/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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-d623d84 [2020-07-21 19:15:42,761 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:15:42,764 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:15:42,781 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:15:42,781 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:15:42,783 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:15:42,785 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:15:42,797 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:15:42,800 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:15:42,801 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:15:42,802 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:15:42,804 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:15:42,804 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:15:42,807 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:15:42,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:15:42,812 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:15:42,814 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:15:42,815 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:15:42,816 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:15:42,822 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:15:42,823 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:15:42,826 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:15:42,827 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:15:42,828 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:15:42,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 19:15:42,830 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 19:15:42,830 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 19:15:42,831 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 19:15:42,832 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 19:15:42,833 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 19:15:42,833 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 19:15:42,834 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 19:15:42,834 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 19:15:42,835 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 19:15:42,836 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 19:15:42,836 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 19:15:42,837 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 19:15:42,837 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 19:15:42,837 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:15:42,838 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:15:42,839 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:15:42,839 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 [2020-07-21 19:15:42,853 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:15:42,853 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:15:42,854 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:15:42,855 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:15:42,855 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:15:42,855 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:15:42,855 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:15:42,856 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:15:42,856 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:15:42,856 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:15:42,856 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:15:42,856 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:15:42,857 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:15:42,857 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:15:42,857 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:15:42,857 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:15:42,857 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:15:42,858 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:15:42,858 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:15:42,858 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:15:42,858 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:15:42,858 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:15:42,859 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:15:42,859 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:15:42,859 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:15:42,859 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:15:42,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,860 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:15:42,860 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:15:42,860 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 -> DAGSIZE 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 -> 2 [2020-07-21 19:15:43,140 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:15:43,162 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:15:43,166 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:15:43,168 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:15:43,168 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:15:43,169 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-21 19:15:43,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3efe923fd/f5a012b189f34a2ca7cc21e4511cc9e3/FLAGbdd83f984 [2020-07-21 19:15:43,679 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:15:43,680 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-07-21 19:15:43,687 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3efe923fd/f5a012b189f34a2ca7cc21e4511cc9e3/FLAGbdd83f984 [2020-07-21 19:15:44,069 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3efe923fd/f5a012b189f34a2ca7cc21e4511cc9e3 [2020-07-21 19:15:44,077 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:15:44,079 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:15:44,080 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:44,080 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:15:44,083 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:15:44,084 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,087 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72c8a2ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,087 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:15:44,113 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:15:44,278 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:44,284 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:15:44,303 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:44,315 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:15:44,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44 WrapperNode [2020-07-21 19:15:44,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:44,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:15:44,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:15:44,316 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:15:44,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,335 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,335 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,339 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,342 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (1/1) ... [2020-07-21 19:15:44,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:15:44,344 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:15:44,344 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:15:44,344 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:15:44,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (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 [2020-07-21 19:15:44,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:15:44,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:15:44,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-21 19:15:44,476 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:15:44,476 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:15:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:15:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-21 19:15:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:15:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:15:44,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:15:44,668 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:15:44,668 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:15:44,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:44 BoogieIcfgContainer [2020-07-21 19:15:44,672 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:15:44,674 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:15:44,674 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:15:44,677 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:15:44,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:15:44" (1/3) ... [2020-07-21 19:15:44,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@582c9c45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:44" (2/3) ... [2020-07-21 19:15:44,679 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@582c9c45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:44, skipping insertion in model container [2020-07-21 19:15:44,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:44" (3/3) ... [2020-07-21 19:15:44,680 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-07-21 19:15:44,693 