:23,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,172 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:23,172 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:23,172 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:12:23,491 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:23,515 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:23,522 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:23,524 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:23,527 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:23,530 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_5.c [2020-07-20 17:12:23,631 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c910d346/dadc94f643f5442bbd3d2b1d74421e47/FLAG8597a0861 [2020-07-20 17:12:24,233 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:24,234 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_5.c [2020-07-20 17:12:24,243 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c910d346/dadc94f643f5442bbd3d2b1d74421e47/FLAG8597a0861 [2020-07-20 17:12:24,570 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6c910d346/dadc94f643f5442bbd3d2b1d74421e47 [2020-07-20 17:12:24,583 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:24,587 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:24,589 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:24,589 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:24,593 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:24,594 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,598 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18f0dfff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24, skipping insertion in model container [2020-07-20 17:12:24,598 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,606 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:24,625 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:24,817 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:24,823 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:24,847 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:24,864 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:24,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24 WrapperNode [2020-07-20 17:12:24,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:24,866 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:24,866 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:24,866 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:24,879 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,880 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,886 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,886 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,891 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,995 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:24,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... [2020-07-20 17:12:25,004 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:25,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:25,006 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:25,007 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:25,008 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:25,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:25,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:25,098 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:25,098 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:25,099 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:25,099 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:25,099 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:25,100 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:25,351 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:25,352 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:25,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:25 BoogieIcfgContainer [2020-07-20 17:12:25,357 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:25,359 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:25,359 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:25,363 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:25,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:24" (1/3) ... [2020-07-20 17:12:25,365 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a871524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:25, skipping insertion in model container [2020-07-20 17:12:25,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:24" (2/3) ... [2020-07-20 17:12:25,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a871524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:25, skipping insertion in model container [2020-07-20 17:12:25,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:25" (3/3) ... [2020-07-20 17:12:25,371 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_5.c [2020-07-20 17:12:25,387 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:25,402 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:25,428 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:25,464 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:25,464 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:25,464 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:25,464 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:25,465 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:25,465 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:25,466 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:25,466 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:25,490 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-20 17:12:25,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:12:25,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,503 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,503 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,512 INFO L82 PathProgramCache]: Analyzing trace with hash 316328318, now seen corresponding path program 1 times [2020-07-20 17:12:25,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530332573] [2020-07-20 17:12:25,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:25,684 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530332573] [2020-07-20 17:12:25,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233073190] [2020-07-20 17:12:25,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,709 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-07-20 17:12:25,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,780 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2020-07-20 17:12:25,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,783 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-20 17:12:25,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,796 INFO L225 Difference]: With dead ends: 57 [2020-07-20 17:12:25,797 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 17:12:25,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 17:12:25,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2020-07-20 17:12:25,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 17:12:25,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 49 transitions. [2020-07-20 17:12:25,848 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 49 transitions. Word has length 15 [2020-07-20 17:12:25,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,848 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 49 transitions. [2020-07-20 17:12:25,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,849 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 49 transitions. [2020-07-20 17:12:25,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:12:25,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,850 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,065 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,066 INFO L82 PathProgramCache]: Analyzing trace with hash -493018308, now seen corresponding path program 1 times [2020-07-20 17:12:26,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003782786] [2020-07-20 17:12:26,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,115 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,129 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003782786] [2020-07-20 17:12:26,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122864638] [2020-07-20 17:12:26,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,134 INFO L87 Difference]: Start difference. First operand 30 states and 49 transitions. Second operand 3 states. [2020-07-20 17:12:26,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,164 INFO L93 Difference]: Finished difference Result 67 states and 112 transitions. [2020-07-20 17:12:26,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,165 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-20 17:12:26,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,167 INFO L225 Difference]: With dead ends: 67 [2020-07-20 17:12:26,167 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 17:12:26,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 17:12:26,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-07-20 17:12:26,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 17:12:26,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 65 transitions. [2020-07-20 17:12:26,179 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 65 transitions. Word has length 15 [2020-07-20 17:12:26,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,180 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 65 transitions. [2020-07-20 17:12:26,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,180 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 65 transitions. [2020-07-20 17:12:26,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:12:26,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,182 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,395 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1216458266, now seen corresponding path program 1 times [2020-07-20 17:12:26,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792833211] [2020-07-20 17:12:26,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792833211] [2020-07-20 17:12:26,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707377667] [2020-07-20 17:12:26,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,467 INFO L87 Difference]: Start difference. First operand 40 states and 65 transitions. Second operand 3 states. [2020-07-20 17:12:26,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,496 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 17:12:26,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,497 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 17:12:26,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,499 INFO L225 Difference]: With dead ends: 63 [2020-07-20 17:12:26,499 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 17:12:26,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 17:12:26,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2020-07-20 17:12:26,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 17:12:26,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 67 transitions. [2020-07-20 17:12:26,509 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 67 transitions. Word has length 16 [2020-07-20 17:12:26,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,510 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 67 transitions. [2020-07-20 17:12:26,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,510 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 67 transitions. [2020-07-20 17:12:26,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:12:26,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,511 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,726 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1896516636, now seen corresponding path program 1 times [2020-07-20 17:12:26,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239059643] [2020-07-20 17:12:26,728 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,793 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:26,794 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239059643] [2020-07-20 17:12:26,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888704284] [2020-07-20 17:12:26,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,797 INFO L87 Difference]: Start difference. First operand 43 states and 67 transitions. Second operand 3 states. [2020-07-20 17:12:26,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,821 INFO L93 Difference]: Finished difference Result 76 states and 120 transitions. [2020-07-20 17:12:26,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 17:12:26,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,824 INFO L225 Difference]: With dead ends: 76 [2020-07-20 17:12:26,824 INFO L226 Difference]: Without dead ends: 74 [2020-07-20 17:12:26,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-20 17:12:26,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2020-07-20 17:12:26,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 17:12:26,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 88 transitions. [2020-07-20 17:12:26,836 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 88 transitions. Word has length 16 [2020-07-20 17:12:26,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,836 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 88 transitions. [2020-07-20 17:12:26,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,837 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 88 transitions. [2020-07-20 17:12:26,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:12:26,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,838 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,053 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1087170010, now seen corresponding path program 1 times [2020-07-20 17:12:27,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805218893] [2020-07-20 17:12:27,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:27,107 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805218893] [2020-07-20 17:12:27,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106382324] [2020-07-20 17:12:27,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,111 INFO L87 Difference]: Start difference. First operand 56 states and 88 transitions. Second operand 3 states. [2020-07-20 17:12:27,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,143 INFO L93 Difference]: Finished difference Result 124 states and 198 transitions. [2020-07-20 17:12:27,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,145 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 17:12:27,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,147 INFO L225 Difference]: With dead ends: 124 [2020-07-20 17:12:27,147 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 17:12:27,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 17:12:27,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2020-07-20 17:12:27,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-20 17:12:27,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 114 transitions. [2020-07-20 17:12:27,159 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 114 transitions. Word has length 16 [2020-07-20 17:12:27,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,160 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 114 transitions. [2020-07-20 17:12:27,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,160 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 114 transitions. [2020-07-20 17:12:27,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:27,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,162 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,364 