/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 10:55:24,007 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 10:55:24,010 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 10:55:24,033 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 10:55:24,034 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 10:55:24,036 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 10:55:24,038 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 10:55:24,054 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 10:55:24,056 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 10:55:24,058 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 10:55:24,059 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 10:55:24,060 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 10:55:24,060 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 10:55:24,062 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 10:55:24,063 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 10:55:24,064 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 10:55:24,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 10:55:24,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 10:55:24,068 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 10:55:24,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 10:55:24,071 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 10:55:24,072 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 10:55:24,073 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 10:55:24,074 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 10:55:24,077 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 10:55:24,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 10:55:24,086 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 10:55:24,087 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 10:55:24,088 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 10:55:24,105 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 10:55:24,105 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 10:55:24,107 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 10:55:24,107 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 10:55:24,107 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 10:55:24,107 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 10:55:24,108 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 10:55:24,108 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 10:55:24,108 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 10:55:24,108 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 10:55:24,108 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 10:55:24,109 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 10:55:24,109 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 10:55:24,109 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 10:55:24,109 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 10:55:24,109 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 10:55:24,110 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 10:55:24,110 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 10:55:24,110 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 10:55:24,110 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 10:55:24,110 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 10:55:24,111 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 10:55:24,111 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 10:55:24,111 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 10:55:24,111 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 10:55:24,112 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 10:55:24,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:24,112 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 10:55:24,112 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 10:55:24,112 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 -> NOT_INCREMENTALLY [2020-07-21 10:55:24,431 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 10:55:24,447 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 10:55:24,452 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 10:55:24,454 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 10:55:24,454 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 10:55:24,455 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-2.c [2020-07-21 10:55:24,545 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c24272449/2cb4552a26094d61b0972f47bf449348/FLAGf644eaaf3 [2020-07-21 10:55:25,121 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 10:55:25,122 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-2.c [2020-07-21 10:55:25,130 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c24272449/2cb4552a26094d61b0972f47bf449348/FLAGf644eaaf3 [2020-07-21 10:55:25,512 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c24272449/2cb4552a26094d61b0972f47bf449348 [2020-07-21 10:55:25,526 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 10:55:25,531 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 10:55:25,532 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 10:55:25,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 10:55:25,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 10:55:25,539 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,542 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a18ba82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25, skipping insertion in model container [2020-07-21 10:55:25,543 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,553 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 10:55:25,578 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 10:55:25,812 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:55:25,818 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 10:55:25,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 10:55:25,856 INFO L208 MainTranslator]: Completed translation [2020-07-21 10:55:25,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25 WrapperNode [2020-07-21 10:55:25,857 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 10:55:25,858 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 10:55:25,858 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 10:55:25,859 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 10:55:25,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,876 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,990 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,996 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:25,999 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:26,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (1/1) ... [2020-07-21 10:55:26,012 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 10:55:26,013 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 10:55:26,014 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 10:55:26,014 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 10:55:26,015 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (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 10:55:26,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 10:55:26,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 10:55:26,087 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 10:55:26,087 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 10:55:26,087 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 10:55:26,087 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 10:55:26,087 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 10:55:26,087 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 10:55:26,087 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 10:55:26,088 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 10:55:26,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 10:55:26,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 10:55:26,367 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 10:55:26,368 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 10:55:26,375 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:55:26 BoogieIcfgContainer [2020-07-21 10:55:26,382 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 10:55:26,384 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 10:55:26,385 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 10:55:26,395 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 10:55:26,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:55:25" (1/3) ... [2020-07-21 10:55:26,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3416d16b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:55:26, skipping insertion in model container [2020-07-21 10:55:26,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:55:25" (2/3) ... [2020-07-21 10:55:26,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3416d16b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:55:26, skipping insertion in model container [2020-07-21 10:55:26,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:55:26" (3/3) ... [2020-07-21 10:55:26,409 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-2.c [2020-07-21 10:55:26,436 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 10:55:26,449 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 10:55:26,461 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 10:55:26,485 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 10:55:26,485 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 10:55:26,485 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 10:55:26,486 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 10:55:26,486 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 10:55:26,486 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 10:55:26,486 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 10:55:26,487 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 10:55:26,506 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 10:55:26,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 10:55:26,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:26,515 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:26,515 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:26,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:26,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 10:55:26,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:26,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874084291] [2020-07-21 10:55:26,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:26,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:26,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:55:26,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:26,730 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 10:55:26,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:55:26,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874084291] [2020-07-21 