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:15:44,701 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:15:44,716 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:15:44,746 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:15:44,746 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:15:44,746 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:15:44,747 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:15:44,747 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:15:44,747 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:15:44,747 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:15:44,747 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:15:44,781 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 19:15:44,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 19:15:44,793 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:44,794 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:44,795 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:44,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:44,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-21 19:15:44,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:44,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1001260904] [2020-07-21 19:15:44,814 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:44,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:44,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:44,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:15:44,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:45,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:15:45,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:45,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1001260904] [2020-07-21 19:15:45,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:45,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:15:45,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56872414] [2020-07-21 19:15:45,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:15:45,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:45,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:15:45,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:45,028 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 6 states. [2020-07-21 19:15:45,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:45,172 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2020-07-21 19:15:45,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:15:45,174 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-21 19:15:45,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:45,184 INFO L225 Difference]: With dead ends: 39 [2020-07-21 19:15:45,185 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 19:15:45,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:15:45,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 19:15:45,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 19:15:45,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 19:15:45,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-07-21 19:15:45,242 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-07-21 19:15:45,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:45,243 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-07-21 19:15:45,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:15:45,243 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-07-21 19:15:45,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:15:45,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:45,246 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] [2020-07-21 19:15:45,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:45,453 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:45,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:45,454 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-21 19:15:45,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:45,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971376600] [2020-07-21 19:15:45,455 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:45,497 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:45,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:45,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:15:45,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:45,564 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:15:45,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:45,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:15:45,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971376600] [2020-07-21 19:15:45,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:15:45,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2020-07-21 19:15:45,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87167883] [2020-07-21 19:15:45,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:15:45,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:45,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:15:45,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:15:45,815 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-07-21 19:15:45,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:45,967 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-07-21 19:15:45,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:15:45,968 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 19:15:45,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:45,969 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:15:45,970 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:15:45,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:15:45,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:15:45,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:15:45,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:15:45,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-07-21 19:15:45,980 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-07-21 19:15:45,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:45,980 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-07-21 19:15:45,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:15:45,981 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-07-21 19:15:45,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:15:45,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:45,982 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] [2020-07-21 19:15:46,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:46,200 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:46,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:46,201 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-07-21 19:15:46,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:46,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307753338] [2020-07-21 19:15:46,202 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:46,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:46,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:46,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:15:46,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:46,288 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:15:46,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:46,432 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:15:46,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307753338] [2020-07-21 19:15:46,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:46,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 19:15:46,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614610077] [2020-07-21 19:15:46,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:15:46,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:46,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:15:46,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:15:46,435 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 9 states. [2020-07-21 19:15:46,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:46,578 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-07-21 19:15:46,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:15:46,578 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-21 19:15:46,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:46,580 INFO L225 Difference]: With dead ends: 53 [2020-07-21 19:15:46,580 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:15:46,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:15:46,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:15:46,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 19:15:46,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 19:15:46,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-07-21 19:15:46,589 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-07-21 19:15:46,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:46,589 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-07-21 19:15:46,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:15:46,590 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-07-21 19:15:46,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 19:15:46,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:46,592 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] [2020-07-21 19:15:46,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:46,805 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:46,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:46,806 