/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_b5_o10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:51:49,223 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:51:49,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:51:49,263 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:51:49,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:51:49,267 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:51:49,268 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:51:49,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:51:49,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:51:49,276 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:51:49,278 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:51:49,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:51:49,282 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:51:49,283 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:51:49,287 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:51:49,303 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 00:51:49,324 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:51:49,325 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:51:49,327 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:51:49,327 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:51:49,327 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:51:49,328 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:51:49,328 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:51:49,328 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:51:49,329 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:51:49,329 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:51:49,329 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:51:49,329 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:51:49,329 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:51:49,330 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:51:49,330 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:51:49,330 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:51:49,330 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:51:49,331 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:51:49,331 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:51:49,331 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:51:49,331 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:51:49,332 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:51:49,332 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:51:49,332 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:51:49,332 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:51:49,333 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:51:49,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:49,333 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:51:49,333 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:51:49,333 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 00:51:49,703 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:51:49,721 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:51:49,726 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:51:49,728 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:51:49,729 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:51:49,730 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 00:51:49,823 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f31ef72f/6a53b49c53694ae7ad345f35f395d251/FLAGa47c4aadd [2020-07-21 00:51:50,493 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:51:50,494 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b5_o10.c [2020-07-21 00:51:50,504 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f31ef72f/6a53b49c53694ae7ad345f35f395d251/FLAGa47c4aadd [2020-07-21 00:51:50,757 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f31ef72f/6a53b49c53694ae7ad345f35f395d251 [2020-07-21 00:51:50,772 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:51:50,775 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:51:50,777 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:51:50,778 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:51:50,783 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:51:50,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:51:50" (1/1) ... [2020-07-21 00:51:50,788 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55185998 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:50, skipping insertion in model container [2020-07-21 00:51:50,789 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:51:50" (1/1) ... [2020-07-21 00:51:50,798 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:51:50,817 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:51:51,024 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:51:51,031 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:51:51,056 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:51:51,077 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:51:51,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51 WrapperNode [2020-07-21 00:51:51,078 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:51:51,080 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:51:51,080 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:51:51,080 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:51:51,096 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,097 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,103 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,104 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,109 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,113 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,114 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (1/1) ... [2020-07-21 00:51:51,117 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:51:51,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:51:51,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:51:51,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:51:51,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (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 00:51:51,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:51:51,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:51:51,314 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 00:51:51,315 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 00:51:51,315 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:51:51,315 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 00:51:51,315 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:51:51,316 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 00:51:51,316 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 00:51:51,316 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:51:51,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:51:51,316 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:51:51,570 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:51:51,571 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:51:51,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:51:51 BoogieIcfgContainer [2020-07-21 00:51:51,577 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:51:51,579 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:51:51,579 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:51:51,585 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:51:51,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:51:50" (1/3) ... [2020-07-21 00:51:51,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592344a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:51:51, skipping insertion in model container [2020-07-21 00:51:51,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:51:51" (2/3) ... [2020-07-21 00:51:51,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@592344a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:51:51, skipping insertion in model container [2020-07-21 00:51:51,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:51:51" (3/3) ... [2020-07-21 00:51:51,592 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b5_o10.c [2020-07-21 00:51:51,609 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:51:51,623 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:51:51,647 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:51:51,698 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:51:51,699 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:51:51,699 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:51:51,699 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:51:51,699 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:51:51,700 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:51:51,700 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:51:51,700 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:51:51,739 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 00:51:51,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:51:51,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:51,755 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:51:51,756 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:51,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:51,768 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-21 00:51:51,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:51,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131154359] [2020-07-21 00:51:51,785 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 00:51:51,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:51,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:51,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:51,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:52,013 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 00:51:52,014 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:52,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131154359] [2020-07-21 00:51:52,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:52,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:52,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413221543] [2020-07-21 00:51:52,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:52,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:52,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:52,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:52,048 