/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 07:02:59,573 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:02:59,576 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:02:59,634 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-12-22 07:02:59,667 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:02:59,670 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:02:59,672 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:02:59,675 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:02:59,677 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:02:59,681 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:02:59,707 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:02:59,717 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:02:59,719 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:02:59,721 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:02:59,723 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:02:59,726 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:02:59,735 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:02:59,749 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:02:59,750 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:02:59,751 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:02:59,757 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:02:59,811 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:02:59,811 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:02:59,813 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:02:59,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:02:59,814 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:02:59,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:02:59,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:02:59,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:02:59,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:02:59,815 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:02:59,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:02:59,815 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:02:59,816 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:02:59,816 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:02:59,816 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:02:59,816 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:02:59,817 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:02:59,817 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:02:59,817 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:02:59,817 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:02:59,818 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:02:59,818 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:02:59,818 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:02:59,818 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:02:59,819 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:02:59,819 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:03:00,224 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:03:00,252 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:03:00,255 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:03:00,257 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:03:00,257 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:03:00,258 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_5-2.c [2020-12-22 07:03:00,352 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdaf724/36c144e53edb40e08a3447bed2dd0c9a/FLAG05467313d [2020-12-22 07:03:01,132 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:03:01,133 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c [2020-12-22 07:03:01,141 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdaf724/36c144e53edb40e08a3447bed2dd0c9a/FLAG05467313d [2020-12-22 07:03:01,492 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56bdaf724/36c144e53edb40e08a3447bed2dd0c9a [2020-12-22 07:03:01,495 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:03:01,497 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:03:01,502 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:01,502 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:03:01,509 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:03:01,511 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,512 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4015052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01, skipping insertion in model container [2020-12-22 07:03:01,513 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,523 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:03:01,539 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:03:01,750 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2020-12-22 07:03:01,758 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:01,768 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:03:01,784 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_5-2.c[740,753] [2020-12-22 07:03:01,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:01,801 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:03:01,802 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01 WrapperNode [2020-12-22 07:03:01,802 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:01,803 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:01,803 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:03:01,804 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:03:01,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,821 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,840 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:01,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:03:01,842 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:03:01,842 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:03:01,852 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,852 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,853 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,854 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,860 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,861 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (1/1) ... [2020-12-22 07:03:01,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:03:01,864 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:03:01,864 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:03:01,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:03:01,865 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (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 [2020-12-22 07:03:01,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:03:01,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:03:01,991 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:03:01,991 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:03:01,991 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-12-22 07:03:01,992 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-12-22 07:03:02,386 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:03:02,389 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 07:03:02,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:02 BoogieIcfgContainer [2020-12-22 07:03:02,392 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:03:02,396 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:03:02,399 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:03:02,408 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:03:02,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:03:01" (1/3) ... [2020-12-22 07:03:02,412 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12647552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:02, skipping insertion in model container [2020-12-22 07:03:02,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:01" (2/3) ... [2020-12-22 07:03:02,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12647552 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:02, skipping insertion in model container [2020-12-22 07:03:02,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:02" (3/3) ... [2020-12-22 07:03:02,418 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-12-22 07:03:02,438 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:03:02,449 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:03:02,505 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:03:02,555 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:03:02,555 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:03:02,556 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:03:02,556 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:03:02,556 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:03:02,556 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:03:02,556 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:03:02,556 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:03:02,573 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-22 07:03:02,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 07:03:02,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:02,580 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:02,581 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:02,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:02,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1755511548, now seen corresponding path program 1 times [2020-12-22 07:03:02,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:02,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184854458] [2020-12-22 