/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 DAGSIZE --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/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:20:45,229 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:20:45,233 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:20:45,250 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:20:45,251 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:20:45,253 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:20:45,255 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:20:45,257 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:20:45,260 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:20:45,261 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:20:45,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:20:45,264 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:20:45,265 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:20:45,267 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:20:45,269 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:20:45,270 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:20:45,272 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:20:45,273 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:20:45,276 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:20:45,278 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:20:45,280 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:20:45,282 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:20:45,284 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:20:45,285 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:20:45,287 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:20:45,300 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:20:45,302 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:20:45,303 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:20:45,304 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 20:20:45,322 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:20:45,323 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:20:45,325 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:20:45,325 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:20:45,326 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:20:45,326 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:20:45,326 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:20:45,326 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:20:45,327 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:20:45,327 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:20:45,327 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:20:45,327 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:20:45,328 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:20:45,328 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:20:45,328 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:20:45,328 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:20:45,329 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:20:45,329 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:20:45,329 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:20:45,329 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:20:45,330 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:20:45,330 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:20:45,330 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:20:45,330 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:20:45,331 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:20:45,331 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:20:45,331 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:45,331 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:20:45,332 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:20:45,332 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 -> DAGSIZE 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 20:20:45,727 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:20:45,755 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:20:45,760 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:20:45,763 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:20:45,763 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:20:45,766 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 20:20:45,874 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b120357c6/fbcc6987cbc24f14bde4f2f41d30b2ec/FLAG6b3e8b0a0 [2020-07-21 20:20:46,461 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:20:46,462 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 20:20:46,471 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b120357c6/fbcc6987cbc24f14bde4f2f41d30b2ec/FLAG6b3e8b0a0 [2020-07-21 20:20:46,839 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b120357c6/fbcc6987cbc24f14bde4f2f41d30b2ec [2020-07-21 20:20:46,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:20:46,858 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:20:46,859 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:46,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:20:46,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:20:46,865 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:46" (1/1) ... [2020-07-21 20:20:46,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27edf361 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:46, skipping insertion in model container [2020-07-21 20:20:46,870 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:46" (1/1) ... [2020-07-21 20:20:46,880 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:20:46,899 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:20:47,098 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:47,105 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:20:47,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:47,152 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:20:47,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47 WrapperNode [2020-07-21 20:20:47,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:47,155 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:20:47,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:20:47,155 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:20:47,260 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,261 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,269 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,270 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,290 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (1/1) ... [2020-07-21 20:20:47,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:20:47,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:20:47,297 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:20:47,297 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:20:47,298 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (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 20:20:47,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:20:47,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:20:47,399 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:20:47,399 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:20:47,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:20:47,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:20:47,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:20:47,400 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:20:47,400 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 20:20:47,400 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 20:20:47,400 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 20:20:47,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 20:20:47,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:20:47,401 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:20:47,721 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:20:47,722 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 20:20:47,730 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:47 BoogieIcfgContainer [2020-07-21 20:20:47,731 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:20:47,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:20:47,742 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:20:47,750 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:20:47,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:20:46" (1/3) ... [2020-07-21 20:20:47,760 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74aeeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:47, skipping insertion in model container [2020-07-21 20:20:47,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:47" (2/3) ... [2020-07-21 20:20:47,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74aeeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:47, skipping insertion in model container [2020-07-21 20:20:47,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:47" (3/3) ... [2020-07-21 20:20:47,769 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-21 20:20:47,806 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:20:47,830 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:20:47,855 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:20:47,885 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:20:47,886 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:20:47,886 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:20:47,886 