/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:28:15,957 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 16:28:15,973 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:28:15,974 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:28:15,975 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:28:15,977 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:28:15,979 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:28:15,980 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:28:15,980 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:28:15,982 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:28:15,982 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:28:15,983 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:28:15,984 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:28:15,985 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:28:15,986 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:28:15,987 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:28:15,989 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:28:15,991 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:28:15,993 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:28:15,994 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:28:15,995 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:28:15,996 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:28:15,999 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:28:16,007 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:28:16,008 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:28:16,009 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:28:16,009 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:28:16,025 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:28:16,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:28:16,026 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:28:16,026 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:28:16,027 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:28:16,027 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:28:16,027 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:28:16,027 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:28:16,027 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:28:16,028 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:28:16,028 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:28:16,028 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:28:16,028 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:28:16,028 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:28:16,029 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:28:16,029 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:28:16,029 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:28:16,029 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:28:16,029 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:28:16,030 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:28:16,030 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:28:16,030 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:28:16,030 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:28:16,030 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:28:16,031 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:28:16,031 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:28:16,031 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:16,031 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:28:16,031 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:28:16,032 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:28:16,338 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:28:16,353 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:28:16,357 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:28:16,359 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:28:16,359 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:28:16,360 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann04.c [2020-07-20 16:28:16,424 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b114839f7/48b1431088aa47ff972ba74a8abad4c7/FLAGc613ef050 [2020-07-20 16:28:16,896 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:28:16,897 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann04.c [2020-07-20 16:28:16,905 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b114839f7/48b1431088aa47ff972ba74a8abad4c7/FLAGc613ef050 [2020-07-20 16:28:17,291 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b114839f7/48b1431088aa47ff972ba74a8abad4c7 [2020-07-20 16:28:17,299 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:28:17,301 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:28:17,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:17,303 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:28:17,306 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:28:17,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a035e66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17, skipping insertion in model container [2020-07-20 16:28:17,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,319 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:28:17,337 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:28:17,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:17,514 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:28:17,533 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:17,547 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:28:17,548 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17 WrapperNode [2020-07-20 16:28:17,548 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:17,549 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:28:17,549 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:28:17,549 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:28:17,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,562 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,655 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,655 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,659 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,663 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... [2020-07-20 16:28:17,665 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:28:17,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:28:17,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:28:17,665 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:28:17,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 16:28:17,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:28:17,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:28:17,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-20 16:28:17,731 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:28:17,732 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:28:17,732 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:28:17,732 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-20 16:28:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:28:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:28:17,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:28:17,932 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:28:17,932 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:28:17,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:17 BoogieIcfgContainer [2020-07-20 16:28:17,937 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:28:17,938 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:28:17,938 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:28:17,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:28:17,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:28:17" (1/3) ... [2020-07-20 16:28:17,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1712b646 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:17, skipping insertion in model container [2020-07-20 16:28:17,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:17" (2/3) ... [2020-07-20 16:28:17,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1712b646 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:17, skipping insertion in model container [2020-07-20 16:28:17,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:17" (3/3) ... [2020-07-20 16:28:17,945 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann04.c [2020-07-20 16:28:17,957 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:28:17,965 