/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 BIGGEST_EQUIVALENCE_CLASS --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/id2_b2_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:51:23,720 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:51:23,755 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:51:23,756 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:51:23,758 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:51:23,759 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:51:23,760 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:51:23,762 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:51:23,764 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:51:23,767 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:51:23,769 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:51:23,770 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:51:23,772 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:51:23,773 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:51:23,776 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:51:23,790 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 00:51:23,810 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:51:23,811 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:51:23,813 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:51:23,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:51:23,814 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:51:23,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:51:23,814 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:51:23,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:51:23,815 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:51:23,815 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:51:23,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:51:23,816 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:51:23,816 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:51:23,816 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:51:23,816 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:51:23,816 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:51:23,817 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:51:23,817 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:51:23,817 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:51:23,817 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:51:23,818 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:51:23,818 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:51:23,818 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:51:23,818 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:51:23,819 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:51:23,819 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:51:23,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:23,823 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:51:23,823 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:51:23,823 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:51:24,222 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:51:24,238 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:51:24,242 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:51:24,244 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:51:24,245 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:51:24,246 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-21 00:51:24,331 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be1db8802/3219cee304b94b50baa0c41905c9e831/FLAG890c12a47 [2020-07-21 00:51:24,796 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:51:24,797 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b2_o3.c [2020-07-21 00:51:24,804 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be1db8802/3219cee304b94b50baa0c41905c9e831/FLAG890c12a47 [2020-07-21 00:51:25,148 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be1db8802/3219cee304b94b50baa0c41905c9e831 [2020-07-21 00:51:25,159 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:51:25,163 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:51:25,164 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:51:25,164 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:51:25,169 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:51:25,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,174 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@488ef66a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25, skipping insertion in model container [2020-07-21 00:51:25,174 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,183 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:51:25,203 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:51:25,396 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:51:25,402 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:51:25,424 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:51:25,443 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:51:25,444 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25 WrapperNode [2020-07-21 00:51:25,444 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:51:25,445 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:51:25,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:51:25,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:51:25,461 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,461 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,468 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,474 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,479 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... [2020-07-21 00:51:25,481 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:51:25,482 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:51:25,482 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:51:25,482 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:51:25,484 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:51:25,680 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:51:25,680 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:51:25,680 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 00:51:25,681 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 00:51:25,681 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:51:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 00:51:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:51:25,681 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 00:51:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 00:51:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:51:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:51:25,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:51:25,948 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:51:25,949 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:51:25,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:51:25 BoogieIcfgContainer [2020-07-21 00:51:25,954 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:51:25,956 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:51:25,956 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:51:25,960 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:51:25,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:51:25" (1/3) ... [2020-07-21 00:51:25,961 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@444f1254 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:51:25, skipping insertion in model container [2020-07-21 00:51:25,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:25" (2/3) ... [2020-07-21 00:51:25,962 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@444f1254 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:51:25, skipping insertion in model container [2020-07-21 00:51:25,963 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:51:25" (3/3) ... [2020-07-21 00:51:25,965 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b2_o3.c [2020-07-21 00:51:25,978 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:51:25,988 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:51:26,006 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:51:26,037 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:51:26,038 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:51:26,038 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:51:26,038 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:51:26,039 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:51:26,039 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:51:26,039 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:51:26,039 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:51:26,064 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 00:51:26,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:51:26,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:26,075 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:26,076 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:26,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:26,083 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 00:51:26,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:26,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374087682] [2020-07-21 00:51:26,092 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 [2020-07-21 00:51:26,185 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:26,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:26,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:26,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:26,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:51:26,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:26,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374087682] [2020-07-21 00:51:26,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:26,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:26,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171225725] [2020-07-21 