/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -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 0.1.25-5644d1e-m [2020-08-19 03:33:54,568 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 03:33:54,571 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 03:33:54,596 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 03:33:54,596 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:33:54,597 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:33:54,599 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:33:54,601 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:33:54,602 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:33:54,603 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:33:54,604 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:33:54,605 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:33:54,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:33:54,607 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:33:54,608 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:33:54,609 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:33:54,610 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:33:54,611 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:33:54,612 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:33:54,614 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:33:54,616 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:33:54,617 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:33:54,618 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:33:54,619 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:33:54,622 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 03:33:54,630 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:33:54,631 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:33:54,631 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:33:54,632 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 [2020-08-19 03:33:54,656 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:33:54,656 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:33:54,657 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:33:54,658 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:33:54,658 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:33:54,658 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:33:54,658 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:33:54,659 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:33:54,659 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:33:54,659 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:33:54,659 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:33:54,659 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:33:54,660 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:33:54,660 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:33:54,660 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:33:54,660 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:33:54,660 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:33:54,661 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:33:54,661 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:33:54,661 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:33:54,661 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:33:54,661 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:33:54,662 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:33:54,662 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:33:54,662 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:33:54,662 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:33:54,662 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:33:54,663 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:33:54,663 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:33:54,663 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:33:55,001 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:33:55,021 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:33:55,025 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:33:55,028 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:33:55,029 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:33:55,030 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-19 03:33:55,111 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/86decba7c/a151d33dd3eb4f77a7b6d9131e373d1e/FLAGedf75b694 [2020-08-19 03:33:55,623 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:33:55,624 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-19 03:33:55,633 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/86decba7c/a151d33dd3eb4f77a7b6d9131e373d1e/FLAGedf75b694 [2020-08-19 03:33:56,033 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/86decba7c/a151d33dd3eb4f77a7b6d9131e373d1e [2020-08-19 03:33:56,043 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:33:56,047 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:33:56,051 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:33:56,052 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:33:56,055 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:33:56,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,060 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ee49588 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56, skipping insertion in model container [2020-08-19 03:33:56,060 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,069 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:33:56,088 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:33:56,275 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:33:56,279 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:33:56,296 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:33:56,311 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:33:56,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56 WrapperNode [2020-08-19 03:33:56,312 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:33:56,313 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:33:56,313 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:33:56,313 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:33:56,328 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,328 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,428 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (1/1) ... [2020-08-19 03:33:56,432 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:33:56,433 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:33:56,433 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:33:56,433 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:33:56,434 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (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 [2020-08-19 03:33:56,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:33:56,494 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:33:56,494 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-08-19 03:33:56,494 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:33:56,494 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 03:33:56,495 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:33:56,495 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-08-19 03:33:56,495 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:33:56,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:33:56,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:33:56,667 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:33:56,667 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 03:33:56,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:33:56 BoogieIcfgContainer [2020-08-19 03:33:56,672 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:33:56,673 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:33:56,673 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:33:56,676 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:33:56,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:33:56" (1/3) ... [2020-08-19 03:33:56,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2497f97d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:33:56, skipping insertion in model container [2020-08-19 03:33:56,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:33:56" (2/3) ... [2020-08-19 03:33:56,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2497f97d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:33:56, skipping insertion in model container [2020-08-19 03:33:56,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:33:56" (3/3) ... [2020-08-19 03:33:56,680 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-08-19 03:33:56,691 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:33:56,698 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:33:56,713 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:33:56,737 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:33:56,737 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:33:56,738 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:33:56,738 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:33:56,738 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:33:56,738 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:33:56,738 