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:28:17,981 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:28:18,044 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:28:18,044 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:28:18,045 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:28:18,045 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:28:18,045 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:28:18,045 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:28:18,045 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:28:18,046 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:28:18,073 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 16:28:18,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 16:28:18,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:18,097 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:18,098 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:18,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:18,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-20 16:28:18,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:18,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603727197] [2020-07-20 16:28:18,115 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,183 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:18,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:18,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:28:18,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:18,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:28:18,277 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:28:18,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603727197] [2020-07-20 16:28:18,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:28:18,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:28:18,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154334299] [2020-07-20 16:28:18,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:28:18,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:18,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:28:18,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:28:18,301 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-20 16:28:18,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:18,444 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2020-07-20 16:28:18,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:28:18,446 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-20 16:28:18,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:18,458 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:28:18,459 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:28:18,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:28:18,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:28:18,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 16:28:18,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 16:28:18,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-20 16:28:18,515 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-20 16:28:18,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:18,516 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-20 16:28:18,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:28:18,516 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-20 16:28:18,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 16:28:18,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:18,520 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] [2020-07-20 16:28:18,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,736 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:18,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:18,737 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-20 16:28:18,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:18,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401761382] [2020-07-20 16:28:18,739 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:18,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:18,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:18,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:28:18,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:18,847 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:28:18,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:19,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:19,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:19,056 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:28:19,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401761382] [2020-07-20 16:28:19,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:19,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-20 16:28:19,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738846750] [2020-07-20 16:28:19,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 16:28:19,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:19,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 16:28:19,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:28:19,061 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-20 16:28:19,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:19,208 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-07-20 16:28:19,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:28:19,209 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 16:28:19,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:19,212 INFO L225 Difference]: With dead ends: 38 [2020-07-20 16:28:19,212 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 16:28:19,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:28:19,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 16:28:19,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 16:28:19,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 16:28:19,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-07-20 16:28:19,244 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 22 [2020-07-20 16:28:19,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:19,245 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-07-20 16:28:19,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 16:28:19,245 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-07-20 16:28:19,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 16:28:19,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:19,248 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:19,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:19,461 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:19,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:19,461 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-20 16:28:19,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:19,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551128854] [2020-07-20 16:28:19,462 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:19,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:28:19,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:19,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:28:19,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:19,542 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:28:19,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:19,625 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:28:19,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551128854] [2020-07-20 16:28:19,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:19,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 16:28:19,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131196351] [2020-07-20 16:28:19,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 16:28:19,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:19,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 16:28:19,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:28:19,628 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 8 states. [2020-07-20 16:28:19,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:19,760 INFO L93 Difference]: Finished difference Result 87 states and 187 transitions. [2020-07-20 16:28:19,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:28:19,760 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 16:28:19,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:19,766 INFO L225 Difference]: With dead ends: 87 [2020-07-20 16:28:19,766 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 