/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/mannadiv.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:34:16,606 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:34:16,609 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:34:16,628 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:34:16,629 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:34:16,631 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:34:16,633 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:34:16,644 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:34:16,649 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:34:16,651 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:34:16,653 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:34:16,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:34:16,654 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:34:16,657 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:34:16,658 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:34:16,659 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:34:16,660 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:34:16,661 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:34:16,662 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:34:16,664 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:34:16,665 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:34:16,666 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:34:16,667 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:34:16,668 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:34:16,670 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:34:16,678 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:34:16,679 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:34:16,680 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:34:16,680 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 14:34:16,694 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:34:16,695 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:34:16,696 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:34:16,696 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:34:16,696 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:34:16,697 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:34:16,697 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:34:16,697 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:34:16,697 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:34:16,697 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:34:16,697 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:34:16,698 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:34:16,698 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:34:16,698 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:34:16,698 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:34:16,698 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:34:16,699 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:34:16,699 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:34:16,699 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:34:16,699 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:34:16,699 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:34:16,700 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:34:16,700 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:34:16,700 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:34:16,700 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:34:16,700 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:34:16,701 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:16,701 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:34:16,701 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:34:16,701 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:34:16,987 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:34:17,009 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:34:17,014 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:34:17,015 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:34:17,018 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:34:17,019 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 14:34:17,097 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8fa02b48/13a554df87d94ff6ad1a4789c689bb8d/FLAGbc5aa4bd3 [2020-07-21 14:34:17,607 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:34:17,607 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-21 14:34:17,616 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8fa02b48/13a554df87d94ff6ad1a4789c689bb8d/FLAGbc5aa4bd3 [2020-07-21 14:34:17,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8fa02b48/13a554df87d94ff6ad1a4789c689bb8d [2020-07-21 14:34:17,945 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:34:17,948 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:34:17,950 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:34:17,950 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:34:17,953 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:34:17,955 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:34:17" (1/1) ... [2020-07-21 14:34:17,958 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d966692 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:17, skipping insertion in model container [2020-07-21 14:34:17,958 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:34:17" (1/1) ... [2020-07-21 14:34:17,966 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:34:17,989 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:34:18,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:34:18,174 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:34:18,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:34:18,217 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:34:18,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18 WrapperNode [2020-07-21 14:34:18,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:34:18,219 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:34:18,219 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:34:18,219 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:34:18,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,237 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,237 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,241 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (1/1) ... [2020-07-21 14:34:18,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:34:18,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:34:18,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:34:18,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:34:18,329 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (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 14:34:18,396 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:34:18,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:34:18,397 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:34:18,397 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:34:18,397 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:34:18,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:34:18,397 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:34:18,397 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:34:18,398 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:34:18,398 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:34:18,398 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:34:18,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:34:18,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:34:18,595 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:34:18,596 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:34:18,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:34:18 BoogieIcfgContainer [2020-07-21 14:34:18,600 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:34:18,615 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:34:18,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:34:18,625 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:34:18,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:34:17" (1/3) ... [2020-07-21 14:34:18,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@774c0373 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:34:18, skipping insertion in model container [2020-07-21 14:34:18,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:34:18" (2/3) ... [2020-07-21 14:34:18,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@774c0373 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:34:18, skipping insertion in model container [2020-07-21 14:34:18,633 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:34:18" (3/3) ... [2020-07-21 14:34:18,639 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-21 14:34:18,673 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:34:18,687 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:34:18,715 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:34:18,745 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:34:18,745 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:34:18,745 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:34:18,745 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:34:18,745 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:34:18,746 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:34:18,746 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:34:18,746 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:34:18,764 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 