/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:40,738 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:40,742 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:40,769 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:40,770 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:40,772 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:40,776 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:40,791 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:40,796 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:40,799 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:40,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:40,806 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:40,806 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:40,810 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:40,814 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:40,818 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:40,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:40,826 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:40,829 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:40,837 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:40,845 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:40,851 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:40,853 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:40,855 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:40,860 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:40,879 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:40,880 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:40,883 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:40,884 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 16:00:40,930 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:40,931 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:40,936 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:40,936 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:40,937 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:40,937 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:40,937 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:40,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:40,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:40,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:40,940 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:40,940 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:40,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:40,940 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:40,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:40,941 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:40,943 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:40,944 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:40,944 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:40,944 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:40,945 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:40,945 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:40,945 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:40,945 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:40,946 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:40,946 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:40,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,947 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:40,947 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:40,947 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:00:41,363 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:41,383 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:41,388 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:41,391 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:41,392 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:41,393 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 16:00:41,498 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eff891b2d/9467feb3d518423f8e7c63483128e438/FLAG7848b46e8 [2020-07-21 16:00:42,158 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:42,159 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 16:00:42,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eff891b2d/9467feb3d518423f8e7c63483128e438/FLAG7848b46e8 [2020-07-21 16:00:42,502 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eff891b2d/9467feb3d518423f8e7c63483128e438 [2020-07-21 16:00:42,521 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:42,526 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:42,528 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:42,529 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:42,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:42,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:42" (1/1) ... [2020-07-21 16:00:42,543 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@144d20f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:42, skipping insertion in model container [2020-07-21 16:00:42,543 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:42" (1/1) ... [2020-07-21 16:00:42,556 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:42,584 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:42,955 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:42,966 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:43,000 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:43,026 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:43,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43 WrapperNode [2020-07-21 16:00:43,027 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:43,030 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:43,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:43,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:43,055 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,187 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,196 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,208 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (1/1) ... [2020-07-21 16:00:43,211 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:43,215 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:43,215 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:43,215 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:43,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (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 16:00:43,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:43,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:43,319 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:43,319 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:43,320 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:43,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:43,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:43,322 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:43,323 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:43,323 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:43,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:43,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:43,579 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:43,580 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:43,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:43 BoogieIcfgContainer [2020-07-21 16:00:43,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:43,589 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:43,589 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:43,595 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:43,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:42" (1/3) ... [2020-07-21 16:00:43,597 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13925e5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:43, skipping insertion in model container [2020-07-21 16:00:43,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:43" (2/3) ... [2020-07-21 16:00:43,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13925e5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:43, skipping insertion in model container [2020-07-21 16:00:43,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:43" (3/3) ... [2020-07-21 16:00:43,601 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-21 16:00:43,618 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:43,630 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:43,652 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:43,687 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:43,687 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:43,687 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:43,687 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:43,688 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:43,688 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:43,688 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:43,688 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:43,720 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:43,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:43,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:43,731 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:43,732 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:43,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:43,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:43,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:43,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311852100] [2020-07-21 16:00:43,759 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:43,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:43,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:43,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:43,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:43,999 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 16:00:44,001 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:44,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311852100] [2020-07-21 16:00:44,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:44,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:44,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600523688] [2020-07-21 16:00:44,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:44,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:44,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:44,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:44,037 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:44,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,154 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:44,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:44,156 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:44,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,168 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:44,168 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:44,173 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 16:00:44,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:44,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:44,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:44,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:44,220 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:44,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,221 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:44,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:44,221 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:44,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:44,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,223 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:44,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,434 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:44,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434068707] [2020-07-21 16:00:44,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:44,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:44,542 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 16:00:44,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:44,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434068707] [2020-07-21 16:00:44,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:44,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:44,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304808788] [2020-07-21 16:00:44,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:44,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:44,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:44,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:44,548 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:44,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,619 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:44,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:44,620 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:44,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,622 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:44,622 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:44,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 16:00:44,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:44,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:44,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:44,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:44,634 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:44,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,635 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:44,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:44,635 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:44,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:44,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,637 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:44,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,852 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:44,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721676206] [2020-07-21 