/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 BIGGEST_EQUIVALENCE_CLASS --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/Fibonacci01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:02:49,537 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:02:49,540 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:02:49,552 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:02:49,552 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:02:49,553 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:02:49,554 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:02:49,556 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:02:49,558 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:02:49,559 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:02:49,560 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:02:49,561 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:02:49,561 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:02:49,562 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:02:49,563 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:02:49,564 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:02:49,565 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:02:49,566 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:02:49,567 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:02:49,569 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:02:49,571 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:02:49,572 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:02:49,573 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:02:49,573 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:02:49,576 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:02:49,576 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:02:49,576 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:02:49,577 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:02:49,578 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:02:49,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:02:49,579 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:02:49,579 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:02:49,580 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:02:49,581 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:02:49,582 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:02:49,582 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:02:49,583 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:02:49,583 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:02:49,583 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:02:49,584 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:02:49,585 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:02:49,586 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 22:02:49,600 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:02:49,600 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:02:49,601 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:02:49,602 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:02:49,602 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:02:49,602 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:02:49,602 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:02:49,602 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:02:49,603 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:02:49,603 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:02:49,603 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:02:49,603 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:02:49,603 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:02:49,604 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:02:49,604 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:02:49,604 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:02:49,604 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:02:49,604 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:02:49,605 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:02:49,605 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:02:49,605 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:02:49,605 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:02:49,606 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:02:49,606 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:02:49,606 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:02:49,606 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:02:49,606 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:49,606 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:02:49,607 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:02:49,607 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:02:49,879 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:02:49,893 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:02:49,896 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:02:49,897 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:02:49,898 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:02:49,898 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-21 22:02:49,956 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33dd3d9c/55b4aadce9dc43c79b71c11cc087dabd/FLAG46578e021 [2020-07-21 22:02:50,347 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:02:50,347 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci01-1.c [2020-07-21 22:02:50,353 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33dd3d9c/55b4aadce9dc43c79b71c11cc087dabd/FLAG46578e021 [2020-07-21 22:02:50,790 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33dd3d9c/55b4aadce9dc43c79b71c11cc087dabd [2020-07-21 22:02:50,800 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:02:50,804 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:02:50,805 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:50,806 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:02:50,809 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:02:50,810 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:50" (1/1) ... [2020-07-21 22:02:50,813 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d82745c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:50, skipping insertion in model container [2020-07-21 22:02:50,813 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:02:50" (1/1) ... [2020-07-21 22:02:50,823 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:02:50,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:02:51,041 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:51,045 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:02:51,061 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:02:51,075 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:02:51,075 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51 WrapperNode [2020-07-21 22:02:51,075 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:02:51,076 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:02:51,076 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:02:51,076 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:02:51,089 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,095 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,095 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,101 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (1/1) ... [2020-07-21 22:02:51,102 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:02:51,103 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:02:51,103 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:02:51,103 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:02:51,104 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (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 22:02:51,252 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:02:51,252 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:02:51,252 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-07-21 22:02:51,252 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:02:51,253 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:02:51,253 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:02:51,253 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-07-21 22:02:51,254 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:02:51,254 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:02:51,254 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:02:51,455 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:02:51,456 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:02:51,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:51 BoogieIcfgContainer [2020-07-21 22:02:51,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:02:51,461 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:02:51,461 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:02:51,464 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:02:51,464 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:02:50" (1/3) ... [2020-07-21 22:02:51,465 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412d0989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:51, skipping insertion in model container [2020-07-21 22:02:51,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:02:51" (2/3) ... [2020-07-21 22:02:51,465 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412d0989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:02:51, skipping insertion in model container [2020-07-21 22:02:51,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:02:51" (3/3) ... [2020-07-21 22:02:51,467 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci01-1.c [2020-07-21 22:02:51,477 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:02:51,484 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:02:51,497 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:02:51,520 