/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 13:20:39,661 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:20:39,667 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:20:39,713 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:20:39,714 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:20:39,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:20:39,726 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:20:39,730 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:20:39,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:20:39,736 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:20:39,737 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:20:39,738 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:20:39,738 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:20:39,741 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:20:39,742 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:20:39,744 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:20:39,745 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:20:39,746 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:20:39,747 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:20:39,749 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:20:39,751 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:20:39,752 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:20:39,753 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:20:39,754 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:20:39,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:20:39,766 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:20:39,767 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:20:39,767 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:20:39,769 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:20:39,797 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:20:39,797 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:20:39,799 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:20:39,799 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:20:39,799 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:20:39,800 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:20:39,800 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:20:39,800 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:20:39,800 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:20:39,800 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:20:39,801 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:20:39,801 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:20:39,801 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:20:39,801 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:20:39,801 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:20:39,802 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:20:39,802 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:20:39,802 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:20:39,802 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:20:39,802 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:20:39,803 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:20:39,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:20:39,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:20:39,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:20:39,804 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:20:39,804 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:20:39,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:20:39,804 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:20:39,804 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:20:39,805 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:20:40,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:20:40,334 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:20:40,342 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:20:40,345 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:20:40,346 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:20:40,347 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-09-04 13:20:40,451 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/96b0313ab/e37163f82fc445349985ff7a3c6fa13f/FLAGec94abc9e [2020-09-04 13:20:41,085 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:20:41,086 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-09-04 13:20:41,096 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/96b0313ab/e37163f82fc445349985ff7a3c6fa13f/FLAGec94abc9e [2020-09-04 13:20:41,419 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/96b0313ab/e37163f82fc445349985ff7a3c6fa13f [2020-09-04 13:20:41,437 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:20:41,439 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:20:41,442 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:20:41,442 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:20:41,447 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:20:41,449 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,454 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4650f40f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41, skipping insertion in model container [2020-09-04 13:20:41,454 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,466 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:20:41,495 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:20:41,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:20:41,722 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:20:41,740 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:20:41,755 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:20:41,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41 WrapperNode [2020-09-04 13:20:41,756 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:20:41,757 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:20:41,757 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:20:41,757 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:20:41,772 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,772 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,779 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,779 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,784 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,788 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... [2020-09-04 13:20:41,789 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:20:41,790 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:20:41,790 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:20:41,790 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:20:41,791 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:41,991 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:20:41,992 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:20:41,992 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-09-04 13:20:41,992 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:20:41,992 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 13:20:41,992 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:20:41,993 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-09-04 13:20:41,993 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:20:41,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:20:41,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:20:42,212 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:20:42,212 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 13:20:42,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:20:42 BoogieIcfgContainer [2020-09-04 13:20:42,218 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:20:42,220 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:20:42,220 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:20:42,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:20:42,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:20:41" (1/3) ... [2020-09-04 13:20:42,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29157806 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:20:42, skipping insertion in model container [2020-09-04 13:20:42,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:20:41" (2/3) ... [2020-09-04 13:20:42,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29157806 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:20:42, skipping insertion in model container [2020-09-04 13:20:42,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:20:42" (3/3) ... [2020-09-04 13:20:42,230 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-09-04 13:20:42,246 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:20:42,260 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:20:42,289 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:20:42,330 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:20:42,331 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:20:42,331 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:20:42,331 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:20:42,331 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:20:42,331 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:20:42,332 