16:28:19,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:28:19,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 16:28:19,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 16:28:19,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 16:28:19,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 112 transitions. [2020-07-20 16:28:19,790 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 112 transitions. Word has length 29 [2020-07-20 16:28:19,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:19,791 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 112 transitions. [2020-07-20 16:28:19,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 16:28:19,791 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 112 transitions. [2020-07-20 16:28:19,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-20 16:28:19,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:19,799 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:20,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:20,002 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:20,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:20,003 INFO L82 PathProgramCache]: Analyzing trace with hash -2091057537, now seen corresponding path program 1 times [2020-07-20 16:28:20,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:20,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105621000] [2020-07-20 16:28:20,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:20,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:20,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:20,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:28:20,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:20,213 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 384 proven. 111 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 16:28:20,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:21,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,291 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:21,847 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 123 proven. 278 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 16:28:21,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105621000] [2020-07-20 16:28:21,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:21,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:28:21,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343687248] [2020-07-20 16:28:21,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:28:21,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:21,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:28:21,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:28:21,850 INFO L87 Difference]: Start difference. First operand 57 states and 112 transitions. Second operand 17 states. [2020-07-20 16:28:22,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:22,390 INFO L93 Difference]: Finished difference Result 144 states and 403 transitions. [2020-07-20 16:28:22,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:28:22,390 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 122 [2020-07-20 16:28:22,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:22,402 INFO L225 Difference]: With dead ends: 144 [2020-07-20 16:28:22,402 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 16:28:22,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 213 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:28:22,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 16:28:22,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-07-20 16:28:22,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 16:28:22,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 154 transitions. [2020-07-20 16:28:22,454 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 154 transitions. Word has length 122 [2020-07-20 16:28:22,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:22,455 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 154 transitions. [2020-07-20 16:28:22,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:28:22,455 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 154 transitions. [2020-07-20 16:28:22,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:28:22,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:22,465 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:22,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:22,666 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:22,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:22,667 INFO L82 PathProgramCache]: Analyzing trace with hash 984881173, now seen corresponding path program 2 times [2020-07-20 16:28:22,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:22,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183533178] [2020-07-20 16:28:22,668 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:22,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:22,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:22,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:28:22,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:22,831 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 141 proven. 37 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2020-07-20 16:28:22,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:24,487 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 85 proven. 65 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 16:28:24,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183533178] [2020-07-20 16:28:24,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:24,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 24 [2020-07-20 16:28:24,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224348651] [2020-07-20 16:28:24,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:28:24,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:24,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:28:24,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:28:24,492 INFO L87 Difference]: Start difference. First operand 82 states and 154 transitions. Second operand 24 states. [2020-07-20 16:28:24,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:24,892 INFO L93 Difference]: Finished difference Result 150 states and 303 transitions. [2020-07-20 16:28:24,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:28:24,895 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 82 [2020-07-20 16:28:24,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:24,901 INFO L225 Difference]: With dead ends: 150 [2020-07-20 16:28:24,903 INFO L226 Difference]: Without dead ends: 85 [2020-07-20 16:28:24,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 138 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=217, Invalid=973, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:28:24,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-07-20 16:28:24,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-07-20 16:28:24,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 16:28:24,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 146 transitions. [2020-07-20 16:28:24,944 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 146 transitions. Word has length 82 [2020-07-20 16:28:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:24,946 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 146 transitions. [2020-07-20 16:28:24,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:28:24,946 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 146 transitions. [2020-07-20 16:28:24,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:28:24,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:24,950 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:25,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:25,167 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:25,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:25,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1060139340, now seen corresponding path program 3 times [2020-07-20 16:28:25,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:25,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038952031] [2020-07-20 16:28:25,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:25,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:25,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:25,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:28:25,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:25,389 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 385 proven. 