/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 false -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-eb0fd7c [2020-09-21 10:17:22,427 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:17:22,436 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:17:22,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:17:22,482 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:17:22,490 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:17:22,494 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:17:22,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:17:22,501 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:17:22,506 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:17:22,507 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:17:22,509 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:17:22,509 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:17:22,512 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:17:22,515 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:17:22,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:17:22,520 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:17:22,521 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:17:22,523 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:17:22,531 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:17:22,534 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:17:22,535 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:17:22,536 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:17:22,537 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:17:22,549 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:17:22,566 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:17:22,567 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:17:22,569 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:17:22,569 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:17:22,597 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:17:22,598 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:17:22,599 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:17:22,599 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:17:22,600 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:17:22,600 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:17:22,600 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:17:22,600 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:17:22,600 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:17:22,601 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:17:22,601 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:17:22,601 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:17:22,601 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:17:22,601 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:17:22,602 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:17:22,602 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:17:22,602 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:17:22,602 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:17:22,602 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:17:22,603 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:17:22,603 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:17:22,603 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:17:22,603 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:17:22,603 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:17:22,604 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:17:22,604 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:17:22,604 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:17:22,604 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:17:22,605 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:17:22,605 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 -> false [2020-09-21 10:17:23,165 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:17:23,182 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:17:23,186 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:17:23,188 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:17:23,188 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:17:23,189 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-09-21 10:17:23,271 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2903279ec/66bb0332465c4b70bab1ec9e13225e40/FLAG2660ba704 [2020-09-21 10:17:23,794 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:17:23,795 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-09-21 10:17:23,804 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2903279ec/66bb0332465c4b70bab1ec9e13225e40/FLAG2660ba704 [2020-09-21 10:17:24,135 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2903279ec/66bb0332465c4b70bab1ec9e13225e40 [2020-09-21 10:17:24,151 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:17:24,158 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:17:24,159 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:17:24,159 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:17:24,163 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:17:24,165 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,169 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@601fc90f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24, skipping insertion in model container [2020-09-21 10:17:24,170 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,179 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:17:24,205 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:17:24,413 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:17:24,419 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:17:24,442 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:17:24,458 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:17:24,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24 WrapperNode [2020-09-21 10:17:24,459 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:17:24,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:17:24,460 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:17:24,460 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:17:24,473 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,474 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,479 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,480 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,484 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,488 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... [2020-09-21 10:17:24,490 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:17:24,490 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:17:24,490 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:17:24,491 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:17:24,492 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:17:24,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:17:24,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:17:24,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-09-21 10:17:24,645 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:17:24,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:17:24,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:17:24,645 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-09-21 10:17:24,645 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:17:24,646 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:17:24,646 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:17:24,864 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:17:24,865 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-21 10:17:24,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:17:24 BoogieIcfgContainer [2020-09-21 10:17:24,870 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:17:24,871 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:17:24,872 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:17:24,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:17:24,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:17:24" (1/3) ... [2020-09-21 10:17:24,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62cf6442 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:17:24, skipping insertion in model container [2020-09-21 10:17:24,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:17:24" (2/3) ... [2020-09-21 10:17:24,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62cf6442 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:17:24, skipping insertion in model container [2020-09-21 10:17:24,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:17:24" (3/3) ... [2020-09-21 10:17:24,881 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-09-21 10:17:24,893 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:17:24,904 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:17:24,930 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:17:24,969 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:17:24,969 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:17:24,970 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:17:24,970 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:17:24,970 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:17:24,970 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:17:24,971 