14:34:18,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 14:34:18,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:18,772 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:18,772 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:18,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:18,777 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-21 14:34:18,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:18,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505613431] [2020-07-21 14:34:18,785 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:18,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:18,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:18,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 14:34:18,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:18,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 14:34:18,890 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:34:18,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505613431] [2020-07-21 14:34:18,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:34:18,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 14:34:18,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7308468] [2020-07-21 14:34:18,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 14:34:18,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:18,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 14:34:18,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:34:18,915 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-21 14:34:18,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:18,941 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-21 14:34:18,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 14:34:18,942 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 14:34:18,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:18,953 INFO L225 Difference]: With dead ends: 50 [2020-07-21 14:34:18,954 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 14:34:18,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:34:18,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 14:34:18,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 14:34:18,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 14:34:18,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-21 14:34:18,993 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-21 14:34:18,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:18,993 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-21 14:34:18,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 14:34:18,994 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-21 14:34:18,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 14:34:18,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:18,996 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:19,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:19,211 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:19,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:19,212 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-21 14:34:19,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:19,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339745652] [2020-07-21 14:34:19,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:19,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:19,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:19,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 14:34:19,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:19,401 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 14:34:19,402 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:34:19,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339745652] [2020-07-21 14:34:19,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:34:19,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 14:34:19,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350856417] [2020-07-21 14:34:19,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:34:19,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:19,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:34:19,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:34:19,410 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-21 14:34:19,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:19,586 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-21 14:34:19,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:34:19,589 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-21 14:34:19,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:19,591 INFO L225 Difference]: With dead ends: 34 [2020-07-21 14:34:19,591 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 14:34:19,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:34:19,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 14:34:19,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-21 14:34:19,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 14:34:19,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 14:34:19,617 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-21 14:34:19,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:19,623 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 14:34:19,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:34:19,623 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 14:34:19,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 14:34:19,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:19,626 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:19,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:19,841 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:19,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:19,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-21 14:34:19,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:19,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275674971] [2020-07-21 14:34:19,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:19,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:19,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:19,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 14:34:19,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:19,961 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 14:34:19,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:19,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:20,060 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 14:34:20,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:20,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:20,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 14:34:20,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275674971] [2020-07-21 14:34:20,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:20,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-21 14:34:20,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304338413] [2020-07-21 14:34:20,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 14:34:20,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:20,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 14:34:20,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:34:20,129 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-21 14:34:22,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:22,289 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-21 14:34:22,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:34:22,290 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 14:34:22,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:22,293 INFO L225 Difference]: With dead ends: 37 [2020-07-21 14:34:22,293 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 14:34:22,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-21 14:34:22,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 14:34:22,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-21 14:34:22,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 14:34:22,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-21 14:34:22,301 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-21 14:34:22,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:22,302 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-21 14:34:22,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 14:34:22,302 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-21 14:34:22,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 14:34:22,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:22,303 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:22,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:22,507 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:22,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:22,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-21 14:34:22,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:22,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708523206] [2020-07-21 14:34:22,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:22,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:22,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:22,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:34:22,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:22,607 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 14:34:22,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:22,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 14:34:22,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708523206] [2020-07-21 14:34:22,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:22,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 