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:20:47,886 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:20:47,886 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:20:47,887 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:20:47,887 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:20:47,911 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 20:20:47,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 20:20:47,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:47,920 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:47,921 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:47,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:47,928 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-21 20:20:47,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:47,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183685165] [2020-07-21 20:20:47,939 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 20:20:48,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:48,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:48,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:20:48,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:48,109 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:20:48,156 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 20:20:48,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:20:48,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183685165] [2020-07-21 20:20:48,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:20:48,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:20:48,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029565956] [2020-07-21 20:20:48,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:20:48,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:48,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:20:48,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:20:48,185 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-07-21 20:20:48,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:48,363 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-07-21 20:20:48,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:20:48,366 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 20:20:48,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:48,377 INFO L225 Difference]: With dead ends: 56 [2020-07-21 20:20:48,377 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 20:20:48,383 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 20:20:48,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 20:20:48,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-21 20:20:48,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 20:20:48,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-07-21 20:20:48,437 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2020-07-21 20:20:48,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:48,438 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-07-21 20:20:48,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:20:48,439 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-07-21 20:20:48,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 20:20:48,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:48,441 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 20:20:48,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:48,657 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:48,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:48,658 INFO L82 PathProgramCache]: Analyzing trace with hash -955555818, now seen corresponding path program 1 times [2020-07-21 20:20:48,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:48,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221274319] [2020-07-21 20:20:48,660 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 20:20:48,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:48,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:48,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 20:20:48,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:48,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:48,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:48,833 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:48,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221274319] [2020-07-21 20:20:48,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:48,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 20:20:48,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372112395] [2020-07-21 20:20:48,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:20:48,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:48,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:20:48,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:20:48,844 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2020-07-21 20:20:48,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:48,986 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2020-07-21 20:20:48,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:20:48,988 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-21 20:20:48,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:48,992 INFO L225 Difference]: With dead ends: 51 [2020-07-21 20:20:48,993 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 20:20:48,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:20:48,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 20:20:49,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-07-21 20:20:49,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 20:20:49,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-07-21 20:20:49,023 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 20 [2020-07-21 20:20:49,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:49,024 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-07-21 20:20:49,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:20:49,026 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-07-21 20:20:49,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 20:20:49,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:49,031 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:49,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:49,246 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:49,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:49,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1732065724, now seen corresponding path program 2 times [2020-07-21 20:20:49,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:49,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99289590] [2020-07-21 20:20:49,249 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 20:20:49,309 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:49,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:49,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 20:20:49,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:49,389 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:49,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:49,521 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:49,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99289590] [2020-07-21 20:20:49,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:49,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 20:20:49,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331754920] [2020-07-21 20:20:49,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:20:49,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:49,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:20:49,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:20:49,526 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 12 states. [2020-07-21 20:20:49,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:49,763 INFO L93 Difference]: Finished difference Result 101 states and 126 transitions. [2020-07-21 20:20:49,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:20:49,764 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-21 20:20:49,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:49,766 INFO L225 Difference]: With dead ends: 101 [2020-07-21 20:20:49,766 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 20:20:49,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:20:49,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 20:20:49,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-21 20:20:49,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 20:20:49,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2020-07-21 20:20:49,783 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 26 [2020-07-21 20:20:49,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:49,784 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2020-07-21 20:20:49,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:20:49,784 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2020-07-21 20:20:49,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 20:20:49,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:49,786 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:49,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:50,000 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:50,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:50,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1818054536, now seen corresponding path program 3 times [2020-07-21 20:20:50,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:50,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743606555] [2020-07-21 