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:02:51,520 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:02:51,520 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:02:51,520 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:02:51,521 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:02:51,521 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:02:51,521 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:02:51,521 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:02:51,538 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:02:51,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:02:51,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:51,546 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:51,546 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:51,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:51,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1900973920, now seen corresponding path program 1 times [2020-07-21 22:02:51,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:51,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532718171] [2020-07-21 22:02:51,562 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 [2020-07-21 22:02:51,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:51,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:51,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:02:51,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:51,798 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 22:02:51,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:51,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532718171] [2020-07-21 22:02:51,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:51,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 22:02:51,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115424412] [2020-07-21 22:02:51,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 22:02:51,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:51,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 22:02:51,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:51,819 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 6 states. [2020-07-21 22:02:51,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:51,996 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-07-21 22:02:51,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:02:51,998 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 22:02:51,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:52,008 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:02:52,009 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 22:02:52,012 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 [2020-07-21 22:02:52,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 22:02:52,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 22:02:52,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 22:02:52,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-21 22:02:52,058 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-07-21 22:02:52,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:52,059 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-21 22:02:52,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 22:02:52,059 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-21 22:02:52,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 22:02:52,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:52,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:52,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:52,276 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:52,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:52,277 INFO L82 PathProgramCache]: Analyzing trace with hash -509871596, now seen corresponding path program 1 times [2020-07-21 22:02:52,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:52,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701650034] [2020-07-21 22:02:52,278 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 [2020-07-21 22:02:52,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:52,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:52,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 22:02:52,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:52,371 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 22:02:52,372 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:52,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701650034] [2020-07-21 22:02:52,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:52,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 22:02:52,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140187820] [2020-07-21 22:02:52,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 22:02:52,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:52,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 22:02:52,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:52,376 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-21 22:02:52,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:52,476 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-07-21 22:02:52,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:02:52,477 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-21 22:02:52,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:52,478 INFO L225 Difference]: With dead ends: 28 [2020-07-21 22:02:52,479 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:02:52,480 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 22:02:52,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:02:52,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-21 22:02:52,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 22:02:52,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-07-21 22:02:52,487 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2020-07-21 22:02:52,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:52,488 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-07-21 22:02:52,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 22:02:52,488 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-07-21 22:02:52,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:02:52,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:52,490 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] [2020-07-21 22:02:52,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:52,691 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:52,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:52,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1203666899, now seen corresponding path program 1 times [2020-07-21 22:02:52,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:52,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537544431] [2020-07-21 22:02:52,693 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 [2020-07-21 22:02:52,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:52,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:52,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 22:02:52,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:52,795 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:02:52,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:02:52,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537544431] [2020-07-21 22:02:52,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:02:52,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 22:02:52,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410038801] [2020-07-21 22:02:52,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 22:02:52,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:52,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 22:02:52,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:02:52,799 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 6 states. [2020-07-21 22:02:52,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:52,895 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2020-07-21 22:02:52,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:02:52,896 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-07-21 22:02:52,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:52,898 INFO L225 Difference]: With dead ends: 39 [2020-07-21 22:02:52,898 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:02:52,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:02:52,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:02:52,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:02:52,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:02:52,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-07-21 22:02:52,911 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 27 [2020-07-21 22:02:52,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:52,911 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-07-21 22:02:52,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 22:02:52,911 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-07-21 22:02:52,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 22:02:52,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:52,913 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 22:02:53,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:53,118 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:53,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:53,119 INFO L82 PathProgramCache]: Analyzing trace with hash -603082491, now seen corresponding path program 1 times [2020-07-21 22:02:53,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:53,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709739977] [2020-07-21 22:02:53,120 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 [2020-07-21 22:02:53,166 