/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:26:33,887 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:26:33,891 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:26:33,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 16:26:33,918 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 16:26:33,920 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 16:26:33,921 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 16:26:33,923 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 16:26:33,925 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 16:26:33,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 16:26:33,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 16:26:33,929 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 16:26:33,929 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:26:33,930 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:26:33,931 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:26:33,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:26:33,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:26:33,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:26:33,937 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:26:33,939 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:26:33,941 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:26:33,942 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:26:33,944 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:26:33,945 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:26:33,948 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 16:26:33,971 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:26:33,992 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:26:33,992 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:26:33,995 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:26:33,995 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:26:33,995 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:26:33,995 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:26:33,996 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:26:33,996 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:26:33,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:26:33,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:26:33,997 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:26:33,998 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:26:33,998 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:26:33,998 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:26:33,999 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:26:33,999 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:26:33,999 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:26:34,000 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:26:34,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:26:34,000 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:26:34,000 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:26:34,000 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:26:34,001 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:26:34,493 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:26:34,520 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:26:34,525 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:26:34,528 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:26:34,528 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:26:34,530 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-09-04 16:26:34,628 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4208d2da0/4cb9b89c5efd45d7aa94fbab3870c952/FLAGb104af9c0 [2020-09-04 16:26:35,201 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:26:35,202 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-09-04 16:26:35,211 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4208d2da0/4cb9b89c5efd45d7aa94fbab3870c952/FLAGb104af9c0 [2020-09-04 16:26:35,528 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4208d2da0/4cb9b89c5efd45d7aa94fbab3870c952 [2020-09-04 16:26:35,544 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:26:35,546 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:26:35,548 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:26:35,548 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:26:35,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:26:35,553 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c2dfc77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35, skipping insertion in model container [2020-09-04 16:26:35,557 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:26:35,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:26:35,809 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:26:35,815 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:26:35,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:26:35,851 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:26:35,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35 WrapperNode [2020-09-04 16:26:35,852 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:26:35,852 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:26:35,853 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:26:35,853 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:26:35,867 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,873 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,873 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,956 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (1/1) ... [2020-09-04 16:26:35,963 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:26:35,963 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:26:35,963 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:26:35,963 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:26:35,965 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (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 16:26:36,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:26:36,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:26:36,059 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-09-04 16:26:36,059 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-09-04 16:26:36,059 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:26:36,059 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 16:26:36,059 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:26:36,059 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-09-04 16:26:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-09-04 16:26:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:26:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:26:36,060 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:26:36,317 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:26:36,318 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 16:26:36,325 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:26:36 BoogieIcfgContainer [2020-09-04 16:26:36,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:26:36,343 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:26:36,344 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:26:36,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:26:36,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:26:35" (1/3) ... [2020-09-04 16:26:36,356 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9e95fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:26:36, skipping insertion in model container [2020-09-04 16:26:36,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:26:35" (2/3) ... [2020-09-04 16:26:36,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9e95fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:26:36, skipping insertion in model container [2020-09-04 16:26:36,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:26:36" (3/3) ... [2020-09-04 16:26:36,364 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-09-04 16:26:36,378 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:26:36,389 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:26:36,421 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:26:36,449 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:26:36,449 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:26:36,450 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:26:36,450 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:26:36,450 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:26:36,450 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:26:36,450 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:26:36,451 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:26:36,471 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2020-09-04 16:26:36,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 16:26:36,486 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:36,488 