16:00:44,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:44,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:44,990 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 16:00:44,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:45,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,287 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 16:00:45,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721676206] [2020-07-21 16:00:45,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:45,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:45,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173504035] [2020-07-21 16:00:45,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:45,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:45,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:45,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:45,292 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:45,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:45,479 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:45,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:45,482 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:45,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:45,486 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:45,488 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:45,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:45,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:45,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:45,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:45,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:45,510 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:45,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:45,511 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:45,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:45,511 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:45,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:45,513 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:45,514 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:45,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,719 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:45,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:45,720 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:45,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:45,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822151242] [2020-07-21 16:00:45,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:45,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:45,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:45,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:45,824 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 16:00:45,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,044 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 16:00:46,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822151242] [2020-07-21 16:00:46,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:46,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:46,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114529059] [2020-07-21 16:00:46,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:46,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:46,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:46,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:46,048 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:46,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:46,210 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:46,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:46,211 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:46,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:46,213 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:46,213 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:46,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:46,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:46,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:46,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:46,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:46,225 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:46,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:46,226 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:46,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:46,226 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:46,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:46,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:46,229 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:46,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:46,443 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:46,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:46,444 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:46,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:46,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272267118] [2020-07-21 16:00:46,446 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:46,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:46,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:46,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:46,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:46,629 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:46,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,095 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:47,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272267118] [2020-07-21 16:00:47,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:47,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838132733] [2020-07-21 16:00:47,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:47,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:47,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:47,099 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:47,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,309 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:47,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:47,310 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:47,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,312 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:47,313 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:47,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:47,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:47,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:47,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:47,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:47,327 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:47,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,328 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:47,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:47,328 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:47,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:47,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,331 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:47,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,537 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,538 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:47,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48921830] [2020-07-21 16:00:47,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:47,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:47,658 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:47,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:47,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,017 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:48,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48921830] [2020-07-21 16:00:48,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:48,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:48,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073949398] [2020-07-21 16:00:48,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:48,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:48,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:48,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:48,021 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:48,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:48,386 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:48,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:48,388 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:48,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:48,390 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:48,390 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:48,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:48,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:48,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:48,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:48,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:48,419 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:48,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:48,420 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:48,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:48,421 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:48,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:48,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:48,432 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:48,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,638 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,639 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:48,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605371115] [2020-07-21 16:00:48,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:48,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,780 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:48,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,177 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:49,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605371115] [2020-07-21 16:00:49,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:49,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:49,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514074717] [2020-07-21 16:00:49,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:49,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:49,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:49,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:49,182 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 16:00:49,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:49,393 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:49,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:49,394 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 16:00:49,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:49,397 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:49,397 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:49,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:49,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:49,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:49,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:49,415 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:49,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:49,416 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:49,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:49,416 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:49,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:49,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:49,420 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:49,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,636 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:49,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:49,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:49,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:49,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140138535] [2020-07-21 16:00:49,638 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:49,686 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:49,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:49,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:49,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:49,749 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:49,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:50,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140138535] [2020-07-21 16:00:50,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:50,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:50,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890902715] [2020-07-21 16:00:50,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:50,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:50,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:50,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:50,077 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 16:00:50,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:50,245 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:50,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:50,247 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 16:00:50,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:50,253 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:50,253 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:50,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:50,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:50,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:50,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:50,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:50,304 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:50,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:50,307 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:50,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:50,308 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:50,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:50,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:50,316 