14:34:22,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183479791] [2020-07-21 14:34:22,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:34:22,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:22,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:34:22,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:34:22,713 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-21 14:34:26,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:26,989 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-21 14:34:26,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:34:26,992 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 14:34:26,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:26,993 INFO L225 Difference]: With dead ends: 72 [2020-07-21 14:34:26,994 INFO L226 Difference]: Without dead ends: 56 [2020-07-21 14:34:26,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:34:26,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-21 14:34:27,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-21 14:34:27,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 14:34:27,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-21 14:34:27,011 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-21 14:34:27,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:27,012 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-21 14:34:27,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:34:27,012 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-21 14:34:27,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 14:34:27,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:27,014 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:27,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:27,227 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:27,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:27,228 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-21 14:34:27,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:27,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497476752] [2020-07-21 14:34:27,229 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:27,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:27,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:27,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 14:34:27,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:27,309 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 14:34:27,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:27,354 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 14:34:27,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497476752] [2020-07-21 14:34:27,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:27,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-21 14:34:27,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834036394] [2020-07-21 14:34:27,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:34:27,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:27,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:34:27,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:34:27,357 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-21 14:34:27,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:27,447 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 14:34:27,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 14:34:27,449 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-21 14:34:27,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:27,451 INFO L225 Difference]: With dead ends: 86 [2020-07-21 14:34:27,451 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 14:34:27,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-21 14:34:27,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 14:34:27,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 14:34:27,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 14:34:27,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-21 14:34:27,468 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-21 14:34:27,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:27,469 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-21 14:34:27,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:34:27,469 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-21 14:34:27,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 14:34:27,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:27,471 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:27,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:27,686 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:27,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:27,687 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-21 14:34:27,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:27,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785875552] [2020-07-21 14:34:27,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:27,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:27,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:27,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 14:34:27,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:27,831 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 14:34:27,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:27,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:28,066 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 14:34:28,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785875552] [2020-07-21 14:34:28,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:28,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 14:34:28,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53717713] [2020-07-21 14:34:28,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:34:28,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:28,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:34:28,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:34:28,071 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-21 14:34:39,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:39,142 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-21 14:34:39,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:34:39,167 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-21 14:34:39,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:39,169 INFO L225 Difference]: With dead ends: 124 [2020-07-21 14:34:39,169 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 14:34:39,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:34:39,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 14:34:39,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-21 14:34:39,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 14:34:39,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-21 14:34:39,200 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-21 14:34:39,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:39,200 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-21 14:34:39,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:34:39,202 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-21 14:34:39,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 14:34:39,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:39,206 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:39,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:39,407 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:39,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:39,407 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-21 14:34:39,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:39,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138528414] [2020-07-21 14:34:39,409 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:39,452 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:39,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:39,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 14:34:39,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:39,626 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 14:34:39,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:39,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:40,059 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 14:34:40,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138528414] [2020-07-21 14:34:40,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:40,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 14:34:40,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094116184] [2020-07-21 14:34:40,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 14:34:40,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:40,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 14:34:40,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:34:40,061 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-21 14:34:40,361 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-21 14:34:40,573 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:34:43,144 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-21 14:34:43,473 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-21 14:34:43,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:43,530 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-21 14:34:43,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 14:34:43,534 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-21 14:34:43,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:43,536 INFO L225 Difference]: With dead ends: 156 [2020-07-21 14:34:43,536 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 14:34:43,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-21 