71 refuted. 0 times theorem prover too weak. 205 trivial. 0 not checked. [2020-07-20 16:28:25,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:26,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:27,293 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 126 proven. 215 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2020-07-20 16:28:27,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038952031] [2020-07-20 16:28:27,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:27,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16] total 22 [2020-07-20 16:28:27,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243249901] [2020-07-20 16:28:27,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:28:27,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:27,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:28:27,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:28:27,296 INFO L87 Difference]: Start difference. First operand 82 states and 146 transitions. Second operand 22 states. [2020-07-20 16:28:27,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:27,794 INFO L93 Difference]: Finished difference Result 150 states and 285 transitions. [2020-07-20 16:28:27,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:28:27,795 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 121 [2020-07-20 16:28:27,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:27,798 INFO L225 Difference]: With dead ends: 150 [2020-07-20 16:28:27,798 INFO L226 Difference]: Without dead ends: 85 [2020-07-20 16:28:27,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 210 SyntacticMatches, 11 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=280, Invalid=1126, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:28:27,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-07-20 16:28:27,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-07-20 16:28:27,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 16:28:27,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 138 transitions. [2020-07-20 16:28:27,815 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 138 transitions. Word has length 121 [2020-07-20 16:28:27,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:27,816 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 138 transitions. [2020-07-20 16:28:27,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:28:27,816 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 138 transitions. [2020-07-20 16:28:27,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2020-07-20 16:28:27,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:27,818 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:28,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:28,032 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:28,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:28,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1835077495, now seen corresponding path program 4 times [2020-07-20 16:28:28,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:28,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203874683] [2020-07-20 16:28:28,033 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:28,151 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:28,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:28,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 16:28:28,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 475 proven. 114 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-20 16:28:28,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:29,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:29,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:30,398 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 155 proven. 295 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-20 16:28:30,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203874683] [2020-07-20 16:28:30,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:30,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 19 [2020-07-20 16:28:30,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755139106] [2020-07-20 16:28:30,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:28:30,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:30,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:28:30,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:28:30,401 INFO L87 Difference]: Start difference. First operand 82 states and 138 transitions. Second operand 19 states. [2020-07-20 16:28:31,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:31,010 INFO L93 Difference]: Finished difference Result 165 states and 311 transitions. [2020-07-20 16:28:31,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:28:31,011 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 134 [2020-07-20 16:28:31,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:31,014 INFO L225 Difference]: With dead ends: 165 [2020-07-20 16:28:31,015 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 16:28:31,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 232 SyntacticMatches, 18 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=312, Invalid=1094, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:28:31,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 16:28:31,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 97. [2020-07-20 16:28:31,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-07-20 16:28:31,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 170 transitions. [2020-07-20 16:28:31,053 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 170 transitions. Word has length 134 [2020-07-20 16:28:31,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:31,054 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 170 transitions. [2020-07-20 16:28:31,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:28:31,054 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 170 transitions. [2020-07-20 16:28:31,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-07-20 16:28:31,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:31,058 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 13, 10, 9, 9, 9, 9, 9, 9, 9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:31,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:31,272 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:31,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:31,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1434361927, now seen corresponding path program 5 times [2020-07-20 16:28:31,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:31,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640902069] [2020-07-20 16:28:31,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:31,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:31,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:31,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 16:28:31,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:31,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 421 proven. 286 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2020-07-20 16:28:31,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:33,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:33,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:33,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:33,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:33,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:36,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 467 proven. 286 refuted. 0 times theorem prover too weak. 493 trivial. 