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:17:24,971 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:17:25,002 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-09-21 10:17:25,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:17:25,020 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:25,022 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:17:25,023 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:25,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:25,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-09-21 10:17:25,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:25,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83917377] [2020-09-21 10:17:25,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:25,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:25,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:25,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:17:25,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83917377] [2020-09-21 10:17:25,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:17:25,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-21 10:17:25,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508419845] [2020-09-21 10:17:25,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:17:25,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:25,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:17:25,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:17:25,364 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-09-21 10:17:25,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:25,575 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-09-21 10:17:25,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:17:25,577 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-09-21 10:17:25,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:25,592 INFO L225 Difference]: With dead ends: 41 [2020-09-21 10:17:25,592 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:17:25,597 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 [2020-09-21 10:17:25,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:17:25,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:17:25,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:17:25,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-09-21 10:17:25,653 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-09-21 10:17:25,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:25,653 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-09-21 10:17:25,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:17:25,654 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-09-21 10:17:25,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:17:25,657 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:25,657 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] [2020-09-21 10:17:25,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:17:25,658 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:25,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:25,658 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-09-21 10:17:25,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:25,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346315111] [2020-09-21 10:17:25,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:25,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:25,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:25,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:25,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:25,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:17:25,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346315111] [2020-09-21 10:17:25,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:17:25,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-21 10:17:25,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924319741] [2020-09-21 10:17:25,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:17:25,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:25,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:17:25,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:17:25,835 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-09-21 10:17:26,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:26,030 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-09-21 10:17:26,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:17:26,031 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-09-21 10:17:26,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:26,033 INFO L225 Difference]: With dead ends: 32 [2020-09-21 10:17:26,034 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:17:26,035 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 [2020-09-21 10:17:26,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:17:26,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-09-21 10:17:26,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 10:17:26,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-09-21 10:17:26,046 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-09-21 10:17:26,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:26,046 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-09-21 10:17:26,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:17:26,047 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-09-21 10:17:26,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:17:26,048 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:26,049 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] [2020-09-21 10:17:26,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:17:26,049 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:26,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:26,050 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-09-21 10:17:26,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:26,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21550146] [2020-09-21 10:17:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:26,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:26,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:26,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:26,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:17:26,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,206 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-21 10:17:26,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21550146] [2020-09-21 10:17:26,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:26,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:17:26,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108857692] [2020-09-21 10:17:26,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:17:26,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:26,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:17:26,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:17:26,209 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 5 states. [2020-09-21 10:17:26,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:26,277 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2020-09-21 10:17:26,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:17:26,278 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-09-21 10:17:26,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:26,280 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:17:26,280 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:17:26,281 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 [2020-09-21 10:17:26,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:17:26,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-21 10:17:26,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:17:26,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-09-21 10:17:26,290 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-09-21 10:17:26,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:26,291 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-09-21 10:17:26,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:17:26,291 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-09-21 10:17:26,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-21 10:17:26,293 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:26,294 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] [2020-09-21 10:17:26,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:17:26,294 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:26,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:26,295 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-09-21 10:17:26,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:26,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052917763] [2020-09-21 10:17:26,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:26,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:26,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:26,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:26,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:26,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-21 10:17:26,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:26,547 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-21 10:17:26,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052917763] [2020-09-21 