/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:59:59,698 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:59:59,700 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:59:59,712 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:59:59,713 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:59:59,714 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:59:59,716 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:59:59,718 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:59:59,721 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:59:59,722 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:59:59,724 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:59:59,726 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:59:59,726 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:59:59,727 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:59:59,729 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:59:59,731 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:59:59,732 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:59:59,733 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:59:59,736 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:59:59,739 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:59:59,742 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:59:59,743 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:59:59,745 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:59:59,746 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:59:59,750 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 00:59:59,750 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 00:59:59,751 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 00:59:59,752 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 00:59:59,755 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 00:59:59,756 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 00:59:59,757 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 00:59:59,758 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 00:59:59,759 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 00:59:59,760 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 00:59:59,762 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 00:59:59,762 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 00:59:59,763 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 00:59:59,764 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 00:59:59,764 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 00:59:59,765 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 00:59:59,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 00:59:59,768 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 00:59:59,786 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:59:59,786 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:59:59,788 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:59:59,788 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:59:59,788 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:59:59,789 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:59:59,789 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:59:59,789 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:59:59,789 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:59:59,790 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:59:59,790 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:59:59,790 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:59:59,790 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:59:59,791 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:59:59,791 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:59:59,791 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:59:59,791 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:59:59,791 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:59:59,792 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:59:59,792 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:59:59,792 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:59:59,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:59:59,792 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:59:59,793 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:59:59,794 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:00:00,142 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:00:00,160 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:00:00,165 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:00:00,166 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:00:00,167 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:00:00,168 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-21 01:00:00,254 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fbeab7d4/9578538245ee49b8a29a5f650388e840/FLAG7bbd6b0ff [2020-07-21 01:00:00,840 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:00:00,841 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_10x0-2.c [2020-07-21 01:00:00,853 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fbeab7d4/9578538245ee49b8a29a5f650388e840/FLAG7bbd6b0ff [2020-07-21 01:00:01,144 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8fbeab7d4/9578538245ee49b8a29a5f650388e840 [2020-07-21 01:00:01,155 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:00:01,158 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:00:01,160 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:00:01,160 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:00:01,164 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:00:01,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,170 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56647c13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01, skipping insertion in model container [2020-07-21 01:00:01,170 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,180 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:00:01,199 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:00:01,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:00:01,387 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:00:01,406 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:00:01,423 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:00:01,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01 WrapperNode [2020-07-21 01:00:01,424 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:00:01,425 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:00:01,426 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:00:01,426 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:00:01,444 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,450 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,450 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,454 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,456 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,457 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (1/1) ... [2020-07-21 01:00:01,459 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:00:01,459 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:00:01,459 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:00:01,459 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:00:01,460 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (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 01:00:01,639 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:00:01,639 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:00:01,639 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 01:00:01,639 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:00:01,639 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:00:01,641 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 01:00:01,641 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:00:01,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:00:01,643 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:00:01,861 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:00:01,861 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 01:00:01,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:00:01 BoogieIcfgContainer [2020-07-21 01:00:01,867 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:00:01,882 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:00:01,883 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:00:01,894 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:00:01,898 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:00:01" (1/3) ... [2020-07-21 01:00:01,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca28350 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:00:01, skipping insertion in model container [2020-07-21 01:00:01,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:00:01" (2/3) ... [2020-07-21 01:00:01,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ca28350 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:00:01, skipping insertion in model container [2020-07-21 01:00:01,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:00:01" (3/3) ... [2020-07-21 01:00:01,917 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-2.c [2020-07-21 01:00:01,951 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:00:01,976 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:00:01,998 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:00:02,028 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:00:02,028 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:00:02,028 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:00:02,029 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:00:02,029 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:00:02,029 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:00:02,029 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:00:02,030 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:00:02,052 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 01:00:02,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 01:00:02,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:02,064 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:02,065 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:02,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:02,072 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 01:00:02,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:02,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320871549] [2020-07-21 01:00:02,086 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 01:00:02,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:02,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:02,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:00:02,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:02,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:00:02,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:00:02,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320871549] [2020-07-21 01:00:02,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:00:02,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:00:02,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403174934] [2020-07-21 01:00:02,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:00:02,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:02,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:00:02,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:00:02,324 