07:03:02,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:02,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:02,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:02,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:02,936 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184854458] [2020-12-22 07:03:02,937 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:02,938 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:02,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182826483] [2020-12-22 07:03:02,944 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:02,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:02,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:02,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:02,964 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-12-22 07:03:03,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:03,045 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-12-22 07:03:03,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:03,049 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 07:03:03,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:03,058 INFO L225 Difference]: With dead ends: 34 [2020-12-22 07:03:03,059 INFO L226 Difference]: Without dead ends: 18 [2020-12-22 07:03:03,062 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:03,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-22 07:03:03,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-22 07:03:03,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 07:03:03,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-22 07:03:03,109 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-12-22 07:03:03,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:03,110 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-22 07:03:03,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:03,110 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-22 07:03:03,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-22 07:03:03,112 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:03,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:03,113 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:03:03,113 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:03,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:03,114 INFO L82 PathProgramCache]: Analyzing trace with hash 2128459596, now seen corresponding path program 1 times [2020-12-22 07:03:03,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:03,115 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705797899] [2020-12-22 07:03:03,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:03,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:03,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:03,233 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705797899] [2020-12-22 07:03:03,234 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:03,234 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:03,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750850307] [2020-12-22 07:03:03,237 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:03,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:03,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:03,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:03,241 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 5 states. [2020-12-22 07:03:03,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:03,290 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2020-12-22 07:03:03,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:03,291 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-22 07:03:03,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:03,293 INFO L225 Difference]: With dead ends: 24 [2020-12-22 07:03:03,293 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 07:03:03,294 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:03,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 07:03:03,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-12-22 07:03:03,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 07:03:03,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-22 07:03:03,302 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2020-12-22 07:03:03,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:03,303 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-22 07:03:03,303 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:03,303 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-22 07:03:03,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-22 07:03:03,304 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:03,305 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:03,305 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:03:03,305 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:03,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:03,306 INFO L82 PathProgramCache]: Analyzing trace with hash -42544313, now seen corresponding path program 1 times [2020-12-22 07:03:03,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:03,307 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114670131] [2020-12-22 07:03:03,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:03,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:03,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:03,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-12-22 07:03:03,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,522 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 07:03:03,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114670131] [2020-12-22 07:03:03,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981573183] [2020-12-22 07:03:03,523 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:03,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:03,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 07:03:03,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:03,802 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 07:03:03,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:03,803 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-12-22 07:03:03,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202016718] [2020-12-22 07:03:03,804 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 07:03:03,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:03,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 07:03:03,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:03,806 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 9 states. [2020-12-22 07:03:03,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:03,921 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2020-12-22 07:03:03,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:03,922 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-12-22 07:03:03,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:03,924 INFO L225 Difference]: With dead ends: 35 [2020-12-22 07:03:03,924 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 07:03:03,925 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-12-22 07:03:03,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 07:03:03,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-22 07:03:03,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-22 07:03:03,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-22 07:03:03,934 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 23 [2020-12-22 07:03:03,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:03,934 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-22 07:03:03,934 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 07:03:03,935 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-22 07:03:03,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:03,936 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:03,936 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:04,150 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 07:03:04,151 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:04,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:04,152 INFO L82 PathProgramCache]: Analyzing trace with hash 170813287, now seen corresponding path program 1 times [2020-12-22 07:03:04,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:04,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209771273] [2020-12-22 07:03:04,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:04,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:04,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:04,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:04,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,266 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:04,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209771273] [2020-12-22 07:03:04,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383997406] [2020-12-22 07:03:04,268 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:04,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 07:03:04,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:04,406 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:04,407 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:04,407 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-12-22 07:03:04,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832513820] [2020-12-22 07:03:04,408 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:04,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:04,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:04,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:04,409 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 8 states. [2020-12-22 07:03:04,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:04,506 