/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:14:30,858 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:14:30,861 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:14:30,873 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:14:30,874 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:14:30,875 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:14:30,876 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:14:30,878 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:14:30,880 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:14:30,881 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:14:30,882 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:14:30,883 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:14:30,883 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:14:30,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:14:30,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:14:30,889 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:14:30,892 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:14:30,893 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:14:30,897 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:14:30,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:14:30,907 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:14:30,908 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:14:30,912 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:14:30,913 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:14:30,915 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:14:30,933 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:14:30,934 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:14:30,936 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:14:30,937 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 [2020-07-20 14:14:30,960 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:14:30,960 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:14:30,962 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:14:30,962 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:14:30,962 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:14:30,963 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:14:30,963 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:14:30,963 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:14:30,963 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:14:30,963 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:14:30,964 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:14:30,964 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:14:30,965 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:14:30,965 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:14:30,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:14:30,965 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:14:30,966 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:14:30,966 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:14:30,966 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:14:30,966 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:14:30,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:14:30,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:14:30,967 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:14:30,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:14:30,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:14:30,967 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:14:30,968 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:30,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:14:30,968 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:14:30,968 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:14:31,318 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:14:31,332 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:14:31,338 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:14:31,340 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:14:31,340 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:14:31,341 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 14:14:31,427 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f2768274/a3d21bc19dfb4559a97e61b298942f78/FLAG5285d24bf [2020-07-20 14:14:31,872 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:14:31,872 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 14:14:31,881 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f2768274/a3d21bc19dfb4559a97e61b298942f78/FLAG5285d24bf [2020-07-20 14:14:32,229 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3f2768274/a3d21bc19dfb4559a97e61b298942f78 [2020-07-20 14:14:32,238 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:14:32,240 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:14:32,241 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:14:32,241 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:14:32,245 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:14:32,246 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,249 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d14c7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32, skipping insertion in model container [2020-07-20 14:14:32,250 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,257 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:14:32,276 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:14:32,466 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:14:32,474 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:14:32,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:14:32,508 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:14:32,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32 WrapperNode [2020-07-20 14:14:32,509 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:14:32,510 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:14:32,510 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:14:32,510 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:14:32,603 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,604 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,621 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,626 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (1/1) ... [2020-07-20 14:14:32,630 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:14:32,631 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:14:32,631 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:14:32,631 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:14:32,632 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (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 [2020-07-20 14:14:32,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:14:32,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:14:32,696 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:14:32,696 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-20 14:14:32,696 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:14:32,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:14:32,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:14:32,697 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 14:14:32,697 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-20 14:14:32,697 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 14:14:32,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 14:14:32,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:14:32,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:14:32,977 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:14:32,978 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 14:14:32,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:14:32 BoogieIcfgContainer [2020-07-20 14:14:32,982 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:14:32,987 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:14:32,987 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:14:32,991 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:14:32,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:14:32" (1/3) ... [2020-07-20 14:14:32,995 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13f05768 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:14:32, skipping insertion in model container [2020-07-20 14:14:32,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:14:32" (2/3) ... [2020-07-20 14:14:32,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13f05768 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:14:32, skipping insertion in model container [2020-07-20 14:14:32,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:14:32" (3/3) ... [2020-07-20 14:14:33,000 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-20 14:14:33,026 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:14:33,033 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:14:33,047 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:14:33,068 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:14:33,068 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:14:33,068 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:14:33,068 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:14:33,069 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:14:33,069 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:14:33,069 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:14:33,069 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:14:33,085 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 14:14:33,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 14:14:33,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:33,091 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:33,092 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:33,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:33,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-20 14:14:33,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:33,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898223078] [2020-07-20 14:14:33,106 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 [2020-07-20 14:14:33,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:14:33,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:33,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 14:14:33,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:33,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:33,286 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:14:33,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898223078] [2020-07-20 14:14:33,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:14:33,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:14:33,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372112395] [2020-07-20 14:14:33,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:14:33,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:33,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:14:33,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:14:33,310 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-20 14:14:33,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:33,386 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-20 14:14:33,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 14:14:33,388 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-20 14:14:33,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:33,397 INFO L225 Difference]: With dead ends: 60 [2020-07-20 14:14:33,398 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 14:14:33,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 14:14:33,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 14:14:33,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-20 14:14:33,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 14:14:33,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 14:14:33,443 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-20 14:14:33,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:33,444 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 14:14:33,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:14:33,444 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 14:14:33,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 14:14:33,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:33,446 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:33,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:33,661 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:33,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:33,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-20 14:14:33,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:33,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354527721] [2020-07-20 14:14:33,664 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 [2020-07-20 14:14:33,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:14:33,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:33,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:14:33,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:33,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:14:33,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:33,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354527721] [2020-07-20 14:14:33,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:14:33,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 14:14:33,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667382389] [2020-07-20 14:14:33,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:14:33,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:33,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:14:33,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:14:33,915 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 8 states. [2020-07-20 14:14:33,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:33,985 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2020-07-20 14:14:33,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 14:14:33,986 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 14:14:33,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:33,988 INFO L225 Difference]: With dead ends: 55 [2020-07-20 14:14:33,988 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 14:14:33,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-20 14:14:33,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 14:14:33,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 14:14:33,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 14:14:33,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 14:14:33,998 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 22 [2020-07-20 14:14:33,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:33,998 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 14:14:33,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:14:33,999 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 14:14:34,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 