00:51:26,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:26,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:26,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:26,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:26,333 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 00:51:26,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:26,402 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 00:51:26,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:26,405 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:51:26,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:26,416 INFO L225 Difference]: With dead ends: 40 [2020-07-21 00:51:26,416 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 00:51:26,421 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 [2020-07-21 00:51:26,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 00:51:26,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 00:51:26,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:51:26,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 00:51:26,472 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 00:51:26,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:26,472 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 00:51:26,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:26,473 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 00:51:26,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:51:26,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:26,476 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:26,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:26,686 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:26,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:26,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 00:51:26,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:26,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459058579] [2020-07-21 00:51:26,689 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 [2020-07-21 00:51:26,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:26,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:26,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:26,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:26,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:51:26,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:26,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459058579] [2020-07-21 00:51:26,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:26,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:26,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647971651] [2020-07-21 00:51:26,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:26,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:26,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:26,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:26,780 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 00:51:26,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:26,814 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 00:51:26,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:26,815 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 00:51:26,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:26,817 INFO L225 Difference]: With dead ends: 44 [2020-07-21 00:51:26,817 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:51:26,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:26,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:51:26,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:51:26,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:51:26,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 00:51:26,830 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 00:51:26,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:26,831 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 00:51:26,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:26,831 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 00:51:26,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:51:26,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:26,833 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:27,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:27,049 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:27,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:27,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 00:51:27,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:27,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202678974] [2020-07-21 00:51:27,052 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 [2020-07-21 00:51:27,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:27,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:27,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 00:51:27,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:27,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:51:27,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:27,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202678974] [2020-07-21 00:51:27,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:27,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 00:51:27,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303029116] [2020-07-21 00:51:27,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 00:51:27,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:27,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 00:51:27,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 00:51:27,188 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 00:51:27,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:27,262 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 00:51:27,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:51:27,263 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 00:51:27,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:27,265 INFO L225 Difference]: With dead ends: 36 [2020-07-21 00:51:27,265 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:51:27,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:51:27,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:51:27,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:51:27,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:51:27,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 00:51:27,276 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 00:51:27,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:27,276 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 00:51:27,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 00:51:27,277 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 00:51:27,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:27,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:27,279 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:27,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:27,493 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:27,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:27,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 00:51:27,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:27,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052393749] [2020-07-21 00:51:27,496 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 [2020-07-21 00:51:27,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:27,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:27,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:27,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:27,601 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:51:27,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:27,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052393749] [2020-07-21 00:51:27,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:27,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:27,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461359602] [2020-07-21 00:51:27,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:27,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:27,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:27,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:27,606 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 00:51:27,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:27,637 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 00:51:27,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:27,638 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 00:51:27,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:27,640 INFO L225 Difference]: With dead ends: 48 [2020-07-21 00:51:27,640 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 00:51:27,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:27,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 00:51:27,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 00:51:27,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 00:51:27,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 00:51:27,652 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 00:51:27,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:27,653 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 00:51:27,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:27,653 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 00:51:27,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:27,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:27,655 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:27,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:27,871 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:27,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:27,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 00:51:27,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:27,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895630913] [2020-07-21 00:51:27,874 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 [2020-07-21 