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-12-22 07:03:04,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 07:03:04,506 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-12-22 07:03:04,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:04,509 INFO L225 Difference]: With dead ends: 38 [2020-12-22 07:03:04,509 INFO L226 Difference]: Without dead ends: 34 [2020-12-22 07:03:04,510 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-12-22 07:03:04,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-22 07:03:04,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-22 07:03:04,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-22 07:03:04,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-12-22 07:03:04,522 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 24 [2020-12-22 07:03:04,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:04,522 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-12-22 07:03:04,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:04,522 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-12-22 07:03:04,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-22 07:03:04,525 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:04,525 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:04,739 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:04,740 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:04,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:04,740 INFO L82 PathProgramCache]: Analyzing trace with hash -187634876, now seen corresponding path program 2 times [2020-12-22 07:03:04,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:04,741 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4539530] [2020-12-22 07:03:04,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:04,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:04,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 07:03:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:04,927 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-12-22 07:03:04,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4539530] [2020-12-22 07:03:04,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291324247] [2020-12-22 07:03:04,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:05,001 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 07:03:05,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:05,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 07:03:05,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:05,194 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-12-22 07:03:05,194 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:05,196 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-12-22 07:03:05,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672966874] [2020-12-22 07:03:05,198 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-22 07:03:05,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:05,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-22 07:03:05,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-12-22 07:03:05,201 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 13 states. [2020-12-22 07:03:05,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:05,445 INFO L93 Difference]: Finished difference Result 69 states and 106 transitions. [2020-12-22 07:03:05,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 07:03:05,446 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-12-22 07:03:05,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:05,448 INFO L225 Difference]: With dead ends: 69 [2020-12-22 07:03:05,448 INFO L226 Difference]: Without dead ends: 38 [2020-12-22 07:03:05,449 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2020-12-22 07:03:05,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-22 07:03:05,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-22 07:03:05,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-22 07:03:05,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-12-22 07:03:05,459 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 37 [2020-12-22 07:03:05,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:05,460 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-12-22 07:03:05,460 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-22 07:03:05,460 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-12-22 07:03:05,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-12-22 07:03:05,463 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:05,463 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:05,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:05,677 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:05,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:05,679 INFO L82 PathProgramCache]: Analyzing trace with hash 366248375, now seen corresponding path program 3 times [2020-12-22 07:03:05,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:05,680 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972233702] [2020-12-22 07:03:05,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:05,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:05,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:05,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:05,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:05,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:05,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:05,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:05,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:05,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:06,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 07:03:06,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 07:03:06,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:06,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 07:03:06,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,080 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-12-22 07:03:06,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972233702] [2020-12-22 07:03:06,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448566454] [2020-12-22 07:03:06,081 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:06,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-22 07:03:06,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:06,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 07:03:06,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:06,251 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 41 proven. 82 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-12-22 07:03:06,252 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:06,252 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 12 [2020-12-22 07:03:06,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032136305] [2020-12-22 07:03:06,253 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-22 07:03:06,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:06,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-22 07:03:06,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-12-22 07:03:06,254 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 12 states. [2020-12-22 07:03:06,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:06,393 INFO L93 Difference]: Finished difference Result 80 states and 111 transitions. [2020-12-22 07:03:06,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-22 07:03:06,394 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 79 [2020-12-22 07:03:06,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:06,397 INFO L225 Difference]: With dead ends: 80 [2020-12-22 07:03:06,398 INFO L226 Difference]: Without dead ends: 76 [2020-12-22 07:03:06,399 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-12-22 07:03:06,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-22 07:03:06,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2020-12-22 07:03:06,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-12-22 07:03:06,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 98 transitions. [2020-12-22 07:03:06,415 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 98 transitions. Word has length 79 [2020-12-22 07:03:06,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:06,416 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 98 transitions. [2020-12-22 07:03:06,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-22 07:03:06,416 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 98 transitions. [2020-12-22 07:03:06,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-12-22 07:03:06,420 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:06,420 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:06,634 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:06,634 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:06,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:06,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1447005449, now seen corresponding path program 4 times [2020-12-22 07:03:06,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:06,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334267591] [2020-12-22 07:03:06,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:06,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:06,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:06,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 07:03:06,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 07:03:06,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:06,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-12-22 07:03:06,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:06,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:06,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:07,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:07,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:07,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 07:03:07,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 07:03:07,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 07:03:07,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 07:03:07,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:07,200 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 198 proven. 