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:33:56,738 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:33:56,757 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-08-19 03:33:56,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 03:33:56,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:56,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:33:56,765 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:56,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:56,772 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-08-19 03:33:56,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:56,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088732448] [2020-08-19 03:33:56,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:56,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:56,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:56,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:56,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:56,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:56,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:33:56,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088732448] [2020-08-19 03:33:56,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:33:56,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:33:56,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874847285] [2020-08-19 03:33:56,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:33:56,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:57,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:33:57,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:33:57,025 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-08-19 03:33:57,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:57,130 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-19 03:33:57,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:33:57,133 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 03:33:57,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:57,144 INFO L225 Difference]: With dead ends: 35 [2020-08-19 03:33:57,144 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 03:33:57,148 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 [2020-08-19 03:33:57,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 03:33:57,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 03:33:57,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:33:57,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-19 03:33:57,196 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-19 03:33:57,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:57,196 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-19 03:33:57,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:33:57,197 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-19 03:33:57,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 03:33:57,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:57,199 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:33:57,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:33:57,200 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:57,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:57,200 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-08-19 03:33:57,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:57,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231147074] [2020-08-19 03:33:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:57,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:57,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:57,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:33:57,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231147074] [2020-08-19 03:33:57,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:33:57,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 03:33:57,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701526217] [2020-08-19 03:33:57,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:33:57,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:57,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:33:57,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:33:57,275 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-19 03:33:57,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:57,338 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 03:33:57,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:33:57,339 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-19 03:33:57,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:57,340 INFO L225 Difference]: With dead ends: 27 [2020-08-19 03:33:57,340 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 03:33:57,342 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 [2020-08-19 03:33:57,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 03:33:57,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-19 03:33:57,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:33:57,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-19 03:33:57,351 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-19 03:33:57,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:57,351 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-19 03:33:57,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:33:57,352 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-19 03:33:57,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 03:33:57,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:57,353 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] [2020-08-19 03:33:57,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:33:57,354 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:57,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:57,355 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-08-19 03:33:57,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:57,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292033948] [2020-08-19 03:33:57,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:57,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:57,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:57,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:57,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-19 03:33:57,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,507 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-19 03:33:57,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292033948] [2020-08-19 03:33:57,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:57,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:33:57,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224153145] [2020-08-19 03:33:57,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:33:57,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:57,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:33:57,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:33:57,510 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 7 states. [2020-08-19 03:33:57,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:57,634 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-19 03:33:57,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:33:57,635 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-08-19 03:33:57,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:57,637 INFO L225 Difference]: With dead ends: 38 [2020-08-19 03:33:57,637 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 03:33:57,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:33:57,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 03:33:57,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 03:33:57,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 03:33:57,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-19 03:33:57,659 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-19 03:33:57,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:57,659 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-19 03:33:57,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:33:57,660 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-19 03:33:57,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 03:33:57,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:57,666 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] [2020-08-19 03:33:57,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:33:57,667 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:57,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:57,667 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-08-19 03:33:57,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:57,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460026702] [2020-08-19 03:33:57,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:57,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:57,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:57,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:57,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:57,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:57,852 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 03:33:57,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460026702] [2020-08-19 