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:53,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:53,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:02:53,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:53,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:02:53,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:53,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:53,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:53,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:53,610 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:02:53,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709739977] [2020-07-21 22:02:53,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:53,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 17 [2020-07-21 22:02:53,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998564889] [2020-07-21 22:02:53,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:02:53,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:53,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:02:53,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:02:53,613 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 17 states. [2020-07-21 22:02:53,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:53,853 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2020-07-21 22:02:53,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:02:53,854 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2020-07-21 22:02:53,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:53,856 INFO L225 Difference]: With dead ends: 34 [2020-07-21 22:02:53,856 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:02:53,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:02:53,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:02:53,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-21 22:02:53,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 22:02:53,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2020-07-21 22:02:53,866 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 28 [2020-07-21 22:02:53,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:53,866 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2020-07-21 22:02:53,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:02:53,867 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2020-07-21 22:02:53,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:02:53,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:53,869 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:54,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:54,083 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:54,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:54,084 INFO L82 PathProgramCache]: Analyzing trace with hash -2046185202, now seen corresponding path program 2 times [2020-07-21 22:02:54,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:54,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300810712] [2020-07-21 22:02:54,086 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 [2020-07-21 22:02:54,124 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:54,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:54,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:02:54,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:54,197 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:02:54,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:54,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:54,521 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 22:02:54,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300810712] [2020-07-21 22:02:54,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:54,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:02:54,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095411482] [2020-07-21 22:02:54,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:02:54,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:54,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:02:54,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:02:54,524 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 11 states. [2020-07-21 22:02:54,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:54,655 INFO L93 Difference]: Finished difference Result 56 states and 80 transitions. [2020-07-21 22:02:54,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:02:54,657 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:02:54,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:54,658 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:02:54,658 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 22:02:54,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:02:54,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 22:02:54,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2020-07-21 22:02:54,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:02:54,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2020-07-21 22:02:54,673 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 41 [2020-07-21 22:02:54,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:54,674 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2020-07-21 22:02:54,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:02:54,674 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2020-07-21 22:02:54,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 22:02:54,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:54,676 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:54,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:54,879 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:54,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:54,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1391487784, now seen corresponding path program 3 times [2020-07-21 22:02:54,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:54,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354527721] [2020-07-21 22:02:54,882 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 [2020-07-21 22:02:54,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:02:54,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:54,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 22:02:54,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:55,053 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:02:55,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:55,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:55,791 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 22:02:55,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354527721] [2020-07-21 22:02:55,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:55,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 23 [2020-07-21 22:02:55,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667382389] [2020-07-21 22:02:55,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:02:55,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:55,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:02:55,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:02:55,794 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand 23 states. [2020-07-21 22:02:56,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:56,295 INFO L93 Difference]: Finished difference Result 56 states and 88 transitions. [2020-07-21 22:02:56,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 22:02:56,295 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 42 [2020-07-21 22:02:56,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:56,300 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:02:56,300 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 22:02:56,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=1022, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 22:02:56,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 22:02:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2020-07-21 22:02:56,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:02:56,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 63 transitions. [2020-07-21 22:02:56,317 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 63 transitions. Word has length 42 [2020-07-21 22:02:56,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:56,317 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 63 transitions. [2020-07-21 22:02:56,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:02:56,318 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 63 transitions. [2020-07-21 22:02:56,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-07-21 22:02:56,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:56,321 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:56,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:56,530 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:56,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:56,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1434057987, now seen corresponding path program 4 times [2020-07-21 22:02:56,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:56,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481829055] [2020-07-21 22:02:56,532 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 [2020-07-21 22:02:56,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:02:56,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:56,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:02:56,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:56,647 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 104 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-07-21 22:02:56,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:56,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:57,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:57,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:57,124 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 72 proven. 