14:34:43,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 14:34:43,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-21 14:34:43,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 14:34:43,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-21 14:34:43,569 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-21 14:34:43,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:43,570 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-21 14:34:43,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 14:34:43,574 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-21 14:34:43,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 14:34:43,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:43,576 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:43,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:43,777 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:43,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:43,778 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-21 14:34:43,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:43,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1161234781] [2020-07-21 14:34:43,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:34:43,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:43,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:43,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:34:43,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 14:34:43,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:44,011 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 14:34:44,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1161234781] [2020-07-21 14:34:44,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:44,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 14:34:44,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306897947] [2020-07-21 14:34:44,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 14:34:44,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:44,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 14:34:44,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:34:44,014 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 10 states. [2020-07-21 14:34:44,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:44,154 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-21 14:34:44,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 14:34:44,156 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-21 14:34:44,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:44,158 INFO L225 Difference]: With dead ends: 148 [2020-07-21 14:34:44,158 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 14:34:44,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:34:44,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 14:34:44,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 14:34:44,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 14:34:44,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-21 14:34:44,179 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-21 14:34:44,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:44,179 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-21 14:34:44,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 14:34:44,180 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-21 14:34:44,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 14:34:44,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:44,181 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:44,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:44,386 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:44,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:44,386 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-21 14:34:44,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:44,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103398261] [2020-07-21 14:34:44,387 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:34:44,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:44,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:44,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:34:44,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:44,474 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 14:34:44,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:44,542 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-21 14:34:44,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103398261] [2020-07-21 14:34:44,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:44,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 14:34:44,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331643621] [2020-07-21 14:34:44,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 14:34:44,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:44,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 14:34:44,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 14:34:44,544 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-21 14:34:44,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:44,845 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-21 14:34:44,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 14:34:44,848 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-21 14:34:44,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:44,851 INFO L225 Difference]: With dead ends: 134 [2020-07-21 14:34:44,851 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 14:34:44,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:34:44,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 14:34:44,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 14:34:44,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 14:34:44,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-21 14:34:44,882 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-21 14:34:44,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:44,883 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-21 14:34:44,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 14:34:44,884 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-21 14:34:44,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 14:34:44,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:44,885 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:45,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:45,089 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:45,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:45,090 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-21 14:34:45,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:45,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484182667] [2020-07-21 14:34:45,091 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 14:34:45,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:45,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:45,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 14:34:45,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 14:34:45,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:45,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:46,577 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 14:34:46,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484182667] [2020-07-21 14:34:46,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:46,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-21 14:34:46,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786396121] [2020-07-21 14:34:46,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 14:34:46,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:46,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 14:34:46,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:34:46,580 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-21 14:34:47,530 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 14:34:48,163 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 14:34:48,445 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:34:50,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:50,659 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-21 14:34:50,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 14:34:50,660 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-21 14:34:50,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:50,662 INFO L225 Difference]: With dead ends: 140 [2020-07-21 14:34:50,662 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 14:34:50,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:34:50,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 14:34:50,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-21 14:34:50,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 14:34:50,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-21 14:34:50,688 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-21 14:34:50,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:50,688 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-21 14:34:50,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 14:34:50,688 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-21 14:34:50,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 14:34:50,689 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:50,690 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:50,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:50,903 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:50,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:50,904 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-21 14:34:50,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:50,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029577221] [2020-07-21 