/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/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-22 06:58:16,102 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 06:58:16,107 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 06:58:16,163 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 06:58:16,164 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 06:58:16,169 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 06:58:16,171 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 06:58:16,178 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 06:58:16,180 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 06:58:16,182 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 06:58:16,183 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 06:58:16,185 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-22 06:58:16,235 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 06:58:16,235 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 06:58:16,239 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 06:58:16,240 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 06:58:16,271 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 06:58:16,272 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 06:58:16,273 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 06:58:16,274 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 06:58:16,274 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 06:58:16,274 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 06:58:16,274 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 06:58:16,275 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 06:58:16,275 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 06:58:16,275 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 06:58:16,275 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 06:58:16,276 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 06:58:16,276 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 06:58:16,276 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 06:58:16,276 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 06:58:16,276 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 06:58:16,277 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 06:58:16,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 06:58:16,277 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 06:58:16,278 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 06:58:16,278 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 06:58:16,278 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 06:58:16,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 06:58:16,278 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 06:58:16,279 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 06:58:16,279 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 06:58:16,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 06:58:16,733 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 06:58:16,736 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 06:58:16,738 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 06:58:16,739 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 06:58:16,740 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/Fibonacci04.c [2020-12-22 06:58:16,822 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cb364ecc/7968827b34674bfc88d23a8df71140a2/FLAG4128c0142 [2020-12-22 06:58:17,384 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 06:58:17,385 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/Fibonacci04.c [2020-12-22 06:58:17,392 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cb364ecc/7968827b34674bfc88d23a8df71140a2/FLAG4128c0142 [2020-12-22 06:58:17,751 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1cb364ecc/7968827b34674bfc88d23a8df71140a2 [2020-12-22 06:58:17,759 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 06:58:17,762 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 06:58:17,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:17,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 06:58:17,771 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 06:58:17,772 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:17" (1/1) ... [2020-12-22 06:58:17,775 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2df19596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:17, skipping insertion in model container [2020-12-22 06:58:17,775 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 06:58:17" (1/1) ... [2020-12-22 06:58:17,784 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 06:58:17,801 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 06:58:18,004 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/Fibonacci04.c[780,793] [2020-12-22 06:58:18,016 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:18,039 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 06:58:18,064 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/Fibonacci04.c[780,793] [2020-12-22 06:58:18,065 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 06:58:18,088 INFO L208 MainTranslator]: Completed translation [2020-12-22 06:58:18,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18 WrapperNode [2020-12-22 06:58:18,089 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 06:58:18,091 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:18,091 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 06:58:18,091 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 06:58:18,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,114 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,136 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 06:58:18,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 06:58:18,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 06:58:18,145 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 06:58:18,157 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,173 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,174 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,182 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,184 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,193 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (1/1) ... [2020-12-22 06:58:18,195 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 06:58:18,197 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 06:58:18,197 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 06:58:18,199 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 06:58:18,200 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (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 06:58:18,332 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-12-22 06:58:18,333 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-12-22 06:58:18,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 06:58:18,333 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 06:58:18,333 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 06:58:18,334 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 06:58:18,719 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 06:58:18,722 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 06:58:18,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:18 BoogieIcfgContainer [2020-12-22 06:58:18,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 06:58:18,732 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 06:58:18,732 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 06:58:18,739 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 06:58:18,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 06:58:17" (1/3) ... [2020-12-22 06:58:18,743 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228943c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:18, skipping insertion in model container [2020-12-22 06:58:18,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 06:58:18" (2/3) ... [2020-12-22 06:58:18,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228943c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 06:58:18, skipping insertion in model container [2020-12-22 06:58:18,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:18" (3/3) ... [2020-12-22 06:58:18,749 INFO L111 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-12-22 06:58:18,767 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 06:58:18,776 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 06:58:18,799 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 06:58:18,828 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 06:58:18,829 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 06:58:18,829 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 06:58:18,829 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 06:58:18,829 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 06:58:18,830 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 06:58:18,830 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 06:58:18,830 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 06:58:18,851 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-12-22 06:58:18,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 06:58:18,858 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:18,872 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:18,873 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:18,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:18,884 INFO L82 PathProgramCache]: Analyzing trace with hash 117289724, now seen corresponding path program 1 times [2020-12-22 06:58:18,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:18,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531721246] [2020-12-22 