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:50,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,532 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,533 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:50,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367817473] [2020-07-21 16:00:50,534 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:50,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:50,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:50,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:50,684 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:50,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,424 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:51,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367817473] [2020-07-21 16:00:51,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:51,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:51,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577991590] [2020-07-21 16:00:51,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:51,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:51,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:51,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:51,429 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 16:00:51,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:51,689 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:51,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:51,690 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:00:51,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:51,693 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:51,694 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:51,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:51,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:51,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:51,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:51,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:51,713 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:51,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:51,714 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:51,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:51,714 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:51,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:51,716 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:51,717 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:51,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,932 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:51,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:51,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 16:00:51,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:51,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841730685] [2020-07-21 16:00:51,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:51,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:52,087 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:52,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:52,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,583 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:52,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841730685] [2020-07-21 16:00:52,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:52,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994730830] [2020-07-21 16:00:52,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:52,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:52,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:52,587 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:52,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:52,836 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:52,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:52,836 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:52,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:52,838 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:52,839 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:52,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:52,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:52,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:52,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:52,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:52,853 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:52,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:52,853 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:52,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:52,853 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:52,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:52,855 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:52,856 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:53,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,071 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 16:00:53,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2143094913] [2020-07-21 16:00:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:53,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:53,233 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 16:00:53,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:53,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:53,868 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:53,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2143094913] [2020-07-21 16:00:53,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:53,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:53,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774394556] [2020-07-21 16:00:53,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:53,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:53,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:53,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:53,871 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:54,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:54,288 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:54,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:54,289 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 16:00:54,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:54,291 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:54,292 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:54,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:54,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:54,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:54,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:54,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:54,307 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 16:00:54,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:54,308 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:54,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:54,308 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:54,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 16:00:54,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:54,313 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:54,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,529 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:54,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:54,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 16:00:54,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:54,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661873818] [2020-07-21 16:00:54,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:54,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:54,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:54,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:54,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:54,709 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:54,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:55,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:55,649 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 16:00:55,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661873818] [2020-07-21 16:00:55,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:55,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:55,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431249448] [2020-07-21 16:00:55,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:55,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:55,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:55,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:55,653 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:56,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:56,716 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 16:00:56,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:56,717 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 16:00:56,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:56,724 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:00:56,725 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 16:00:56,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:00:56,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 16:00:56,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 16:00:56,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:00:56,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 16:00:56,776 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 16:00:56,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:56,778 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 16:00:56,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:56,778 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 16:00:56,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:56,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:56,783 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:56,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:56,998 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:56,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:56,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:56,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:56,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146904963] [2020-07-21 16:00:57,000 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:57,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:57,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:57,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:57,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:57,129 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 16:00:57,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:57,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,742 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:57,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146904963] [2020-07-21 16:00:57,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:57,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:57,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597779571] [2020-07-21 16:00:57,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:57,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:57,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:57,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:57,745 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 16:00:57,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:57,959 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 16:00:57,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:57,960 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 16:00:57,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:57,962 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:57,963 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:00:57,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:57,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:00:57,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 16:00:57,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 16:00:57,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 16:00:57,980 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 16:00:57,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:57,981 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 16:00:57,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:57,981 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 16:00:57,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:00:57,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:57,984 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:58,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,196 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:58,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:58,197 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 16:00:58,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:58,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658730017] [2020-07-21 16:00:58,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:58,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:58,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:58,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:58,403 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 16:00:58,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:58,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:58,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,271 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 16:00:59,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658730017] [2020-07-21 16:00:59,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:59,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 16:00:59,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42906943] [2020-07-21 16:00:59,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:59,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:59,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:59,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:59,276 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 