/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:06:18,385 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 18:06:18,428 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:06:18,438 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:06:18,440 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:06:18,443 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:06:18,446 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:06:18,448 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:06:18,449 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:06:18,452 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:06:18,453 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:06:18,456 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:06:18,458 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:06:18,460 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:06:18,462 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:06:18,464 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:06:18,466 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:06:18,474 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:06:18,477 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:06:18,478 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:06:18,479 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:06:18,479 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:06:18,491 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:06:18,503 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:06:18,505 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:06:18,506 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:06:18,507 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 [2020-08-21 18:06:18,548 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:06:18,548 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:06:18,549 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:06:18,550 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:06:18,550 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:06:18,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:06:18,550 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:06:18,550 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:06:18,551 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:06:18,552 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:06:18,552 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:06:18,552 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:06:18,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:06:18,552 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:06:18,553 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:06:18,553 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:06:18,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:06:18,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:06:18,554 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:06:18,554 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:06:18,554 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:06:18,554 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:06:18,554 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:06:18,555 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:06:18,555 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=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:06:18,877 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:06:18,894 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:06:18,900 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:06:18,903 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:06:18,905 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:06:18,906 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-21 18:06:18,990 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8fc905dfd/2f4ee0c9d1cb45d99ecc3c7a368d1640/FLAG39974b1a7 [2020-08-21 18:06:19,493 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:06:19,494 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-21 18:06:19,501 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8fc905dfd/2f4ee0c9d1cb45d99ecc3c7a368d1640/FLAG39974b1a7 [2020-08-21 18:06:19,925 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8fc905dfd/2f4ee0c9d1cb45d99ecc3c7a368d1640 [2020-08-21 18:06:19,936 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:06:19,938 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:06:19,941 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:06:19,942 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:06:19,946 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:06:19,948 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:06:19" (1/1) ... [2020-08-21 18:06:19,951 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50e64aee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:19, skipping insertion in model container [2020-08-21 18:06:19,951 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:06:19" (1/1) ... [2020-08-21 18:06:19,959 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:06:19,980 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:06:20,182 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:06:20,187 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:06:20,203 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:06:20,216 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:06:20,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20 WrapperNode [2020-08-21 18:06:20,217 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:06:20,218 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:06:20,218 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:06:20,218 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:06:20,229 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,230 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,308 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,309 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,313 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,318 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (1/1) ... [2020-08-21 18:06:20,320 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:06:20,321 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:06:20,321 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:06:20,321 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:06:20,322 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (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 [2020-08-21 18:06:20,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:06:20,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:06:20,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-08-21 18:06:20,395 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:06:20,395 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:06:20,396 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:06:20,396 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-08-21 18:06:20,396 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:06:20,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:06:20,396 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:06:20,605 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:06:20,605 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:06:20,611 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:06:20 BoogieIcfgContainer [2020-08-21 18:06:20,612 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:06:20,613 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:06:20,613 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:06:20,617 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:06:20,617 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:06:19" (1/3) ... [2020-08-21 18:06:20,618 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ac7500 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:06:20, skipping insertion in model container [2020-08-21 18:06:20,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:06:20" (2/3) ... [2020-08-21 18:06:20,618 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64ac7500 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:06:20, skipping insertion in model container [2020-08-21 18:06:20,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:06:20" (3/3) ... [2020-08-21 18:06:20,620 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-08-21 18:06:20,638 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:06:20,646 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:06:20,681 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:06:20,724 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:06:20,725 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:06:20,725 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:06:20,726 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:06:20,726 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:06:20,727 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:06:20,727 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:06:20,727 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:06:20,749 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-21 18:06:20,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 18:06:20,756 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:20,758 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:06:20,758 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:20,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:20,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-08-21 