/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:19:45,989 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:19:45,991 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:19:46,010 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:19:46,010 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:19:46,012 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:19:46,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:19:46,028 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:19:46,029 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:19:46,031 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:19:46,033 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:19:46,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:19:46,035 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:19:46,039 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:19:46,042 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:19:46,043 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:19:46,046 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:19:46,048 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:19:46,050 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:19:46,056 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:19:46,061 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:19:46,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:19:46,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:19:46,068 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:19:46,071 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:19:46,082 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:19:46,083 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:19:46,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:19:46,085 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 23:19:46,112 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:19:46,113 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:19:46,115 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:19:46,116 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:19:46,116 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:19:46,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:19:46,116 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:19:46,117 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:19:46,117 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:19:46,117 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:19:46,118 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:19:46,118 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:19:46,119 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:19:46,119 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:19:46,119 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:19:46,120 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:19:46,120 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:19:46,120 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:19:46,120 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:19:46,120 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:19:46,121 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:19:46,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:19:46,121 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:19:46,121 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:19:46,121 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:19:46,122 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:19:46,122 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:46,122 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:19:46,122 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:19:46,122 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 23:19:46,442 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:19:46,461 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:19:46,467 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:19:46,468 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:19:46,469 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:19:46,470 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 23:19:46,549 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b812fa2c7/9a734ea38d414a3ba4b1be1a18c97712/FLAG64f0000c2 [2020-07-21 23:19:47,019 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:19:47,019 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 23:19:47,028 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b812fa2c7/9a734ea38d414a3ba4b1be1a18c97712/FLAG64f0000c2 [2020-07-21 23:19:47,399 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b812fa2c7/9a734ea38d414a3ba4b1be1a18c97712 [2020-07-21 23:19:47,408 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:19:47,411 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:19:47,412 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:19:47,412 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:19:47,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:19:47,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,420 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@366b9138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47, skipping insertion in model container [2020-07-21 23:19:47,420 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,428 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:19:47,452 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:19:47,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:19:47,632 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:19:47,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:19:47,661 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:19:47,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47 WrapperNode [2020-07-21 23:19:47,662 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:19:47,663 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:19:47,663 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:19:47,663 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:19:47,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,678 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,678 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,689 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,690 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (1/1) ... [2020-07-21 23:19:47,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:19:47,772 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:19:47,772 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:19:47,773 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:19:47,774 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (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 23:19:47,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:19:47,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:19:47,843 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:19:47,843 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:19:47,843 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:19:47,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:19:47,843 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:19:47,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:19:48,087 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:19:48,089 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 23:19:48,095 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:19:48 BoogieIcfgContainer [2020-07-21 23:19:48,095 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:19:48,097 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:19:48,097 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:19:48,100 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:19:48,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:19:47" (1/3) ... [2020-07-21 23:19:48,101 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d669f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:19:48, skipping insertion in model container [2020-07-21 23:19:48,102 