16:00:59,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:59,898 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 16:00:59,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:59,904 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 16:00:59,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:59,909 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:00:59,909 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 16:00:59,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:59,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 16:00:59,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 16:00:59,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:00:59,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 16:00:59,947 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 16:00:59,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:59,950 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 16:00:59,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:59,951 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 16:00:59,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:00:59,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:59,954 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:00,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,168 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:00,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:00,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 16:01:00,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:00,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816057819] [2020-07-21 16:01:00,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,241 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:00,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:00,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:00,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:00,293 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 16:01:00,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:00,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,697 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:01:00,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816057819] [2020-07-21 16:01:00,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:00,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:01:00,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714832618] [2020-07-21 16:01:00,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:01:00,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:00,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:01:00,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:01:00,700 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 16:01:00,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:00,906 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 16:01:00,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:00,907 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 16:01:00,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:00,912 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:01:00,912 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:01:00,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:01:00,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:01:00,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 16:01:00,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 16:01:00,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 16:01:00,940 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 16:01:00,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:00,941 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 16:01:00,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:01:00,942 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 16:01:00,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:01:00,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:00,948 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:01,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:01,162 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:01,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:01,163 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 16:01:01,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:01,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116076372] [2020-07-21 16:01:01,164 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:01,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:01,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:01,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:01,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:01,428 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 16:01:01,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:02,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 16:01:02,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116076372] [2020-07-21 16:01:02,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:02,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:01:02,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214679627] [2020-07-21 16:01:02,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:02,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:02,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:02,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:02,949 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 16:01:03,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:03,634 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 16:01:03,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:01:03,635 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:01:03,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:03,641 INFO L225 Difference]: With dead ends: 369 [2020-07-21 16:01:03,641 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 16:01:03,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:03,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 16:01:03,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 16:01:03,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 16:01:03,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 16:01:03,680 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 16:01:03,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:03,681 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 16:01:03,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:03,681 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 16:01:03,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:01:03,685 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:03,686 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:03,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,900 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:03,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:03,901 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 16:01:03,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:03,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519073906] [2020-07-21 16:01:03,902 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:03,989 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:03,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:03,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:03,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:04,065 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:01:04,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:04,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,592 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:01:04,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519073906] [2020-07-21 16:01:04,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:04,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:01:04,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124612490] [2020-07-21 16:01:04,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:01:04,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:04,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:01:04,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:01:04,606 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 16:01:04,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:04,799 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 16:01:04,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:04,800 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 16:01:04,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:04,804 INFO L225 Difference]: With dead ends: 191 [2020-07-21 16:01:04,804 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 16:01:04,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:01:04,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 16:01:04,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 16:01:04,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:01:04,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 16:01:04,829 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 16:01:04,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:04,829 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 16:01:04,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:01:04,830 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 16:01:04,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 16:01:04,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:04,834 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:05,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:05,050 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:05,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:05,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 16:01:05,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:05,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017353910] [2020-07-21 16:01:05,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:05,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:05,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:05,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:05,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:05,256 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 16:01:05,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:05,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:06,336 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 16:01:06,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017353910] [2020-07-21 16:01:06,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:06,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:01:06,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50797043] [2020-07-21 16:01:06,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:06,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:06,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:06,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:06,339 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 16:01:06,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:06,610 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 16:01:06,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:06,611 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 16:01:06,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:06,615 INFO L225 Difference]: With dead ends: 206 [2020-07-21 16:01:06,615 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 16:01:06,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:06,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 16:01:06,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 16:01:06,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 16:01:06,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 16:01:06,641 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 16:01:06,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,642 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 16:01:06,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:06,643 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 16:01:06,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-07-21 16:01:06,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,647 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:06,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,862 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:06,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:06,863 INFO L82 PathProgramCache]: Analyzing trace with hash 959350702, now seen corresponding path program 5 times [2020-07-21 16:01:06,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:06,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593427344] [2020-07-21 16:01:06,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:06,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:07,062 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 253 proven. 31 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2020-07-21 16:01:07,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:07,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,157 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 55 proven. 