06:58:18,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:19,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:19,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,243 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 06:58:19,244 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531721246] [2020-12-22 06:58:19,245 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 06:58:19,245 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 06:58:19,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075330938] [2020-12-22 06:58:19,251 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 06:58:19,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:19,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 06:58:19,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 06:58:19,270 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 5 states. [2020-12-22 06:58:19,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:19,360 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-12-22 06:58:19,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 06:58:19,363 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 06:58:19,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:19,373 INFO L225 Difference]: With dead ends: 31 [2020-12-22 06:58:19,374 INFO L226 Difference]: Without dead ends: 18 [2020-12-22 06:58:19,377 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-22 06:58:19,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-22 06:58:19,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-22 06:58:19,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 06:58:19,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-22 06:58:19,429 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2020-12-22 06:58:19,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:19,430 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-22 06:58:19,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 06:58:19,430 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-22 06:58:19,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-22 06:58:19,432 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:19,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:19,432 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 06:58:19,433 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:19,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:19,437 INFO L82 PathProgramCache]: Analyzing trace with hash 36927066, now seen corresponding path program 1 times [2020-12-22 06:58:19,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:19,437 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906960608] [2020-12-22 06:58:19,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:19,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:19,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,505 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 06:58:19,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906960608] [2020-12-22 06:58:19,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 06:58:19,506 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 06:58:19,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575584364] [2020-12-22 06:58:19,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 06:58:19,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:19,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 06:58:19,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 06:58:19,509 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 5 states. [2020-12-22 06:58:19,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:19,564 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2020-12-22 06:58:19,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 06:58:19,565 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-22 06:58:19,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:19,566 INFO L225 Difference]: With dead ends: 24 [2020-12-22 06:58:19,567 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 06:58:19,568 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-22 06:58:19,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 06:58:19,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2020-12-22 06:58:19,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 06:58:19,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-22 06:58:19,576 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2020-12-22 06:58:19,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:19,577 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-22 06:58:19,577 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 06:58:19,577 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-22 06:58:19,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-22 06:58:19,579 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:19,579 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 06:58:19,579 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 06:58:19,579 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:19,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:19,580 INFO L82 PathProgramCache]: Analyzing trace with hash 703243533, now seen corresponding path program 1 times [2020-12-22 06:58:19,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:19,581 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426147048] [2020-12-22 06:58:19,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:19,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:19,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:19,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-12-22 06:58:19,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,700 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 06:58:19,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426147048] [2020-12-22 06:58:19,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211750054] [2020-12-22 06:58:19,701 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 06:58:19,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:19,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 06:58:19,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:19,908 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 06:58:19,909 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:19,909 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-12-22 06:58:19,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960459266] [2020-12-22 06:58:19,911 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 06:58:19,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:19,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 06:58:19,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-12-22 06:58:19,913 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 9 states. [2020-12-22 06:58:20,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:20,037 INFO L93 Difference]: Finished difference Result 35 states and 46 transitions. [2020-12-22 06:58:20,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 06:58:20,038 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-12-22 06:58:20,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:20,040 INFO L225 Difference]: With dead ends: 35 [2020-12-22 06:58:20,040 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 06:58:20,041 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-12-22 06:58:20,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 06:58:20,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-22 06:58:20,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-22 06:58:20,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-22 06:58:20,050 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 23 [2020-12-22 06:58:20,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:20,051 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-22 06:58:20,051 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 06:58:20,051 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-22 06:58:20,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 06:58:20,053 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:20,053 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 06:58:20,268 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 06:58:20,269 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:20,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:20,271 INFO L82 PathProgramCache]: Analyzing trace with hash 187716987, now seen corresponding path program 1 times [2020-12-22 06:58:20,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:20,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820307742] [2020-12-22 06:58:20,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:20,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:20,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:20,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:20,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,411 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 06:58:20,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820307742] [2020-12-22 06:58:20,412 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1476244579] [2020-12-22 06:58:20,412 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 06:58:20,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 06:58:20,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:20,521 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 06:58:20,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:20,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2020-12-22 06:58:20,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53715791] [2020-12-22 06:58:20,523 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 06:58:20,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:20,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 