18:06:20,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:20,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022904019] [2020-08-21 18:06:20,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:20,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:20,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:20,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:20,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:20,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:06:21,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022904019] [2020-08-21 18:06:21,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:06:21,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 18:06:21,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989385058] [2020-08-21 18:06:21,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:06:21,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:21,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:06:21,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:06:21,064 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-08-21 18:06:21,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:21,266 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-08-21 18:06:21,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:06:21,269 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-08-21 18:06:21,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:21,281 INFO L225 Difference]: With dead ends: 41 [2020-08-21 18:06:21,281 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 18:06:21,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:06:21,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 18:06:21,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 18:06:21,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:06:21,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-08-21 18:06:21,342 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-08-21 18:06:21,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:21,343 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-08-21 18:06:21,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:06:21,343 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-08-21 18:06:21,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:06:21,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:21,346 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] [2020-08-21 18:06:21,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:06:21,347 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:21,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:21,348 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-08-21 18:06:21,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:21,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713250372] [2020-08-21 18:06:21,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:21,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:21,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:21,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:21,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,513 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:06:21,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713250372] [2020-08-21 18:06:21,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:06:21,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 18:06:21,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430371024] [2020-08-21 18:06:21,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:06:21,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:21,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:06:21,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:06:21,517 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-08-21 18:06:21,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:21,695 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-08-21 18:06:21,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:06:21,696 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-08-21 18:06:21,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:21,698 INFO L225 Difference]: With dead ends: 32 [2020-08-21 18:06:21,698 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:06:21,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:06:21,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:06:21,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-21 18:06:21,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 18:06:21,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-08-21 18:06:21,710 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-08-21 18:06:21,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:21,710 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-08-21 18:06:21,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:06:21,711 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-08-21 18:06:21,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:06:21,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:21,713 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, 1] [2020-08-21 18:06:21,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:06:21,714 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:21,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:21,714 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-08-21 18:06:21,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:21,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130995555] [2020-08-21 18:06:21,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:21,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:21,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:21,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:21,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 18:06:21,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:21,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-21 18:06:21,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130995555] [2020-08-21 18:06:21,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:21,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 18:06:21,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393230734] [2020-08-21 18:06:21,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:06:21,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:21,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:06:21,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:06:21,878 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 5 states. [2020-08-21 18:06:21,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:21,957 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2020-08-21 18:06:21,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:06:21,958 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-21 18:06:21,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:21,960 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:06:21,960 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:06:21,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:06:21,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:06:21,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 18:06:21,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 18:06:21,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-08-21 18:06:21,971 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-08-21 18:06:21,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:21,971 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-08-21 18:06:21,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:06:21,972 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-08-21 18:06:21,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 18:06:21,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:21,974 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 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] [2020-08-21 18:06:21,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:06:21,974 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:21,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:21,975 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-08-21 18:06:21,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:21,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654047453] [2020-08-21 18:06:21,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:22,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:22,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:22,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:22,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 18:06:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,236 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-08-21 18:06:22,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654047453] [2020-08-21 18:06:22,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:22,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:06:22,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926133836] [2020-08-21 18:06:22,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:06:22,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:22,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:06:22,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:06:22,240 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 13 states. [2020-08-21 18:06:22,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:22,744 