107 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2020-07-21 22:02:57,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481829055] [2020-07-21 22:02:57,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:57,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:02:57,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208678631] [2020-07-21 22:02:57,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:02:57,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:57,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:02:57,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:02:57,128 INFO L87 Difference]: Start difference. First operand 41 states and 63 transitions. Second operand 13 states. [2020-07-21 22:02:57,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:57,353 INFO L93 Difference]: Finished difference Result 88 states and 151 transitions. [2020-07-21 22:02:57,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:02:57,354 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 83 [2020-07-21 22:02:57,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:57,356 INFO L225 Difference]: With dead ends: 88 [2020-07-21 22:02:57,356 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 22:02:57,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 145 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:02:57,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 22:02:57,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2020-07-21 22:02:57,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:02:57,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2020-07-21 22:02:57,382 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 83 [2020-07-21 22:02:57,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:57,383 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2020-07-21 22:02:57,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:02:57,383 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2020-07-21 22:02:57,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-21 22:02:57,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:57,390 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:57,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:57,591 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:57,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:57,591 INFO L82 PathProgramCache]: Analyzing trace with hash -168777920, now seen corresponding path program 5 times [2020-07-21 22:02:57,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:57,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113853985] [2020-07-21 22:02:57,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:57,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:57,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:57,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:02:57,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:57,739 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 170 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2020-07-21 22:02:57,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:02:58,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:02:58,571 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 106 proven. 182 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-21 22:02:58,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113853985] [2020-07-21 22:02:58,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:02:58,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 22:02:58,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991347661] [2020-07-21 22:02:58,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:02:58,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:02:58,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:02:58,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:02:58,574 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand 17 states. [2020-07-21 22:02:58,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:02:58,937 INFO L93 Difference]: Finished difference Result 106 states and 166 transitions. [2020-07-21 22:02:58,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:02:58,938 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 97 [2020-07-21 22:02:58,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:02:58,940 INFO L225 Difference]: With dead ends: 106 [2020-07-21 22:02:58,940 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 22:02:58,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 169 SyntacticMatches, 13 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=237, Invalid=575, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:02:58,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 22:02:58,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2020-07-21 22:02:58,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 22:02:58,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 85 transitions. [2020-07-21 22:02:58,956 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 85 transitions. Word has length 97 [2020-07-21 22:02:58,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:02:58,957 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 85 transitions. [2020-07-21 22:02:58,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:02:58,957 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 85 transitions. [2020-07-21 22:02:58,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2020-07-21 22:02:58,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:02:58,960 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:02:59,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:59,163 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:02:59,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:02:59,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1072608948, now seen corresponding path program 6 times [2020-07-21 22:02:59,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:02:59,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097854542] [2020-07-21 22:02:59,165 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:02:59,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:02:59,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:02:59,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:02:59,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:02:59,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 418 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2020-07-21 22:02:59,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:00,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:00,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 445 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2020-07-21 22:03:00,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1097854542] [2020-07-21 22:03:00,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:03:00,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 22:03:00,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913605279] [2020-07-21 22:03:00,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:03:00,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:00,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:03:00,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:03:00,794 INFO L87 Difference]: Start difference. First operand 60 states and 85 transitions. Second operand 21 states. [2020-07-21 22:03:01,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:01,329 INFO L93 Difference]: Finished difference Result 130 states and 224 transitions. [2020-07-21 22:03:01,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 22:03:01,330 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 151 [2020-07-21 22:03:01,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:01,332 INFO L225 Difference]: With dead ends: 130 [2020-07-21 22:03:01,332 INFO L226 Difference]: Without dead ends: 79 [2020-07-21 22:03:01,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 265 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=363, Invalid=969, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 22:03:01,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-21 22:03:01,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-21 22:03:01,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 22:03:01,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 98 transitions. [2020-07-21 22:03:01,365 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 98 transitions. Word has length 151 [2020-07-21 22:03:01,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:01,366 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 98 transitions. [2020-07-21 22:03:01,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:03:01,366 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 98 transitions. [2020-07-21 22:03:01,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-07-21 22:03:01,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:03:01,372 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:03:01,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:01,592 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:03:01,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:03:01,593 INFO L82 PathProgramCache]: Analyzing trace with hash 375112636, now seen corresponding path program 7 times [2020-07-21 22:03:01,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:03:01,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201430121] [2020-07-21 22:03:01,593 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:01,685 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:03:01,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:03:01,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-21 22:03:01,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:03:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 258 proven. 604 refuted. 0 times theorem prover too weak. 792 trivial. 