10:17:26,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:26,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:17:26,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415725030] [2020-09-21 10:17:26,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:17:26,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:26,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:17:26,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:17:26,550 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 13 states. [2020-09-21 10:17:27,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:27,087 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-09-21 10:17:27,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:17:27,087 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-09-21 10:17:27,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:27,092 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:17:27,092 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:17:27,093 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 [2020-09-21 10:17:27,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:17:27,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-09-21 10:17:27,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:17:27,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-09-21 10:17:27,110 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-09-21 10:17:27,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:27,111 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-09-21 10:17:27,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:17:27,111 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-09-21 10:17:27,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:17:27,114 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:27,114 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] [2020-09-21 10:17:27,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:17:27,114 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:27,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:27,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-09-21 10:17:27,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:27,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429658106] [2020-09-21 10:17:27,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:27,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:27,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:27,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:27,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:27,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:27,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-21 10:17:27,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,406 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-09-21 10:17:27,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429658106] [2020-09-21 10:17:27,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:27,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:17:27,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165323854] [2020-09-21 10:17:27,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:17:27,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:27,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:17:27,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:17:27,409 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 14 states. [2020-09-21 10:17:27,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:27,916 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-09-21 10:17:27,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:17:27,917 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-09-21 10:17:27,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:27,919 INFO L225 Difference]: With dead ends: 65 [2020-09-21 10:17:27,920 INFO L226 Difference]: Without dead ends: 61 [2020-09-21 10:17:27,921 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 [2020-09-21 10:17:27,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-21 10:17:27,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-09-21 10:17:27,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:17:27,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-09-21 10:17:27,938 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-09-21 10:17:27,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:27,939 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-09-21 10:17:27,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:17:27,939 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-09-21 10:17:27,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:17:27,941 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:27,941 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] [2020-09-21 10:17:27,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:17:27,942 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:27,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:27,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-09-21 10:17:27,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:27,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465946133] [2020-09-21 10:17:27,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:27,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:27,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:27,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:27,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-21 10:17:28,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-09-21 10:17:28,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465946133] [2020-09-21 10:17:28,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:28,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:17:28,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230628765] [2020-09-21 10:17:28,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:17:28,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:28,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:17:28,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:17:28,102 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 7 states. [2020-09-21 10:17:28,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:28,229 INFO L93 Difference]: Finished difference Result 75 states and 128 transitions. [2020-09-21 10:17:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:17:28,230 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2020-09-21 10:17:28,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:28,232 INFO L225 Difference]: With dead ends: 75 [2020-09-21 10:17:28,232 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:17:28,235 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 [2020-09-21 10:17:28,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:17:28,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:17:28,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:17:28,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 74 transitions. [2020-09-21 10:17:28,255 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 74 transitions. Word has length 42 [2020-09-21 10:17:28,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:28,255 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 74 transitions. [2020-09-21 10:17:28,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:17:28,256 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 74 transitions. [2020-09-21 10:17:28,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-21 10:17:28,265 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:28,265 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] [2020-09-21 10:17:28,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:17:28,266 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:28,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:28,266 INFO L82 PathProgramCache]: Analyzing trace with hash 579008339, now seen corresponding path program 4 times [2020-09-21 10:17:28,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:28,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264838785] [2020-09-21 10:17:28,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:28,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:28,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:28,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-21 10:17:28,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,380 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-09-21 10:17:28,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264838785] [2020-09-21 10:17:28,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:28,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 10:17:28,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770618625] [2020-09-21 10:17:28,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:17:28,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:28,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:17:28,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:17:28,383 INFO L87 Difference]: Start difference. First operand 49 states and 74 transitions. Second operand 4 states. [2020-09-21 10:17:28,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:28,438 INFO L93 Difference]: Finished difference Result 91 states and 165 transitions. [2020-09-21 