14:14:34,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:34,002 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:34,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:34,216 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:34,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:34,217 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 2 times [2020-07-20 14:14:34,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:34,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813246445] [2020-07-20 14:14:34,219 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 [2020-07-20 14:14:34,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:14:34,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:34,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 14:14:34,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:34,434 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:34,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:14:34,614 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:34,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813246445] [2020-07-20 14:14:34,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:14:34,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 14:14:34,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094645138] [2020-07-20 14:14:34,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 14:14:34,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:34,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 14:14:34,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:14:34,617 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2020-07-20 14:14:34,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:34,715 INFO L93 Difference]: Finished difference Result 67 states and 80 transitions. [2020-07-20 14:14:34,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 14:14:34,716 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2020-07-20 14:14:34,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:34,717 INFO L225 Difference]: With dead ends: 67 [2020-07-20 14:14:34,718 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 14:14:34,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:14:34,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 14:14:34,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-07-20 14:14:34,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 14:14:34,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-07-20 14:14:34,727 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 28 [2020-07-20 14:14:34,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:34,727 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-07-20 14:14:34,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 14:14:34,728 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-07-20 14:14:34,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 14:14:34,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:34,729 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:34,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:34,944 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:34,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:34,944 INFO L82 PathProgramCache]: Analyzing trace with hash -619729958, now seen corresponding path program 3 times [2020-07-20 14:14:34,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:34,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872996087] [2020-07-20 14:14:34,946 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 [2020-07-20 14:14:35,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:14:35,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:35,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 14:14:35,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:35,700 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:35,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:14:36,167 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:14:36,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872996087] [2020-07-20 14:14:36,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:14:36,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 14:14:36,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031484857] [2020-07-20 14:14:36,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:14:36,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:36,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:14:36,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:14:36,171 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 26 states. [2020-07-20 14:14:36,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:36,355 INFO L93 Difference]: Finished difference Result 91 states and 110 transitions. [2020-07-20 14:14:36,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 14:14:36,359 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 40 [2020-07-20 14:14:36,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:36,360 INFO L225 Difference]: With dead ends: 91 [2020-07-20 14:14:36,361 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 14:14:36,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-20 14:14:36,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 14:14:36,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2020-07-20 14:14:36,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 14:14:36,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2020-07-20 14:14:36,379 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 40 [2020-07-20 14:14:36,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:36,379 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2020-07-20 14:14:36,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:14:36,379 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2020-07-20 14:14:36,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-07-20 14:14:36,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:36,384 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:36,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:36,600 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:36,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:36,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2145776910, now seen corresponding path program 4 times [2020-07-20 14:14:36,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:36,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826820562] [2020-07-20 14:14:36,603 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 [2020-07-20 14:14:44,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:14:44,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:44,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 14:14:44,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:44,969 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 14:14:44,970 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:14:44,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826820562] [2020-07-20 14:14:44,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:14:44,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:14:44,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875130072] [2020-07-20 14:14:44,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:14:44,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:44,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:14:44,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:14:44,975 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand 3 states. [2020-07-20 14:14:45,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:45,005 INFO L93 Difference]: Finished difference Result 91 states and 100 transitions. [2020-07-20 14:14:45,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:14:45,007 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 64 [2020-07-20 14:14:45,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:45,011 INFO L225 Difference]: With dead ends: 91 [2020-07-20 14:14:45,011 INFO L226 Difference]: Without dead ends: 79 [2020-07-20 14:14:45,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:14:45,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-20 14:14:45,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-20 14:14:45,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 14:14:45,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-07-20 14:14:45,034 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 64 [2020-07-20 14:14:45,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:45,034 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-07-20 14:14:45,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:14:45,035 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-07-20 14:14:45,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 14:14:45,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:45,036 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:45,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:45,241 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:45,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:45,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1850308843, now seen corresponding path program 1 times [2020-07-20 14:14:45,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:45,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361999866] [2020-07-20 14:14:45,243 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 [2020-07-20 14:14:45,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:14:45,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:45,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 14:14:45,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:45,942 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 14:14:45,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:14:45,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361999866] [2020-07-20 14:14:45,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:14:45,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:14:45,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103117225] [2020-07-20 14:14:45,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:14:45,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:45,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:14:45,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:14:45,952 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 3 states. [2020-07-20 14:14:45,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:45,971 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2020-07-20 14:14:45,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:14:45,971 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 67 [2020-07-20 14:14:45,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:45,973 INFO L225 Difference]: With dead ends: 90 [2020-07-20 14:14:45,973 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 14:14:45,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:14:45,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 14:14:45,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-20 14:14:45,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 14:14:45,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-20 14:14:45,983 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 67 [2020-07-20 14:14:45,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:45,983 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-20 14:14:45,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:14:45,983 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-20 14:14:45,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 14:14:45,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:45,985 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:46,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:46,193 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:46,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:46,194 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 1 times [2020-07-20 14:14:46,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:46,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381435035] [2020-07-20 14:14:46,195 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 [2020-07-20 14:14:56,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:14:56,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:14:56,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 14:14:56,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:14:57,287 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:14:57,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:14:58,742 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:14:58,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381435035] [2020-07-20 14:14:58,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:14:58,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 14:14:58,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270247051] [2020-07-20 14:14:58,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 14:14:58,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:14:58,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 14:14:58,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 14:14:58,747 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-20 14:14:59,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:14:59,153 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-20 14:14:59,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 14:14:59,154 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-20 14:14:59,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:14:59,156 INFO L225 Difference]: With dead ends: 141 [2020-07-20 14:14:59,156 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 14:14:59,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 14:14:59,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 14:14:59,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-20 14:14:59,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 14:14:59,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-20 14:14:59,178 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-20 14:14:59,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:14:59,179 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-20 14:14:59,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 14:14:59,179 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-20 14:14:59,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-20 14:14:59,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:14:59,181 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:14:59,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:14:59,382 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:14:59,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:14:59,383 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 2 times [2020-07-20 14:14:59,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:14:59,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969073653] [2020-07-20 14:14:59,384 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