00:51:27,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:27,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:27,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:27,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:27,987 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:51:27,988 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:27,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895630913] [2020-07-21 00:51:27,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:27,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:27,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254436321] [2020-07-21 00:51:27,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:27,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:27,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:27,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:27,994 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 5 states. [2020-07-21 00:51:28,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:28,035 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2020-07-21 00:51:28,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:28,038 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 00:51:28,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:28,040 INFO L225 Difference]: With dead ends: 40 [2020-07-21 00:51:28,040 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 00:51:28,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:28,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 00:51:28,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 00:51:28,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 00:51:28,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 00:51:28,061 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 00:51:28,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:28,062 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 00:51:28,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:28,062 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 00:51:28,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:28,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:28,068 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:28,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:28,270 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:28,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:28,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 00:51:28,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:28,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882706762] [2020-07-21 00:51:28,273 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 [2020-07-21 00:51:28,309 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:28,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:28,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 00:51:28,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:28,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:51:28,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:28,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:51:28,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882706762] [2020-07-21 00:51:28,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:28,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 00:51:28,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428942851] [2020-07-21 00:51:28,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 00:51:28,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:28,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 00:51:28,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:51:28,922 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-21 00:51:29,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:29,184 INFO L93 Difference]: Finished difference Result 56 states and 65 transitions. [2020-07-21 00:51:29,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 00:51:29,185 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-21 00:51:29,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:29,186 INFO L225 Difference]: With dead ends: 56 [2020-07-21 00:51:29,186 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 00:51:29,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:51:29,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 00:51:29,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 00:51:29,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 00:51:29,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 00:51:29,189 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 00:51:29,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:29,190 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 00:51:29,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 00:51:29,190 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 00:51:29,190 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 00:51:29,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:29,406 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 00:51:29,492 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 00:51:29,492 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:51:29,493 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 00:51:29,493 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-21 00:51:29,493 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-21 00:51:29,493 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-21 00:51:29,494 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-21 00:51:29,494 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-21 00:51:29,494 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-21 00:51:29,494 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:51:29,495 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 00:51:29,495 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 00:51:29,495 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 00:51:29,495 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-21 00:51:29,495 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-21 00:51:29,496 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 00:51:29,496 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-21 00:51:29,496 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-21 00:51:29,496 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 00:51:29,497 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 00:51:29,497 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-21 00:51:29,497 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-21 00:51:29,497 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 00:51:29,497 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-21 00:51:29,498 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-21 00:51:29,498 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 00:51:29,498 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 00:51:29,498 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 00:51:29,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:51:29 BoogieIcfgContainer [2020-07-21 00:51:29,509 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:51:29,515 INFO L168 Benchmark]: Toolchain (without parser) took 4350.92 ms. Allocated memory was 140.0 MB in the beginning and 234.9 MB in the end (delta: 94.9 MB). Free memory was 104.8 MB in the beginning and 114.2 MB in the end (delta: -9.4 MB). Peak memory consumption was 85.5 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,518 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 140.0 MB. Free memory was 123.1 MB in the beginning and 122.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,521 INFO L168 Benchmark]: CACSL2BoogieTranslator took 280.75 ms. Allocated memory is still 140.0 MB. Free memory was 104.4 MB in the beginning and 94.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,522 INFO L168 Benchmark]: Boogie Preprocessor took 35.94 ms. Allocated memory is still 140.0 MB. Free memory was 94.9 MB in the beginning and 93.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,530 INFO L168 Benchmark]: RCFGBuilder took 472.29 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.5 MB in the beginning and 169.3 MB in the end (delta: -75.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,532 INFO L168 Benchmark]: TraceAbstraction took 3553.86 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 168.7 MB in the beginning and 114.2 MB in the end (delta: 54.5 MB). Peak memory consumption was 87.0 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:29,552 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 140.0 MB. Free memory was 123.1 MB in the beginning and 122.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 280.75 ms. Allocated memory is still 140.0 MB. Free memory was 104.4 MB in the beginning and 94.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.94 ms. Allocated memory is still 140.0 MB. Free memory was 94.9 MB in the beginning and 93.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 472.29 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.5 MB in the beginning and 169.3 MB in the end (delta: -75.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3553.86 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 168.7 MB in the beginning and 114.2 MB in the end (delta: 54.5 MB). Peak memory consumption was 87.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 25]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.3s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 168 SDtfs, 14 SDslu, 840 SDs, 0 SdLazy, 186 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 159 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 9 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 134 NumberOfCodeBlocks, 122 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 154 ConstructedInterpolants, 0 QuantifiedInterpolants, 6774 SizeOfPredicates, 9 NumberOfNonLiveVariables, 280 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 7 InterpolantComputations, 5 PerfectInterpolantSequences, 12/16 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...