14:34:50,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:50,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:50,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:50,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:34:50,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:51,027 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 14:34:51,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:51,141 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 14:34:51,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029577221] [2020-07-21 14:34:51,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:51,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-21 14:34:51,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860608153] [2020-07-21 14:34:51,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 14:34:51,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:51,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 14:34:51,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-21 14:34:51,144 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-21 14:34:51,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:51,381 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-21 14:34:51,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 14:34:51,389 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-21 14:34:51,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:51,391 INFO L225 Difference]: With dead ends: 148 [2020-07-21 14:34:51,391 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 14:34:51,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:34:51,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 14:34:51,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-21 14:34:51,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 14:34:51,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-21 14:34:51,406 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-21 14:34:51,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:51,407 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-21 14:34:51,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 14:34:51,407 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-21 14:34:51,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-21 14:34:51,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:51,408 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:51,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:51,625 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:51,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:51,626 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-21 14:34:51,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:51,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516733409] [2020-07-21 14:34:51,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:51,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:34:51,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:51,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:34:51,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:51,758 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 14:34:51,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:51,888 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 14:34:51,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516733409] [2020-07-21 14:34:51,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:51,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 14:34:51,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402520170] [2020-07-21 14:34:51,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:34:51,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:51,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:34:51,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:34:51,891 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-21 14:34:52,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:34:52,254 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-21 14:34:52,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 14:34:52,256 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-21 14:34:52,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:34:52,258 INFO L225 Difference]: With dead ends: 138 [2020-07-21 14:34:52,258 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 14:34:52,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:34:52,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 14:34:52,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-21 14:34:52,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 14:34:52,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-21 14:34:52,273 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-21 14:34:52,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:34:52,273 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-21 14:34:52,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:34:52,274 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-21 14:34:52,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 14:34:52,275 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:34:52,275 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:34:52,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:52,489 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:34:52,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:34:52,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-21 14:34:52,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:34:52,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1863748481] [2020-07-21 14:34:52,490 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:34:52,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:34:52,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:34:52,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 14:34:52,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:34:53,361 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 14:34:53,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:34:53,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:34:55,823 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 14:34:55,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1863748481] [2020-07-21 14:34:55,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:34:55,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 14:34:55,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440932350] [2020-07-21 14:34:55,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 14:34:55,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:34:55,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 14:34:55,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:34:55,826 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-21 14:35:06,353 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-21 14:35:08,492 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 14:35:11,077 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:35:12,078 WARN L193 SmtUtils]: Spent 674.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-21 14:35:37,093 WARN L193 SmtUtils]: Spent 3.63 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 14:35:56,101 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_main_~x1~0 2)) (.cse1 (* c_main_~y1~0 c_main_~x2~0))) (and (= .cse0 (+ c_main_~x2~0 c_main_~y3~0 .cse1)) (= (+ (* 2 c_main_~y2~0) (* 2 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) .cse0) (= (+ c_main_~y2~0 c_main_~y3~0 .cse1) c_main_~x1~0))) is different from false [2020-07-21 14:35:58,801 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-21 14:36:05,691 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:36:12,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:36:12,905 INFO L93 Difference]: Finished difference Result 236 states and 280 transitions. [2020-07-21 14:36:12,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 14:36:12,912 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-21 14:36:12,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:36:12,913 INFO L225 Difference]: With dead ends: 236 [2020-07-21 14:36:12,914 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 14:36:12,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 45.2s TimeCoverageRelationStatistics Valid=124, Invalid=996, Unknown=6, NotChecked=64, Total=1190 [2020-07-21 14:36:12,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 14:36:12,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-21 14:36:12,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 14:36:12,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2020-07-21 14:36:12,934 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 85 [2020-07-21 14:36:12,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:36:12,935 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2020-07-21 14:36:12,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 14:36:12,935 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2020-07-21 14:36:12,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 14:36:12,936 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:36:12,936 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:36:13,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:13,137 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:36:13,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:36:13,138 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-21 14:36:13,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:36:13,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827384831] [2020-07-21 14:36:13,139 