10:55:26,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:55:26,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:55:26,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630799295] [2020-07-21 10:55:26,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:55:26,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:26,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:55:26,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:55:26,759 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 10:55:26,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:26,900 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 10:55:26,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:55:26,902 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 10:55:26,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:26,915 INFO L225 Difference]: With dead ends: 44 [2020-07-21 10:55:26,916 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 10:55:26,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:55:26,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 10:55:26,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 10:55:26,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:55:26,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:55:26,981 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 10:55:26,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:26,982 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:55:26,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:55:26,983 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:55:26,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 10:55:26,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:26,986 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:27,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,201 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:27,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:27,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 10:55:27,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:27,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841214843] [2020-07-21 10:55:27,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:27,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:27,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 10:55:27,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:27,297 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 10:55:27,297 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:55:27,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841214843] [2020-07-21 10:55:27,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:55:27,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 10:55:27,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861175750] [2020-07-21 10:55:27,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 10:55:27,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:27,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 10:55:27,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 10:55:27,303 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 10:55:27,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:27,382 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 10:55:27,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 10:55:27,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 10:55:27,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:27,385 INFO L225 Difference]: With dead ends: 36 [2020-07-21 10:55:27,385 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 10:55:27,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 10:55:27,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 10:55:27,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 10:55:27,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 10:55:27,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 10:55:27,398 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 10:55:27,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:27,399 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 10:55:27,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 10:55:27,400 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 10:55:27,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 10:55:27,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:27,402 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:27,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:27,617 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:27,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:27,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 10:55:27,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:27,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596412840] [2020-07-21 10:55:27,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:27,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:27,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:55:27,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:27,775 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:55:27,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:55:28,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:28,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:55:28,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596412840] [2020-07-21 10:55:28,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:55:28,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 10:55:28,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468192436] [2020-07-21 10:55:28,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 10:55:28,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:28,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 10:55:28,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:55:28,125 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 9 states. [2020-07-21 10:55:28,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:28,276 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 10:55:28,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:55:28,277 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 10:55:28,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:28,279 INFO L225 Difference]: With dead ends: 41 [2020-07-21 10:55:28,279 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 10:55:28,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:55:28,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 10:55:28,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 10:55:28,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 10:55:28,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 10:55:28,291 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 10:55:28,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:28,292 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 10:55:28,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 10:55:28,292 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 10:55:28,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 10:55:28,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:28,294 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 10:55:28,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:28,509 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:28,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:28,510 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 10:55:28,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:28,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917807531] [2020-07-21 10:55:28,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:28,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:28,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 10:55:28,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:28,615 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 10:55:28,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:55:28,761 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 10:55:28,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917807531] [2020-07-21 10:55:28,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:55:28,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 10:55:28,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033530366] [2020-07-21 10:55:28,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 10:55:28,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:28,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 10:55:28,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:55:28,767 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 10:55:28,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:28,857 INFO L93 Difference]: Finished difference Result 49 states and 66 transitions. [2020-07-21 10:55:28,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 10:55:28,859 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 10:55:28,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:28,862 INFO L225 Difference]: With dead ends: 49 [2020-07-21 10:55:28,865 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 10:55:28,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-07-21 10:55:28,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 10:55:28,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-07-21 10:55:28,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 10:55:28,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2020-07-21 10:55:28,899 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 27 [2020-07-21 10:55:28,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:28,900 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2020-07-21 10:55:28,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 10:55:28,900 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2020-07-21 10:55:28,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 10:55:28,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:28,906 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 10:55:29,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:29,123 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:29,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:29,124 INFO L82 PathProgramCache]: Analyzing trace with hash -1725129826, now seen corresponding path program 1 times [2020-07-21 10:55:29,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:29,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146926634] [2020-07-21 10:55:29,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:29,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:29,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 10:55:29,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 10:55:29,236 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 10:55:29,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146926634] [2020-07-21 