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:36,488 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:36,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:36,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1089710179, now seen corresponding path program 1 times [2020-09-04 16:26:36,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:36,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407194344] [2020-09-04 16:26:36,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:36,583 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:36,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:36,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:36,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:36,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:36,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:36,803 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 16:26:36,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407194344] [2020-09-04 16:26:36,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:36,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:26:36,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471950202] [2020-09-04 16:26:36,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:26:36,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:36,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:26:36,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:26:36,833 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 5 states. [2020-09-04 16:26:36,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:36,989 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2020-09-04 16:26:36,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 16:26:36,991 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-04 16:26:36,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:37,005 INFO L225 Difference]: With dead ends: 58 [2020-09-04 16:26:37,006 INFO L226 Difference]: Without dead ends: 42 [2020-09-04 16:26:37,011 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 16:26:37,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-04 16:26:37,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-04 16:26:37,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:26:37,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-04 16:26:37,075 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 16 [2020-09-04 16:26:37,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:37,076 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-04 16:26:37,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:26:37,076 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-04 16:26:37,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-04 16:26:37,079 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:37,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:37,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:26:37,080 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:37,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:37,081 INFO L82 PathProgramCache]: Analyzing trace with hash -653728005, now seen corresponding path program 1 times [2020-09-04 16:26:37,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:37,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039907623] [2020-09-04 16:26:37,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:37,084 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:37,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:37,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:37,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,163 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 16:26:37,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039907623] [2020-09-04 16:26:37,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:37,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:26:37,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564201823] [2020-09-04 16:26:37,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:26:37,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:37,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:26:37,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:26:37,168 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 5 states. [2020-09-04 16:26:37,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:37,252 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-09-04 16:26:37,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 16:26:37,253 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-04 16:26:37,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:37,255 INFO L225 Difference]: With dead ends: 50 [2020-09-04 16:26:37,256 INFO L226 Difference]: Without dead ends: 44 [2020-09-04 16:26:37,258 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 16:26:37,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-04 16:26:37,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-04 16:26:37,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-04 16:26:37,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2020-09-04 16:26:37,273 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 17 [2020-09-04 16:26:37,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:37,274 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2020-09-04 16:26:37,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:26:37,274 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2020-09-04 16:26:37,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 16:26:37,277 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:37,277 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:37,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:26:37,278 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:37,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:37,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1617834856, now seen corresponding path program 1 times [2020-09-04 16:26:37,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:37,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583832846] [2020-09-04 16:26:37,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:37,282 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:37,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:37,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:37,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:37,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 16:26:37,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,444 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 16:26:37,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583832846] [2020-09-04 16:26:37,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:37,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:26:37,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988210424] [2020-09-04 16:26:37,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:26:37,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:37,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:26:37,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:26:37,447 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 7 states. [2020-09-04 16:26:37,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:37,576 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2020-09-04 16:26:37,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 16:26:37,577 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2020-09-04 16:26:37,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:37,579 INFO L225 Difference]: With dead ends: 82 [2020-09-04 16:26:37,579 INFO L226 Difference]: Without dead ends: 46 [2020-09-04 16:26:37,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:26:37,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-04 16:26:37,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2020-09-04 16:26:37,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-04 16:26:37,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-09-04 16:26:37,598 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2020-09-04 16:26:37,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:37,598 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-09-04 16:26:37,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:26:37,599 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-09-04 16:26:37,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-04 16:26:37,601 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:37,602 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:37,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:26:37,602 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:37,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:37,603 INFO L82 PathProgramCache]: Analyzing trace with hash 887160861, now seen corresponding path program 1 times [2020-09-04 