20:20:50,004 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 20:20:50,115 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:50,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:50,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 20:20:50,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:50,270 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:50,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:50,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743606555] [2020-07-21 20:20:50,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:50,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 20:20:50,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91217332] [2020-07-21 20:20:50,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 20:20:50,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:50,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 20:20:50,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:20:50,596 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand 24 states. [2020-07-21 20:20:51,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:51,098 INFO L93 Difference]: Finished difference Result 209 states and 264 transitions. [2020-07-21 20:20:51,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 20:20:51,099 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 38 [2020-07-21 20:20:51,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:51,101 INFO L225 Difference]: With dead ends: 209 [2020-07-21 20:20:51,103 INFO L226 Difference]: Without dead ends: 164 [2020-07-21 20:20:51,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:20:51,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-21 20:20:51,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 144. [2020-07-21 20:20:51,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 20:20:51,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 166 transitions. [2020-07-21 20:20:51,130 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 166 transitions. Word has length 38 [2020-07-21 20:20:51,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:51,130 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 166 transitions. [2020-07-21 20:20:51,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 20:20:51,130 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 166 transitions. [2020-07-21 20:20:51,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 20:20:51,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:51,133 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:51,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:51,348 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:51,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:51,349 INFO L82 PathProgramCache]: Analyzing trace with hash -2091023072, now seen corresponding path program 4 times [2020-07-21 20:20:51,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:51,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374025023] [2020-07-21 20:20:51,351 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 20:20:52,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:52,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:52,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 20:20:52,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:52,717 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:52,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:53,759 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:20:53,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374025023] [2020-07-21 20:20:53,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:53,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 20:20:53,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646591649] [2020-07-21 20:20:53,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 20:20:53,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:53,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 20:20:53,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 20:20:53,764 INFO L87 Difference]: Start difference. First operand 144 states and 166 transitions. Second operand 48 states. [2020-07-21 20:20:54,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:54,664 INFO L93 Difference]: Finished difference Result 425 states and 540 transitions. [2020-07-21 20:20:54,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 20:20:54,665 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 62 [2020-07-21 20:20:54,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:54,668 INFO L225 Difference]: With dead ends: 425 [2020-07-21 20:20:54,669 INFO L226 Difference]: Without dead ends: 332 [2020-07-21 20:20:54,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 20:20:54,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2020-07-21 20:20:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 288. [2020-07-21 20:20:54,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 20:20:54,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 334 transitions. [2020-07-21 20:20:54,702 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 334 transitions. Word has length 62 [2020-07-21 20:20:54,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:54,703 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 334 transitions. [2020-07-21 20:20:54,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 20:20:54,703 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 334 transitions. [2020-07-21 20:20:54,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-21 20:20:54,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:54,707 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:54,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:54,921 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:54,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:54,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1687296080, now seen corresponding path program 5 times [2020-07-21 20:20:54,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:54,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884134839] [2020-07-21 20:20:54,923 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 20:21:49,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:21:49,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:21:50,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 20:21:50,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:21:51,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2118 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:21:51,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:21:55,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2118 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 20:21:55,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884134839] [2020-07-21 20:21:55,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:21:55,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 20:21:55,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330252163] [2020-07-21 20:21:55,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 20:21:55,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:21:55,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 20:21:55,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 20:21:55,707 INFO L87 Difference]: Start difference. First operand 288 states and 334 transitions. Second operand 96 states. [2020-07-21 20:21:59,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:21:59,333 INFO L93 Difference]: Finished difference Result 857 states and 1092 transitions. [2020-07-21 20:21:59,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 20:21:59,337 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 110 [2020-07-21 20:21:59,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:21:59,346 INFO L225 Difference]: With dead ends: 857 [2020-07-21 20:21:59,346 INFO L226 Difference]: Without dead ends: 668 [2020-07-21 20:21:59,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 20:21:59,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2020-07-21 20:21:59,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 576. [2020-07-21 20:21:59,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 20:21:59,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 670 transitions. [2020-07-21 20:21:59,434 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 670 transitions. Word has length 110 [2020-07-21 20:21:59,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:21:59,434 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 670 transitions. [2020-07-21 20:21:59,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 20:21:59,435 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 670 transitions. [2020-07-21 20:21:59,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2020-07-21 20:21:59,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:21:59,449 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:21:59,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:21:59,666 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:21:59,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:21:59,667 INFO L82 PathProgramCache]: Analyzing trace with hash 292282032, now seen corresponding path program 6 times [2020-07-21 20:21:59,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:21:59,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892831253] [2020-07-21 20:21:59,668 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