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 01:00:02,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:02,440 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 01:00:02,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:00:02,443 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 01:00:02,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:02,457 INFO L225 Difference]: With dead ends: 30 [2020-07-21 01:00:02,458 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 01:00:02,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:00:02,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 01:00:02,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 01:00:02,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 01:00:02,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 01:00:02,526 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 01:00:02,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:02,527 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 01:00:02,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:00:02,527 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 01:00:02,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:00:02,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:02,531 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:02,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:02,746 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:02,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:02,748 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 01:00:02,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:02,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370813016] [2020-07-21 01:00:02,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:02,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:02,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:02,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 01:00:02,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:02,858 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 01:00:02,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:03,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 01:00:03,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370813016] [2020-07-21 01:00:03,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:03,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 01:00:03,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644517692] [2020-07-21 01:00:03,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 01:00:03,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:03,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 01:00:03,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 01:00:03,134 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 01:00:03,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:03,233 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 01:00:03,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:00:03,235 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 01:00:03,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:03,236 INFO L225 Difference]: With dead ends: 25 [2020-07-21 01:00:03,236 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 01:00:03,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:00:03,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 01:00:03,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 01:00:03,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 01:00:03,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 01:00:03,247 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 01:00:03,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:03,247 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 01:00:03,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 01:00:03,248 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 01:00:03,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:00:03,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:03,250 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:03,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:03,466 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:03,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:03,467 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 01:00:03,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:03,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716023685] [2020-07-21 01:00:03,469 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:03,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:03,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:03,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:00:03,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:03,623 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 01:00:03,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:03,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:03,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:04,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:04,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:04,091 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 01:00:04,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716023685] [2020-07-21 01:00:04,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:04,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 01:00:04,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585999132] [2020-07-21 01:00:04,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 01:00:04,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:04,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 01:00:04,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 01:00:04,102 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 01:00:04,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:04,228 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 01:00:04,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 01:00:04,230 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 01:00:04,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:04,232 INFO L225 Difference]: With dead ends: 28 [2020-07-21 01:00:04,233 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 01:00:04,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:00:04,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 01:00:04,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 01:00:04,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 01:00:04,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 01:00:04,256 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 01:00:04,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:04,258 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 01:00:04,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 01:00:04,259 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 01:00:04,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:00:04,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:04,260 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:04,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:04,475 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:04,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:04,476 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-21 01:00:04,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:04,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118987445] [2020-07-21 01:00:04,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:04,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:04,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:04,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 01:00:04,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:04,597 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 01:00:04,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:05,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:05,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:05,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:05,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:05,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:05,282 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 01:00:05,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118987445] [2020-07-21 01:00:05,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:05,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 01:00:05,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662363858] [2020-07-21 01:00:05,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 01:00:05,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:05,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 01:00:05,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 01:00:05,286 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 01:00:05,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:05,410 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 01:00:05,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:00:05,413 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 01:00:05,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:05,414 INFO L225 Difference]: With dead ends: 31 [2020-07-21 01:00:05,416 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 01:00:05,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:00:05,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 01:00:05,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 01:00:05,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 01:00:05,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 01:00:05,427 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 01:00:05,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:05,428 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 01:00:05,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 01:00:05,428 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 01:00:05,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 01:00:05,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:05,430 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:05,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:05,639 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:05,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:05,640 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-07-21 01:00:05,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:05,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570392317] [2020-07-21 01:00:05,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:05,691 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:05,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:05,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:00:05,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:05,770 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 01:00:05,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:06,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:06,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:06,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:06,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:06,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:06,730 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 01:00:06,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570392317] [2020-07-21 01:00:06,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:06,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 