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1337311087, now seen corresponding path program 1 times [2020-07-20 17:12:27,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246710267] [2020-07-20 17:12:27,366 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,402 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:27,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:27,417 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246710267] [2020-07-20 17:12:27,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376529470] [2020-07-20 17:12:27,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,420 INFO L87 Difference]: Start difference. First operand 74 states and 114 transitions. Second operand 3 states. [2020-07-20 17:12:27,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,461 INFO L93 Difference]: Finished difference Result 111 states and 169 transitions. [2020-07-20 17:12:27,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,461 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:27,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,464 INFO L225 Difference]: With dead ends: 111 [2020-07-20 17:12:27,464 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 17:12:27,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 17:12:27,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-20 17:12:27,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 17:12:27,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 114 transitions. [2020-07-20 17:12:27,475 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 114 transitions. Word has length 17 [2020-07-20 17:12:27,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,475 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 114 transitions. [2020-07-20 17:12:27,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 114 transitions. [2020-07-20 17:12:27,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:27,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,477 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,685 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,686 INFO L82 PathProgramCache]: Analyzing trace with hash -657252717, now seen corresponding path program 1 times [2020-07-20 17:12:27,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411535884] [2020-07-20 17:12:27,687 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:27,737 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411535884] [2020-07-20 17:12:27,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464513804] [2020-07-20 17:12:27,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,740 INFO L87 Difference]: Start difference. First operand 76 states and 114 transitions. Second operand 3 states. [2020-07-20 17:12:27,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,772 INFO L93 Difference]: Finished difference Result 132 states and 200 transitions. [2020-07-20 17:12:27,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,772 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:27,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,774 INFO L225 Difference]: With dead ends: 132 [2020-07-20 17:12:27,774 INFO L226 Difference]: Without dead ends: 130 [2020-07-20 17:12:27,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-20 17:12:27,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 104. [2020-07-20 17:12:27,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-20 17:12:27,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 154 transitions. [2020-07-20 17:12:27,788 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 154 transitions. Word has length 17 [2020-07-20 17:12:27,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,789 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 154 transitions. [2020-07-20 17:12:27,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,789 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 154 transitions. [2020-07-20 17:12:27,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:12:27,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,791 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,005 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1466599343, now seen corresponding path program 1 times [2020-07-20 17:12:28,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005111927] [2020-07-20 17:12:28,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:28,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:28,057 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005111927] [2020-07-20 17:12:28,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890284320] [2020-07-20 17:12:28,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,060 INFO L87 Difference]: Start difference. First operand 104 states and 154 transitions. Second operand 3 states. [2020-07-20 17:12:28,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,087 INFO L93 Difference]: Finished difference Result 232 states and 344 transitions. [2020-07-20 17:12:28,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,088 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 17:12:28,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,089 INFO L225 Difference]: With dead ends: 232 [2020-07-20 17:12:28,089 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 17:12:28,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 17:12:28,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-20 17:12:28,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 17:12:28,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 194 transitions. [2020-07-20 17:12:28,106 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 194 transitions. Word has length 17 [2020-07-20 17:12:28,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,107 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 194 transitions. [2020-07-20 17:12:28,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,107 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 194 transitions. [2020-07-20 17:12:28,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:28,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,109 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,318 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1100217935, now seen corresponding path program 1 times [2020-07-20 17:12:28,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481246122] [2020-07-20 17:12:28,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:28,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:28,364 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481246122] [2020-07-20 17:12:28,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091436613] [2020-07-20 17:12:28,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,367 INFO L87 Difference]: Start difference. First operand 136 states and 194 transitions. Second operand 3 states. [2020-07-20 17:12:28,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,397 INFO L93 Difference]: Finished difference Result 204 states and 288 transitions. [2020-07-20 17:12:28,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,398 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:28,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,400 INFO L225 Difference]: With dead ends: 204 [2020-07-20 17:12:28,400 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 17:12:28,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 17:12:28,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2020-07-20 17:12:28,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 17:12:28,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 194 transitions. [2020-07-20 17:12:28,413 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 194 transitions. Word has length 18 [2020-07-20 17:12:28,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,414 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 194 transitions. [2020-07-20 