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:19:47" (2/3) ... [2020-07-21 23:19:48,102 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62d669f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:19:48, skipping insertion in model container [2020-07-21 23:19:48,102 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:19:48" (3/3) ... [2020-07-21 23:19:48,104 INFO L109 eAbstractionObserver]: Analyzing ICFG nested6.i [2020-07-21 23:19:48,118 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:19:48,139 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:19:48,162 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:19:48,204 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:19:48,204 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:19:48,205 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:19:48,205 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:19:48,205 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:19:48,205 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:19:48,205 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:19:48,205 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:19:48,230 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 23:19:48,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 23:19:48,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:48,236 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:48,237 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:48,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:48,242 INFO L82 PathProgramCache]: Analyzing trace with hash 404168940, now seen corresponding path program 1 times [2020-07-21 23:19:48,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:48,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237324108] [2020-07-21 23:19:48,250 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:48,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:48,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:48,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:19:48,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:48,378 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:48,405 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 23:19:48,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:48,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237324108] [2020-07-21 23:19:48,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:48,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:19:48,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380050420] [2020-07-21 23:19:48,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:19:48,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:48,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:19:48,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:19:48,427 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 5 states. [2020-07-21 23:19:48,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:48,554 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2020-07-21 23:19:48,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:19:48,555 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 23:19:48,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:48,566 INFO L225 Difference]: With dead ends: 57 [2020-07-21 23:19:48,566 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 23:19:48,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 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 23:19:48,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 23:19:48,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 23:19:48,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 23:19:48,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-21 23:19:48,620 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-07-21 23:19:48,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:48,620 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-21 23:19:48,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:19:48,621 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-21 23:19:48,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 23:19:48,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:48,623 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:48,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:48,824 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:48,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:48,825 INFO L82 PathProgramCache]: Analyzing trace with hash -849304486, now seen corresponding path program 1 times [2020-07-21 23:19:48,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:48,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365453628] [2020-07-21 23:19:48,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:48,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:48,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:48,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:19:48,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:48,891 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:48,910 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 23:19:48,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:48,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365453628] [2020-07-21 23:19:48,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:48,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 23:19:48,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490452119] [2020-07-21 23:19:48,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:19:48,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:48,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:19:48,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:19:48,915 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-07-21 23:19:49,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:49,093 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2020-07-21 23:19:49,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:19:49,094 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 23:19:49,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:49,095 INFO L225 Difference]: With dead ends: 40 [2020-07-21 23:19:49,095 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 23:19:49,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:19:49,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 23:19:49,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-07-21 23:19:49,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 23:19:49,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 23:19:49,122 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 16 [2020-07-21 23:19:49,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:49,123 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 23:19:49,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:19:49,124 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 23:19:49,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 23:19:49,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:49,126 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:49,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:49,327 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:49,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:49,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1573212483, now seen corresponding path program 1 times [2020-07-21 23:19:49,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:49,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119997056] [2020-07-21 23:19:49,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:19:49,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:49,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:49,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:19:49,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:49,379 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:49,395 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:19:49,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:49,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119997056] [2020-07-21 