151 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2020-07-21 16:01:08,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593427344] [2020-07-21 16:01:08,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:08,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:01:08,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165643427] [2020-07-21 16:01:08,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:08,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:08,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:08,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:08,161 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 16:01:08,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:08,604 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 16:01:08,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:01:08,605 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 132 [2020-07-21 16:01:08,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:08,608 INFO L225 Difference]: With dead ends: 376 [2020-07-21 16:01:08,609 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 16:01:08,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 238 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:01:08,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 16:01:08,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 16:01:08,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 16:01:08,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 16:01:08,635 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 132 [2020-07-21 16:01:08,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,636 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 16:01:08,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:08,636 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 16:01:08,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 16:01:08,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,641 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,855 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,856 INFO L82 PathProgramCache]: Analyzing trace with hash -937655835, now seen corresponding path program 6 times [2020-07-21 16:01:08,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8697325] [2020-07-21 16:01:08,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:08,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:08,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:08,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:09,151 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 106 proven. 206 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 16:01:09,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:10,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,297 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 106 proven. 216 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2020-07-21 16:01:11,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8697325] [2020-07-21 16:01:11,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:11,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:11,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664295253] [2020-07-21 16:01:11,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:11,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:11,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:11,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:11,306 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 23 states. [2020-07-21 16:01:12,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:12,341 INFO L93 Difference]: Finished difference Result 427 states and 841 transitions. [2020-07-21 16:01:12,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:12,343 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 149 [2020-07-21 16:01:12,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:12,348 INFO L225 Difference]: With dead ends: 427 [2020-07-21 16:01:12,348 INFO L226 Difference]: Without dead ends: 240 [2020-07-21 16:01:12,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 259 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:12,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-21 16:01:12,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 213. [2020-07-21 16:01:12,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-21 16:01:12,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 383 transitions. [2020-07-21 16:01:12,378 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 383 transitions. Word has length 149 [2020-07-21 16:01:12,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:12,378 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 383 transitions. [2020-07-21 16:01:12,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:12,379 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 383 transitions. [2020-07-21 16:01:12,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 16:01:12,383 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:12,383 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:12,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:12,597 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:12,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:12,598 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 7 times [2020-07-21 16:01:12,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:12,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043489148] [2020-07-21 16:01:12,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:12,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:12,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:12,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:12,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:12,932 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 91 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 16:01:12,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:13,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,482 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 97 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2020-07-21 16:01:14,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043489148] [2020-07-21 16:01:14,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:14,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:14,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499992928] [2020-07-21 16:01:14,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:14,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:14,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:14,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:14,486 INFO L87 Difference]: Start difference. First operand 213 states and 383 transitions. Second operand 21 states. [2020-07-21 16:01:15,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:15,320 INFO L93 Difference]: Finished difference Result 433 states and 835 transitions. [2020-07-21 16:01:15,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:15,321 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 107 [2020-07-21 16:01:15,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:15,327 INFO L225 Difference]: With dead ends: 433 [2020-07-21 16:01:15,328 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 16:01:15,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 185 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:15,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 16:01:15,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 210. [2020-07-21 16:01:15,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-07-21 16:01:15,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 362 transitions. [2020-07-21 16:01:15,362 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 362 transitions. Word has length 107 [2020-07-21 16:01:15,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:15,362 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 362 transitions. [2020-07-21 16:01:15,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:15,363 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 362 transitions. [2020-07-21 16:01:15,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:15,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:15,368 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:15,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,583 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:15,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:15,584 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 8 times [2020-07-21 16:01:15,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:15,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104649436] [2020-07-21 16:01:15,584 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,712 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:15,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:15,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:15,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:15,812 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 129 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-07-21 16:01:15,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:16,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,030 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 139 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-07-21 16:01:17,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104649436] [2020-07-21 16:01:17,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:17,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:01:17,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803446969] [2020-07-21 16:01:17,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:01:17,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:17,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:01:17,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:01:17,033 INFO L87 Difference]: Start difference. First operand 210 states and 362 transitions. Second operand 15 states. [2020-07-21 16:01:17,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:17,336 INFO L93 Difference]: Finished difference Result 217 states and 373 transitions. [2020-07-21 16:01:17,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:17,340 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-21 16:01:17,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:17,346 INFO L225 Difference]: With dead ends: 217 [2020-07-21 16:01:17,346 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 16:01:17,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 217 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:17,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 16:01:17,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 210. [2020-07-21 16:01:17,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-07-21 16:01:17,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 362 transitions. [2020-07-21 16:01:17,379 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 362 transitions. Word has length 121 [2020-07-21 16:01:17,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:17,380 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 362 transitions. [2020-07-21 16:01:17,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:01:17,380 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 362 transitions. [2020-07-21 16:01:17,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:17,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:17,386 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:17,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:17,600 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:17,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:17,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 9 times [2020-07-21 16:01:17,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:17,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053377123] [2020-07-21 16:01:17,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:17,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:17,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:17,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:17,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:17,868 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-21 16:01:17,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:18,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,743 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-21 16:01:18,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053377123] [2020-07-21 16:01:18,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:18,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:18,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677042369] [2020-07-21 16:01:18,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:18,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:18,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:18,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:18,745 INFO L87 Difference]: Start difference. First operand 210 states and 362 transitions. Second operand 13 states. [2020-07-21 16:01:18,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:18,964 INFO L93 Difference]: Finished difference Result 269 states and 511 transitions. [2020-07-21 16:01:18,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:18,965 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-21 16:01:18,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:18,969 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:01:18,969 INFO L226 Difference]: Without dead ends: 265 [2020-07-21 16:01:18,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:18,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-21 16:01:18,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 223. [2020-07-21 16:01:18,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2020-07-21 16:01:18,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 392 transitions. [2020-07-21 16:01:19,000 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 392 transitions. Word has length 121 [2020-07-21 16:01:19,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:19,001 INFO L479 AbstractCegarLoop]: Abstraction has 223 states and 392 transitions. [2020-07-21 16:01:19,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:19,001 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 392 transitions. [2020-07-21 16:01:19,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 16:01:19,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:19,007 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:19,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,223 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:19,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:19,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1054516041, now seen corresponding path program 10 times [2020-07-21 16:01:19,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:19,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391898737] [2020-07-21 16:01:19,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,377 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:19,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:19,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:19,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:19,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 244 proven. 