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:13,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:36:13,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:36:13,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 14:36:13,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:36:14,182 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:14,539 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:14,940 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:15,788 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 14:36:15,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:36:16,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:36:20,494 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:36:26,394 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 14:36:26,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827384831] [2020-07-21 14:36:26,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:36:26,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-21 14:36:26,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602166639] [2020-07-21 14:36:26,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:36:26,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:36:26,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:36:26,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:36:26,397 INFO L87 Difference]: Start difference. First operand 200 states and 237 transitions. Second operand 24 states. [2020-07-21 14:36:29,184 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-21 14:36:31,889 WARN L193 SmtUtils]: Spent 1.87 s on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-21 14:36:32,939 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:36:37,056 WARN L193 SmtUtils]: Spent 436.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-21 14:36:38,950 WARN L193 SmtUtils]: Spent 882.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-21 14:36:40,423 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-21 14:36:44,923 WARN L193 SmtUtils]: Spent 3.34 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-21 14:36:47,066 WARN L193 SmtUtils]: Spent 586.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 14:36:48,760 WARN L193 SmtUtils]: Spent 603.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-21 14:36:48,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:36:48,990 INFO L93 Difference]: Finished difference Result 224 states and 258 transitions. [2020-07-21 14:36:48,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 14:36:49,000 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-21 14:36:49,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:36:49,002 INFO L225 Difference]: With dead ends: 224 [2020-07-21 14:36:49,002 INFO L226 Difference]: Without dead ends: 166 [2020-07-21 14:36:49,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:36:49,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-21 14:36:49,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2020-07-21 14:36:49,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-21 14:36:49,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2020-07-21 14:36:49,032 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 93 [2020-07-21 14:36:49,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:36:49,032 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2020-07-21 14:36:49,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:36:49,032 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2020-07-21 14:36:49,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 14:36:49,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:36:49,034 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:36:49,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:49,235 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:36:49,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:36:49,236 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-21 14:36:49,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:36:49,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872103371] [2020-07-21 14:36:49,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:49,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:36:49,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:36:49,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:36:49,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:36:49,383 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 14:36:49,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:36:49,531 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-21 14:36:49,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872103371] [2020-07-21 14:36:49,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:36:49,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-21 14:36:49,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917225995] [2020-07-21 14:36:49,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:36:49,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:36:49,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:36:49,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:36:49,533 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 15 states. [2020-07-21 14:36:50,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:36:50,070 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2020-07-21 14:36:50,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 14:36:50,076 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-21 14:36:50,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:36:50,078 INFO L225 Difference]: With dead ends: 220 [2020-07-21 14:36:50,078 INFO L226 Difference]: Without dead ends: 194 [2020-07-21 14:36:50,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:36:50,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-21 14:36:50,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-21 14:36:50,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-21 14:36:50,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 230 transitions. [2020-07-21 14:36:50,104 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 230 transitions. Word has length 93 [2020-07-21 14:36:50,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:36:50,105 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 230 transitions. [2020-07-21 14:36:50,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:36:50,106 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 230 transitions. [2020-07-21 14:36:50,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-21 14:36:50,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:36:50,108 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:36:50,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:50,323 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:36:50,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:36:50,323 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-21 14:36:50,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:36:50,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790891421] [2020-07-21 14:36:50,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:36:50,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:36:50,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:36:50,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-21 14:36:50,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:36:51,384 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:51,787 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:52,219 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:52,704 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:36:53,456 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 14:36:54,150 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 14:36:54,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:36:54,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:37:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 14:37:09,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790891421] [2020-07-21 14:37:09,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:37:09,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-21 14:37:09,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866798525] [2020-07-21 14:37:09,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:37:09,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:37:09,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:37:09,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:37:09,146 INFO L87 Difference]: Start difference. First operand 194 states and 230 transitions. Second operand 26 states. [2020-07-21 14:37:37,015 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:37:38,624 WARN L193 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 14:37:39,853 WARN L193 SmtUtils]: Spent 428.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 14:38:01,658 WARN L193 SmtUtils]: Spent 456.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 14:38:10,433 WARN L193 SmtUtils]: Spent 489.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:38:13,088 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ (* 2 c_main_~y2~0) (* 4 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 1)) (= (+ c_main_~x1~0 4) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 14:38:21,912 WARN L193 SmtUtils]: Spent 839.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 14:38:29,933 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:38:44,900 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:38:55,155 WARN L193 SmtUtils]: Spent 949.