0 not checked. [2020-07-21 22:03:02,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:03:03,054 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 22:03:03,194 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 22:03:03,334 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 22:03:03,468 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 22:03:04,082 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 22:03:04,314 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 22:03:04,580 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-21 22:03:04,829 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 146 [2020-07-21 22:03:07,030 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 22:03:07,158 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 22:03:07,317 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 22:03:07,450 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 22:03:08,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:08,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:08,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:08,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:08,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:08,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:09,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:09,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:09,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:09,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:03:10,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 207 proven. 695 refuted. 0 times theorem prover too weak. 752 trivial. 0 not checked. [2020-07-21 22:03:10,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201430121] [2020-07-21 22:03:10,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:03:10,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 35] total 48 [2020-07-21 22:03:10,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339617271] [2020-07-21 22:03:10,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 22:03:10,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:03:10,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 22:03:10,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1962, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 22:03:10,992 INFO L87 Difference]: Start difference. First operand 72 states and 98 transitions. Second operand 48 states. [2020-07-21 22:03:12,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:03:12,451 INFO L93 Difference]: Finished difference Result 96 states and 147 transitions. [2020-07-21 22:03:12,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 22:03:12,452 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 178 [2020-07-21 22:03:12,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:03:12,454 INFO L225 Difference]: With dead ends: 96 [2020-07-21 22:03:12,454 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:03:12,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 268 SyntacticMatches, 41 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=757, Invalid=4499, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 22:03:12,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:03:12,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:03:12,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:03:12,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:03:12,457 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 178 [2020-07-21 22:03:12,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:03:12,457 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:03:12,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 22:03:12,457 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:03:12,457 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:03:12,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:03:12,662 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:03:13,249 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 24 [2020-07-21 22:03:13,252 INFO L268 CegarLoopResult]: For program point fibonacciFINAL(lines 14 22) no Hoare annotation was computed. [2020-07-21 22:03:13,253 INFO L271 CegarLoopResult]: At program point fibonacciENTRY(lines 14 22) the Hoare annotation is: true [2020-07-21 22:03:13,253 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (<= |fibonacci_#in~n| fibonacci_~n) (<= 2 |fibonacci_#in~n|) (<= fibonacci_~n |fibonacci_#in~n|)) [2020-07-21 22:03:13,253 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-07-21 22:03:13,253 INFO L264 CegarLoopResult]: At program point L20-2(line 20) the Hoare annotation is: (let ((.cse0 (<= |fibonacci_#in~n| fibonacci_~n)) (.cse1 (<= fibonacci_~n |fibonacci_#in~n|))) (or (and .cse0 (<= 2 |fibonacci_#t~ret0|) (<= 4 |fibonacci_#in~n|) (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 5)) .cse1) (and (<= 1 |fibonacci_#t~ret0|) .cse0 (<= 2 |fibonacci_#in~n|) (<= |fibonacci_#in~n| 2) .cse1) (and .cse0 (< |fibonacci_#in~n| (+ |fibonacci_#t~ret0| 3)) (<= 3 fibonacci_~n) .cse1))) [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point fibonacciEXIT(lines 14 22) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point L17(lines 17 21) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point L20-3(line 20) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point L15(lines 15 21) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:03:13,254 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:03:13,254 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:03:13,255 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:03:13,255 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 34) no Hoare annotation was computed. [2020-07-21 22:03:13,255 INFO L268 CegarLoopResult]: For program point L31(lines 31 35) no Hoare annotation was computed. [2020-07-21 22:03:13,255 INFO L271 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: true [2020-07-21 22:03:13,255 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 25 36) the Hoare annotation is: true [2020-07-21 22:03:13,255 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-07-21 22:03:13,255 INFO L268 CegarLoopResult]: For program point L27(lines 27 29) no Hoare annotation was computed. [2020-07-21 22:03:13,256 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 25 36) no Hoare annotation was computed. [2020-07-21 22:03:13,256 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 25 36) no Hoare annotation was computed. [2020-07-21 22:03:13,256 INFO L268 CegarLoopResult]: For program point L34(line 34) no Hoare annotation was computed. [2020-07-21 22:03:13,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:03:13 BoogieIcfgContainer [2020-07-21 22:03:13,261 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:03:13,262 INFO L168 Benchmark]: Toolchain (without parser) took 22460.28 ms. Allocated memory was 136.8 MB in the beginning and 423.6 MB in the end (delta: 286.8 MB). Free memory was 101.3 MB in the beginning and 295.4 MB in the end (delta: -194.1 MB). Peak memory consumption was 92.7 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,263 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,266 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.32 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 91.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,267 INFO L168 Benchmark]: Boogie Preprocessor took 26.49 ms. Allocated memory is still 136.8 MB. Free memory was 91.6 MB in the beginning and 90.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,268 INFO L168 Benchmark]: RCFGBuilder took 356.77 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.0 MB in the beginning and 167.9 MB in the end (delta: -77.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,272 INFO L168 Benchmark]: TraceAbstraction took 21800.05 ms. Allocated memory was 200.8 MB in the beginning and 423.6 MB in the end (delta: 222.8 MB). Free memory was 167.2 MB in the beginning and 295.4 MB in the end (delta: -128.2 MB). Peak memory consumption was 94.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:03:13,275 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.32 ms. Allocated memory is still 136.8 MB. Free memory was 100.9 MB in the beginning and 91.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.49 ms. Allocated memory is still 136.8 MB. Free memory was 91.6 MB in the beginning and 90.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 356.77 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 90.0 MB in the beginning and 167.9 MB in the end (delta: -77.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 21800.05 ms. Allocated memory was 200.8 MB in the beginning and 423.6 MB in the end (delta: 222.8 MB). Free memory was 167.2 MB in the beginning and 295.4 MB in the end (delta: -128.2 MB). Peak memory consumption was 94.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: 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, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 21.1s, OverallIterations: 10, TraceHistogramMax: 25, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 195 SDtfs, 526 SDslu, 1034 SDs, 0 SdLazy, 2117 SolverSat, 755 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1381 GetRequests, 1046 SyntacticMatches, 99 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3230 ImplicationChecksByTransitivity, 3.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 39 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 116 PreInvPairs, 180 NumberOfFragments, 66 HoareAnnotationTreeSize, 116 FomulaSimplifications, 694 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 993 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 14.3s InterpolantComputationTime, 676 NumberOfCodeBlocks, 555 NumberOfCodeBlocksAsserted, 33 NumberOfCheckSat, 1279 ConstructedInterpolants, 0 QuantifiedInterpolants, 389804 SizeOfPredicates, 57 NumberOfNonLiveVariables, 1258 ConjunctsInSsa, 166 ConjunctsInUnsatCore, 17 InterpolantComputations, 3 PerfectInterpolantSequences, 4471/7298 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...