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-08-21 18:06:22,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:06:22,745 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 18:06:22,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:22,750 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:06:22,750 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 18:06:22,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:06:22,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 18:06:22,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-08-21 18:06:22,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:06:22,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-08-21 18:06:22,768 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-08-21 18:06:22,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:22,769 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-08-21 18:06:22,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:06:22,770 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-08-21 18:06:22,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:06:22,772 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:22,772 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:06:22,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:06:22,773 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:22,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:22,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-08-21 18:06:22,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:22,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169274026] [2020-08-21 18:06:22,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:22,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:22,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:22,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:22,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:22,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 18:06:23,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,095 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-08-21 18:06:23,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169274026] [2020-08-21 18:06:23,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:23,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:06:23,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916732767] [2020-08-21 18:06:23,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:06:23,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:23,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:06:23,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:06:23,098 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 14 states. [2020-08-21 18:06:23,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:23,605 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-08-21 18:06:23,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:06:23,606 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-08-21 18:06:23,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:23,610 INFO L225 Difference]: With dead ends: 65 [2020-08-21 18:06:23,611 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 18:06:23,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:06:23,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 18:06:23,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-08-21 18:06:23,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 18:06:23,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-08-21 18:06:23,643 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-08-21 18:06:23,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:23,644 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-08-21 18:06:23,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:06:23,644 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-08-21 18:06:23,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:06:23,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:23,651 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:06:23,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:06:23,652 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:23,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:23,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-08-21 18:06:23,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:23,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524991814] [2020-08-21 18:06:23,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:23,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:23,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:23,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 18:06:23,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,750 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-21 18:06:23,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524991814] [2020-08-21 18:06:23,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:23,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:06:23,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325499021] [2020-08-21 18:06:23,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:06:23,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:23,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:06:23,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:06:23,753 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 7 states. [2020-08-21 18:06:23,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:23,866 INFO L93 Difference]: Finished difference Result 75 states and 128 transitions. [2020-08-21 18:06:23,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:06:23,867 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2020-08-21 18:06:23,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:23,869 INFO L225 Difference]: With dead ends: 75 [2020-08-21 18:06:23,869 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 18:06:23,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:06:23,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 18:06:23,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 18:06:23,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:06:23,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 74 transitions. [2020-08-21 18:06:23,882 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 74 transitions. Word has length 42 [2020-08-21 18:06:23,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:23,882 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 74 transitions. [2020-08-21 18:06:23,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:06:23,883 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 74 transitions. [2020-08-21 18:06:23,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:06:23,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:23,885 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:06:23,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:06:23,886 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:23,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:23,886 INFO L82 PathProgramCache]: Analyzing trace with hash 579008339, now seen corresponding path program 4 times [2020-08-21 18:06:23,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:23,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [496916558] [2020-08-21 18:06:23,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:23,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:23,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:23,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 18:06:23,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:23,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:23,956 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-08-21 18:06:23,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [496916558] [2020-08-21 18:06:23,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:23,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 18:06:23,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612708733] [2020-08-21 18:06:23,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:06:23,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:23,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:06:23,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:06:23,961 INFO L87 Difference]: Start difference. First operand 49 states and 74 transitions. Second operand 4 states. [2020-08-21 18:06:24,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:24,002 INFO L93 Difference]: Finished difference Result 91 states and 165 transitions. [2020-08-21 18:06:24,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:06:24,003 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 56 [2020-08-21 18:06:24,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:24,005 INFO L225 Difference]: With dead ends: 91 [2020-08-21 18:06:24,005 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 18:06:24,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:06:24,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 18:06:24,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 18:06:24,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 18:06:24,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 76 transitions. [2020-08-21 18:06:24,018 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 76 transitions. Word has length 56 [2020-08-21 18:06:24,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:24,018 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 76 transitions. [2020-08-21 