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-07-21 19:15:46,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:46,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157320936] [2020-07-21 19:15:46,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:46,845 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:46,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:46,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:15:46,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:46,934 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 19:15:46,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:47,543 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 19:15:47,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157320936] [2020-07-21 19:15:47,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:47,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13] total 22 [2020-07-21 19:15:47,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761389342] [2020-07-21 19:15:47,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 19:15:47,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:47,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 19:15:47,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:15:47,546 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 22 states. [2020-07-21 19:15:48,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:48,157 INFO L93 Difference]: Finished difference Result 56 states and 88 transitions. [2020-07-21 19:15:48,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 19:15:48,157 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 35 [2020-07-21 19:15:48,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:48,161 INFO L225 Difference]: With dead ends: 56 [2020-07-21 19:15:48,161 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 19:15:48,162 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=222, Invalid=1184, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:15:48,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 19:15:48,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2020-07-21 19:15:48,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:15:48,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 67 transitions. [2020-07-21 19:15:48,177 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 67 transitions. Word has length 35 [2020-07-21 19:15:48,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:48,178 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 67 transitions. [2020-07-21 19:15:48,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 19:15:48,178 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 67 transitions. [2020-07-21 19:15:48,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 19:15:48,180 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:48,181 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:48,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:48,395 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:48,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:48,395 INFO L82 PathProgramCache]: Analyzing trace with hash -692340191, now seen corresponding path program 2 times [2020-07-21 19:15:48,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:48,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35658129] [2020-07-21 19:15:48,396 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:48,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:48,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:48,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:15:48,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:48,487 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 34 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 19:15:48,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:48,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:49,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:15:49,039 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 34 proven. 19 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-07-21 19:15:49,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35658129] [2020-07-21 19:15:49,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:49,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:15:49,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423867263] [2020-07-21 19:15:49,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:15:49,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:49,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:15:49,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:15:49,043 INFO L87 Difference]: Start difference. First operand 41 states and 67 transitions. Second operand 13 states. [2020-07-21 19:15:49,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:49,288 INFO L93 Difference]: Finished difference Result 101 states and 246 transitions. [2020-07-21 19:15:49,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:15:49,289 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 49 [2020-07-21 19:15:49,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:49,292 INFO L225 Difference]: With dead ends: 101 [2020-07-21 19:15:49,293 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:15:49,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 79 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:15:49,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:15:49,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-07-21 19:15:49,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 19:15:49,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 135 transitions. [2020-07-21 19:15:49,315 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 135 transitions. Word has length 49 [2020-07-21 19:15:49,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:49,316 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 135 transitions. [2020-07-21 19:15:49,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:15:49,316 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 135 transitions. [2020-07-21 19:15:49,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 19:15:49,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:49,319 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] [2020-07-21 19:15:49,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:49,534 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:49,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:49,535 INFO L82 PathProgramCache]: Analyzing trace with hash -2059848011, now seen corresponding path program 3 times [2020-07-21 19:15:49,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:49,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442325954] [2020-07-21 19:15:49,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:49,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:49,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:49,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:15:49,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:49,602 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 60 proven. 1 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 19:15:49,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:49,762 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 33 proven. 15 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2020-07-21 19:15:49,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442325954] [2020-07-21 19:15:49,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:49,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-07-21 19:15:49,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082672478] [2020-07-21 19:15:49,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:49,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:49,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:49,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:49,770 INFO L87 Difference]: Start difference. First operand 68 states and 135 transitions. Second operand 5 states. [2020-07-21 19:15:49,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:49,825 INFO L93 Difference]: Finished difference Result 125 states and 301 transitions. [2020-07-21 19:15:49,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 19:15:49,828 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 56 [2020-07-21 19:15:49,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:49,830 INFO L225 Difference]: With dead ends: 125 [2020-07-21 19:15:49,830 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 19:15:49,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:49,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 19:15:49,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 19:15:49,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:15:49,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 136 transitions. [2020-07-21 19:15:49,865 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 136 transitions. Word has length 56 [2020-07-21 19:15:49,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:49,865 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 136 transitions. [2020-07-21 19:15:49,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:49,865 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 136 transitions. [2020-07-21 19:15:49,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 19:15:49,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:49,874 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:50,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:50,075 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:50,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:50,076 INFO L82 PathProgramCache]: Analyzing trace with hash -615976298, now seen corresponding path program 4 times [2020-07-21 19:15:50,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:50,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148733090] [2020-07-21 19:15:50,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:15:50,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:15:50,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:50,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 19:15:50,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:50,249 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 64 proven. 