03:33:57,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:57,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:33:57,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275049823] [2020-08-19 03:33:57,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:33:57,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:57,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:33:57,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:33:57,856 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-19 03:33:57,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:57,966 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-19 03:33:57,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:33:57,967 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-19 03:33:57,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:57,970 INFO L225 Difference]: With dead ends: 41 [2020-08-19 03:33:57,970 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 03:33:57,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:33:57,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 03:33:57,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 03:33:57,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:33:57,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-19 03:33:57,995 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-19 03:33:57,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:57,995 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-19 03:33:57,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:33:57,996 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-19 03:33:57,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 03:33:57,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:57,998 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] [2020-08-19 03:33:57,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:33:57,999 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:57,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:57,999 INFO L82 PathProgramCache]: Analyzing trace with hash 146085807, now seen corresponding path program 2 times [2020-08-19 03:33:58,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:58,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397348487] [2020-08-19 03:33:58,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:58,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:58,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:58,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:58,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:58,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,181 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-19 03:33:58,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397348487] [2020-08-19 03:33:58,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:58,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:33:58,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344685482] [2020-08-19 03:33:58,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:33:58,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:58,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:33:58,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:33:58,184 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 8 states. [2020-08-19 03:33:58,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:58,321 INFO L93 Difference]: Finished difference Result 79 states and 124 transitions. [2020-08-19 03:33:58,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:33:58,321 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-19 03:33:58,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:58,324 INFO L225 Difference]: With dead ends: 79 [2020-08-19 03:33:58,324 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 03:33:58,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:33:58,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 03:33:58,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2020-08-19 03:33:58,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 03:33:58,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 57 transitions. [2020-08-19 03:33:58,339 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 57 transitions. Word has length 40 [2020-08-19 03:33:58,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:58,339 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 57 transitions. [2020-08-19 03:33:58,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:33:58,339 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 57 transitions. [2020-08-19 03:33:58,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 03:33:58,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:58,341 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:33:58,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:33:58,342 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:58,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:58,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 3 times [2020-08-19 03:33:58,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:58,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582036774] [2020-08-19 03:33:58,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:58,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:58,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:58,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:58,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,458 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-19 03:33:58,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582036774] [2020-08-19 03:33:58,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:58,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:33:58,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941415235] [2020-08-19 03:33:58,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:33:58,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:58,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:33:58,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:33:58,461 INFO L87 Difference]: Start difference. First operand 42 states and 57 transitions. Second operand 7 states. [2020-08-19 03:33:58,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:58,566 INFO L93 Difference]: Finished difference Result 65 states and 93 transitions. [2020-08-19 03:33:58,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:33:58,567 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-19 03:33:58,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:58,569 INFO L225 Difference]: With dead ends: 65 [2020-08-19 03:33:58,569 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 03:33:58,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:33:58,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 03:33:58,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-19 03:33:58,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 03:33:58,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 84 transitions. [2020-08-19 03:33:58,585 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 84 transitions. Word has length 41 [2020-08-19 03:33:58,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:58,586 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 84 transitions. [2020-08-19 03:33:58,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:33:58,586 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 84 transitions. [2020-08-19 03:33:58,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 03:33:58,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:58,590 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:33:58,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:33:58,591 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:58,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:58,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1986920854, now seen corresponding path program 4 times [2020-08-19 03:33:58,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:58,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334965040] [2020-08-19 03:33:58,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:58,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:58,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:58,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:58,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:58,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 03:33:58,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:58,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:58,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:58,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:58,995 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 77 proven. 