16:26:37,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:37,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299869030] [2020-09-04 16:26:37,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:37,607 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:37,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:37,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:37,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:37,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:37,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:37,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 16:26:37,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299869030] [2020-09-04 16:26:37,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:37,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:26:37,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297253035] [2020-09-04 16:26:37,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:26:37,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:37,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:26:37,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:26:37,877 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand 7 states. [2020-09-04 16:26:38,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:38,137 INFO L93 Difference]: Finished difference Result 74 states and 94 transitions. [2020-09-04 16:26:38,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 16:26:38,138 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-09-04 16:26:38,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:38,142 INFO L225 Difference]: With dead ends: 74 [2020-09-04 16:26:38,142 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 16:26:38,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:26:38,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 16:26:38,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2020-09-04 16:26:38,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-04 16:26:38,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 83 transitions. [2020-09-04 16:26:38,169 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 83 transitions. Word has length 34 [2020-09-04 16:26:38,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:38,170 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 83 transitions. [2020-09-04 16:26:38,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:26:38,170 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 83 transitions. [2020-09-04 16:26:38,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-04 16:26:38,174 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:38,174 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:38,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:26:38,175 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:38,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:38,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1875452576, now seen corresponding path program 1 times [2020-09-04 16:26:38,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:38,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687172277] [2020-09-04 16:26:38,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:38,201 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:38,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:38,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:38,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:38,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-09-04 16:26:38,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-09-04 16:26:38,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,331 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-04 16:26:38,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687172277] [2020-09-04 16:26:38,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:38,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 16:26:38,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463521321] [2020-09-04 16:26:38,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 16:26:38,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:38,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 16:26:38,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:26:38,334 INFO L87 Difference]: Start difference. First operand 66 states and 83 transitions. Second operand 6 states. [2020-09-04 16:26:38,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:38,438 INFO L93 Difference]: Finished difference Result 130 states and 178 transitions. [2020-09-04 16:26:38,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 16:26:38,439 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 50 [2020-09-04 16:26:38,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:38,441 INFO L225 Difference]: With dead ends: 130 [2020-09-04 16:26:38,442 INFO L226 Difference]: Without dead ends: 70 [2020-09-04 16:26:38,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:26:38,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-04 16:26:38,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-09-04 16:26:38,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-09-04 16:26:38,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2020-09-04 16:26:38,461 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 50 [2020-09-04 16:26:38,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:38,462 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2020-09-04 16:26:38,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 16:26:38,462 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2020-09-04 16:26:38,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-04 16:26:38,465 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:38,466 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:38,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 16:26:38,466 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:38,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:38,467 INFO L82 PathProgramCache]: Analyzing trace with hash 104828256, now seen corresponding path program 1 times [2020-09-04 16:26:38,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:38,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410075624] [2020-09-04 16:26:38,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:38,473 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:38,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:38,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:38,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:38,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:38,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:38,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:38,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,618 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 16:26:38,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410075624] [2020-09-04 16:26:38,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:38,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:26:38,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275769535] [2020-09-04 16:26:38,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:26:38,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:38,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:26:38,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:26:38,621 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand 8 states. [2020-09-04 16:26:38,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:38,760 INFO L93 Difference]: Finished difference Result 142 states and 197 transitions. [2020-09-04 16:26:38,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 16:26:38,761 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2020-09-04 16:26:38,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:38,764 INFO L225 Difference]: With dead ends: 142 [2020-09-04 16:26:38,764 INFO L226 Difference]: Without dead ends: 78 [2020-09-04 16:26:38,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-04 16:26:38,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-04 16:26:38,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2020-09-04 16:26:38,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-09-04 16:26:38,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 92 transitions. [2020-09-04 16:26:38,792 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 92 transitions. Word has length 51 [2020-09-04 16:26:38,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:38,796 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 92 transitions. [2020-09-04 16:26:38,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:26:38,797 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 92 transitions. [2020-09-04 16:26:38,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-04 16:26:38,808 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:38,809 