37 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 19:15:50,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:51,770 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 80 proven. 26 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 19:15:51,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148733090] [2020-07-21 19:15:51,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:51,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 24 [2020-07-21 19:15:51,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63499453] [2020-07-21 19:15:51,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 19:15:51,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:51,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 19:15:51,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:15:51,772 INFO L87 Difference]: Start difference. First operand 70 states and 136 transitions. Second operand 24 states. [2020-07-21 19:15:52,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:52,098 INFO L93 Difference]: Finished difference Result 100 states and 206 transitions. [2020-07-21 19:15:52,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:15:52,100 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-07-21 19:15:52,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:52,101 INFO L225 Difference]: With dead ends: 100 [2020-07-21 19:15:52,101 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:15:52,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=217, Invalid=973, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:15:52,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:15:52,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:15:52,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:15:52,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:15:52,104 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2020-07-21 19:15:52,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:52,105 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:15:52,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 19:15:52,105 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:15:52,105 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:15:52,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:52,320 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:15:52,778 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 22 [2020-07-21 19:15:52,874 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:15:52,874 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:15:52,874 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:15:52,875 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:15:52,875 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:15:52,875 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:15:52,876 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-07-21 19:15:52,876 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (<= |ackermann_#in~n| ackermann_~n) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (<= ackermann_~m |ackermann_#in~m|)) [2020-07-21 19:15:52,876 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-07-21 19:15:52,876 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-07-21 19:15:52,876 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |ackermann_#in~m| ackermann_~m) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (<= |ackermann_#in~n| ackermann_~n) (<= ackermann_~m |ackermann_#in~m|) (<= |ackermann_#in~n| 0)) [2020-07-21 19:15:52,876 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse0 (<= |ackermann_#in~m| ackermann_~m)) (.cse1 (<= |ackermann_#in~n| ackermann_~n)) (.cse2 (<= 1 |ackermann_#in~m|))) (or (and .cse0 .cse1 (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1) .cse2) (and .cse0 (<= ackermann_~m 0) .cse1 (<= 0 |ackermann_#in~m|)) (and .cse0 (<= 3 |ackermann_#t~ret1|) .cse1 (<= ackermann_~m |ackermann_#in~m|) .cse2))) [2020-07-21 19:15:52,877 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-07-21 19:15:52,877 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-21 19:15:52,877 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-07-21 19:15:52,878 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-07-21 19:15:52,878 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-07-21 19:15:52,878 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-07-21 19:15:52,878 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-07-21 19:15:52,878 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-07-21 19:15:52,878 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-07-21 19:15:52,879 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-07-21 19:15:52,879 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-07-21 19:15:52,879 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-07-21 19:15:52,879 INFO L271 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: true [2020-07-21 19:15:52,879 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-07-21 19:15:52,880 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-07-21 19:15:52,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:15:52 BoogieIcfgContainer [2020-07-21 19:15:52,892 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:15:52,895 INFO L168 Benchmark]: Toolchain (without parser) took 8815.31 ms. Allocated memory was 138.9 MB in the beginning and 296.7 MB in the end (delta: 157.8 MB). Free memory was 103.9 MB in the beginning and 241.3 MB in the end (delta: -137.4 MB). Peak memory consumption was 165.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:15:52,897 INFO L168 Benchmark]: CDTParser took 0.49 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 19:15:52,898 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.98 ms. Allocated memory is still 138.9 MB. Free memory was 103.5 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:15:52,904 INFO L168 Benchmark]: Boogie Preprocessor took 27.19 ms. Allocated memory is still 138.9 MB. Free memory was 93.8 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. [2020-07-21 19:15:52,905 INFO L168 Benchmark]: RCFGBuilder took 328.75 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 92.5 MB in the beginning and 169.1 MB in the end (delta: -76.6 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:15:52,906 INFO L168 Benchmark]: TraceAbstraction took 8218.17 ms. Allocated memory was 202.4 MB in the beginning and 296.7 MB in the end (delta: 94.4 MB). Free memory was 169.1 MB in the beginning and 241.3 MB in the end (delta: -72.3 MB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:15:52,914 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.49 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 235.98 ms. Allocated memory is still 138.9 MB. Free memory was 103.5 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.19 ms. Allocated memory is still 138.9 MB. Free memory was 93.8 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 328.75 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 92.5 MB in the beginning and 169.1 MB in the end (delta: -76.6 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8218.17 ms. Allocated memory was 202.4 MB in the beginning and 296.7 MB in the end (delta: 94.4 MB). Free memory was 169.1 MB in the beginning and 241.3 MB in the end (delta: -72.3 MB). Peak memory consumption was 167.6 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: 7.5s, OverallIterations: 7, TraceHistogramMax: 9, AutomataDifference: 1.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 153 SDtfs, 178 SDslu, 698 SDs, 0 SdLazy, 909 SolverSat, 233 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 576 GetRequests, 432 SyntacticMatches, 23 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=6, 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, 7 MinimizatonAttempts, 11 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 145 PreInvPairs, 197 NumberOfFragments, 91 HoareAnnotationTreeSize, 145 FomulaSimplifications, 204 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 9 FomulaSimplificationsInter, 609 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.7s InterpolantComputationTime, 274 NumberOfCodeBlocks, 250 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 520 ConstructedInterpolants, 0 QuantifiedInterpolants, 49756 SizeOfPredicates, 25 NumberOfNonLiveVariables, 780 ConjunctsInSsa, 65 ConjunctsInUnsatCore, 13 InterpolantComputations, 2 PerfectInterpolantSequences, 655/788 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...