10:17:28,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:17:28,438 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 56 [2020-09-21 10:17:28,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:28,439 INFO L225 Difference]: With dead ends: 91 [2020-09-21 10:17:28,440 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:17:28,441 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 [2020-09-21 10:17:28,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:17:28,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-09-21 10:17:28,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 10:17:28,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 76 transitions. [2020-09-21 10:17:28,451 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 76 transitions. Word has length 56 [2020-09-21 10:17:28,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:28,452 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 76 transitions. [2020-09-21 10:17:28,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:17:28,452 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 76 transitions. [2020-09-21 10:17:28,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-21 10:17:28,454 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:17:28,454 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] [2020-09-21 10:17:28,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:17:28,454 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:17:28,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:17:28,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1732137516, now seen corresponding path program 5 times [2020-09-21 10:17:28,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:17:28,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422957098] [2020-09-21 10:17:28,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:17:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:17:28,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 10:17:28,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-09-21 10:17:28,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-09-21 10:17:28,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 10:17:28,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:17:28,728 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 29 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-09-21 10:17:28,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422957098] [2020-09-21 10:17:28,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:17:28,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:17:28,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347076468] [2020-09-21 10:17:28,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:17:28,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:17:28,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:17:28,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:17:28,731 INFO L87 Difference]: Start difference. First operand 50 states and 76 transitions. Second operand 14 states. [2020-09-21 10:17:29,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:17:29,311 INFO L93 Difference]: Finished difference Result 95 states and 184 transitions. [2020-09-21 10:17:29,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:17:29,312 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-09-21 10:17:29,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:17:29,312 INFO L225 Difference]: With dead ends: 95 [2020-09-21 10:17:29,313 INFO L226 Difference]: Without dead ends: 0 [2020-09-21 10:17:29,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=219, Invalid=773, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:17:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-21 10:17:29,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-21 10:17:29,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-21 10:17:29,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-21 10:17:29,317 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2020-09-21 10:17:29,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:17:29,317 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-21 10:17:29,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:17:29,317 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-21 10:17:29,318 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-21 10:17:29,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:17:29,320 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-21 10:17:29,851 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 25 [2020-09-21 10:17:29,907 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-21 10:17:29,907 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:17:29,907 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:17:29,907 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-21 10:17:29,908 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-21 10:17:29,908 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-09-21 10:17:29,908 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-09-21 10:17:29,908 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|)) [2020-09-21 10:17:29,908 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-09-21 10:17:29,908 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-09-21 10:17:29,909 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|)) [2020-09-21 10:17:29,909 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|))))) [2020-09-21 10:17:29,909 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-09-21 10:17:29,909 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-09-21 10:17:29,909 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-09-21 10:17:29,910 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-09-21 10:17:29,910 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-09-21 10:17:29,910 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-09-21 10:17:29,910 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-09-21 10:17:29,910 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-09-21 10:17:29,910 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-09-21 10:17:29,911 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-09-21 10:17:29,911 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-09-21 10:17:29,911 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-09-21 10:17:29,911 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-09-21 10:17:29,911 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-09-21 10:17:29,911 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-09-21 10:17:29,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:17:29 BoogieIcfgContainer [2020-09-21 10:17:29,921 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:17:29,923 INFO L168 Benchmark]: Toolchain (without parser) took 5769.96 ms. Allocated memory was 140.5 MB in the beginning and 278.9 MB in the end (delta: 138.4 MB). Free memory was 104.4 MB in the beginning and 135.2 MB in the end (delta: -30.8 MB). Peak memory consumption was 107.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:29,924 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 10:17:29,925 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.29 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 93.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:29,926 INFO L168 Benchmark]: Boogie Preprocessor took 30.58 ms. Allocated memory is still 140.5 MB. Free memory was 93.9 MB in the beginning and 92.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:29,927 INFO L168 Benchmark]: RCFGBuilder took 379.88 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.5 MB in the beginning and 169.4 MB in the end (delta: -77.0 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:29,928 INFO L168 Benchmark]: TraceAbstraction took 5049.51 ms. Allocated memory was 202.9 MB in the beginning and 278.9 MB in the end (delta: 76.0 MB). Free memory was 168.8 MB in the beginning and 135.2 MB in the end (delta: 33.5 MB). Peak memory consumption was 109.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:17:29,932 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 300.29 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 93.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.58 ms. Allocated memory is still 140.5 MB. Free memory was 93.9 MB in the beginning and 92.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 379.88 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 92.5 MB in the beginning and 169.4 MB in the end (delta: -77.0 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5049.51 ms. Allocated memory was 202.9 MB in the beginning and 278.9 MB in the end (delta: 76.0 MB). Free memory was 168.8 MB in the beginning and 135.2 MB in the end (delta: 33.5 MB). Peak memory consumption was 109.6 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: 4.3s, OverallIterations: 8, TraceHistogramMax: 8, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 176 SDtfs, 135 SDslu, 693 SDs, 0 SdLazy, 1263 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, 1.3s 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, 0.3s HoareSimplificationTime, 9 FomulaSimplificationsInter, 222 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s 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...