104 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-08-19 03:33:58,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334965040] [2020-08-19 03:33:58,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:58,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:33:58,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519618787] [2020-08-19 03:33:58,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:33:58,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:58,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:33:58,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:33:58,998 INFO L87 Difference]: Start difference. First operand 58 states and 84 transitions. Second operand 11 states. [2020-08-19 03:33:59,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:33:59,373 INFO L93 Difference]: Finished difference Result 107 states and 178 transitions. [2020-08-19 03:33:59,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:33:59,373 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 82 [2020-08-19 03:33:59,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:33:59,377 INFO L225 Difference]: With dead ends: 107 [2020-08-19 03:33:59,377 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 03:33:59,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:33:59,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 03:33:59,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-19 03:33:59,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 03:33:59,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 70 transitions. [2020-08-19 03:33:59,391 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 70 transitions. Word has length 82 [2020-08-19 03:33:59,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:33:59,392 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 70 transitions. [2020-08-19 03:33:59,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:33:59,392 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 70 transitions. [2020-08-19 03:33:59,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-08-19 03:33:59,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:33:59,395 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:33:59,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:33:59,396 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:33:59,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:33:59,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-08-19 03:33:59,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:33:59,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490690880] [2020-08-19 03:33:59,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:33:59,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:33:59,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 03:33:59,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:59,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:59,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 03:33:59,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:59,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-19 03:33:59,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:59,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:33:59,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-19 03:33:59,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-19 03:33:59,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:33:59,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:33:59,817 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 193 proven. 313 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2020-08-19 03:33:59,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490690880] [2020-08-19 03:33:59,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:33:59,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:33:59,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462701163] [2020-08-19 03:33:59,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:33:59,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:33:59,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:33:59,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:33:59,820 INFO L87 Difference]: Start difference. First operand 54 states and 70 transitions. Second operand 13 states. [2020-08-19 03:34:00,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:34:00,227 INFO L93 Difference]: Finished difference Result 114 states and 179 transitions. [2020-08-19 03:34:00,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:34:00,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-08-19 03:34:00,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:34:00,230 INFO L225 Difference]: With dead ends: 114 [2020-08-19 03:34:00,230 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 03:34:00,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=154, Invalid=496, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:34:00,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 03:34:00,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2020-08-19 03:34:00,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 03:34:00,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2020-08-19 03:34:00,244 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 136 [2020-08-19 03:34:00,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:34:00,245 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2020-08-19 03:34:00,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:34:00,246 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2020-08-19 03:34:00,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-19 03:34:00,248 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:34:00,248 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] [2020-08-19 03:34:00,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:34:00,249 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:34:00,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:34:00,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-08-19 03:34:00,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:34:00,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490094531] [2020-08-19 03:34:00,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:34:00,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 03:34:00,273 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 03:34:00,274 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 03:34:00,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:34:00,313 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 03:34:00 BoogieIcfgContainer [2020-08-19 03:34:00,314 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 03:34:00,323 INFO L168 Benchmark]: Toolchain (without parser) took 4271.01 ms. Allocated memory was 136.8 MB in the beginning and 253.2 MB in the end (delta: 116.4 MB). Free memory was 100.2 MB in the beginning and 131.4 MB in the end (delta: -31.1 MB). Peak memory consumption was 85.3 MB. Max. memory is 7.1 GB. [2020-08-19 03:34:00,324 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 03:34:00,326 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.89 ms. Allocated memory is still 136.8 MB. Free memory was 100.0 MB in the beginning and 90.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-19 03:34:00,328 INFO L168 Benchmark]: Boogie Preprocessor took 119.37 ms. Allocated memory was 136.8 MB in the beginning and 199.8 MB in the end (delta: 62.9 MB). Free memory was 90.7 MB in the beginning and 178.8 MB in the end (delta: -88.1 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-19 03:34:00,329 INFO L168 Benchmark]: RCFGBuilder took 239.42 ms. Allocated memory is still 199.8 MB. Free memory was 178.8 MB in the beginning and 166.0 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-19 03:34:00,331 INFO L168 Benchmark]: TraceAbstraction took 3640.55 ms. Allocated memory was 199.8 MB in the beginning and 253.2 MB in the end (delta: 53.5 MB). Free memory was 166.0 MB in the beginning and 131.4 MB in the end (delta: 34.6 MB). Peak memory consumption was 88.1 MB. Max. memory is 7.1 GB. [2020-08-19 03:34:00,336 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 260.89 ms. Allocated memory is still 136.8 MB. Free memory was 100.0 MB in the beginning and 90.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.37 ms. Allocated memory was 136.8 MB in the beginning and 199.8 MB in the end (delta: 62.9 MB). Free memory was 90.7 MB in the beginning and 178.8 MB in the end (delta: -88.1 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 239.42 ms. Allocated memory is still 199.8 MB. Free memory was 178.8 MB in the beginning and 166.0 MB in the end (delta: 12.8 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3640.55 ms. Allocated memory was 199.8 MB in the beginning and 253.2 MB in the end (delta: 53.5 MB). Free memory was 166.0 MB in the beginning and 131.4 MB in the end (delta: 34.6 MB). Peak memory consumption was 88.1 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; [L25] CALL, EXPR fibo(x) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) [L25] int result = fibo(x); [L26] COND TRUE result == 5 [L27] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.5s, OverallIterations: 9, TraceHistogramMax: 19, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 157 SDtfs, 240 SDslu, 428 SDs, 0 SdLazy, 609 SolverSat, 186 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 218 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 24 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 488 NumberOfCodeBlocks, 488 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 371 ConstructedInterpolants, 0 QuantifiedInterpolants, 55683 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 894/1351 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...