/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/recHanoi03-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:33:14,301 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:33:14,304 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:33:14,321 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:33:14,321 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:33:14,323 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:33:14,325 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:33:14,327 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:33:14,329 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:33:14,331 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:33:14,332 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:33:14,334 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:33:14,334 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:33:14,335 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:33:14,337 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:33:14,339 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:33:14,340 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:33:14,341 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:33:14,345 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:33:14,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:33:14,349 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:33:14,351 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:33:14,352 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:33:14,354 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:33:14,357 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 16:33:14,357 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 16:33:14,358 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 16:33:14,359 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 16:33:14,360 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 16:33:14,361 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 16:33:14,361 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 16:33:14,363 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 16:33:14,364 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 16:33:14,365 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 16:33:14,367 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 16:33:14,367 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 16:33:14,368 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 16:33:14,368 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 16:33:14,368 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:33:14,370 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:33:14,370 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:33:14,371 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 16:33:14,389 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:33:14,390 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:33:14,391 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:33:14,392 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:33:14,392 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:33:14,392 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:33:14,392 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:33:14,393 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:33:14,393 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:33:14,393 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:33:14,393 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:33:14,393 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:33:14,394 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:33:14,394 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:33:14,394 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:33:14,394 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:33:14,394 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:33:14,395 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:33:14,395 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:33:14,395 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:33:14,395 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:33:14,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:33:14,396 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:33:14,396 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:33:14,396 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:33:14,397 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:33:14,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:14,397 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:33:14,397 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:33:14,397 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 16:33:14,730 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:33:14,747 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:33:14,751 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:33:14,753 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:33:14,754 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:33:14,755 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-20 16:33:14,864 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f198e9b/ff65fbf75faf4741894b5b67fd48b85f/FLAG0dc48dfd2 [2020-07-20 16:33:15,465 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:33:15,466 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-20 16:33:15,476 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f198e9b/ff65fbf75faf4741894b5b67fd48b85f/FLAG0dc48dfd2 [2020-07-20 16:33:15,829 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a7f198e9b/ff65fbf75faf4741894b5b67fd48b85f [2020-07-20 16:33:15,844 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:33:15,848 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:33:15,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:33:15,850 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:33:15,855 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:33:15,856 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:33:15" (1/1) ... [2020-07-20 16:33:15,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@235b9204 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:15, skipping insertion in model container [2020-07-20 16:33:15,862 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:33:15" (1/1) ... [2020-07-20 16:33:15,873 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:33:15,896 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:33:16,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:33:16,110 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:33:16,130 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:33:16,150 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:33:16,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16 WrapperNode [2020-07-20 16:33:16,151 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:33:16,153 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:33:16,153 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:33:16,153 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:33:16,173 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,182 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,187 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,191 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (1/1) ... [2020-07-20 16:33:16,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:33:16,195 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:33:16,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:33:16,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:33:16,197 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (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 16:33:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:33:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:33:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2020-07-20 16:33:16,382 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:33:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:33:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:33:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2020-07-20 16:33:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:33:16,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:33:16,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:33:16,593 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:33:16,594 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:33:16,598 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:33:16 BoogieIcfgContainer [2020-07-20 16:33:16,599 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:33:16,600 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:33:16,601 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:33:16,605 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:33:16,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:33:15" (1/3) ... [2020-07-20 16:33:16,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66430780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:33:16, skipping insertion in model container [2020-07-20 16:33:16,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:33:16" (2/3) ... [2020-07-20 16:33:16,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66430780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:33:16, skipping insertion in model container [2020-07-20 16:33:16,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:33:16" (3/3) ... [2020-07-20 16:33:16,611 INFO L109 eAbstractionObserver]: Analyzing ICFG recHanoi03-2.c [2020-07-20 16:33:16,625 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:33:16,636 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:33:16,656 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:33:16,688 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:33:16,689 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:33:16,689 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:33:16,689 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:33:16,689 