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:39:17,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:39:17,595 INFO L93 Difference]: Finished difference Result 340 states and 402 transitions. [2020-07-21 14:39:17,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 14:39:17,602 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-21 14:39:17,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:39:17,604 INFO L225 Difference]: With dead ends: 340 [2020-07-21 14:39:17,604 INFO L226 Difference]: Without dead ends: 302 [2020-07-21 14:39:17,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 78.3s TimeCoverageRelationStatistics Valid=149, Invalid=1486, Unknown=9, NotChecked=78, Total=1722 [2020-07-21 14:39:17,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-21 14:39:17,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2020-07-21 14:39:17,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 14:39:17,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 356 transitions. [2020-07-21 14:39:17,631 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 356 transitions. Word has length 101 [2020-07-21 14:39:17,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:39:17,632 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 356 transitions. [2020-07-21 14:39:17,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:39:17,632 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 356 transitions. [2020-07-21 14:39:17,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 14:39:17,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:39:17,634 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:39:17,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:39:17,844 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:39:17,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:39:17,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-21 14:39:17,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:39:17,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536714122] [2020-07-21 14:39:17,845 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:39:17,891 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:39:17,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:39:17,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:39:17,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:39:18,041 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 14:39:18,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:39:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 14:39:18,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536714122] [2020-07-21 14:39:18,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:39:18,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-21 14:39:18,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019150423] [2020-07-21 14:39:18,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 14:39:18,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:39:18,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 14:39:18,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:39:18,254 INFO L87 Difference]: Start difference. First operand 302 states and 356 transitions. Second operand 18 states. [2020-07-21 14:39:20,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:39:20,175 INFO L93 Difference]: Finished difference Result 368 states and 440 transitions. [2020-07-21 14:39:20,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 14:39:20,181 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-21 14:39:20,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:39:20,185 INFO L225 Difference]: With dead ends: 368 [2020-07-21 14:39:20,186 INFO L226 Difference]: Without dead ends: 338 [2020-07-21 14:39:20,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:39:20,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-21 14:39:20,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 338. [2020-07-21 14:39:20,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-21 14:39:20,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 404 transitions. [2020-07-21 14:39:20,225 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 404 transitions. Word has length 109 [2020-07-21 14:39:20,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:39:20,226 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 404 transitions. [2020-07-21 14:39:20,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 14:39:20,226 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 404 transitions. [2020-07-21 14:39:20,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 14:39:20,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:39:20,229 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:39:20,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:39:20,443 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:39:20,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:39:20,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-21 14:39:20,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:39:20,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79790025] [2020-07-21 14:39:20,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:39:20,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:39:20,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:39:20,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 14:39:20,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:39:22,143 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:39:22,731 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:39:23,380 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:39:24,108 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:39:24,906 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:39:26,034 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 14:39:27,209 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 14:39:27,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:39:28,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:39:39,214 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 14:39:55,718 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 14:39:55,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79790025] [2020-07-21 14:39:55,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:39:55,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-21 14:39:55,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718518276] [2020-07-21 14:39:55,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 14:39:55,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:39:55,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 14:39:55,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:39:55,720 INFO L87 Difference]: Start difference. First operand 338 states and 404 transitions. Second operand 30 states. [2020-07-21 14:40:31,136 WARN L193 SmtUtils]: Spent 5.02 s on a formula simplification that was a NOOP. DAG size: 22 [2020-07-21 14:41:04,039 WARN L193 SmtUtils]: Spent 4.12 s on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 14:41:20,969 WARN L193 SmtUtils]: Spent 513.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 14:41:47,252 WARN L193 SmtUtils]: Spent 526.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:42:53,477 WARN L193 SmtUtils]: Spent 572.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 14:42:56,146 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-21 14:42:59,155 WARN L193 SmtUtils]: Spent 625.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-21 14:43:02,038 WARN L193 SmtUtils]: Spent 960.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 14:43:16,392 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 14:43:29,604 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 14:43:44,508 WARN L193 SmtUtils]: Spent 731.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-21 14:44:00,608 WARN L193 SmtUtils]: Spent 675.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-21 14:44:03,841 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 5) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-21 14:44:13,388 WARN L193 SmtUtils]: Spent 1.18 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 14:44:31,917 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:44:58,921 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-21 14:45:16,078 WARN L193 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:45:30,611 WARN L193 SmtUtils]: Spent 714.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 14:45:45,024 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 14:46:03,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:46:03,803 INFO L93 Difference]: Finished difference Result 512 states and 613 transitions. [2020-07-21 14:46:03,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 14:46:03,813 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-21 14:46:03,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:46:03,816 INFO L225 Difference]: With dead ends: 512 [2020-07-21 14:46:03,816 INFO L226 Difference]: Without dead ends: 470 [2020-07-21 14:46:03,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 221.9s TimeCoverageRelationStatistics Valid=199, Invalid=2543, Unknown=18, NotChecked=102, Total=2862 [2020-07-21 14:46:03,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-21 14:46:03,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 470. [2020-07-21 14:46:03,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-07-21 14:46:03,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 562 transitions. [2020-07-21 14:46:03,860 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 562 transitions. Word has length 117 [2020-07-21 14:46:03,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:46:03,861 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 562 transitions. [2020-07-21 14:46:03,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 14:46:03,861 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 562 transitions. [2020-07-21 14:46:03,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 14:46:03,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:46:03,864 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:46:04,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:04,079 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:46:04,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:46:04,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1353613609, now seen corresponding path program 14 times [2020-07-21 14:46:04,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:46:04,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452663619] [2020-07-21 14:46:04,080 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:04,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:46:04,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:46:04,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:46:04,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:46:04,270 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 172 proven. 