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:38,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 16:26:38,809 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:38,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:38,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1703786405, now seen corresponding path program 1 times [2020-09-04 16:26:38,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:38,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360258155] [2020-09-04 16:26:38,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:38,819 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:38,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:38,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:38,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:38,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:38,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:39,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:39,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,087 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-04 16:26:39,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360258155] [2020-09-04 16:26:39,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:39,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:26:39,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984650100] [2020-09-04 16:26:39,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:26:39,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:39,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:26:39,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:26:39,093 INFO L87 Difference]: Start difference. First operand 72 states and 92 transitions. Second operand 8 states. [2020-09-04 16:26:39,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:39,372 INFO L93 Difference]: Finished difference Result 118 states and 158 transitions. [2020-09-04 16:26:39,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 16:26:39,374 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2020-09-04 16:26:39,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:39,378 INFO L225 Difference]: With dead ends: 118 [2020-09-04 16:26:39,378 INFO L226 Difference]: Without dead ends: 112 [2020-09-04 16:26:39,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:26:39,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-04 16:26:39,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2020-09-04 16:26:39,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-09-04 16:26:39,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2020-09-04 16:26:39,446 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 52 [2020-09-04 16:26:39,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:39,446 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2020-09-04 16:26:39,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:26:39,448 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2020-09-04 16:26:39,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-04 16:26:39,457 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:39,457 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:39,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 16:26:39,457 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:39,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:39,458 INFO L82 PathProgramCache]: Analyzing trace with hash -521446491, now seen corresponding path program 1 times [2020-09-04 16:26:39,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:39,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822849389] [2020-09-04 16:26:39,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:39,468 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:39,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:39,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:39,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:39,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:39,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:39,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:39,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-09-04 16:26:39,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,702 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-09-04 16:26:39,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822849389] [2020-09-04 16:26:39,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:39,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:26:39,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296400969] [2020-09-04 16:26:39,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:26:39,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:39,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:26:39,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:26:39,705 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand 8 states. [2020-09-04 16:26:39,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:39,852 INFO L93 Difference]: Finished difference Result 227 states and 348 transitions. [2020-09-04 16:26:39,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 16:26:39,853 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-09-04 16:26:39,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:39,856 INFO L225 Difference]: With dead ends: 227 [2020-09-04 16:26:39,856 INFO L226 Difference]: Without dead ends: 127 [2020-09-04 16:26:39,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-09-04 16:26:39,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-09-04 16:26:39,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 115. [2020-09-04 16:26:39,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-09-04 16:26:39,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 161 transitions. [2020-09-04 16:26:39,884 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 161 transitions. Word has length 69 [2020-09-04 16:26:39,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:39,885 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 161 transitions. [2020-09-04 16:26:39,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:26:39,885 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 161 transitions. [2020-09-04 16:26:39,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-09-04 16:26:39,887 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:39,887 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:39,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 16:26:39,888 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:39,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:39,888 INFO L82 PathProgramCache]: Analyzing trace with hash -439633211, now seen corresponding path program 1 times [2020-09-04 16:26:39,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:39,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087470771] [2020-09-04 16:26:39,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:39,894 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:39,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:39,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:39,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:39,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:39,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:40,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:40,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-09-04 16:26:40,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,124 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-04 16:26:40,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087470771] [2020-09-04 16:26:40,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:40,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 16:26:40,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706732785] [2020-09-04 16:26:40,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 16:26:40,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:40,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 16:26:40,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-04 16:26:40,135 INFO L87 Difference]: Start difference. First operand 115 states and 161 transitions. Second operand 10 states. [2020-09-04 16:26:40,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:40,426 INFO L93 Difference]: Finished difference Result 257 states and 400 transitions. [2020-09-04 16:26:40,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 16:26:40,427 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 70 [2020-09-04 16:26:40,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:40,430 INFO L225 Difference]: With dead ends: 257 [2020-09-04 16:26:40,431 INFO L226 Difference]: Without dead ends: 151 [2020-09-04 16:26:40,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-09-04 16:26:40,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-09-04 16:26:40,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2020-09-04 