189 refuted. 0 times theorem prover too weak. 591 trivial. 0 not checked. [2020-07-21 16:01:19,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:20,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 246 proven. 194 refuted. 0 times theorem prover too weak. 584 trivial. 0 not checked. [2020-07-21 16:01:21,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391898737] [2020-07-21 16:01:21,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:21,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-21 16:01:21,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991716156] [2020-07-21 16:01:21,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:21,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:21,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:21,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:21,278 INFO L87 Difference]: Start difference. First operand 223 states and 392 transitions. Second operand 23 states. [2020-07-21 16:01:22,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:22,114 INFO L93 Difference]: Finished difference Result 569 states and 1104 transitions. [2020-07-21 16:01:22,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:01:22,115 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 199 [2020-07-21 16:01:22,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:22,122 INFO L225 Difference]: With dead ends: 569 [2020-07-21 16:01:22,122 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 16:01:22,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 363 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=229, Invalid=1103, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:22,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 16:01:22,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 304. [2020-07-21 16:01:22,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 16:01:22,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 569 transitions. [2020-07-21 16:01:22,157 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 569 transitions. Word has length 199 [2020-07-21 16:01:22,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:22,158 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 569 transitions. [2020-07-21 16:01:22,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:22,159 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 569 transitions. [2020-07-21 16:01:22,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:22,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:22,165 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:22,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:22,379 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:22,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:22,380 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 2 times [2020-07-21 16:01:22,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:22,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912174636] [2020-07-21 16:01:22,381 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:22,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:22,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:22,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:22,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:22,613 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 92 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2020-07-21 16:01:22,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:23,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,532 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 97 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2020-07-21 16:01:23,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912174636] [2020-07-21 16:01:23,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:23,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:23,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872767874] [2020-07-21 16:01:23,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:23,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:23,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:23,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:23,536 INFO L87 Difference]: Start difference. First operand 304 states and 569 transitions. Second operand 13 states. [2020-07-21 16:01:23,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:23,801 INFO L93 Difference]: Finished difference Result 326 states and 607 transitions. [2020-07-21 16:01:23,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:23,803 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-21 16:01:23,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:23,810 INFO L225 Difference]: With dead ends: 326 [2020-07-21 16:01:23,810 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:01:23,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:23,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:01:23,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 303. [2020-07-21 16:01:23,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2020-07-21 16:01:23,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 557 transitions. [2020-07-21 16:01:23,862 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 557 transitions. Word has length 145 [2020-07-21 16:01:23,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:23,863 INFO L479 AbstractCegarLoop]: Abstraction has 303 states and 557 transitions. [2020-07-21 16:01:23,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:23,863 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 557 transitions. [2020-07-21 16:01:23,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-21 16:01:23,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:23,872 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 15, 14, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 8, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:24,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:24,087 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:24,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:24,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1572479939, now seen corresponding path program 11 times [2020-07-21 16:01:24,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:24,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333790734] [2020-07-21 16:01:24,090 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:24,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:24,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:24,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:24,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:24,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2572 backedges. 1441 proven. 202 refuted. 0 times theorem prover too weak. 929 trivial. 0 not checked. [2020-07-21 16:01:24,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:26,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2572 backedges. 182 proven. 718 refuted. 0 times theorem prover too weak. 1672 trivial. 0 not checked. [2020-07-21 16:01:27,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333790734] [2020-07-21 16:01:27,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:27,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:27,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518897373] [2020-07-21 16:01:27,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:27,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:27,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:27,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:27,220 INFO L87 Difference]: Start difference. First operand 303 states and 557 transitions. Second operand 23 states. [2020-07-21 16:01:28,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:28,338 INFO L93 Difference]: Finished difference Result 646 states and 1275 transitions. [2020-07-21 16:01:28,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:28,340 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 306 [2020-07-21 16:01:28,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:28,347 INFO L225 Difference]: With dead ends: 646 [2020-07-21 16:01:28,347 INFO L226 Difference]: Without dead ends: 339 [2020-07-21 16:01:28,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 573 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:28,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2020-07-21 16:01:28,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 294. [2020-07-21 16:01:28,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-07-21 16:01:28,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 529 transitions. [2020-07-21 16:01:28,395 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 529 transitions. Word has length 306 [2020-07-21 16:01:28,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:28,396 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 529 transitions. [2020-07-21 16:01:28,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:28,397 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 529 transitions. [2020-07-21 16:01:28,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-07-21 16:01:28,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:28,404 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 9, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:28,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,618 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:28,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:28,619 INFO L82 PathProgramCache]: Analyzing trace with hash -420357685, now seen corresponding path program 12 times [2020-07-21 16:01:28,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:28,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303753791] [2020-07-21 16:01:28,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:28,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:28,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:28,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:29,171 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 443 proven. 86 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 16:01:29,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:30,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:31,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:31,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:31,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 99 proven. 240 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-21 16:01:31,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303753791] [2020-07-21 16:01:31,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:31,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:31,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188189824] [2020-07-21 16:01:31,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:31,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:31,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:31,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:31,178 INFO L87 Difference]: Start difference. First operand 294 states and 529 transitions. Second operand 19 states. [2020-07-21 16:01:31,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:31,895 INFO L93 Difference]: Finished difference Result 608 states and 1122 transitions. [2020-07-21 16:01:31,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:01:31,897 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 173 [2020-07-21 16:01:31,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:31,902 INFO L225 Difference]: With dead ends: 608 [2020-07-21 16:01:31,903 INFO L226 Difference]: Without dead ends: 320 [2020-07-21 16:01:31,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 315 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:01:31,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-07-21 16:01:31,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 289. [2020-07-21 16:01:31,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2020-07-21 16:01:31,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 514 transitions. [2020-07-21 16:01:31,944 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 514 transitions. Word has length 173 [2020-07-21 16:01:31,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:31,945 INFO L479 AbstractCegarLoop]: Abstraction has 289 states and 514 transitions. [2020-07-21 16:01:31,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:31,945 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 514 transitions. [2020-07-21 16:01:31,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2020-07-21 16:01:31,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:31,952 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:32,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:32,168 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:32,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:32,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1936088055, now seen corresponding path program 13 times [2020-07-21 16:01:32,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:32,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037672428] [2020-07-21 16:01:32,170 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:32,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:32,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:32,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:32,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:32,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 203 proven. 304 refuted. 0 times theorem prover too weak. 501 trivial. 0 not checked. [2020-07-21 16:01:32,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:33,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:35,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:35,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:35,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:35,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:35,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 203 proven. 317 refuted. 