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:33:16,689 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:33:16,690 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:33:16,690 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:33:16,715 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 16:33:16,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:33:16,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:16,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:16,728 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:16,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:16,738 INFO L82 PathProgramCache]: Analyzing trace with hash 913793727, now seen corresponding path program 1 times [2020-07-20 16:33:16,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:16,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711420564] [2020-07-20 16:33:16,751 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 16:33:16,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:33:16,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:33:16,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:33:16,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:17,029 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 16:33:17,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:33:17,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711420564] [2020-07-20 16:33:17,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:33:17,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 16:33:17,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499383544] [2020-07-20 16:33:17,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 16:33:17,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:17,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 16:33:17,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:33:17,069 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-20 16:33:17,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:33:17,248 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-20 16:33:17,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:33:17,251 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-20 16:33:17,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:33:17,267 INFO L225 Difference]: With dead ends: 33 [2020-07-20 16:33:17,267 INFO L226 Difference]: Without dead ends: 19 [2020-07-20 16:33:17,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:33:17,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-20 16:33:17,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-20 16:33:17,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-20 16:33:17,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-07-20 16:33:17,344 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2020-07-20 16:33:17,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:33:17,345 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-07-20 16:33:17,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 16:33:17,345 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-07-20 16:33:17,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 16:33:17,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:17,348 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:17,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:17,565 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:17,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:17,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1998834103, now seen corresponding path program 1 times [2020-07-20 16:33:17,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:17,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967282524] [2020-07-20 16:33:17,568 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 16:33:17,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:33:17,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:33:17,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:33:17,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:17,830 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 16:33:17,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:33:18,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:33:18,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:33:41,299 WARN L193 SmtUtils]: Spent 5.26 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:33:57,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:33:59,418 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 16:33:59,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967282524] [2020-07-20 16:33:59,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:33:59,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2020-07-20 16:33:59,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854939196] [2020-07-20 16:33:59,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:33:59,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:59,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:33:59,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=161, Unknown=10, NotChecked=0, Total=210 [2020-07-20 16:33:59,423 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2020-07-20 16:34:03,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:03,969 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-20 16:34:03,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:34:03,971 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-07-20 16:34:03,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:03,973 INFO L225 Difference]: With dead ends: 31 [2020-07-20 16:34:03,973 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 16:34:03,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 45.6s TimeCoverageRelationStatistics Valid=76, Invalid=292, Unknown=12, NotChecked=0, Total=380 [2020-07-20 16:34:03,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 16:34:03,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-20 16:34:03,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 16:34:03,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-20 16:34:03,989 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-07-20 16:34:03,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:03,990 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-20 16:34:03,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:34:03,991 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-20 16:34:03,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 16:34:03,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:03,996 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:04,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:04,214 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:04,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:04,215 INFO L82 PathProgramCache]: Analyzing trace with hash -547108535, now seen corresponding path program 2 times [2020-07-20 16:34:04,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:04,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927475655] [2020-07-20 16:34:04,216 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 16:34:04,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:34:04,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:04,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:34:04,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:15,154 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 16:34:15,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:34:15,972 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:34:16,097 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:34:16,217 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:34:16,322 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:34:17,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927475655] [2020-07-20 16:34:17,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:34:17,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-20 16:34:17,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331764008] [2020-07-20 16:34:17,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:34:17,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:17,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:34:17,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=219, Unknown=5, NotChecked=0, Total=272 [2020-07-20 16:34:17,277 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2020-07-20 16:34:29,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:29,376 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-20 16:34:29,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:34:29,380 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-20 16:34:29,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:29,382 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:34:29,382 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:34:29,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=90, Invalid=457, Unknown=5, NotChecked=0, Total=552 [2020-07-20 16:34:29,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:34:29,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 16:34:29,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 16:34:29,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-20 16:34:29,392 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 32 [2020-07-20 16:34:29,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:29,393 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-20 16:34:29,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:34:29,393 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-20 16:34:29,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 16:34:29,395 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:29,395 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:29,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:29,597 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:29,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:29,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1152432193, now seen corresponding path program 3 times [2020-07-20 