16:26:40,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-09-04 16:26:40,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 191 transitions. [2020-09-04 16:26:40,459 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 191 transitions. Word has length 70 [2020-09-04 16:26:40,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:40,460 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 191 transitions. [2020-09-04 16:26:40,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 16:26:40,461 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 191 transitions. [2020-09-04 16:26:40,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-09-04 16:26:40,464 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:40,464 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:40,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 16:26:40,465 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:40,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:40,465 INFO L82 PathProgramCache]: Analyzing trace with hash 307755032, now seen corresponding path program 2 times [2020-09-04 16:26:40,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:40,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429465684] [2020-09-04 16:26:40,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:40,473 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:40,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:26:40,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 16:26:40,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:40,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:40,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-09-04 16:26:40,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-04 16:26:40,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 16:26:40,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-09-04 16:26:40,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:26:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 5 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-09-04 16:26:40,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429465684] [2020-09-04 16:26:40,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:26:40,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-09-04 16:26:40,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596740136] [2020-09-04 16:26:40,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 16:26:40,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:26:40,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 16:26:40,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-09-04 16:26:40,785 INFO L87 Difference]: Start difference. First operand 133 states and 191 transitions. Second operand 12 states. [2020-09-04 16:26:41,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:26:41,260 INFO L93 Difference]: Finished difference Result 265 states and 420 transitions. [2020-09-04 16:26:41,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 16:26:41,260 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 105 [2020-09-04 16:26:41,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:26:41,267 INFO L225 Difference]: With dead ends: 265 [2020-09-04 16:26:41,269 INFO L226 Difference]: Without dead ends: 116 [2020-09-04 16:26:41,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-09-04 16:26:41,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-09-04 16:26:41,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 103. [2020-09-04 16:26:41,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-09-04 16:26:41,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 127 transitions. [2020-09-04 16:26:41,313 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 127 transitions. Word has length 105 [2020-09-04 16:26:41,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:26:41,313 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 127 transitions. [2020-09-04 16:26:41,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 16:26:41,314 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 127 transitions. [2020-09-04 16:26:41,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-09-04 16:26:41,319 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:26:41,319 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:26:41,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 16:26:41,320 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:26:41,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:26:41,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1951493560, now seen corresponding path program 1 times [2020-09-04 16:26:41,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:26:41,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439664402] [2020-09-04 16:26:41,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:26:41,329 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:26:41,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:26:41,348 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:26:41,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:26:41,364 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:26:41,404 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 16:26:41,404 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 16:26:41,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 16:26:41,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:26:41 BoogieIcfgContainer [2020-09-04 16:26:41,449 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:26:41,453 INFO L168 Benchmark]: Toolchain (without parser) took 5905.56 ms. Allocated memory was 144.7 MB in the beginning and 297.8 MB in the end (delta: 153.1 MB). Free memory was 102.4 MB in the beginning and 223.2 MB in the end (delta: -120.9 MB). Peak memory consumption was 32.2 MB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,454 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 144.7 MB. Free memory was 120.4 MB in the beginning and 120.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,455 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.66 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 92.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,459 INFO L168 Benchmark]: Boogie Preprocessor took 110.31 ms. Allocated memory was 144.7 MB in the beginning and 200.8 MB in the end (delta: 56.1 MB). Free memory was 92.5 MB in the beginning and 179.5 MB in the end (delta: -87.1 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,463 INFO L168 Benchmark]: RCFGBuilder took 362.69 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 165.2 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,464 INFO L168 Benchmark]: TraceAbstraction took 5105.79 ms. Allocated memory was 200.8 MB in the beginning and 297.8 MB in the end (delta: 97.0 MB). Free memory was 164.2 MB in the beginning and 223.2 MB in the end (delta: -59.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. [2020-09-04 16:26:41,478 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 144.7 MB. Free memory was 120.4 MB in the beginning and 120.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.66 ms. Allocated memory is still 144.7 MB. Free memory was 102.0 MB in the beginning and 92.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 110.31 ms. Allocated memory was 144.7 MB in the beginning and 200.8 MB in the end (delta: 56.1 MB). Free memory was 92.5 MB in the beginning and 179.5 MB in the end (delta: -87.1 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 362.69 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 165.2 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5105.79 ms. Allocated memory was 200.8 MB in the beginning and 297.8 MB in the end (delta: 97.0 MB). Free memory was 164.2 MB in the beginning and 223.2 MB in the end (delta: -59.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND FALSE !(n == 1) [L23] CALL, EXPR fibo1(n-1) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) [L23] CALL, EXPR fibo1(n-2) [L8] COND FALSE !(n < 1) [L10] COND TRUE n == 1 [L11] return 1; [L23] RET, EXPR fibo1(n-2) [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND FALSE !(n < 1) [L20] COND FALSE !(n == 1) [L23] CALL, EXPR fibo1(n-1) [L8] COND FALSE !(n < 1) [L10] COND TRUE n == 1 [L11] return 1; [L23] RET, EXPR fibo1(n-1) [L23] CALL, EXPR fibo1(n-2) [L8] COND TRUE n < 1 [L9] return 0; [L23] RET, EXPR fibo1(n-2) [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 3 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.9s, OverallIterations: 11, TraceHistogramMax: 6, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 436 SDtfs, 418 SDslu, 1642 SDs, 0 SdLazy, 1042 SolverSat, 117 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=133occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 10 MinimizatonAttempts, 61 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...