23:19:49,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:49,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:19:49,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556231296] [2020-07-21 23:19:49,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:19:49,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:49,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:19:49,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:19:49,399 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 5 states. [2020-07-21 23:19:49,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:49,471 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-07-21 23:19:49,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:19:49,472 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 23:19:49,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:49,473 INFO L225 Difference]: With dead ends: 45 [2020-07-21 23:19:49,474 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 23:19:49,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 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 23:19:49,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 23:19:49,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-21 23:19:49,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 23:19:49,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2020-07-21 23:19:49,485 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 20 [2020-07-21 23:19:49,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:49,486 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2020-07-21 23:19:49,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:19:49,486 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2020-07-21 23:19:49,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 23:19:49,488 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:49,488 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] [2020-07-21 23:19:49,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:49,704 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:49,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:49,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1604756500, now seen corresponding path program 1 times [2020-07-21 23:19:49,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:49,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157209759] [2020-07-21 23:19:49,707 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:49,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:19:49,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:49,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:19:49,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:51,870 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 23:19:51,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:51,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157209759] [2020-07-21 23:19:51,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:51,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:19:51,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945110153] [2020-07-21 23:19:51,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:19:51,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:51,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:19:51,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=12, Unknown=1, NotChecked=0, Total=20 [2020-07-21 23:19:51,873 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 5 states. [2020-07-21 23:19:53,368 WARN L193 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 23:19:55,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:55,596 INFO L93 Difference]: Finished difference Result 106 states and 136 transitions. [2020-07-21 23:19:55,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:19:55,600 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-07-21 23:19:55,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:55,602 INFO L225 Difference]: With dead ends: 106 [2020-07-21 23:19:55,602 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 23:19:55,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=17, Invalid=24, Unknown=1, NotChecked=0, Total=42 [2020-07-21 23:19:55,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 23:19:55,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 47. [2020-07-21 23:19:55,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 23:19:55,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2020-07-21 23:19:55,634 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 24 [2020-07-21 23:19:55,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:55,635 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2020-07-21 23:19:55,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:19:55,635 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2020-07-21 23:19:55,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 23:19:55,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:55,638 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 23:19:55,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:55,853 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:55,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:55,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1598241856, now seen corresponding path program 1 times [2020-07-21 23:19:55,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:55,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616512960] [2020-07-21 23:19:55,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:55,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:19:55,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:55,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:19:55,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:55,924 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 23:19:55,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:55,977 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 23:19:55,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616512960] [2020-07-21 23:19:55,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:55,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-07-21 23:19:55,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831943987] [2020-07-21 23:19:55,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:19:55,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:55,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:19:55,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:19:55,981 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 6 states. [2020-07-21 23:19:56,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:56,093 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2020-07-21 23:19:56,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 23:19:56,096 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-21 23:19:56,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:56,097 INFO L225 Difference]: With dead ends: 82 [2020-07-21 23:19:56,097 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 23:19:56,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:19:56,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 23:19:56,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2020-07-21 23:19:56,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 23:19:56,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2020-07-21 23:19:56,127 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 31 [2020-07-21 23:19:56,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:56,127 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2020-07-21 23:19:56,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:19:56,129 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2020-07-21 23:19:56,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 23:19:56,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:56,130 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-21 23:19:56,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:56,332 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:56,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:56,332 