0 not checked. [2020-07-20 16:28:36,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640902069] [2020-07-20 16:28:36,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:36,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 27] total 33 [2020-07-20 16:28:36,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987918731] [2020-07-20 16:28:36,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:28:36,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:36,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:28:36,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:28:36,499 INFO L87 Difference]: Start difference. First operand 97 states and 170 transitions. Second operand 33 states. [2020-07-20 16:28:37,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:37,689 INFO L93 Difference]: Finished difference Result 211 states and 413 transitions. [2020-07-20 16:28:37,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 16:28:37,692 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 160 [2020-07-20 16:28:37,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:37,695 INFO L225 Difference]: With dead ends: 211 [2020-07-20 16:28:37,696 INFO L226 Difference]: Without dead ends: 131 [2020-07-20 16:28:37,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 263 SyntacticMatches, 25 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1059 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=807, Invalid=3353, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 16:28:37,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2020-07-20 16:28:37,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 121. [2020-07-20 16:28:37,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 16:28:37,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 221 transitions. [2020-07-20 16:28:37,717 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 221 transitions. Word has length 160 [2020-07-20 16:28:37,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:37,718 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 221 transitions. [2020-07-20 16:28:37,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:28:37,718 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 221 transitions. [2020-07-20 16:28:37,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-07-20 16:28:37,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:37,721 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 14, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:37,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:37,937 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:37,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:37,938 INFO L82 PathProgramCache]: Analyzing trace with hash -66876812, now seen corresponding path program 6 times [2020-07-20 16:28:37,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:37,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16506815] [2020-07-20 16:28:37,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:38,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:38,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:38,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 16:28:38,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:38,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 477 proven. 372 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 16:28:38,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:40,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:40,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:40,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:40,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:40,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:40,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:28:43,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 525 proven. 384 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2020-07-20 16:28:43,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16506815] [2020-07-20 16:28:43,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:43,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 28] total 30 [2020-07-20 16:28:43,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42178610] [2020-07-20 16:28:43,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 16:28:43,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:43,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 16:28:43,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:28:43,630 INFO L87 Difference]: Start difference. First operand 121 states and 221 transitions. Second operand 30 states. [2020-07-20 16:28:44,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:44,810 INFO L93 Difference]: Finished difference Result 250 states and 509 transitions. [2020-07-20 16:28:44,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 16:28:44,812 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 173 [2020-07-20 16:28:44,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:44,816 INFO L225 Difference]: With dead ends: 250 [2020-07-20 16:28:44,817 INFO L226 Difference]: Without dead ends: 146 [2020-07-20 16:28:44,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=867, Invalid=3293, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 16:28:44,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-20 16:28:44,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2020-07-20 16:28:44,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 16:28:44,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 257 transitions. [2020-07-20 16:28:44,847 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 257 transitions. Word has length 173 [2020-07-20 16:28:44,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:44,850 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 257 transitions. [2020-07-20 16:28:44,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 16:28:44,850 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 257 transitions. [2020-07-20 16:28:44,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2020-07-20 16:28:44,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:44,853 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 15, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:45,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:45,067 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:45,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:45,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1028004289, now seen corresponding path program 7 times [2020-07-20 16:28:45,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:45,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266130067] [2020-07-20 16:28:45,070 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:45,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:28:45,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:45,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 16:28:45,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:45,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 657 proven. 84 refuted. 0 times theorem prover too weak. 1000 trivial. 0 not checked. [2020-07-20 16:28:45,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:47,038 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:28:47,159 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:28:47,283 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:28:47,407 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:28:47,553 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:28:47,683 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:28:47,815 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:28:47,949 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:28:49,285 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:28:49,407 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:28:49,535 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:28:49,678 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:28:53,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 711 proven. 75 refuted. 0 times theorem prover too weak. 955 trivial. 