01:00:06,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25904821] [2020-07-21 01:00:06,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 01:00:06,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:06,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 01:00:06,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:00:06,734 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 01:00:06,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:06,886 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 01:00:06,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 01:00:06,891 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 01:00:06,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:06,893 INFO L225 Difference]: With dead ends: 34 [2020-07-21 01:00:06,893 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 01:00:06,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 01:00:06,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 01:00:06,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 01:00:06,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 01:00:06,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 01:00:06,902 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 01:00:06,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:06,902 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 01:00:06,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 01:00:06,903 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 01:00:06,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 01:00:06,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:06,905 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:07,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:07,112 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:07,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:07,113 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-07-21 01:00:07,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:07,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590283331] [2020-07-21 01:00:07,114 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:07,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:07,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:07,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:00:07,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:07,266 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 01:00:07,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:08,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:08,785 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 01:00:08,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590283331] [2020-07-21 01:00:08,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:08,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 01:00:08,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613555575] [2020-07-21 01:00:08,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 01:00:08,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:08,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 01:00:08,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 01:00:08,795 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 01:00:08,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:08,972 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 01:00:08,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 01:00:08,973 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 01:00:08,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:08,974 INFO L225 Difference]: With dead ends: 37 [2020-07-21 01:00:08,974 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 01:00:08,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:00:08,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 01:00:08,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 01:00:08,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 01:00:08,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 01:00:08,984 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 01:00:08,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:08,984 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 01:00:08,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 01:00:08,985 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 01:00:08,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 01:00:08,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:08,987 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:09,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:09,200 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:09,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:09,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-07-21 01:00:09,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:09,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180230772] [2020-07-21 01:00:09,203 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:09,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:09,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:09,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 01:00:09,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:09,364 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 01:00:09,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:10,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:10,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:10,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:11,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:11,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:11,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:11,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:11,549 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 01:00:11,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180230772] [2020-07-21 01:00:11,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:11,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 01:00:11,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570422789] [2020-07-21 01:00:11,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 01:00:11,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:11,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 01:00:11,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 01:00:11,554 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 01:00:11,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:11,752 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 01:00:11,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 01:00:11,753 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 01:00:11,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:11,754 INFO L225 Difference]: With dead ends: 40 [2020-07-21 01:00:11,755 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 01:00:11,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:00:11,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 01:00:11,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 01:00:11,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 01:00:11,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 01:00:11,764 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 01:00:11,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:11,764 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 01:00:11,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 01:00:11,764 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 01:00:11,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 01:00:11,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:11,767 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:11,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:11,974 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:11,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:11,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-07-21 01:00:11,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:11,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210546753] [2020-07-21 01:00:11,977 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:12,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:12,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:12,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 01:00:12,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:12,174 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 01:00:12,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:13,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:14,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:14,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:14,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:15,323 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 01:00:15,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210546753] [2020-07-21 01:00:15,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:15,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 01:00:15,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741605413] [2020-07-21 01:00:15,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 01:00:15,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:15,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 01:00:15,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 01:00:15,326 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 01:00:15,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:15,574 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 01:00:15,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 01:00:15,577 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 01:00:15,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:15,579 INFO L225 Difference]: With dead ends: 43 [2020-07-21 01:00:15,579 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 01:00:15,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 01:00:15,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 01:00:15,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 01:00:15,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 01:00:15,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 01:00:15,599 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 01:00:15,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:15,600 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 01:00:15,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 01:00:15,600 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 01:00:15,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 01:00:15,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:15,605 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:15,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:15,807 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:15,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:15,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-07-21 01:00:15,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:15,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022037328] [2020-07-21 01:00:15,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:15,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:00:15,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:15,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:00:15,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:16,063 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 