0 times theorem prover too weak. 488 trivial. 0 not checked. [2020-07-21 16:01:35,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037672428] [2020-07-21 16:01:35,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:35,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 27 [2020-07-21 16:01:35,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82449474] [2020-07-21 16:01:35,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:01:35,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:35,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:01:35,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:35,412 INFO L87 Difference]: Start difference. First operand 289 states and 514 transitions. Second operand 27 states. [2020-07-21 16:01:36,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:36,594 INFO L93 Difference]: Finished difference Result 606 states and 1162 transitions. [2020-07-21 16:01:36,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:36,595 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 197 [2020-07-21 16:01:36,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:36,601 INFO L225 Difference]: With dead ends: 606 [2020-07-21 16:01:36,602 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:01:36,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 352 SyntacticMatches, 17 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=361, Invalid=1895, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 16:01:36,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:01:36,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 273. [2020-07-21 16:01:36,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 16:01:36,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 471 transitions. [2020-07-21 16:01:36,648 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 471 transitions. Word has length 197 [2020-07-21 16:01:36,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:36,649 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 471 transitions. [2020-07-21 16:01:36,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:01:36,649 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 471 transitions. [2020-07-21 16:01:36,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:36,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:36,654 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:36,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,868 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:36,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:36,869 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 14 times [2020-07-21 16:01:36,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:36,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411523782] [2020-07-21 16:01:36,871 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:37,141 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:37,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:37,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:37,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:37,243 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:01:37,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:37,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,318 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 16:01:38,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411523782] [2020-07-21 16:01:38,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:38,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:38,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934678274] [2020-07-21 16:01:38,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:38,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:38,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:38,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:38,321 INFO L87 Difference]: Start difference. First operand 273 states and 471 transitions. Second operand 13 states. [2020-07-21 16:01:38,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:38,593 INFO L93 Difference]: Finished difference Result 286 states and 488 transitions. [2020-07-21 16:01:38,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:38,595 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-21 16:01:38,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:38,600 INFO L225 Difference]: With dead ends: 286 [2020-07-21 16:01:38,600 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 16:01:38,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:38,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 16:01:38,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 273. [2020-07-21 16:01:38,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-07-21 16:01:38,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 471 transitions. [2020-07-21 16:01:38,631 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 471 transitions. Word has length 145 [2020-07-21 16:01:38,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:38,631 INFO L479 AbstractCegarLoop]: Abstraction has 273 states and 471 transitions. [2020-07-21 16:01:38,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:38,632 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 471 transitions. [2020-07-21 16:01:38,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2020-07-21 16:01:38,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:38,637 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:38,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:38,851 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:38,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:38,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1752514538, now seen corresponding path program 4 times [2020-07-21 16:01:38,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:38,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910509300] [2020-07-21 16:01:38,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:39,114 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:39,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:39,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:39,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:39,230 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 49 proven. 259 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2020-07-21 16:01:39,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:40,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:40,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 49 proven. 273 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2020-07-21 16:01:41,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910509300] [2020-07-21 16:01:41,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:41,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:01:41,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964516926] [2020-07-21 16:01:41,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:41,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:41,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:41,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:41,268 INFO L87 Difference]: Start difference. First operand 273 states and 471 transitions. Second operand 17 states. [2020-07-21 16:01:41,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:41,677 INFO L93 Difference]: Finished difference Result 288 states and 498 transitions. [2020-07-21 16:01:41,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:41,679 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 182 [2020-07-21 16:01:41,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:41,683 INFO L225 Difference]: With dead ends: 288 [2020-07-21 16:01:41,684 INFO L226 Difference]: Without dead ends: 284 [2020-07-21 16:01:41,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 337 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:41,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2020-07-21 16:01:41,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 268. [2020-07-21 16:01:41,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 16:01:41,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 461 transitions. [2020-07-21 16:01:41,717 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 461 transitions. Word has length 182 [2020-07-21 16:01:41,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:41,718 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 461 transitions. [2020-07-21 16:01:41,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:41,718 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 461 transitions. [2020-07-21 16:01:41,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2020-07-21 16:01:41,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:41,724 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:41,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:41,939 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:41,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:41,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1848436638, now seen corresponding path program 15 times [2020-07-21 16:01:41,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:41,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910038297] [2020-07-21 16:01:41,941 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:42,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:42,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:42,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:42,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:42,422 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 545 proven. 77 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2020-07-21 16:01:42,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:43,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:44,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:44,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:44,130 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 163 proven. 222 refuted. 0 times theorem prover too weak. 507 trivial. 0 not checked. [2020-07-21 16:01:44,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910038297] [2020-07-21 16:01:44,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:44,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:44,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959834480] [2020-07-21 16:01:44,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:44,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:44,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:44,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:44,132 INFO L87 Difference]: Start difference. First operand 268 states and 461 transitions. Second operand 19 states. [2020-07-21 16:01:44,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:44,805 INFO L93 Difference]: Finished difference Result 544 states and 946 transitions. [2020-07-21 16:01:44,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:01:44,807 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 186 [2020-07-21 16:01:44,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:44,813 INFO L225 Difference]: With dead ends: 544 [2020-07-21 16:01:44,813 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 16:01:44,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 341 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:01:44,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 16:01:44,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 266. [2020-07-21 16:01:44,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-07-21 16:01:44,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 450 transitions. [2020-07-21 16:01:44,851 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 450 transitions. Word has length 186 [2020-07-21 16:01:44,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:44,852 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 450 transitions. [2020-07-21 16:01:44,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:44,852 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 450 transitions. [2020-07-21 16:01:44,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2020-07-21 16:01:44,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:44,860 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 9, 8, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:45,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:45,076 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:45,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:45,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1152628284, now seen corresponding path program 16 times [2020-07-21 16:01:45,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:45,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1837734299] [2020-07-21 16:01:45,078 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:45,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:45,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:45,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:45,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:45,579 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 196 proven. 268 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 16:01:45,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:46,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:48,181 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 196 proven. 