168 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 14:46:04,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:46:04,508 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 92 proven. 248 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 14:46:04,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452663619] [2020-07-21 14:46:04,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:46:04,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 14:46:04,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778717431] [2020-07-21 14:46:04,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 14:46:04,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:46:04,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 14:46:04,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:46:04,510 INFO L87 Difference]: Start difference. First operand 470 states and 562 transitions. Second operand 17 states. [2020-07-21 14:46:07,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:46:07,237 INFO L93 Difference]: Finished difference Result 532 states and 639 transitions. [2020-07-21 14:46:07,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 14:46:07,246 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 125 [2020-07-21 14:46:07,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:46:07,249 INFO L225 Difference]: With dead ends: 532 [2020-07-21 14:46:07,249 INFO L226 Difference]: Without dead ends: 454 [2020-07-21 14:46:07,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2020-07-21 14:46:07,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-21 14:46:07,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 452. [2020-07-21 14:46:07,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-21 14:46:07,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 533 transitions. [2020-07-21 14:46:07,295 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 533 transitions. Word has length 125 [2020-07-21 14:46:07,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:46:07,298 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 533 transitions. [2020-07-21 14:46:07,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 14:46:07,298 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 533 transitions. [2020-07-21 14:46:07,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 14:46:07,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:46:07,300 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:46:07,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:07,514 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:46:07,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:46:07,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 15 times [2020-07-21 14:46:07,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:46:07,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1432143897] [2020-07-21 14:46:07,516 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:07,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:46:07,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:46:07,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:46:07,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:46:07,768 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 14:46:07,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:46:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-21 14:46:08,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1432143897] [2020-07-21 14:46:08,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:46:08,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-21 14:46:08,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870540509] [2020-07-21 14:46:08,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 14:46:08,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:46:08,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 14:46:08,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-21 14:46:08,117 INFO L87 Difference]: Start difference. First operand 452 states and 533 transitions. Second operand 21 states. [2020-07-21 14:46:14,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:46:14,250 INFO L93 Difference]: Finished difference Result 526 states and 627 transitions. [2020-07-21 14:46:14,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 14:46:14,263 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-21 14:46:14,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:46:14,266 INFO L225 Difference]: With dead ends: 526 [2020-07-21 14:46:14,266 INFO L226 Difference]: Without dead ends: 492 [2020-07-21 14:46:14,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 14:46:14,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2020-07-21 14:46:14,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 492. [2020-07-21 14:46:14,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-21 14:46:14,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 586 transitions. [2020-07-21 14:46:14,320 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 586 transitions. Word has length 125 [2020-07-21 14:46:14,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:46:14,321 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 586 transitions. [2020-07-21 14:46:14,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 14:46:14,321 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 586 transitions. [2020-07-21 14:46:14,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 14:46:14,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:46:14,323 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:46:14,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:14,538 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:46:14,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:46:14,541 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 16 times [2020-07-21 14:46:14,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:46:14,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176918988] [2020-07-21 14:46:14,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:46:14,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:46:14,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:46:14,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-21 14:46:14,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:46:14,903 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:15,199 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:15,519 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:15,872 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:16,286 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:16,748 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 14:46:17,664 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:18,671 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:19,770 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:20,980 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:22,239 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:23,630 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-21 14:46:25,696 WARN L193 SmtUtils]: Spent 486.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 14:46:27,859 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 14:46:27,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:46:30,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:46:54,743 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2020-07-21 14:47:27,963 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 14:47:27,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176918988] [2020-07-21 14:47:27,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:47:27,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-21 14:47:27,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561687095] [2020-07-21 14:47:27,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 14:47:27,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:47:27,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 14:47:27,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1033, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:47:27,965 INFO L87 Difference]: Start difference. First operand 492 states and 586 transitions. Second operand 34 states. [2020-07-21 14:47:42,073 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 14:48:11,807 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 13