308 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2020-12-22 07:03:07,201 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334267591] [2020-12-22 07:03:07,201 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016944875] [2020-12-22 07:03:07,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:07,283 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 07:03:07,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:07,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-22 07:03:07,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:07,508 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 108 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-12-22 07:03:07,509 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:07,509 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9] total 22 [2020-12-22 07:03:07,510 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855865197] [2020-12-22 07:03:07,511 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-22 07:03:07,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:07,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-22 07:03:07,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2020-12-22 07:03:07,512 INFO L87 Difference]: Start difference. First operand 70 states and 98 transitions. Second operand 22 states. [2020-12-22 07:03:08,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:08,096 INFO L93 Difference]: Finished difference Result 143 states and 252 transitions. [2020-12-22 07:03:08,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-22 07:03:08,097 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 133 [2020-12-22 07:03:08,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:08,103 INFO L225 Difference]: With dead ends: 143 [2020-12-22 07:03:08,103 INFO L226 Difference]: Without dead ends: 66 [2020-12-22 07:03:08,113 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=266, Invalid=924, Unknown=0, NotChecked=0, Total=1190 [2020-12-22 07:03:08,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-22 07:03:08,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2020-12-22 07:03:08,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-22 07:03:08,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2020-12-22 07:03:08,132 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 133 [2020-12-22 07:03:08,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:08,132 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2020-12-22 07:03:08,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-22 07:03:08,133 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2020-12-22 07:03:08,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-12-22 07:03:08,134 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:08,135 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:08,349 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-22 07:03:08,350 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:08,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:08,351 INFO L82 PathProgramCache]: Analyzing trace with hash -292645265, now seen corresponding path program 5 times [2020-12-22 07:03:08,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:08,352 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666279576] [2020-12-22 07:03:08,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:08,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:08,375 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:08,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 07:03:08,396 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 07:03:08,434 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 07:03:08,435 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 07:03:08,435 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-12-22 07:03:08,527 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 07:03:08 BoogieIcfgContainer [2020-12-22 07:03:08,528 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 07:03:08,528 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 07:03:08,529 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 07:03:08,529 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 07:03:08,529 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:02" (3/4) ... [2020-12-22 07:03:08,532 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 07:03:08,658 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/fibo_5-2.c-witness.graphml [2020-12-22 07:03:08,658 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 07:03:08,660 INFO L168 Benchmark]: Toolchain (without parser) took 7162.90 ms. Allocated memory was 155.2 MB in the beginning and 196.1 MB in the end (delta: 40.9 MB). Free memory was 130.9 MB in the beginning and 103.6 MB in the end (delta: 27.3 MB). Peak memory consumption was 69.2 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,661 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 155.2 MB. Free memory was 128.1 MB in the beginning and 128.0 MB in the end (delta: 80.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:08,661 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.76 ms. Allocated memory is still 155.2 MB. Free memory was 130.7 MB in the beginning and 121.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,662 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.50 ms. Allocated memory is still 155.2 MB. Free memory was 121.5 MB in the beginning and 120.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,665 INFO L168 Benchmark]: Boogie Preprocessor took 21.67 ms. Allocated memory is still 155.2 MB. Free memory was 120.2 MB in the beginning and 119.3 MB in the end (delta: 908.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,666 INFO L168 Benchmark]: RCFGBuilder took 527.85 ms. Allocated memory is still 155.2 MB. Free memory was 119.1 MB in the beginning and 107.6 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,666 INFO L168 Benchmark]: TraceAbstraction took 6132.05 ms. Allocated memory was 155.2 MB in the beginning and 196.1 MB in the end (delta: 40.9 MB). Free memory was 107.1 MB in the beginning and 108.8 MB in the end (delta: -1.7 MB). Peak memory consumption was 39.9 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,667 INFO L168 Benchmark]: Witness Printer took 130.03 ms. Allocated memory is still 196.1 MB. Free memory was 108.8 MB in the beginning and 103.6 MB in the end (delta: 5.2 MB). Peak memory consumption was 5.2 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:08,675 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 155.2 MB. Free memory was 128.1 MB in the beginning and 128.0 MB in the end (delta: 80.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 300.76 ms. Allocated memory is still 155.2 MB. Free memory was 130.7 MB in the beginning and 121.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 37.50 ms. Allocated memory is still 155.2 MB. Free memory was 121.5 MB in the beginning and 120.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.67 ms. Allocated memory is still 155.2 MB. Free memory was 120.2 MB in the beginning and 119.3 MB in the end (delta: 908.4 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 527.85 ms. Allocated memory is still 155.2 MB. Free memory was 119.1 MB in the beginning and 107.6 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6132.05 ms. Allocated memory was 155.2 MB in the beginning and 196.1 MB in the end (delta: 40.9 MB). Free memory was 107.1 MB in the beginning and 108.8 MB in the end (delta: -1.7 MB). Peak memory consumption was 39.9 MB. Max. memory is 8.0 GB. * Witness Printer took 130.03 ms. Allocated memory is still 196.1 MB. Free memory was 108.8 MB in the beginning and 103.6 MB in the end (delta: 5.2 MB). Peak memory consumption was 5.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 29]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L26] int x = 5; [L27] CALL, EXPR fibo(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L13] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L13] return fibo(n-1) + fibo(n-2); [L13] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L13] return fibo(n-1) + fibo(n-2); [L27] RET, EXPR fibo(x) [L27] int result = fibo(x); [L28] COND TRUE result == 5 [L29] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.8s, OverallIterations: 8, TraceHistogramMax: 19, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 133 SDtfs, 255 SDslu, 393 SDs, 0 SdLazy, 679 SolverSat, 286 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 468 GetRequests, 382 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=6, 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, 7 MinimizatonAttempts, 18 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 719 NumberOfCodeBlocks, 689 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 601 ConstructedInterpolants, 0 QuantifiedInterpolants, 98623 SizeOfPredicates, 20 NumberOfNonLiveVariables, 696 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 1928/2602 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 incorrect! Received shutdown request...