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:20:42,332 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:20:42,362 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-09-04 13:20:42,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-04 13:20:42,372 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:42,374 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:42,374 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:42,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:42,384 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-09-04 13:20:42,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:42,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103140905] [2020-09-04 13:20:42,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:42,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:42,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:42,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:20:42,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103140905] [2020-09-04 13:20:42,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:20:42,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:20:42,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734614424] [2020-09-04 13:20:42,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:20:42,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:42,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:20:42,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:20:42,680 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-09-04 13:20:42,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:42,813 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-09-04 13:20:42,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:20:42,815 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-09-04 13:20:42,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:42,827 INFO L225 Difference]: With dead ends: 35 [2020-09-04 13:20:42,827 INFO L226 Difference]: Without dead ends: 21 [2020-09-04 13:20:42,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:20:42,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-04 13:20:42,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-04 13:20:42,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-04 13:20:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-09-04 13:20:42,884 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-09-04 13:20:42,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:42,885 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-09-04 13:20:42,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:20:42,885 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-09-04 13:20:42,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-04 13:20:42,888 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:42,888 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:42,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:20:42,889 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:42,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:42,890 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-09-04 13:20:42,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:42,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43793308] [2020-09-04 13:20:42,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:42,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:42,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:42,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:42,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:20:42,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43793308] [2020-09-04 13:20:42,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:20:42,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:20:42,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833778015] [2020-09-04 13:20:42,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:20:42,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:42,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:20:42,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:20:42,979 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-09-04 13:20:43,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:43,046 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-09-04 13:20:43,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:20:43,047 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-09-04 13:20:43,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:43,049 INFO L225 Difference]: With dead ends: 27 [2020-09-04 13:20:43,049 INFO L226 Difference]: Without dead ends: 23 [2020-09-04 13:20:43,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:20:43,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-04 13:20:43,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-09-04 13:20:43,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-04 13:20:43,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-09-04 13:20:43,060 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-09-04 13:20:43,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:43,060 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-09-04 13:20:43,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:20:43,061 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-09-04 13:20:43,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 13:20:43,062 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:43,063 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:43,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 13:20:43,064 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:43,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:43,064 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-09-04 13:20:43,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:43,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001268996] [2020-09-04 13:20:43,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:43,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:43,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:43,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:43,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-04 13:20:43,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,273 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:20:43,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001268996] [2020-09-04 13:20:43,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409961346] [2020-09-04 13:20:43,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:43,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:20:43,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:20:43,457 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-04 13:20:43,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:20:43,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2020-09-04 13:20:43,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082874379] [2020-09-04 13:20:43,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 13:20:43,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:43,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 13:20:43,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:20:43,461 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-09-04 13:20:43,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:43,594 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-09-04 13:20:43,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:20:43,595 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-04 13:20:43,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:43,596 INFO L225 Difference]: With dead ends: 38 [2020-09-04 13:20:43,597 INFO L226 Difference]: Without dead ends: 23 [2020-09-04 13:20:43,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2020-09-04 13:20:43,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-04 13:20:43,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-09-04 13:20:43,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-04 13:20:43,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-09-04 13:20:43,607 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-09-04 13:20:43,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:43,607 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-09-04 13:20:43,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 13:20:43,608 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-09-04 13:20:43,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-04 13:20:43,609 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:43,610 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:43,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-09-04 13:20:43,821 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:43,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:43,822 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-09-04 13:20:43,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:43,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697415237] [2020-09-04 13:20:43,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:43,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:43,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:43,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:43,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:43,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:43,962 