INFO L82 PathProgramCache]: Analyzing trace with hash 2099424040, now seen corresponding path program 1 times [2020-07-21 23:19:56,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:56,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230599858] [2020-07-21 23:19:56,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:56,364 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:19:56,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:56,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 23:19:56,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:56,461 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 23:19:56,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:56,558 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 23:19:56,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230599858] [2020-07-21 23:19:56,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:56,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-21 23:19:56,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277987837] [2020-07-21 23:19:56,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 23:19:56,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:56,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 23:19:56,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-07-21 23:19:56,561 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 13 states. [2020-07-21 23:19:56,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:56,922 INFO L93 Difference]: Finished difference Result 120 states and 156 transitions. [2020-07-21 23:19:56,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 23:19:56,923 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-21 23:19:56,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:56,925 INFO L225 Difference]: With dead ends: 120 [2020-07-21 23:19:56,925 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 23:19:56,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:19:56,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 23:19:56,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 56. [2020-07-21 23:19:56,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 23:19:56,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2020-07-21 23:19:56,942 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 34 [2020-07-21 23:19:56,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:56,943 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2020-07-21 23:19:56,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 23:19:56,943 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2020-07-21 23:19:56,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 23:19:56,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:56,945 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:57,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:57,150 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:57,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:57,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1702845076, now seen corresponding path program 2 times [2020-07-21 23:19:57,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:57,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068644119] [2020-07-21 23:19:57,153 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:57,184 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:57,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:57,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:19:57,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:57,209 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:57,231 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 23:19:57,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:57,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068644119] [2020-07-21 23:19:57,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:57,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 23:19:57,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176452503] [2020-07-21 23:19:57,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:19:57,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:57,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:19:57,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:19:57,235 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand 6 states. [2020-07-21 23:19:57,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:57,354 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2020-07-21 23:19:57,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:19:57,355 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 38 [2020-07-21 23:19:57,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:57,356 INFO L225 Difference]: With dead ends: 71 [2020-07-21 23:19:57,357 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 23:19:57,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:19:57,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 23:19:57,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2020-07-21 23:19:57,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 23:19:57,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2020-07-21 23:19:57,369 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 38 [2020-07-21 23:19:57,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:57,369 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2020-07-21 23:19:57,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:19:57,370 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2020-07-21 23:19:57,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 23:19:57,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:57,371 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:57,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:57,585 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:57,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:57,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1550723981, now seen corresponding path program 1 times [2020-07-21 23:19:57,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:57,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807542982] [2020-07-21 23:19:57,588 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:57,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:19:57,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:57,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:19:57,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:57,645 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 23:19:57,646 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:19:57,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807542982] [2020-07-21 23:19:57,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:19:57,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:19:57,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582571835] [2020-07-21 23:19:57,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:19:57,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:57,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:19:57,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:19:57,649 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand 4 states. [2020-07-21 23:19:57,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:57,712 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 23:19:57,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:19:57,716 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 40 [2020-07-21 23:19:57,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:57,716 INFO L225 Difference]: With dead ends: 86 [2020-07-21 23:19:57,716 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 23:19:57,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:19:57,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 23:19:57,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 23:19:57,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 23:19:57,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 23:19:57,723 