16:34:29,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:29,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371984541] [2020-07-20 16:34:29,599 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 16:34:29,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:34:29,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:29,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 16:34:29,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:03,621 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:35:03,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:04,649 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:35:04,762 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:35:04,892 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:35:05,019 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:35:05,166 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:35:05,313 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:35:05,479 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:35:05,639 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:35:06,535 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:35:06,748 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:35:06,853 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:35:06,983 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:35:07,108 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:35:07,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371984541] [2020-07-20 16:35:07,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:35:07,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 16:35:07,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685543943] [2020-07-20 16:35:07,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:35:07,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:07,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:35:07,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=270, Unknown=16, NotChecked=0, Total=342 [2020-07-20 16:35:07,303 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2020-07-20 16:36:01,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:01,519 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-07-20 16:36:01,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:36:01,533 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-07-20 16:36:01,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:01,534 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:36:01,534 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 16:36:01,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 72.7s TimeCoverageRelationStatistics Valid=110, Invalid=622, Unknown=24, NotChecked=0, Total=756 [2020-07-20 16:36:01,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 16:36:01,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 16:36:01,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:36:01,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-20 16:36:01,544 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 38 [2020-07-20 16:36:01,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:01,544 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-20 16:36:01,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:36:01,545 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-20 16:36:01,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 16:36:01,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:01,547 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:01,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:01,750 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:01,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:01,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1461718089, now seen corresponding path program 4 times [2020-07-20 16:36:01,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:01,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488655482] [2020-07-20 16:36:01,752 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 16:36:01,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:36:01,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:01,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 16:36:01,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:36:53,109 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:36:53,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:36:54,031 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:36:54,138 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:36:54,267 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:54,396 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:54,547 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:54,702 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:54,878 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:36:55,049 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:36:55,247 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:55,446 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:55,656 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:55,814 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:55,996 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:36:56,174 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:36:56,360 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:36:56,544 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:36:57,411 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:36:57,519 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:36:57,646 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:57,771 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:57,923 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:58,073 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:58,240 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:36:58,404 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:36:58,595 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:58,782 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:58,994 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:59,199 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:59,347 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:36:59,477 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:59,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488655482] [2020-07-20 16:36:59,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:36:59,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-20 16:36:59,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147473907] [2020-07-20 16:36:59,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:36:59,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:59,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:36:59,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=333, Unknown=23, NotChecked=0, Total=420 [2020-07-20 16:36:59,728 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2020-07-20 16:39:30,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:39:30,184 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 16:39:30,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:39:30,199 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2020-07-20 16:39:30,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:39:30,200 INFO L225 Difference]: With dead ends: 38 [2020-07-20 16:39:30,201 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 16:39:30,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 137.9s TimeCoverageRelationStatistics Valid=130, Invalid=816, Unknown=46, NotChecked=0, Total=992 [2020-07-20 16:39:30,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 16:39:30,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-20 16:39:30,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 16:39:30,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-20 16:39:30,211 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 44 [2020-07-20 16:39:30,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:39:30,211 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-20 16:39:30,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:39:30,212 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-20 16:39:30,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-20 16:39:30,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:39:30,214 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:39:30,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:30,419 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:39:30,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:39:30,420 INFO L82 PathProgramCache]: Analyzing trace with hash -269168065, now seen corresponding path program 5 times [2020-07-20 16:39:30,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:39:30,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126562633] [2020-07-20 16:39:30,421 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 16:39:30,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:39:30,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:39:30,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 16:39:30,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:40:58,013 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 16:40:58,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:40:58,956 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:40:59,092 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:40:59,228 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:40:59,390 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:40:59,551 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:40:59,745 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:40:59,939 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:00,142 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:41:00,350 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:41:00,601 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:41:00,850 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:41:01,132 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:41:01,410 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:41:01,732 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:41:02,034 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:41:02,373 WARN L193 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:02,702 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:03,064 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:03,431 WARN L193 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:03,904 WARN L193 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:41:04,298 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:41:04,726 WARN L193 SmtUtils]: Spent 421.