/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:38:14,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:38:14,946 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:38:14,967 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:38:14,967 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:38:14,969 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:38:14,970 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:38:14,972 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:38:14,974 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:38:14,975 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:38:14,976 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:38:14,978 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:38:14,978 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:38:14,979 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:38:14,980 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:38:14,982 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:38:14,983 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:38:14,984 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:38:14,986 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:38:14,988 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:38:14,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:38:14,992 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:38:14,993 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:38:14,994 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:38:14,997 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:38:15,006 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:38:15,007 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:38:15,008 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:38:15,009 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:38:15,026 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:38:15,026 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:38:15,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:38:15,028 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:38:15,028 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:38:15,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:38:15,028 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:38:15,029 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:38:15,029 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:38:15,029 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:38:15,029 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:38:15,030 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:38:15,030 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:38:15,030 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:38:15,030 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:38:15,030 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:38:15,031 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:38:15,031 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:38:15,031 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:38:15,031 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:38:15,032 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:38:15,032 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:38:15,032 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:38:15,032 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:38:15,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:38:15,033 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:38:15,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:15,033 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:38:15,033 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:38:15,034 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:38:15,350 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:38:15,366 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:38:15,370 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:38:15,372 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:38:15,372 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:38:15,373 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 13:38:15,464 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b5871c3f/aae84184e94f4a63a856b673187ed260/FLAGaf8f2bb49 [2020-07-20 13:38:16,048 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:38:16,050 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 13:38:16,059 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b5871c3f/aae84184e94f4a63a856b673187ed260/FLAGaf8f2bb49 [2020-07-20 13:38:16,392 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b5871c3f/aae84184e94f4a63a856b673187ed260 [2020-07-20 13:38:16,402 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:38:16,406 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:38:16,407 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:16,408 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:38:16,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:38:16,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,420 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7922760e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16, skipping insertion in model container [2020-07-20 13:38:16,421 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,430 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:38:16,448 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:38:16,631 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:16,636 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:38:16,654 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:16,669 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:38:16,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16 WrapperNode [2020-07-20 13:38:16,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:16,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:38:16,672 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:38:16,672 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:38:16,686 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,686 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... [2020-07-20 13:38:16,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:38:16,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:38:16,702 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:38:16,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:38:16,703 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:38:16,861 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:38:16,861 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:38:16,861 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 13:38:16,862 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:38:16,862 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 13:38:16,862 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:38:16,862 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 13:38:16,862 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:38:16,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:38:16,863 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:38:17,051 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:38:17,051 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:38:17,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:17 BoogieIcfgContainer [2020-07-20 13:38:17,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:38:17,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:38:17,058 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:38:17,062 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:38:17,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:38:16" (1/3) ... [2020-07-20 13:38:17,064 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cafed78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:17, skipping insertion in model container [2020-07-20 13:38:17,064 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:16" (2/3) ... [2020-07-20 13:38:17,065 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cafed78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:17, skipping insertion in model container [2020-07-20 13:38:17,065 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:17" (3/3) ... [2020-07-20 13:38:17,067 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-20 13:38:17,079 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:38:17,087 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:38:17,104 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:38:17,134 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:38:17,134 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:38:17,134 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:38:17,135 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:38:17,135 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:38:17,135 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:38:17,135 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:38:17,135 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:38:17,158 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 13:38:17,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:38:17,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:17,169 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:17,169 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:17,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:17,179 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 13:38:17,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:17,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663551419] [2020-07-20 13:38:17,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:17,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:17,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:38:17,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:38:17,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:38:17,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663551419] [2020-07-20 13:38:17,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:38:17,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:38:17,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554046249] [2020-07-20 13:38:17,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:38:17,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:17,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:38:17,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:17,482 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 13:38:17,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:17,554 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 13:38:17,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:38:17,556 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:38:17,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:17,568 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:38:17,569 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 13:38:17,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:17,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 13:38:17,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 13:38:17,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 13:38:17,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 13:38:17,625 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 13:38:17,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:17,626 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 13:38:17,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:38:17,626 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 13:38:17,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:38:17,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:17,629 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:17,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,844 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:17,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:17,844 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 13:38:17,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:17,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324619837] [2020-07-20 13:38:17,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:17,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:17,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:38:17,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:17,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:17,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:18,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324619837] [2020-07-20 13:38:18,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:18,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 13:38:18,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404619674] [2020-07-20 13:38:18,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:38:18,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:18,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:38:18,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:18,133 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 13:38:18,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:18,221 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 13:38:18,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:18,222 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 13:38:18,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:18,223 INFO L225 Difference]: With dead ends: 30 [2020-07-20 13:38:18,223 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:38:18,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:18,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:38:18,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:38:18,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:38:18,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 13:38:18,232 