282 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-07-21 16:01:48,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1837734299] [2020-07-21 16:01:48,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:48,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:48,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728262430] [2020-07-21 16:01:48,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:48,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:48,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:48,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:48,183 INFO L87 Difference]: Start difference. First operand 266 states and 450 transitions. Second operand 25 states. [2020-07-21 16:01:49,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:49,343 INFO L93 Difference]: Finished difference Result 547 states and 980 transitions. [2020-07-21 16:01:49,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:49,345 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 186 [2020-07-21 16:01:49,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:49,353 INFO L225 Difference]: With dead ends: 547 [2020-07-21 16:01:49,354 INFO L226 Difference]: Without dead ends: 285 [2020-07-21 16:01:49,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 329 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:49,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-21 16:01:49,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 253. [2020-07-21 16:01:49,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-07-21 16:01:49,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 397 transitions. [2020-07-21 16:01:49,392 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 397 transitions. Word has length 186 [2020-07-21 16:01:49,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:49,393 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 397 transitions. [2020-07-21 16:01:49,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:49,393 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 397 transitions. [2020-07-21 16:01:49,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:01:49,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:49,399 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:49,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:49,613 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:49,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:49,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1083167591, now seen corresponding path program 17 times [2020-07-21 16:01:49,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:49,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526289537] [2020-07-21 16:01:49,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:49,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:49,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:49,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 16:01:49,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:50,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 202 proven. 183 refuted. 0 times theorem prover too weak. 657 trivial. 0 not checked. [2020-07-21 16:01:50,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:51,584 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:51,707 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:51,844 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:51,983 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:52,535 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 16:01:53,048 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2020-07-21 16:01:53,339 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 131 [2020-07-21 16:01:53,652 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2020-07-21 16:01:53,949 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2020-07-21 16:01:57,482 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:57,607 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 16:01:57,742 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:01:57,876 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:02:00,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 228 proven. 174 refuted. 0 times theorem prover too weak. 640 trivial. 0 not checked. [2020-07-21 16:02:00,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526289537] [2020-07-21 16:02:00,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:00,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 51 [2020-07-21 16:02:00,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621844465] [2020-07-21 16:02:00,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 16:02:00,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:00,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 16:02:00,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=2264, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 16:02:00,113 INFO L87 Difference]: Start difference. First operand 253 states and 397 transitions. Second operand 51 states. [2020-07-21 16:02:01,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:01,678 INFO L93 Difference]: Finished difference Result 469 states and 1001 transitions. [2020-07-21 16:02:01,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 16:02:01,680 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 201 [2020-07-21 16:02:01,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:01,690 INFO L225 Difference]: With dead ends: 469 [2020-07-21 16:02:01,690 INFO L226 Difference]: Without dead ends: 463 [2020-07-21 16:02:01,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 316 SyntacticMatches, 36 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3135 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=707, Invalid=5145, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 16:02:01,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2020-07-21 16:02:01,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 388. [2020-07-21 16:02:01,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 388 states. [2020-07-21 16:02:01,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 858 transitions. [2020-07-21 16:02:01,742 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 858 transitions. Word has length 201 [2020-07-21 16:02:01,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:01,744 INFO L479 AbstractCegarLoop]: Abstraction has 388 states and 858 transitions. [2020-07-21 16:02:01,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 16:02:01,744 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 858 transitions. [2020-07-21 16:02:01,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2020-07-21 16:02:01,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:01,752 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 13, 12, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:01,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,968 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:01,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:01,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1647870131, now seen corresponding path program 18 times [2020-07-21 16:02:01,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:01,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169077929] [2020-07-21 16:02:01,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:02,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:02,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:02,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:02:02,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:02,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1756 backedges. 1024 proven. 189 refuted. 0 times theorem prover too weak. 543 trivial. 0 not checked. [2020-07-21 16:02:02,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:04,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:04,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:05,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1756 backedges. 235 proven. 491 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2020-07-21 16:02:05,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169077929] [2020-07-21 16:02:05,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:05,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:02:05,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035198588] [2020-07-21 16:02:05,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:02:05,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:05,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:02:05,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:05,894 INFO L87 Difference]: Start difference. First operand 388 states and 858 transitions. Second operand 23 states. [2020-07-21 16:02:07,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:07,053 INFO L93 Difference]: Finished difference Result 847 states and 2258 transitions. [2020-07-21 16:02:07,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:02:07,054 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 254 [2020-07-21 16:02:07,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:07,062 INFO L225 Difference]: With dead ends: 847 [2020-07-21 16:02:07,062 INFO L226 Difference]: Without dead ends: 465 [2020-07-21 16:02:07,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 469 SyntacticMatches, 17 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=236, Invalid=1096, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:02:07,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2020-07-21 16:02:07,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 418. [2020-07-21 16:02:07,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 418 states. [2020-07-21 16:02:07,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 1024 transitions. [2020-07-21 16:02:07,121 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 1024 transitions. Word has length 254 [2020-07-21 16:02:07,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:07,122 INFO L479 AbstractCegarLoop]: Abstraction has 418 states and 1024 transitions. [2020-07-21 16:02:07,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:02:07,122 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 1024 transitions. [2020-07-21 16:02:07,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:02:07,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:07,131 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:07,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:07,345 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:07,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:07,346 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 19 times [2020-07-21 16:02:07,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:07,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543094572] [2020-07-21 16:02:07,347 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:07,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:07,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:02:07,670 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:02:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:02:07,711 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:02:07,754 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:02:07,754 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:02:07,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:08,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:02:08 BoogieIcfgContainer [2020-07-21 16:02:08,037 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:02:08,039 INFO L168 Benchmark]: Toolchain (without parser) took 85516.22 ms. Allocated memory was 145.2 MB in the beginning and 724.0 MB in the end (delta: 578.8 MB). Free memory was 101.9 MB in the beginning and 187.9 MB in the end (delta: -85.9 MB). Peak memory consumption was 492.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,040 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 145.2 MB. Free memory was 120.2 MB in the beginning and 119.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,040 INFO L168 Benchmark]: CACSL2BoogieTranslator took 499.86 ms. Allocated memory is still 145.2 MB. Free memory was 101.5 MB in the beginning and 92.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,041 INFO L168 Benchmark]: Boogie Preprocessor took 184.72 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.1 MB in the beginning and 180.9 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,041 INFO L168 Benchmark]: RCFGBuilder took 372.20 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 168.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,041 INFO L168 Benchmark]: TraceAbstraction took 84448.20 ms. Allocated memory was 202.4 MB in the beginning and 724.0 MB in the end (delta: 521.7 MB). Free memory was 167.6 MB in the beginning and 187.9 MB in the end (delta: -20.3 MB). Peak memory consumption was 501.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:08,043 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 145.2 MB. Free memory was 120.2 MB in the beginning and 119.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 499.86 ms. Allocated memory is still 145.2 MB. Free memory was 101.5 MB in the beginning and 92.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 184.72 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 92.1 MB in the beginning and 180.9 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 372.20 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 168.3 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 84448.20 ms. Allocated memory was 202.4 MB in the beginning and 724.0 MB in the end (delta: 521.7 MB). Free memory was 167.6 MB in the beginning and 187.9 MB in the end (delta: -20.3 MB). Peak memory consumption was 501.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 84.2s, OverallIterations: 35, TraceHistogramMax: 23, AutomataDifference: 18.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1019 SDtfs, 2206 SDslu, 7721 SDs, 0 SdLazy, 8801 SolverSat, 2354 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 7.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8125 GetRequests, 6979 SyntacticMatches, 357 SemanticMatches, 789 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6031 ImplicationChecksByTransitivity, 15.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=418occurred in iteration=34, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.9s AutomataMinimizationTime, 34 MinimizatonAttempts, 645 StatesRemovedByMinimization, 33 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.2s SatisfiabilityAnalysisTime, 52.1s InterpolantComputationTime, 4100 NumberOfCodeBlocks, 2923 NumberOfCodeBlocksAsserted, 54 NumberOfCheckSat, 7753 ConstructedInterpolants, 0 QuantifiedInterpolants, 2183615 SizeOfPredicates, 207 NumberOfNonLiveVariables, 7057 ConjunctsInSsa, 440 ConjunctsInUnsatCore, 66 InterpolantComputations, 2 PerfectInterpolantSequences, 23692/30962 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...