18:06:24,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:06:24,019 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 76 transitions. [2020-08-21 18:06:24,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 18:06:24,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:06:24,021 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:06:24,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:06:24,022 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:06:24,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:06:24,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1732137516, now seen corresponding path program 5 times [2020-08-21 18:06:24,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:06:24,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89465944] [2020-08-21 18:06:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:06:24,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:06:24,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-21 18:06:24,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:24,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:24,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:24,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 18:06:24,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-08-21 18:06:24,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 18:06:24,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:06:24,237 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 29 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-08-21 18:06:24,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89465944] [2020-08-21 18:06:24,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:06:24,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:06:24,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044756109] [2020-08-21 18:06:24,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:06:24,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:06:24,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:06:24,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:06:24,240 INFO L87 Difference]: Start difference. First operand 50 states and 76 transitions. Second operand 14 states. [2020-08-21 18:06:24,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:06:24,815 INFO L93 Difference]: Finished difference Result 95 states and 184 transitions. [2020-08-21 18:06:24,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:06:24,817 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-08-21 18:06:24,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:06:24,818 INFO L225 Difference]: With dead ends: 95 [2020-08-21 18:06:24,818 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 18:06:24,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=219, Invalid=773, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:06:24,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 18:06:24,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 18:06:24,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 18:06:24,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 18:06:24,825 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2020-08-21 18:06:24,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:06:24,825 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 18:06:24,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:06:24,826 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 18:06:24,826 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 18:06:24,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:06:24,831 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 18:06:25,256 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 25 [2020-08-21 18:06:25,306 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 18:06:25,306 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 18:06:25,306 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 18:06:25,307 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 18:06:25,307 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 18:06:25,307 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 18:06:25,307 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-08-21 18:06:25,308 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-21 18:06:25,308 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-08-21 18:06:25,308 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-08-21 18:06:25,308 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= |ackermann_#in~n| 0) (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-21 18:06:25,310 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse3 (<= 3 |ackermann_#t~ret1|))) (and (let ((.cse0 (= ackermann_~n |ackermann_#in~n|)) (.cse1 (<= 1 |ackermann_#in~m|)) (.cse2 (= ackermann_~m |ackermann_#in~m|))) (or (and (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1) .cse0 .cse1 .cse2) (and .cse3 .cse0 .cse1 .cse2))) (or (= |ackermann_#in~n| 1) .cse3 (and (<= 2 |ackermann_#res|) (<= (+ |ackermann_#in~n| 1) |ackermann_#res|))))) [2020-08-21 18:06:25,310 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-08-21 18:06:25,311 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-08-21 18:06:25,311 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-08-21 18:06:25,312 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-08-21 18:06:25,312 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-08-21 18:06:25,312 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-08-21 18:06:25,312 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-08-21 18:06:25,313 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-08-21 18:06:25,313 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-08-21 18:06:25,313 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-08-21 18:06:25,313 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-08-21 18:06:25,313 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-08-21 18:06:25,314 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-08-21 18:06:25,314 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-08-21 18:06:25,314 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-08-21 18:06:25,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:06:25 BoogieIcfgContainer [2020-08-21 18:06:25,338 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:06:25,343 INFO L168 Benchmark]: Toolchain (without parser) took 5404.60 ms. Allocated memory was 140.5 MB in the beginning and 286.8 MB in the end (delta: 146.3 MB). Free memory was 103.3 MB in the beginning and 155.7 MB in the end (delta: -52.5 MB). Peak memory consumption was 93.8 MB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,345 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,346 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.20 ms. Allocated memory is still 140.5 MB. Free memory was 103.3 MB in the beginning and 93.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,349 INFO L168 Benchmark]: Boogie Preprocessor took 102.33 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.5 MB in the beginning and 181.7 MB in the end (delta: -88.2 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,350 INFO L168 Benchmark]: RCFGBuilder took 291.20 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 168.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,351 INFO L168 Benchmark]: TraceAbstraction took 4725.09 ms. Allocated memory was 202.9 MB in the beginning and 286.8 MB in the end (delta: 83.9 MB). Free memory was 168.2 MB in the beginning and 155.7 MB in the end (delta: 12.5 MB). Peak memory consumption was 96.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:06:25,359 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 140.5 MB. Free memory was 122.1 MB in the beginning and 121.6 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 276.20 ms. Allocated memory is still 140.5 MB. Free memory was 103.3 MB in the beginning and 93.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 102.33 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.5 MB in the beginning and 181.7 MB in the end (delta: -88.2 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 291.20 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 168.2 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4725.09 ms. Allocated memory was 202.9 MB in the beginning and 286.8 MB in the end (delta: 83.9 MB). Free memory was 168.2 MB in the beginning and 155.7 MB in the end (delta: 12.5 MB). Peak memory consumption was 96.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 44]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.1s, OverallIterations: 8, TraceHistogramMax: 8, AutomataDifference: 2.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 176 SDtfs, 135 SDslu, 693 SDs, 0 SdLazy, 1254 SolverSat, 210 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 216 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 43 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 125 PreInvPairs, 152 NumberOfFragments, 80 HoareAnnotationTreeSize, 125 FomulaSimplifications, 7084 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 9 FomulaSimplificationsInter, 222 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 302 NumberOfCodeBlocks, 302 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 294 ConstructedInterpolants, 0 QuantifiedInterpolants, 24252 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 294/369 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 correct! Received shutdown request...