17:12:28,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,414 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 194 transitions. [2020-07-20 17:12:28,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:28,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,416 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,633 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1780276305, now seen corresponding path program 1 times [2020-07-20 17:12:28,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805993525] [2020-07-20 17:12:28,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:28,676 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805993525] [2020-07-20 17:12:28,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141703946] [2020-07-20 17:12:28,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,679 INFO L87 Difference]: Start difference. First operand 140 states and 194 transitions. Second operand 3 states. [2020-07-20 17:12:28,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,698 INFO L93 Difference]: Finished difference Result 236 states and 328 transitions. [2020-07-20 17:12:28,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,699 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:28,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,700 INFO L225 Difference]: With dead ends: 236 [2020-07-20 17:12:28,701 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 17:12:28,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 17:12:28,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 200. [2020-07-20 17:12:28,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 17:12:28,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 270 transitions. [2020-07-20 17:12:28,724 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 270 transitions. Word has length 18 [2020-07-20 17:12:28,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,725 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 270 transitions. [2020-07-20 17:12:28,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,725 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 270 transitions. [2020-07-20 17:12:28,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:12:28,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,927 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,928 INFO L82 PathProgramCache]: Analyzing trace with hash 970929679, now seen corresponding path program 1 times [2020-07-20 17:12:28,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781458114] [2020-07-20 17:12:28,929 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781458114] [2020-07-20 17:12:29,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428257912] [2020-07-20 17:12:29,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,013 INFO L87 Difference]: Start difference. First operand 200 states and 270 transitions. Second operand 3 states. [2020-07-20 17:12:29,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,058 INFO L93 Difference]: Finished difference Result 444 states and 592 transitions. [2020-07-20 17:12:29,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 17:12:29,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,063 INFO L225 Difference]: With dead ends: 444 [2020-07-20 17:12:29,064 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 17:12:29,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 17:12:29,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-20 17:12:29,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 17:12:29,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 326 transitions. [2020-07-20 17:12:29,117 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 326 transitions. Word has length 18 [2020-07-20 17:12:29,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,117 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 326 transitions. [2020-07-20 17:12:29,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,118 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 326 transitions. [2020-07-20 17:12:29,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:29,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,325 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,326 INFO L82 PathProgramCache]: Analyzing trace with hash -645793370, now seen corresponding path program 1 times [2020-07-20 17:12:29,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303643630] [2020-07-20 17:12:29,327 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303643630] [2020-07-20 17:12:29,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596761056] [2020-07-20 17:12:29,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,378 INFO L87 Difference]: Start difference. First operand 256 states and 326 transitions. Second operand 3 states. [2020-07-20 17:12:29,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,399 INFO L93 Difference]: Finished difference Result 384 states and 484 transitions. [2020-07-20 17:12:29,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,399 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:29,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,401 INFO L225 Difference]: With dead ends: 384 [2020-07-20 17:12:29,402 INFO L226 Difference]: Without dead ends: 266 [2020-07-20 17:12:29,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-20 17:12:29,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 264. [2020-07-20 17:12:29,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-20 17:12:29,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 326 transitions. [2020-07-20 17:12:29,417 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 326 transitions. Word has length 19 [2020-07-20 17:12:29,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,418 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 326 transitions. [2020-07-20 17:12:29,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,418 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 326 transitions. [2020-07-20 17:12:29,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:29,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,634 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,635 INFO L82 PathProgramCache]: Analyzing trace with hash 34265000, now seen corresponding path program 1 times [2020-07-20 17:12:29,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833331963] [2020-07-20 17:12:29,636 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,678 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833331963] [2020-07-20 17:12:29,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964649242] [2020-07-20 17:12:29,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,680 INFO L87 Difference]: Start difference. First operand 264 states and 326 transitions. Second operand 3 states. [2020-07-20 17:12:29,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,702 INFO L93 Difference]: Finished difference Result 426 states and 519 transitions. [2020-07-20 17:12:29,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,703 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:29,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,705 INFO L225 Difference]: With dead ends: 426 [2020-07-20 17:12:29,706 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 17:12:29,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 17:12:29,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 392. [2020-07-20 17:12:29,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-20 17:12:29,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 470 transitions. [2020-07-20 17:12:29,724 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 470 transitions. Word has length 19 [2020-07-20 17:12:29,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,725 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 470 transitions. [2020-07-20 17:12:29,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,725 