01:00:16,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:18,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:18,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:19,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:19,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:19,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:19,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:19,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:20,586 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 01:00:20,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022037328] [2020-07-21 01:00:20,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:20,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 01:00:20,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608247373] [2020-07-21 01:00:20,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 01:00:20,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:20,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 01:00:20,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 01:00:20,594 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 01:00:20,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:20,839 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 01:00:20,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 01:00:20,841 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 01:00:20,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:20,842 INFO L225 Difference]: With dead ends: 46 [2020-07-21 01:00:20,843 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 01:00:20,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:00:20,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 01:00:20,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 01:00:20,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 01:00:20,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 01:00:20,856 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 01:00:20,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:20,856 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 01:00:20,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 01:00:20,856 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 01:00:20,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 01:00:20,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:20,858 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:21,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:21,069 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:21,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:21,070 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-07-21 01:00:21,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:21,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375158290] [2020-07-21 01:00:21,072 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:21,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:00:21,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:00:21,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 01:00:21,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:00:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-21 01:00:21,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:00:24,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:24,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:25,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:26,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:00:27,829 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 01:00:27,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375158290] [2020-07-21 01:00:27,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:00:27,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-21 01:00:27,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060738091] [2020-07-21 01:00:27,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 01:00:27,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:00:27,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 01:00:27,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:00:27,833 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-21 01:00:28,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:00:28,098 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 01:00:28,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:00:28,100 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-21 01:00:28,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:00:28,102 INFO L225 Difference]: With dead ends: 49 [2020-07-21 01:00:28,102 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 01:00:28,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 01:00:28,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 01:00:28,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 01:00:28,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 01:00:28,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 01:00:28,110 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 01:00:28,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:00:28,111 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 01:00:28,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 01:00:28,111 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 01:00:28,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 01:00:28,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:00:28,113 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:00:28,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:28,328 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:00:28,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:00:28,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-07-21 01:00:28,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:00:28,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011429945] [2020-07-21 01:00:28,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 01:00:28,539 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:00:28,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 01:00:28,540 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:00:28,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 01:00:28,562 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:00:28,593 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 01:00:28,594 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 01:00:28,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:00:28,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:00:28 BoogieIcfgContainer [2020-07-21 01:00:28,896 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:00:28,901 INFO L168 Benchmark]: Toolchain (without parser) took 27741.37 ms. Allocated memory was 143.7 MB in the beginning and 423.1 MB in the end (delta: 279.4 MB). Free memory was 100.3 MB in the beginning and 180.9 MB in the end (delta: -80.6 MB). Peak memory consumption was 198.9 MB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,902 INFO L168 Benchmark]: CDTParser took 0.47 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,908 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.09 ms. Allocated memory is still 143.7 MB. Free memory was 100.1 MB in the beginning and 90.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,909 INFO L168 Benchmark]: Boogie Preprocessor took 33.41 ms. Allocated memory is still 143.7 MB. Free memory was 90.8 MB in the beginning and 89.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,916 INFO L168 Benchmark]: RCFGBuilder took 407.69 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 89.5 MB in the beginning and 170.1 MB in the end (delta: -80.6 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,920 INFO L168 Benchmark]: TraceAbstraction took 27013.56 ms. Allocated memory was 201.9 MB in the beginning and 423.1 MB in the end (delta: 221.2 MB). Free memory was 169.4 MB in the beginning and 180.9 MB in the end (delta: -11.4 MB). Peak memory consumption was 209.8 MB. Max. memory is 7.1 GB. [2020-07-21 01:00:28,928 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.47 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.09 ms. Allocated memory is still 143.7 MB. Free memory was 100.1 MB in the beginning and 90.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.41 ms. Allocated memory is still 143.7 MB. Free memory was 90.8 MB in the beginning and 89.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 407.69 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 89.5 MB in the beginning and 170.1 MB in the end (delta: -80.6 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 27013.56 ms. Allocated memory was 201.9 MB in the beginning and 423.1 MB in the end (delta: 221.2 MB). Free memory was 169.4 MB in the beginning and 180.9 MB in the end (delta: -11.4 MB). Peak memory consumption was 209.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 10; [L13] int b = 0; VAL [a=10, b=0] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=10] [L4] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=10, m=0, n=10] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9] [L4] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=9, m=1, n=9] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8] [L4] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=8, m=2, n=8] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=7, m=3, n=7] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=6, m=4, n=6] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5] [L4] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=5, m=5, n=5] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4] [L4] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=4, m=6, n=4] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3] [L4] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=3, m=7, n=3] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=2, m=8, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=1, m=9, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=10, \old(n)=0, \result=10, m=10, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=1, m=9, n=1, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=2, m=8, n=2, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=3, m=7, n=3, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=4, m=6, n=4, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=5, m=5, n=5, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=6, m=4, n=6, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=7, m=3, n=7, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=8, m=2, n=8, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=9, m=1, n=9, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=10, m=0, n=10, sum(n - 1, m + 1)=10] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=10, b=0, sum(a, b)=10] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=10, b=0, result=10] [L16] __VERIFIER_error() VAL [a=10, b=0, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 26.7s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 123 SDtfs, 510 SDslu, 699 SDs, 0 SdLazy, 472 SolverSat, 197 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 832 GetRequests, 531 SyntacticMatches, 109 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 3.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 21.2s InterpolantComputationTime, 473 NumberOfCodeBlocks, 338 NumberOfCodeBlocksAsserted, 29 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 106872 SizeOfPredicates, 65 NumberOfNonLiveVariables, 875 ConjunctsInSsa, 130 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 615/1800 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...