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-21 00:51:52,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:52,128 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 00:51:52,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:52,131 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:51:52,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:52,145 INFO L225 Difference]: With dead ends: 40 [2020-07-21 00:51:52,145 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 00:51:52,151 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 00:51:52,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 00:51:52,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 00:51:52,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:51:52,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-21 00:51:52,213 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-21 00:51:52,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:52,214 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-21 00:51:52,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:52,215 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-21 00:51:52,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:51:52,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:52,218 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 00:51:52,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:52,435 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:52,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:52,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-21 00:51:52,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:52,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218292928] [2020-07-21 00:51:52,438 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 00:51:52,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:52,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:52,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:52,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:52,560 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 00:51:52,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:52,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218292928] [2020-07-21 00:51:52,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:52,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:52,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935496948] [2020-07-21 00:51:52,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:52,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:52,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:52,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:52,570 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-21 00:51:52,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:52,638 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 00:51:52,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:52,641 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 00:51:52,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:52,643 INFO L225 Difference]: With dead ends: 44 [2020-07-21 00:51:52,643 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:51:52,647 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 00:51:52,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:51:52,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:51:52,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:51:52,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 00:51:52,677 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 00:51:52,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:52,678 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 00:51:52,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:52,679 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 00:51:52,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 00:51:52,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:52,683 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 00:51:52,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:52,900 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:52,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:52,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-21 00:51:52,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:52,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517527109] [2020-07-21 00:51:52,903 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 00:51:52,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:52,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:52,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 00:51:52,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:53,024 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 00:51:53,025 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:53,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517527109] [2020-07-21 00:51:53,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:53,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 00:51:53,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391811006] [2020-07-21 00:51:53,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 00:51:53,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:53,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 00:51:53,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 00:51:53,028 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-21 00:51:53,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:53,092 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 00:51:53,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:51:53,093 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-21 00:51:53,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:53,094 INFO L225 Difference]: With dead ends: 36 [2020-07-21 00:51:53,094 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 00:51:53,095 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 00:51:53,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 00:51:53,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 00:51:53,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:51:53,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-21 00:51:53,103 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-21 00:51:53,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:53,103 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-21 00:51:53,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 00:51:53,104 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-21 00:51:53,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:53,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:53,105 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 00:51:53,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:53,319 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:53,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:53,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-21 00:51:53,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:53,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331326246] [2020-07-21 00:51:53,321 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 00:51:53,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:51:53,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:53,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:53,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:53,386 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 00:51:53,387 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:53,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331326246] [2020-07-21 00:51:53,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:53,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:53,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046588413] [2020-07-21 00:51:53,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:53,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:53,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:53,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:53,390 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-21 00:51:53,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:53,416 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-21 00:51:53,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:53,418 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 00:51:53,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:53,419 INFO L225 Difference]: With dead ends: 48 [2020-07-21 00:51:53,419 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 00:51:53,420 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 00:51:53,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 00:51:53,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 00:51:53,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 00:51:53,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 00:51:53,428 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 00:51:53,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:53,428 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 00:51:53,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:53,428 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 00:51:53,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:53,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:53,430 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 00:51:53,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:53,632 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:53,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:53,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-21 00:51:53,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:53,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057720938] [2020-07-21 00:51:53,636 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 00:51:53,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:53,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:53,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 00:51:53,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:53,728 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 00:51:53,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:51:53,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057720938] [2020-07-21 