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 470 transitions. [2020-07-20 17:12:29,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 17:12:29,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,941 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,942 INFO L82 PathProgramCache]: Analyzing trace with hash -775081626, now seen corresponding path program 1 times [2020-07-20 17:12:29,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313415603] [2020-07-20 17:12:29,943 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:12:29,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313415603] [2020-07-20 17:12:29,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547020029] [2020-07-20 17:12:29,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,989 INFO L87 Difference]: Start difference. First operand 392 states and 470 transitions. Second operand 3 states. [2020-07-20 17:12:30,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,023 INFO L93 Difference]: Finished difference Result 856 states and 998 transitions. [2020-07-20 17:12:30,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,024 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 17:12:30,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,025 INFO L225 Difference]: With dead ends: 856 [2020-07-20 17:12:30,025 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:30,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:30,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:30,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:30,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:30,029 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 19 [2020-07-20 17:12:30,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,029 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:30,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,030 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:30,030 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:30,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,248 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:30,316 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:30,316 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:30,316 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:30,317 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:30,317 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:30,317 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:30,317 INFO L268 CegarLoopResult]: For program point L64(line 64) no Hoare annotation was computed. [2020-07-20 17:12:30,317 INFO L271 CegarLoopResult]: At program point L89(lines 5 93) the Hoare annotation is: true [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 93) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L73-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L69(line 69) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L57-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L53-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L49-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,318 INFO L268 CegarLoopResult]: For program point L78-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,319 INFO L268 CegarLoopResult]: For program point L45-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,319 INFO L268 CegarLoopResult]: For program point L74(line 74) no Hoare annotation was computed. [2020-07-20 17:12:30,319 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-20 17:12:30,319 INFO L268 CegarLoopResult]: For program point L41-2(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,319 INFO L271 CegarLoopResult]: At program point L83-1(lines 24 88) the Hoare annotation is: true [2020-07-20 17:12:30,319 INFO L268 CegarLoopResult]: For program point L79(line 79) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 93) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 91) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L268 CegarLoopResult]: For program point L63-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 93) the Hoare annotation is: true [2020-07-20 17:12:30,320 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L268 CegarLoopResult]: For program point L84(line 84) no Hoare annotation was computed. [2020-07-20 17:12:30,320 INFO L264 CegarLoopResult]: At program point L84-1(lines 5 93) the Hoare annotation is: false [2020-07-20 17:12:30,321 INFO L268 CegarLoopResult]: For program point L68-1(lines 24 88) no Hoare annotation was computed. [2020-07-20 17:12:30,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:30 BoogieIcfgContainer [2020-07-20 17:12:30,332 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:30,335 INFO L168 Benchmark]: Toolchain (without parser) took 5749.09 ms. Allocated memory was 136.8 MB in the beginning and 231.2 MB in the end (delta: 94.4 MB). Free memory was 101.3 MB in the beginning and 86.8 MB in the end (delta: 14.5 MB). Peak memory consumption was 108.9 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,336 INFO L168 Benchmark]: CDTParser took 1.11 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,336 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.81 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 90.9 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,337 INFO L168 Benchmark]: Boogie Preprocessor took 138.68 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.9 MB in the beginning and 179.9 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,338 INFO L168 Benchmark]: RCFGBuilder took 352.37 ms. Allocated memory is still 200.8 MB. Free memory was 179.9 MB in the beginning and 164.6 MB in the end (delta: 15.3 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,339 INFO L168 Benchmark]: TraceAbstraction took 4972.80 ms. Allocated memory was 200.8 MB in the beginning and 231.2 MB in the end (delta: 30.4 MB). Free memory was 163.9 MB in the beginning and 86.8 MB in the end (delta: 77.1 MB). Peak memory consumption was 107.5 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:30,342 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.11 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 276.81 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 90.9 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 138.68 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.9 MB in the beginning and 179.9 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 352.37 ms. Allocated memory is still 200.8 MB. Free memory was 179.9 MB in the beginning and 164.6 MB in the end (delta: 15.3 MB). Peak memory consumption was 15.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4972.80 ms. Allocated memory was 200.8 MB in the beginning and 231.2 MB in the end (delta: 30.4 MB). Free memory was 163.9 MB in the beginning and 86.8 MB in the end (delta: 77.1 MB). Peak memory consumption was 107.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 91]: 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: 24]: 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, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.7s, OverallIterations: 14, TraceHistogramMax: 1, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 654 SDtfs, 285 SDslu, 428 SDs, 0 SdLazy, 75 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 226 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=392occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 14 MinimizatonAttempts, 138 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 42 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 240 NumberOfCodeBlocks, 233 NumberOfCodeBlocksAsserted, 53 NumberOfCheckSat, 226 ConstructedInterpolants, 0 QuantifiedInterpolants, 6424 SizeOfPredicates, 0 NumberOfNonLiveVariables, 904 ConjunctsInSsa, 42 ConjunctsInUnsatCore, 14 InterpolantComputations, 14 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...