06:58:20,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-22 06:58:20,524 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 9 states. [2020-12-22 06:58:20,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:20,625 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-12-22 06:58:20,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 06:58:20,626 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-12-22 06:58:20,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:20,628 INFO L225 Difference]: With dead ends: 38 [2020-12-22 06:58:20,628 INFO L226 Difference]: Without dead ends: 34 [2020-12-22 06:58:20,629 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-12-22 06:58:20,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-22 06:58:20,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-22 06:58:20,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-22 06:58:20,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-12-22 06:58:20,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 24 [2020-12-22 06:58:20,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:20,640 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-12-22 06:58:20,640 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 06:58:20,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-12-22 06:58:20,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-22 06:58:20,643 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:20,643 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 06:58:20,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:20,857 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:20,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:20,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1151618030, now seen corresponding path program 2 times [2020-12-22 06:58:20,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:20,860 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123010558] [2020-12-22 06:58:20,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:20,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:20,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:20,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:20,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:20,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:20,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:21,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:21,021 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 06:58:21,022 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123010558] [2020-12-22 06:58:21,022 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50854930] [2020-12-22 06:58:21,022 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 06:58:21,072 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 06:58:21,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:21,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 06:58:21,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:21,270 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 06:58:21,271 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:21,272 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-12-22 06:58:21,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734188307] [2020-12-22 06:58:21,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-22 06:58:21,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:21,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-22 06:58:21,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-12-22 06:58:21,276 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 13 states. [2020-12-22 06:58:21,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:21,555 INFO L93 Difference]: Finished difference Result 68 states and 103 transitions. [2020-12-22 06:58:21,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-22 06:58:21,556 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-12-22 06:58:21,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:21,558 INFO L225 Difference]: With dead ends: 68 [2020-12-22 06:58:21,558 INFO L226 Difference]: Without dead ends: 35 [2020-12-22 06:58:21,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2020-12-22 06:58:21,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-22 06:58:21,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-12-22 06:58:21,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-22 06:58:21,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-12-22 06:58:21,568 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 37 [2020-12-22 06:58:21,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:21,569 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-12-22 06:58:21,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-22 06:58:21,569 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-12-22 06:58:21,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-12-22 06:58:21,572 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:21,573 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 06:58:21,787 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:21,788 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:21,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:21,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1375066668, now seen corresponding path program 3 times [2020-12-22 06:58:21,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:21,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288260682] [2020-12-22 06:58:21,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:21,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:21,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:21,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:21,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:21,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:22,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:22,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:22,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 06:58:22,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:22,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:22,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:22,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:22,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 06:58:22,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:22,216 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-12-22 06:58:22,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288260682] [2020-12-22 06:58:22,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047991282] [2020-12-22 06:58:22,217 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 06:58:22,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2020-12-22 06:58:22,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:22,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 06:58:22,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 174 proven. 17 refuted. 0 times theorem prover too weak. 236 trivial. 0 not checked. [2020-12-22 06:58:22,511 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:22,511 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 16 [2020-12-22 06:58:22,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978796243] [2020-12-22 06:58:22,514 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-22 06:58:22,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:22,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-22 06:58:22,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2020-12-22 06:58:22,516 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 16 states. [2020-12-22 06:58:22,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:22,873 INFO L93 Difference]: Finished difference Result 83 states and 118 transitions. [2020-12-22 06:58:22,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 06:58:22,873 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 93 [2020-12-22 06:58:22,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:22,882 INFO L225 Difference]: With dead ends: 83 [2020-12-22 06:58:22,882 INFO L226 Difference]: Without dead ends: 49 [2020-12-22 06:58:22,888 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-12-22 06:58:22,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-12-22 06:58:22,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-12-22 06:58:22,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-22 06:58:22,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2020-12-22 06:58:22,911 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 93 [2020-12-22 06:58:22,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:22,911 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2020-12-22 06:58:22,912 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-22 06:58:22,912 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2020-12-22 06:58:22,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-12-22 06:58:22,914 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:22,914 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 06:58:23,119 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 06:58:23,120 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:23,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:23,122 INFO L82 PathProgramCache]: Analyzing trace with hash 917554903, now seen corresponding path program 4 times [2020-12-22 06:58:23,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:23,122 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726172749] [2020-12-22 06:58:23,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:23,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 06:58:23,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:23,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:23,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 