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 40 [2020-07-21 23:19:57,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:57,723 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 23:19:57,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:19:57,724 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 23:19:57,724 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 23:19:57,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:57,927 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 23:19:58,468 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 23:19:58,468 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 23:19:58,468 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 23:19:58,469 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-21 23:19:58,469 INFO L268 CegarLoopResult]: For program point L31(lines 23 33) no Hoare annotation was computed. [2020-07-21 23:19:58,470 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 37) no Hoare annotation was computed. [2020-07-21 23:19:58,470 INFO L264 CegarLoopResult]: At program point L23-2(lines 23 33) the Hoare annotation is: (let ((.cse2 (* 2 main_~i~0))) (let ((.cse0 (<= main_~n~0 main_~k~0)) (.cse1 (<= .cse2 main_~j~0))) (or (and (<= main_~k~0 main_~n~0) .cse0 .cse1) (and (<= main_~i~0 0) (<= main_~k~0 (+ .cse2 1)) (<= main_~k~0 main_~j~0) .cse0 .cse1)))) [2020-07-21 23:19:58,470 INFO L268 CegarLoopResult]: For program point L24(lines 24 32) no Hoare annotation was computed. [2020-07-21 23:19:58,470 INFO L264 CegarLoopResult]: At program point L25-2(lines 25 27) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= .cse0 main_~k~0) (<= main_~k~0 main_~n~0) (<= .cse0 main_~j~0))) [2020-07-21 23:19:58,470 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 23:19:58,470 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 37) no Hoare annotation was computed. [2020-07-21 23:19:58,470 INFO L264 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 23:19:58,471 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 37) the Hoare annotation is: true [2020-07-21 23:19:58,471 INFO L264 CegarLoopResult]: At program point L30-1(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 23:19:58,471 INFO L264 CegarLoopResult]: At program point L26(line 26) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= (+ main_~k~0 1) main_~n~0) (<= .cse0 main_~k~0) (<= .cse0 main_~j~0))) [2020-07-21 23:19:58,471 INFO L268 CegarLoopResult]: For program point L26-1(lines 25 27) no Hoare annotation was computed. [2020-07-21 23:19:58,471 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 34) no Hoare annotation was computed. [2020-07-21 23:19:58,472 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 34) the Hoare annotation is: (let ((.cse0 (<= main_~k~0 main_~n~0)) (.cse1 (<= main_~n~0 main_~k~0)) (.cse3 (<= main_~n~0 main_~j~0))) (or (and (<= main_~i~0 0) .cse0 .cse1) (let ((.cse2 (div (+ (* main_~n~0 (- 1)) 1) (- 2)))) (and (<= .cse2 0) (< main_~k~0 (+ main_~i~0 1)) (<= (+ .cse2 1) main_~i~0) .cse1 .cse3)) (and .cse0 .cse1 .cse3))) [2020-07-21 23:19:58,472 INFO L268 CegarLoopResult]: For program point L18(lines 18 21) no Hoare annotation was computed. [2020-07-21 23:19:58,472 INFO L268 CegarLoopResult]: For program point L18-1(lines 18 21) no Hoare annotation was computed. [2020-07-21 23:19:58,472 INFO L271 CegarLoopResult]: At program point L35(lines 13 37) the Hoare annotation is: true [2020-07-21 23:19:58,472 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-21 23:19:58,472 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-21 23:19:58,472 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 23:19:58,473 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-07-21 23:19:58,473 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-07-21 23:19:58,473 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-07-21 23:19:58,489 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:19:58 BoogieIcfgContainer [2020-07-21 23:19:58,489 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 23:19:58,491 INFO L168 Benchmark]: Toolchain (without parser) took 11081.32 ms. Allocated memory was 138.4 MB in the beginning and 246.9 MB in the end (delta: 108.5 MB). Free memory was 102.2 MB in the beginning and 140.4 MB in the end (delta: -38.2 MB). Peak memory consumption was 70.3 MB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,492 INFO L168 Benchmark]: CDTParser took 0.55 ms. Allocated memory is still 138.4 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,493 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.90 ms. Allocated memory is still 138.4 MB. Free memory was 101.8 MB in the beginning and 92.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,495 INFO L168 Benchmark]: Boogie Preprocessor took 109.01 ms. Allocated memory was 138.4 MB in the beginning and 200.3 MB in the end (delta: 61.9 MB). Free memory was 92.2 MB in the beginning and 179.1 MB in the end (delta: -86.9 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,496 INFO L168 Benchmark]: RCFGBuilder took 323.28 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.1 MB in the end (delta: 13.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,497 INFO L168 Benchmark]: TraceAbstraction took 10392.30 ms. Allocated memory was 200.3 MB in the beginning and 246.9 MB in the end (delta: 46.7 MB). Free memory was 164.5 MB in the beginning and 140.4 MB in the end (delta: 24.1 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. [2020-07-21 23:19:58,501 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.55 ms. Allocated memory is still 138.4 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.90 ms. Allocated memory is still 138.4 MB. Free memory was 101.8 MB in the beginning and 92.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.01 ms. Allocated memory was 138.4 MB in the beginning and 200.3 MB in the end (delta: 61.9 MB). Free memory was 92.2 MB in the beginning and 179.1 MB in the end (delta: -86.9 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 323.28 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 165.1 MB in the end (delta: 13.9 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10392.30 ms. Allocated memory was 200.3 MB in the beginning and 246.9 MB in the end (delta: 46.7 MB). Free memory was 164.5 MB in the beginning and 140.4 MB in the end (delta: 24.1 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((j < n && 2 * i <= k) && k <= n) && 2 * i <= j - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (((i <= 0 && k <= n) && n <= k) || (((((n * -1 + 1) / -2 <= 0 && k < i + 1) && (n * -1 + 1) / -2 + 1 <= i) && n <= k) && n <= j)) || ((k <= n && n <= k) && n <= j) - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: ((k <= n && n <= k) && 2 * i <= j) || ((((i <= 0 && k <= 2 * i + 1) && k <= j) && n <= k) && 2 * i <= j) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.7s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 4.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 217 SDtfs, 120 SDslu, 558 SDs, 0 SdLazy, 427 SolverSat, 67 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 290 GetRequests, 237 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 3.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=58occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 76 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 12 LocationsWithAnnotation, 37 PreInvPairs, 56 NumberOfFragments, 160 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3079 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 12 FomulaSimplificationsInter, 298 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.6s InterpolantComputationTime, 218 NumberOfCodeBlocks, 182 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 273 ConstructedInterpolants, 1 QuantifiedInterpolants, 16841 SizeOfPredicates, 25 NumberOfNonLiveVariables, 437 ConjunctsInSsa, 38 ConjunctsInUnsatCore, 10 InterpolantComputations, 6 PerfectInterpolantSequences, 104/112 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...