00:51:53,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:51:53,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:51:53,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039161818] [2020-07-21 00:51:53,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:51:53,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:53,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:51:53,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:51:53,736 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 5 states. [2020-07-21 00:51:53,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:53,768 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2020-07-21 00:51:53,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:51:53,770 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-21 00:51:53,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:53,773 INFO L225 Difference]: With dead ends: 40 [2020-07-21 00:51:53,773 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 00:51:53,775 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 00:51:53,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 00:51:53,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-21 00:51:53,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 00:51:53,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-21 00:51:53,789 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-21 00:51:53,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:53,790 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-21 00:51:53,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:51:53,790 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-21 00:51:53,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:51:53,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:51:53,792 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 00:51:54,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:54,008 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:51:54,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:51:54,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-21 00:51:54,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:51:54,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133000161] [2020-07-21 00:51:54,011 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 00:51:54,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:51:54,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:51:54,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 00:51:54,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:51:54,185 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 00:51:54,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:51:54,641 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 00:51:54,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133000161] [2020-07-21 00:51:54,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:51:54,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-21 00:51:54,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880664357] [2020-07-21 00:51:54,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 00:51:54,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:51:54,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 00:51:54,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=332, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:51:54,645 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 20 states. [2020-07-21 00:51:54,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:51:54,928 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-21 00:51:54,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 00:51:54,929 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-07-21 00:51:54,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:51:54,930 INFO L225 Difference]: With dead ends: 54 [2020-07-21 00:51:54,930 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 00:51:54,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2020-07-21 00:51:54,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 00:51:54,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 00:51:54,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 00:51:54,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 00:51:54,934 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-21 00:51:54,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:51:54,934 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 00:51:54,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 00:51:54,934 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 00:51:54,934 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 00:51:55,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:51:55,139 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 00:51:55,208 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 00:51:55,208 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:51:55,209 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 00:51:55,209 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-21 00:51:55,209 INFO L268 CegarLoopResult]: For program point L15(line 15) no Hoare annotation was computed. [2020-07-21 00:51:55,209 INFO L268 CegarLoopResult]: For program point L16-1(line 16) no Hoare annotation was computed. [2020-07-21 00:51:55,209 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 14 19) no Hoare annotation was computed. [2020-07-21 00:51:55,210 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 14 19) the Hoare annotation is: true [2020-07-21 00:51:55,210 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 14 19) no Hoare annotation was computed. [2020-07-21 00:51:55,210 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:51:55,210 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 00:51:55,210 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 00:51:55,211 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 00:51:55,211 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 25) no Hoare annotation was computed. [2020-07-21 00:51:55,211 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 21 27) the Hoare annotation is: true [2020-07-21 00:51:55,211 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-21 00:51:55,211 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 21 27) no Hoare annotation was computed. [2020-07-21 00:51:55,212 INFO L268 CegarLoopResult]: For program point L24(lines 24 26) no Hoare annotation was computed. [2020-07-21 00:51:55,212 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-21 00:51:55,212 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 00:51:55,212 INFO L268 CegarLoopResult]: For program point L24-2(lines 21 27) no Hoare annotation was computed. [2020-07-21 00:51:55,212 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 12) no Hoare annotation was computed. [2020-07-21 00:51:55,212 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 12) no Hoare annotation was computed. [2020-07-21 00:51:55,213 INFO L268 CegarLoopResult]: For program point L10(line 10) no Hoare annotation was computed. [2020-07-21 00:51:55,213 INFO L271 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: true [2020-07-21 00:51:55,213 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 00:51:55,213 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 00:51:55,213 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 12) the Hoare annotation is: true [2020-07-21 00:51:55,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:51:55 BoogieIcfgContainer [2020-07-21 00:51:55,222 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:51:55,227 INFO L168 Benchmark]: Toolchain (without parser) took 4450.93 ms. Allocated memory was 135.3 MB in the beginning and 226.5 MB in the end (delta: 91.2 MB). Free memory was 100.7 MB in the beginning and 112.5 MB in the end (delta: -11.8 MB). Peak memory consumption was 79.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,228 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 135.3 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,229 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.85 ms. Allocated memory is still 135.3 MB. Free memory was 100.2 MB in the beginning and 90.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,230 INFO L168 Benchmark]: Boogie Preprocessor took 37.44 ms. Allocated memory is still 135.3 MB. Free memory was 90.6 MB in the beginning and 89.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,231 INFO L168 Benchmark]: RCFGBuilder took 459.64 ms. Allocated memory was 135.3 MB in the beginning and 199.8 MB in the end (delta: 64.5 MB). Free memory was 89.3 MB in the beginning and 166.7 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,233 INFO L168 Benchmark]: TraceAbstraction took 3643.62 ms. Allocated memory was 199.8 MB in the beginning and 226.5 MB in the end (delta: 26.7 MB). Free memory was 166.0 MB in the beginning and 112.5 MB in the end (delta: 53.5 MB). Peak memory consumption was 80.2 MB. Max. memory is 7.1 GB. [2020-07-21 00:51:55,237 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 135.3 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 301.85 ms. Allocated memory is still 135.3 MB. Free memory was 100.2 MB in the beginning and 90.6 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 37.44 ms. Allocated memory is still 135.3 MB. Free memory was 90.6 MB in the beginning and 89.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 459.64 ms. Allocated memory was 135.3 MB in the beginning and 199.8 MB in the end (delta: 64.5 MB). Free memory was 89.3 MB in the beginning and 166.7 MB in the end (delta: -77.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3643.62 ms. Allocated memory was 199.8 MB in the beginning and 226.5 MB in the end (delta: 26.7 MB). Free memory was 166.0 MB in the beginning and 112.5 MB in the end (delta: 53.5 MB). Peak memory consumption was 80.2 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: 3.4s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 166 SDtfs, 18 SDslu, 797 SDs, 0 SdLazy, 199 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 160 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 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: 0.1s 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...