06:58:23,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:23,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-12-22 06:58:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:23,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-12-22 06:58:23,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-12-22 06:58:23,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-12-22 06:58:23,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-12-22 06:58:23,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 06:58:23,688 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 06:58:23,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726172749] [2020-12-22 06:58:23,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626417445] [2020-12-22 06:58:23,689 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 06:58:23,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 06:58:23,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 06:58:23,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-22 06:58:23,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 06:58:24,061 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 06:58:24,061 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 06:58:24,065 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9] total 23 [2020-12-22 06:58:24,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404997886] [2020-12-22 06:58:24,068 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-22 06:58:24,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 06:58:24,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-22 06:58:24,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2020-12-22 06:58:24,077 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand 23 states. [2020-12-22 06:58:24,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 06:58:24,829 INFO L93 Difference]: Finished difference Result 122 states and 198 transitions. [2020-12-22 06:58:24,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-22 06:58:24,830 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 133 [2020-12-22 06:58:24,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 06:58:24,833 INFO L225 Difference]: With dead ends: 122 [2020-12-22 06:58:24,833 INFO L226 Difference]: Without dead ends: 62 [2020-12-22 06:58:24,836 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=269, Invalid=991, Unknown=0, NotChecked=0, Total=1260 [2020-12-22 06:58:24,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-22 06:58:24,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2020-12-22 06:58:24,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-22 06:58:24,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2020-12-22 06:58:24,848 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 133 [2020-12-22 06:58:24,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 06:58:24,848 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2020-12-22 06:58:24,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-22 06:58:24,849 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2020-12-22 06:58:24,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-12-22 06:58:24,851 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 06:58:24,851 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 06:58:25,065 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-12-22 06:58:25,065 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 06:58:25,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 06:58:25,066 INFO L82 PathProgramCache]: Analyzing trace with hash -2094125593, now seen corresponding path program 5 times [2020-12-22 06:58:25,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 06:58:25,066 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773512766] [2020-12-22 06:58:25,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 06:58:25,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 06:58:25,098 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 06:58:25,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 06:58:25,122 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 06:58:25,168 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 06:58:25,168 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 06:58:25,169 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-12-22 06:58:25,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 06:58:25 BoogieIcfgContainer [2020-12-22 06:58:25,296 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 06:58:25,296 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 06:58:25,296 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 06:58:25,297 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 06:58:25,297 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 06:58:18" (3/4) ... [2020-12-22 06:58:25,300 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-22 06:58:25,427 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive/Fibonacci04.c-witness.graphml [2020-12-22 06:58:25,427 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 06:58:25,430 INFO L168 Benchmark]: Toolchain (without parser) took 7666.47 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 127.4 MB in the beginning and 141.0 MB in the end (delta: -13.6 MB). Peak memory consumption was 54.3 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,430 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 06:58:25,431 INFO L168 Benchmark]: CACSL2BoogieTranslator took 322.30 ms. Allocated memory is still 151.0 MB. Free memory was 127.1 MB in the beginning and 117.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,432 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.67 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 115.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,433 INFO L168 Benchmark]: Boogie Preprocessor took 51.72 ms. Allocated memory is still 151.0 MB. Free memory was 115.8 MB in the beginning and 115.0 MB in the end (delta: 853.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,434 INFO L168 Benchmark]: RCFGBuilder took 530.57 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 103.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,434 INFO L168 Benchmark]: TraceAbstraction took 6563.72 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 102.8 MB in the beginning and 146.8 MB in the end (delta: -44.0 MB). Peak memory consumption was 23.9 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,435 INFO L168 Benchmark]: Witness Printer took 130.73 ms. Allocated memory is still 218.1 MB. Free memory was 146.8 MB in the beginning and 141.0 MB in the end (delta: 5.8 MB). Peak memory consumption was 5.2 MB. Max. memory is 8.0 GB. [2020-12-22 06:58:25,437 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 322.30 ms. Allocated memory is still 151.0 MB. Free memory was 127.1 MB in the beginning and 117.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 51.67 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 115.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 51.72 ms. Allocated memory is still 151.0 MB. Free memory was 115.8 MB in the beginning and 115.0 MB in the end (delta: 853.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 530.57 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 103.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6563.72 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 102.8 MB in the beginning and 146.8 MB in the end (delta: -44.0 MB). Peak memory consumption was 23.9 MB. Max. memory is 8.0 GB. * Witness Printer took 130.73 ms. Allocated memory is still 218.1 MB. Free memory was 146.8 MB in the beginning and 141.0 MB in the end (delta: 5.8 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: 35]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L30] int x = __VERIFIER_nondet_int(); [L31] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L19] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L21] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L19] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L21] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L19] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L21] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L19] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L21] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L24] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L19] COND TRUE n < 1 [L20] return 0; VAL [\old(n)=0, \result=0, n=0] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L24] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L19] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L21] COND TRUE n == 1 [L22] return 1; VAL [\old(n)=1, \result=1, n=1] [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L24] return fibonacci(n-1) + fibonacci(n-2); [L24] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L24] return fibonacci(n-1) + fibonacci(n-2); [L31] RET, EXPR fibonacci(x) [L31] int result = fibonacci(x); [L32] COND FALSE !(x != 5 || result == 3) [L35] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.3s, OverallIterations: 8, TraceHistogramMax: 19, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 275 SDslu, 406 SDs, 0 SdLazy, 858 SolverSat, 319 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 499 GetRequests, 397 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=58occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 9 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 747 NumberOfCodeBlocks, 692 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 629 ConstructedInterpolants, 0 QuantifiedInterpolants, 105925 SizeOfPredicates, 16 NumberOfNonLiveVariables, 685 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 2216/2864 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...