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-04 13:20:43,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697415237] [2020-09-04 13:20:43,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941003846] [2020-09-04 13:20:43,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:43,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:20:44,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:20:44,045 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-04 13:20:44,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:20:44,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-09-04 13:20:44,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729686748] [2020-09-04 13:20:44,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:20:44,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:44,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:20:44,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:20:44,048 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 7 states. [2020-09-04 13:20:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:44,156 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-09-04 13:20:44,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:20:44,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2020-09-04 13:20:44,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:44,159 INFO L225 Difference]: With dead ends: 41 [2020-09-04 13:20:44,160 INFO L226 Difference]: Without dead ends: 37 [2020-09-04 13:20:44,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:20:44,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-04 13:20:44,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-04 13:20:44,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 13:20:44,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-09-04 13:20:44,172 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-09-04 13:20:44,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:44,173 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-09-04 13:20:44,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:20:44,173 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-09-04 13:20:44,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-04 13:20:44,175 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:44,176 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:44,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:20:44,390 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:44,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:44,390 INFO L82 PathProgramCache]: Analyzing trace with hash 146085807, now seen corresponding path program 2 times [2020-09-04 13:20:44,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:44,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889587410] [2020-09-04 13:20:44,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:44,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:44,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:44,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:44,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:44,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:44,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 13:20:44,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:44,573 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-09-04 13:20:44,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889587410] [2020-09-04 13:20:44,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123794964] [2020-09-04 13:20:44,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:44,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:20:44,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:20:44,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-09-04 13:20:44,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:20:44,708 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-09-04 13:20:44,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:20:44,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2020-09-04 13:20:44,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255425251] [2020-09-04 13:20:44,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 13:20:44,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:44,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 13:20:44,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-09-04 13:20:44,712 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 12 states. [2020-09-04 13:20:44,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:44,992 INFO L93 Difference]: Finished difference Result 72 states and 109 transitions. [2020-09-04 13:20:44,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 13:20:44,993 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-09-04 13:20:44,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:44,995 INFO L225 Difference]: With dead ends: 72 [2020-09-04 13:20:44,995 INFO L226 Difference]: Without dead ends: 41 [2020-09-04 13:20:44,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2020-09-04 13:20:44,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-04 13:20:45,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-09-04 13:20:45,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-04 13:20:45,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-09-04 13:20:45,007 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 40 [2020-09-04 13:20:45,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:45,008 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-09-04 13:20:45,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 13:20:45,008 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-09-04 13:20:45,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-04 13:20:45,011 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:45,011 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:45,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:20:45,225 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:45,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:45,226 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 3 times [2020-09-04 13:20:45,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:45,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470895074] [2020-09-04 13:20:45,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:45,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:45,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:45,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:45,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:45,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:45,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 13:20:45,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-04 13:20:45,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:45,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:45,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:45,496 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-09-04 13:20:45,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470895074] [2020-09-04 13:20:45,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768837365] [2020-09-04 13:20:45,500 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:45,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-09-04 13:20:45,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:20:45,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2020-09-04 13:20:45,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:20:45,654 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-09-04 13:20:45,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:20:45,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2020-09-04 13:20:45,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230531731] [2020-09-04 13:20:45,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 13:20:45,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:45,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 13:20:45,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-09-04 13:20:45,657 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 10 states. [2020-09-04 13:20:45,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:45,826 INFO L93 Difference]: Finished difference Result 88 states and 127 transitions. [2020-09-04 13:20:45,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 13:20:45,827 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-09-04 13:20:45,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:45,831 INFO L225 Difference]: With dead ends: 88 [2020-09-04 13:20:45,831 INFO L226 Difference]: Without dead ends: 53 [2020-09-04 13:20:45,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-09-04 13:20:45,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-04 13:20:45,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-09-04 13:20:45,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-04 13:20:45,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2020-09-04 13:20:45,845 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 68 [2020-09-04 