/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/recursive-simple/id_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:59:24,352 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:59:24,355 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:59:24,375 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:59:24,376 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:59:24,379 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:59:24,381 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:59:24,392 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:59:24,394 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:59:24,399 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:59:24,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:59:24,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:59:24,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:59:24,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:59:24,409 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:59:24,412 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:59:24,415 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:59:24,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:59:24,421 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:59:24,428 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:59:24,434 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:59:24,435 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:59:24,440 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:59:24,440 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:59:24,444 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:59:24,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:59:24,458 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:59:24,459 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:59:24,460 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 16:59:24,485 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:59:24,485 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:59:24,486 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:59:24,486 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:59:24,487 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:59:24,487 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:59:24,487 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:59:24,487 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:59:24,488 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:59:24,488 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:59:24,488 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:59:24,488 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:59:24,488 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:59:24,489 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:59:24,489 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:59:24,489 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:59:24,489 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:59:24,489 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:59:24,490 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:59:24,490 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:59:24,490 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:59:24,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:59:24,490 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:59:24,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:59:24,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:59:24,491 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:59:24,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:24,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:59:24,492 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:59:24,492 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 16:59:24,798 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:59:24,812 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:59:24,816 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:59:24,817 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:59:24,818 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:59:24,819 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o3.c [2020-07-20 16:59:24,904 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb783644/d4522b43e7344cf69715017a8c97e319/FLAG2f279192c [2020-07-20 16:59:25,429 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:59:25,430 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o3.c [2020-07-20 16:59:25,437 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb783644/d4522b43e7344cf69715017a8c97e319/FLAG2f279192c [2020-07-20 16:59:25,767 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb783644/d4522b43e7344cf69715017a8c97e319 [2020-07-20 16:59:25,777 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:59:25,781 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:59:25,782 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:59:25,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:59:25,786 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:59:25,787 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:59:25" (1/1) ... [2020-07-20 16:59:25,791 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7525ae21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:25, skipping insertion in model container [2020-07-20 16:59:25,791 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:59:25" (1/1) ... [2020-07-20 16:59:25,800 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:59:25,824 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:59:26,048 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:59:26,055 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:59:26,078 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:59:26,095 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:59:26,096 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26 WrapperNode [2020-07-20 16:59:26,097 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:59:26,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:59:26,098 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:59:26,098 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:59:26,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,117 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,124 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,125 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,129 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,132 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,133 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (1/1) ... [2020-07-20 16:59:26,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:59:26,137 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:59:26,137 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:59:26,137 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:59:26,138 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (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 16:59:26,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:59:26,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:59:26,328 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 16:59:26,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:59:26,328 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 16:59:26,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:59:26,329 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 16:59:26,329 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:59:26,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:59:26,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:59:26,508 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:59:26,508 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:59:26,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:59:26 BoogieIcfgContainer [2020-07-20 16:59:26,513 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:59:26,514 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:59:26,515 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:59:26,518 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:59:26,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:59:25" (1/3) ... [2020-07-20 16:59:26,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41187675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:59:26, skipping insertion in model container [2020-07-20 16:59:26,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:59:26" (2/3) ... [2020-07-20 16:59:26,520 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41187675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:59:26, skipping insertion in model container [2020-07-20 16:59:26,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:59:26" (3/3) ... [2020-07-20 16:59:26,522 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o3.c [2020-07-20 16:59:26,534 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:59:26,543 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:59:26,558 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:59:26,584 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:59:26,585 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:59:26,585 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:59:26,585 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:59:26,586 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:59:26,586 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:59:26,586 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:59:26,586 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:59:26,603 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 16:59:26,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:59:26,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:26,611 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:26,611 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:26,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:26,618 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 16:59:26,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:26,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395240889] [2020-07-20 16:59:26,627 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 16:59:26,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:59:26,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:26,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:59:26,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:26,846 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 16:59:26,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:59:26,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395240889] [2020-07-20 16:59:26,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:59:26,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:59:26,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566359006] [2020-07-20 16:59:26,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:59:26,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:26,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:59:26,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:59:26,870 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 16:59:26,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:26,928 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 16:59:26,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:59:26,931 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:59:26,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:26,943 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:59:26,943 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 16:59:26,947 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 16:59:26,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 16:59:26,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 16:59:26,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 16:59:26,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 16:59:26,993 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 16:59:26,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:26,994 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 16:59:26,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:59:26,994 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 16:59:26,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:59:26,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:26,997 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 16:59:27,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:27,213 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:27,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:27,214 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 16:59:27,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:27,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391776446] [2020-07-20 16:59:27,215 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 16:59:27,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:59:27,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:27,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:59:27,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:27,349 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 16:59:27,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:27,560 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 16:59:27,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391776446] [2020-07-20 16:59:27,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:59:27,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 16:59:27,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665799523] [2020-07-20 16:59:27,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:59:27,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:59:27,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:59:27,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:59:27,565 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 16:59:27,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:27,621 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 16:59:27,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:59:27,622 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 16:59:27,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:27,624 INFO L225 Difference]: With dead ends: 30 [2020-07-20 16:59:27,624 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:59:27,625 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 16:59:27,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:59:27,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:59:27,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:59:27,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 16:59:27,633 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 16:59:27,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:27,634 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 16:59:27,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:59:27,634 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 16:59:27,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:59:27,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:27,636 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 16:59:27,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:27,849 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:27,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:27,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 16:59:27,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:27,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455924207] [2020-07-20 16:59:27,851 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