0 not checked. [2020-07-20 16:28:53,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266130067] [2020-07-20 16:28:53,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:53,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 33] total 35 [2020-07-20 16:28:53,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284207617] [2020-07-20 16:28:53,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 16:28:53,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:53,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 16:28:53,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1055, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:28:53,348 INFO L87 Difference]: Start difference. First operand 136 states and 257 transitions. Second operand 35 states. [2020-07-20 16:28:55,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:55,886 INFO L93 Difference]: Finished difference Result 176 states and 328 transitions. [2020-07-20 16:28:55,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 16:28:55,888 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 186 [2020-07-20 16:28:55,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:55,890 INFO L225 Difference]: With dead ends: 176 [2020-07-20 16:28:55,890 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:28:55,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 312 SyntacticMatches, 26 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1458 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1019, Invalid=4383, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 16:28:55,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:28:55,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:28:55,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:28:55,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:28:55,898 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 186 [2020-07-20 16:28:55,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:55,898 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:28:55,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 16:28:55,898 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:28:55,899 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:28:56,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:56,114 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:28:57,484 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 14 [2020-07-20 16:28:58,574 WARN L193 SmtUtils]: Spent 1.09 s on a formula simplification. DAG size of input: 142 DAG size of output: 36 [2020-07-20 16:28:58,757 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 16 [2020-07-20 16:28:58,840 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:28:58,841 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:28:58,841 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:28:58,841 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:28:58,841 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:28:58,841 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:28:58,841 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 14 22) no Hoare annotation was computed. [2020-07-20 16:28:58,841 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 14 22) the Hoare annotation is: true [2020-07-20 16:28:58,842 INFO L264 CegarLoopResult]: At program point L21(line 21) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (or (not (<= |ackermann_#in~m| 0)) (not (<= 0 |ackermann_#in~m|))) (<= |ackermann_#in~n| ackermann_~n) (<= ackermann_~m |ackermann_#in~m|)) [2020-07-20 16:28:58,842 INFO L268 CegarLoopResult]: For program point L21-1(line 21) no Hoare annotation was computed. [2020-07-20 16:28:58,842 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (or (not (<= |ackermann_#in~m| 0)) (not (<= 0 |ackermann_#in~m|))) (<= |ackermann_#in~n| ackermann_~n) (<= ackermann_~m |ackermann_#in~m|) (<= |ackermann_#in~n| 0)) [2020-07-20 16:28:58,842 INFO L264 CegarLoopResult]: At program point L21-2(line 21) the Hoare annotation is: (let ((.cse5 (< |ackermann_#in~n| 2)) (.cse2 (<= |ackermann_#in~m| 1)) (.cse7 (<= 5 |ackermann_#t~ret1|)) (.cse6 (<= 6 |ackermann_#t~ret1|))) (and (let ((.cse0 (<= |ackermann_#in~m| ackermann_~m)) (.cse1 (<= |ackermann_#in~n| ackermann_~n)) (.cse3 (<= ackermann_~m |ackermann_#in~m|)) (.cse4 (<= 1 |ackermann_#in~m|))) (or (and .cse0 .cse1 .cse2 .cse3 (<= |ackermann_#in~n| 3) .cse4 (<= 4 |ackermann_#t~ret1|)) (and .cse0 .cse1 .cse5 .cse2 .cse3 (<= 2 |ackermann_#t~ret1|) .cse4) (and .cse0 .cse1 .cse3 .cse4 .cse6) (and .cse0 (<= 3 |ackermann_#t~ret1|) .cse1 .cse3 (<= |ackermann_#in~n| 2) .cse4) (and .cse0 (<= |ackermann_#in~n| 4) .cse1 .cse7 .cse2 .cse3 .cse4))) (or .cse5 .cse2 (and (<= ackermann_~m 2) .cse7) .cse6))) [2020-07-20 16:28:58,842 INFO L268 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point L21-3(line 21) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point L15(lines 15 17) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 14 22) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point L33(lines 33 38) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 43) no Hoare annotation was computed. [2020-07-20 16:28:58,843 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 45) the Hoare annotation is: true [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point L27(lines 27 31) no Hoare annotation was computed. [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 45) no Hoare annotation was computed. [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 45) no Hoare annotation was computed. [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point L43(line 43) no Hoare annotation was computed. [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point L40(lines 40 44) no Hoare annotation was computed. [2020-07-20 16:28:58,844 INFO L271 CegarLoopResult]: At program point L39(line 39) the Hoare annotation is: true [2020-07-20 16:28:58,844 INFO L268 CegarLoopResult]: For program point L39-1(line 39) no Hoare annotation was computed. [2020-07-20 16:28:58,850 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:28:58 BoogieIcfgContainer [2020-07-20 16:28:58,851 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:28:58,852 INFO L168 Benchmark]: Toolchain (without parser) took 41551.87 ms. Allocated memory was 145.2 MB in the beginning and 518.5 MB in the end (delta: 373.3 MB). Free memory was 102.4 MB in the beginning and 277.0 MB in the end (delta: -174.6 MB). Peak memory consumption was 376.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:58,853 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory is still 121.0 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 16:28:58,853 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.97 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:58,854 INFO L168 Benchmark]: Boogie Preprocessor took 115.85 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.5 MB in the beginning and 180.9 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:58,855 INFO L168 Benchmark]: RCFGBuilder took 271.74 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 167.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:58,856 INFO L168 Benchmark]: TraceAbstraction took 40912.59 ms. Allocated memory was 202.4 MB in the beginning and 518.5 MB in the end (delta: 316.1 MB). Free memory was 167.2 MB in the beginning and 277.0 MB in the end (delta: -109.8 MB). Peak memory consumption was 384.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:28:58,859 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 145.2 MB. Free memory is still 121.0 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 245.97 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 115.85 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.5 MB in the beginning and 180.9 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 271.74 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 167.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 40912.59 ms. Allocated memory was 202.4 MB in the beginning and 518.5 MB in the end (delta: 316.1 MB). Free memory was 167.2 MB in the beginning and 277.0 MB in the end (delta: -109.8 MB). Peak memory consumption was 384.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 43]: 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: 38.0s, OverallIterations: 10, TraceHistogramMax: 27, AutomataDifference: 7.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 2.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 267 SDtfs, 415 SDslu, 1627 SDs, 0 SdLazy, 3428 SolverSat, 1010 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2232 GetRequests, 1747 SyntacticMatches, 137 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4532 ImplicationChecksByTransitivity, 7.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=136occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 29 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 489 PreInvPairs, 1064 NumberOfFragments, 167 HoareAnnotationTreeSize, 489 FomulaSimplifications, 31517 FormulaSimplificationTreeSizeReduction, 1.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 8072 FormulaSimplificationTreeSizeReductionInter, 1.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 26.7s InterpolantComputationTime, 1044 NumberOfCodeBlocks, 917 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 2054 ConstructedInterpolants, 0 QuantifiedInterpolants, 570088 SizeOfPredicates, 72 NumberOfNonLiveVariables, 2882 ConjunctsInSsa, 199 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 11152/13838 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...