13:20:45,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:45,846 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2020-09-04 13:20:45,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 13:20:45,847 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2020-09-04 13:20:45,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-09-04 13:20:45,849 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:45,849 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 14, 8, 8, 8, 8, 8, 8, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:46,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:20:46,065 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:46,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:46,066 INFO L82 PathProgramCache]: Analyzing trace with hash -19418837, now seen corresponding path program 4 times [2020-09-04 13:20:46,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:46,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760861437] [2020-09-04 13:20:46,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:46,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:20:46,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:20:46,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:46,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 13:20:46,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-04 13:20:46,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:46,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-09-04 13:20:46,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 13:20:46,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 13:20:46,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 13:20:46,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-04 13:20:46,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:20:46,569 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 183 proven. 243 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2020-09-04 13:20:46,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760861437] [2020-09-04 13:20:46,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354411731] [2020-09-04 13:20:46,571 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:20:46,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:20:46,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:20:46,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 12 conjunts are in the unsatisfiable core [2020-09-04 13:20:46,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:20:46,817 INFO L134 CoverageAnalysis]: Checked inductivity of 747 backedges. 264 proven. 67 refuted. 0 times theorem prover too weak. 416 trivial. 0 not checked. [2020-09-04 13:20:46,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:20:46,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 16 [2020-09-04 13:20:46,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058064014] [2020-09-04 13:20:46,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 13:20:46,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:20:46,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 13:20:46,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2020-09-04 13:20:46,826 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand 16 states. [2020-09-04 13:20:47,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:20:47,469 INFO L93 Difference]: Finished difference Result 120 states and 210 transitions. [2020-09-04 13:20:47,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-04 13:20:47,470 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 123 [2020-09-04 13:20:47,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:20:47,472 INFO L225 Difference]: With dead ends: 120 [2020-09-04 13:20:47,472 INFO L226 Difference]: Without dead ends: 66 [2020-09-04 13:20:47,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=225, Invalid=767, Unknown=0, NotChecked=0, Total=992 [2020-09-04 13:20:47,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-04 13:20:47,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 59. [2020-09-04 13:20:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-04 13:20:47,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2020-09-04 13:20:47,486 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 123 [2020-09-04 13:20:47,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:20:47,487 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2020-09-04 13:20:47,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 13:20:47,487 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2020-09-04 13:20:47,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-09-04 13:20:47,489 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:20:47,489 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:20:47,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-09-04 13:20:47,704 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:20:47,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:20:47,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-09-04 13:20:47,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:20:47,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538696905] [2020-09-04 13:20:47,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:20:47,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:20:47,733 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:20:47,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:20:47,756 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:20:47,788 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:20:47,789 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:20:47,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 13:20:47,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:20:47 BoogieIcfgContainer [2020-09-04 13:20:47,838 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:20:47,842 INFO L168 Benchmark]: Toolchain (without parser) took 6402.17 ms. Allocated memory was 145.8 MB in the beginning and 291.5 MB in the end (delta: 145.8 MB). Free memory was 102.1 MB in the beginning and 233.3 MB in the end (delta: -131.3 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,843 INFO L168 Benchmark]: CDTParser took 1.72 ms. Allocated memory is still 145.8 MB. Free memory was 120.3 MB in the beginning and 119.8 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,843 INFO L168 Benchmark]: CACSL2BoogieTranslator took 314.68 ms. Allocated memory is still 145.8 MB. Free memory was 101.6 MB in the beginning and 92.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,844 INFO L168 Benchmark]: Boogie Preprocessor took 32.39 ms. Allocated memory is still 145.8 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,845 INFO L168 Benchmark]: RCFGBuilder took 427.88 ms. Allocated memory was 145.8 MB in the beginning and 201.9 MB in the end (delta: 56.1 MB). Free memory was 91.2 MB in the beginning and 169.3 MB in the end (delta: -78.1 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,846 INFO L168 Benchmark]: TraceAbstraction took 5618.97 ms. Allocated memory was 201.9 MB in the beginning and 291.5 MB in the end (delta: 89.7 MB). Free memory was 168.3 MB in the beginning and 233.3 MB in the end (delta: -65.1 MB). Peak memory consumption was 24.6 MB. Max. memory is 7.1 GB. [2020-09-04 13:20:47,849 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.72 ms. Allocated memory is still 145.8 MB. Free memory was 120.3 MB in the beginning and 119.8 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 314.68 ms. Allocated memory is still 145.8 MB. Free memory was 101.6 MB in the beginning and 92.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.39 ms. Allocated memory is still 145.8 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 427.88 ms. Allocated memory was 145.8 MB in the beginning and 201.9 MB in the end (delta: 56.1 MB). Free memory was 91.2 MB in the beginning and 169.3 MB in the end (delta: -78.1 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5618.97 ms. Allocated memory was 201.9 MB in the beginning and 291.5 MB in the end (delta: 89.7 MB). Free memory was 168.3 MB in the beginning and 233.3 MB in the end (delta: -65.1 MB). Peak memory consumption was 24.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; VAL [x=5] [L25] CALL, EXPR fibo(x) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=5, x=5] [L25] int result = fibo(x); [L26] COND TRUE result == 5 VAL [result=5, x=5] [L27] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.4s, OverallIterations: 8, TraceHistogramMax: 17, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 138 SDtfs, 219 SDslu, 420 SDs, 0 SdLazy, 669 SolverSat, 165 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 462 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=59occurred 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, 12 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 704 NumberOfCodeBlocks, 664 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 583 ConstructedInterpolants, 0 QuantifiedInterpolants, 79569 SizeOfPredicates, 20 NumberOfNonLiveVariables, 537 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 1547/2016 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...