10:55:29,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 10:55:29,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 10:55:29,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873976536] [2020-07-21 10:55:29,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 10:55:29,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:29,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 10:55:29,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 10:55:29,241 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand 7 states. [2020-07-21 10:55:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:29,400 INFO L93 Difference]: Finished difference Result 49 states and 66 transitions. [2020-07-21 10:55:29,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 10:55:29,401 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-07-21 10:55:29,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:29,403 INFO L225 Difference]: With dead ends: 49 [2020-07-21 10:55:29,403 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 10:55:29,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 10:55:29,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 10:55:29,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2020-07-21 10:55:29,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 10:55:29,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 49 transitions. [2020-07-21 10:55:29,415 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 49 transitions. Word has length 28 [2020-07-21 10:55:29,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:29,415 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 49 transitions. [2020-07-21 10:55:29,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 10:55:29,415 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 49 transitions. [2020-07-21 10:55:29,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 10:55:29,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 10:55:29,418 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1, 1, 1, 1] [2020-07-21 10:55:29,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:29,627 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 10:55:29,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 10:55:29,628 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 10:55:29,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 10:55:29,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719341259] [2020-07-21 10:55:29,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 10:55:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 10:55:29,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 10:55:29,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 10:55:29,741 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 10:55:29,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 10:55:29,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:29,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 10:55:30,029 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 10:55:30,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719341259] [2020-07-21 10:55:30,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 10:55:30,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 10:55:30,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856496699] [2020-07-21 10:55:30,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 10:55:30,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 10:55:30,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 10:55:30,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 10:55:30,033 INFO L87 Difference]: Start difference. First operand 37 states and 49 transitions. Second operand 11 states. [2020-07-21 10:55:30,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 10:55:30,226 INFO L93 Difference]: Finished difference Result 40 states and 53 transitions. [2020-07-21 10:55:30,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 10:55:30,228 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 10:55:30,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 10:55:30,229 INFO L225 Difference]: With dead ends: 40 [2020-07-21 10:55:30,229 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 10:55:30,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2020-07-21 10:55:30,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 10:55:30,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 10:55:30,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 10:55:30,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 10:55:30,232 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 39 [2020-07-21 10:55:30,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 10:55:30,232 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 10:55:30,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 10:55:30,232 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 10:55:30,232 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 10:55:30,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 10:55:30,442 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 10:55:30,686 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 10:55:30,687 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 10:55:30,687 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 10:55:30,687 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 10:55:30,687 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 10:55:30,687 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 10:55:30,688 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 10:55:30,688 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 10:55:30,688 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 10:55:30,688 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 10:55:30,688 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 10:55:30,688 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 10:55:30,689 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 2) (<= 2 main_~x~0)) [2020-07-21 10:55:30,689 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 10:55:30,689 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 10:55:30,689 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 10:55:30,689 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-21 10:55:30,689 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 10:55:30,690 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-21 10:55:30,690 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 10:55:30,690 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 10:55:30,690 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 10:55:30,690 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 10:55:30,690 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 10:55:30,691 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 10:55:30,691 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-21 10:55:30,691 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 10:55:30,691 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse1 (<= fibo1_~n |fibo1_#in~n|)) (.cse0 (<= |fibo1_#in~n| fibo1_~n))) (or (and (or (and (= 1 |fibo1_#t~ret0|) .cse0) (and (<= |fibo1_#in~n| 1) .cse0)) .cse1) (and .cse1 (<= 3 |fibo1_#in~n|) .cse0))) [2020-07-21 10:55:30,692 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 10:55:30,692 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 10:55:30,692 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 10:55:30,692 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 10:55:30,692 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 10:55:30,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:55:30 BoogieIcfgContainer [2020-07-21 10:55:30,701 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 10:55:30,704 INFO L168 Benchmark]: Toolchain (without parser) took 5174.47 ms. Allocated memory was 144.7 MB in the beginning and 249.0 MB in the end (delta: 104.3 MB). Free memory was 102.6 MB in the beginning and 174.7 MB in the end (delta: -72.1 MB). Peak memory consumption was 32.3 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,705 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,706 INFO L168 Benchmark]: CACSL2BoogieTranslator took 325.53 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 92.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,707 INFO L168 Benchmark]: Boogie Preprocessor took 153.60 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 92.7 MB in the beginning and 180.6 MB in the end (delta: -87.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,708 INFO L168 Benchmark]: RCFGBuilder took 369.56 ms. Allocated memory is still 201.9 MB. Free memory was 180.6 MB in the beginning and 167.3 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,709 INFO L168 Benchmark]: TraceAbstraction took 4316.32 ms. Allocated memory was 201.9 MB in the beginning and 249.0 MB in the end (delta: 47.2 MB). Free memory was 166.6 MB in the beginning and 174.7 MB in the end (delta: -8.1 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. [2020-07-21 10:55:30,713 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 325.53 ms. Allocated memory is still 144.7 MB. Free memory was 102.4 MB in the beginning and 92.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 153.60 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 92.7 MB in the beginning and 180.6 MB in the end (delta: -87.9 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 369.56 ms. Allocated memory is still 201.9 MB. Free memory was 180.6 MB in the beginning and 167.3 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4316.32 ms. Allocated memory was 201.9 MB in the beginning and 249.0 MB in the end (delta: 47.2 MB). Free memory was 166.6 MB in the beginning and 174.7 MB in the end (delta: -8.1 MB). Peak memory consumption was 39.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: 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, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3.9s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 170 SDtfs, 95 SDslu, 695 SDs, 0 SdLazy, 399 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 244 GetRequests, 191 SyntacticMatches, 10 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred 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, 18 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 23 PreInvPairs, 29 NumberOfFragments, 70 HoareAnnotationTreeSize, 23 FomulaSimplifications, 47 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 11 FomulaSimplificationsInter, 41 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 147 NumberOfCodeBlocks, 147 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 230 ConstructedInterpolants, 0 QuantifiedInterpolants, 13970 SizeOfPredicates, 13 NumberOfNonLiveVariables, 333 ConjunctsInSsa, 42 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 33/53 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...