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 13:38:18,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:18,233 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 13:38:18,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:38:18,233 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 13:38:18,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:38:18,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:18,235 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:18,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:18,436 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:18,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:18,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 13:38:18,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:18,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44171932] [2020-07-20 13:38:18,439 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:18,487 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:18,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:18,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:38:18,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:18,597 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:18,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:21,154 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 2 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:21,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44171932] [2020-07-20 13:38:21,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:21,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 13:38:21,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847740565] [2020-07-20 13:38:21,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:38:21,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:21,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:38:21,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=315, Unknown=1, NotChecked=0, Total=380 [2020-07-20 13:38:21,158 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 13:38:23,374 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-20 13:38:23,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:23,629 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 13:38:23,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:38:23,636 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 13:38:23,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:23,639 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:38:23,639 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 13:38:23,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=98, Invalid=453, Unknown=1, NotChecked=0, Total=552 [2020-07-20 13:38:23,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 13:38:23,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 13:38:23,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:38:23,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 13:38:23,662 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 13:38:23,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:23,662 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 13:38:23,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:38:23,663 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 13:38:23,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 13:38:23,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:23,666 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:23,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,869 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:23,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:23,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 13:38:23,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:23,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357099552] [2020-07-20 13:38:23,872 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:23,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:23,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 13:38:23,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:24,209 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:24,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 74 refuted. 3 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:32,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357099552] [2020-07-20 13:38:32,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:32,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 13:38:32,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489011532] [2020-07-20 13:38:32,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 13:38:32,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:32,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 13:38:32,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1073, Unknown=3, NotChecked=0, Total=1260 [2020-07-20 13:38:32,099 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 13:38:34,946 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 13:38:35,520 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 13:38:35,890 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-20 13:38:40,313 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 13:38:45,018 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 13:38:50,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:50,118 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 13:38:50,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 13:38:50,119 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 13:38:50,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:50,121 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:38:50,122 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:38:50,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=381, Invalid=1869, Unknown=6, NotChecked=0, Total=2256 [2020-07-20 13:38:50,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:38:50,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 13:38:50,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:38:50,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 13:38:50,147 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 13:38:50,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:50,148 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 13:38:50,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 13:38:50,148 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 13:38:50,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 13:38:50,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:50,154 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:50,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:50,356 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:50,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:50,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 13:38:50,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:50,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215619458] [2020-07-20 13:38:50,359 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:51,786 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:51,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:51,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 13:38:51,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:52,550 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:38:52,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:21,046 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 334 refuted. 11 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:39:21,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215619458] [2020-07-20 13:39:21,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:21,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 13:39:21,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474477702] [2020-07-20 13:39:21,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 13:39:21,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:21,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 13:39:21,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3929, Unknown=11, NotChecked=0, Total=4556 [2020-07-20 13:39:21,053 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 13:39:25,676 WARN L193 SmtUtils]: Spent 470.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-20 13:39:33,842 WARN L193 SmtUtils]: Spent 1.71 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 13:39:37,187 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-20 13:39:44,148 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 13:39:50,706 WARN L193 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-20 13:39:55,159 WARN L193 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 13:40:01,034 WARN L193 SmtUtils]: Spent 2.69 s on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-20 13:40:12,972 WARN L193 SmtUtils]: Spent 6.25 s on a formula simplification. DAG size of input: 61 DAG size of output: 16 [2020-07-20 13:40:18,872 WARN L193 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 13:40:24,126 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 13:40:28,929 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 13:40:31,572 WARN L193 SmtUtils]: Spent 493.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 13:40:37,025 WARN L193 SmtUtils]: Spent 3.25 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 13:40:42,698 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 13:40:50,784 WARN L193 SmtUtils]: Spent 2.27 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 13:41:04,107 WARN L193 SmtUtils]: Spent 4.40 s on a formula simplification. DAG size of input: 41 DAG size of output: 16 [2020-07-20 13:41:09,760 WARN L193 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 13:41:22,355 WARN L193 SmtUtils]: Spent 2.28 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 13:41:38,166 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-20 13:41:55,416 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 13:42:08,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:08,859 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 13:42:08,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 13:42:08,861 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 13:42:08,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:08,867 INFO L225 Difference]: With dead ends: 114 [2020-07-20 13:42:08,868 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:42:08,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 193.5s TimeCoverageRelationStatistics Valid=1523, Invalid=7573, Unknown=24, NotChecked=0, Total=9120 [2020-07-20 13:42:08,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:42:08,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 13:42:08,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 13:42:08,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 13:42:08,907 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 13:42:08,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:08,908 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 13:42:08,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 13:42:08,908 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 13:42:08,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 13:42:08,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:08,913 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:09,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:09,118 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:09,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:09,119 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 13:42:09,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:09,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613833301] [2020-07-20 13:42:09,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:09,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:09,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:09,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 13:42:09,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:13,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:42:13,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:56,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1394 refuted. 63 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:44:56,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613833301] [2020-07-20 13:44:56,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:56,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 13:44:56,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861830942] [2020-07-20 13:44:56,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 13:44:56,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:56,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 13:44:56,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14983, Unknown=61, NotChecked=0, Total=17292 [2020-07-20 13:44:56,903 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 13:45:57,135 WARN L193 SmtUtils]: Spent 5.12 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 13:46:45,006 WARN L193 SmtUtils]: Spent 5.46 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 13:47:38,486 WARN L193 SmtUtils]: Spent 8.70 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 13:48:37,371 WARN L193 SmtUtils]: Spent 8.95 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 13:49:31,969 WARN L193 SmtUtils]: Spent 8.12 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 13:50:19,843 WARN L193 SmtUtils]: Spent 2.40 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 13:51:12,483 WARN L193 SmtUtils]: Spent 6.92 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 13:51:57,768 WARN L193 SmtUtils]: Spent 4.50 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-20 13:52:37,290 WARN L193 SmtUtils]: Spent 3.67 s on a formula simplification. DAG size of input: 138 DAG size of output: 13