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 16:41:05,147 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 16:41:06,087 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:41:06,192 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:41:06,325 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:41:06,457 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 16:41:06,617 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:41:06,784 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:41:06,982 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:07,174 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:07,389 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:41:07,602 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:41:07,843 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:41:08,087 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:41:08,366 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:41:08,640 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:41:08,943 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:41:09,255 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:41:09,589 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:09,926 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:10,286 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:10,663 WARN L193 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:10,921 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:41:11,145 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:41:11,352 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:41:11,558 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:41:11,718 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:41:11,865 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:12,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126562633] [2020-07-20 16:41:12,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:41:12,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-20 16:41:12,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558970558] [2020-07-20 16:41:12,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:41:12,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:41:12,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:41:12,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=396, Unknown=38, NotChecked=0, Total=506 [2020-07-20 16:41:12,267 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 18 states. [2020-07-20 16:44:30,270 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:44:59,021 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:45:15,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:15,509 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2020-07-20 16:45:15,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:45:15,524 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-07-20 16:45:15,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:15,527 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:45:15,527 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:45:15,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 232.1s TimeCoverageRelationStatistics Valid=150, Invalid=1034, Unknown=76, NotChecked=0, Total=1260 [2020-07-20 16:45:15,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:45:15,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-20 16:45:15,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-20 16:45:15,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-20 16:45:15,536 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 50 [2020-07-20 16:45:15,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:15,536 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-20 16:45:15,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:45:15,536 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-20 16:45:15,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 16:45:15,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:15,538 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:15,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:15,754 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:15,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:15,755 INFO L82 PathProgramCache]: Analyzing trace with hash 585432905, now seen corresponding path program 6 times [2020-07-20 16:45:15,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:15,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344914662] [2020-07-20 16:45:15,757 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 16:45:15,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:15,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:15,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 16:45:15,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:54,492 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:47:27,387 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:47:43,541 WARN L194 Executor]: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000) stderr output: (error "out of memory") [2020-07-20 16:47:43,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344914662] [2020-07-20 16:47:43,545 WARN L333 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000)Received EOF on stdin. stderr output: (error "out of memory") [2020-07-20 16:47:43,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:47:43,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2020-07-20 16:47:43,545 ERROR L206 FreeRefinementEngine]: Strategy FIXED_PREFERENCES failed to provide any proof altough trace is infeasible [2020-07-20 16:47:43,546 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:47:43,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:43,779 WARN L231 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-07-20 16:47:43,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:47:43 BoogieIcfgContainer [2020-07-20 16:47:43,780 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:47:43,782 INFO L168 Benchmark]: Toolchain (without parser) took 867936.45 ms. Allocated memory was 144.7 MB in the beginning and 228.6 MB in the end (delta: 83.9 MB). Free memory was 101.6 MB in the beginning and 182.8 MB in the end (delta: -81.2 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,783 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,783 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.23 ms. Allocated memory is still 144.7 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,784 INFO L168 Benchmark]: Boogie Preprocessor took 42.06 ms. Allocated memory is still 144.7 MB. Free memory was 92.1 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,785 INFO L168 Benchmark]: RCFGBuilder took 403.66 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 90.6 MB in the beginning and 170.7 MB in the end (delta: -80.1 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,786 INFO L168 Benchmark]: TraceAbstraction took 867179.72 ms. Allocated memory was 202.4 MB in the beginning and 228.6 MB in the end (delta: 26.2 MB). Free memory was 170.0 MB in the beginning and 182.8 MB in the end (delta: -12.8 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:47:43,789 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 302.23 ms. Allocated memory is still 144.7 MB. Free memory was 101.4 MB in the beginning and 92.1 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 42.06 ms. Allocated memory is still 144.7 MB. Free memory was 92.1 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 403.66 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 90.6 MB in the beginning and 170.7 MB in the end (delta: -80.1 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 867179.72 ms. Allocated memory was 202.4 MB in the beginning and 228.6 MB in the end (delta: 26.2 MB). Free memory was 170.0 MB in the beginning and 182.8 MB in the end (delta: -12.8 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 33]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L25] int n = __VERIFIER_nondet_int(); [L26] COND FALSE !(n < 1 || n > 31) [L29] CALL, EXPR hanoi(n) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND FALSE !(n == 1) [L20] CALL, EXPR hanoi(n-1) [L17] COND TRUE n == 1 [L18] return 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L20] RET, EXPR hanoi(n-1) [L20] return 2 * (hanoi(n-1)) + 1; [L29] RET, EXPR hanoi(n) [L29] int result = hanoi(n); [L30] COND FALSE !(result >= n) [L33] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 867.0s, OverallIterations: 7, TraceHistogramMax: 8, AutomataDifference: 464.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 98 SDtfs, 48 SDslu, 783 SDs, 0 SdLazy, 956 SolverSat, 22 SolverUnsat, 82 SolverUnknown, 0 SolverNotchecked, 175.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 290 GetRequests, 152 SyntacticMatches, 3 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 506.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred 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: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 252.3s InterpolantComputationTime, 198 NumberOfCodeBlocks, 149 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 211 ConstructedInterpolants, 54 QuantifiedInterpolants, 84029 SizeOfPredicates, 38 NumberOfNonLiveVariables, 423 ConjunctsInSsa, 118 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 141/284 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...