/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:40:51,928 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:40:51,930 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:40:51,944 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:40:51,944 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:40:51,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:40:51,947 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:40:51,950 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:40:51,951 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:40:51,954 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:40:51,955 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:40:51,957 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:40:51,958 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:40:51,959 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:40:51,960 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:40:51,961 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:40:51,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:40:51,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:40:51,974 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:40:51,977 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:40:51,978 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:40:51,979 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:40:51,981 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:40:51,981 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:40:51,984 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:40:51,992 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:40:51,993 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:40:51,994 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:40:51,995 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:40:52,010 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:40:52,011 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:40:52,012 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:40:52,012 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:40:52,013 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:40:52,013 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:40:52,013 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:40:52,013 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:40:52,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:40:52,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:40:52,014 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:40:52,014 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:40:52,014 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:40:52,015 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:40:52,015 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:40:52,015 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:40:52,015 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:40:52,015 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:40:52,016 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:40:52,016 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:40:52,016 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:40:52,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:40:52,016 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:40:52,017 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:40:52,017 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:40:52,017 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:40:52,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:52,017 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:40:52,018 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:40:52,018 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:40:52,316 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:40:52,330 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:40:52,333 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:40:52,334 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:40:52,335 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:40:52,336 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 16:40:52,421 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cef65768d/4374d144eb1b4f448f560d11910d93f2/FLAGb16774683 [2020-07-21 16:40:52,909 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:40:52,910 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 16:40:52,918 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cef65768d/4374d144eb1b4f448f560d11910d93f2/FLAGb16774683 [2020-07-21 16:40:53,264 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cef65768d/4374d144eb1b4f448f560d11910d93f2 [2020-07-21 16:40:53,273 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:40:53,276 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:40:53,277 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:40:53,277 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:40:53,283 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:40:53,284 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,287 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42df05be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53, skipping insertion in model container [2020-07-21 16:40:53,287 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,294 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:40:53,311 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:40:53,526 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:40:53,534 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:40:53,552 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:40:53,568 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:40:53,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53 WrapperNode [2020-07-21 16:40:53,568 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:40:53,569 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:40:53,569 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:40:53,569 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:40:53,666 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,668 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,696 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,703 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,704 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... [2020-07-21 16:40:53,706 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:40:53,707 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:40:53,707 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:40:53,707 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:40:53,708 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:40:53,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:40:53,760 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:40:53,760 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:40:53,760 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-21 16:40:53,761 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:40:53,761 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:40:53,761 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:40:53,761 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 16:40:53,761 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:40:53,762 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 16:40:53,763 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:40:53,763 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:40:53,763 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:40:54,026 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:40:54,027 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 16:40:54,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:40:54 BoogieIcfgContainer [2020-07-21 16:40:54,032 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:40:54,034 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:40:54,034 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:40:54,038 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:40:54,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:40:53" (1/3) ... [2020-07-21 16:40:54,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ab9001a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:40:54, skipping insertion in model container [2020-07-21 16:40:54,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:40:53" (2/3) ... [2020-07-21 16:40:54,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ab9001a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:40:54, skipping insertion in model container [2020-07-21 16:40:54,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:40:54" (3/3) ... [2020-07-21 16:40:54,042 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-21 16:40:54,054 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:40:54,064 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:40:54,099 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:40:54,157 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:40:54,157 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:40:54,158 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:40:54,159 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:40:54,159 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:40:54,159 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:40:54,162 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:40:54,162 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:40:54,188 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:40:54,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:40:54,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:54,193 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] [2020-07-21 16:40:54,194 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:54,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:54,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-21 16:40:54,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:54,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771202394] [2020-07-21 16:40:54,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:54,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:40:54,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:54,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:40:54,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:54,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:40:54,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:40:54,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771202394] [2020-07-21 16:40:54,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:40:54,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:40:54,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726388545] [2020-07-21 16:40:54,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:40:54,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:54,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:40:54,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:40:54,426 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-21 16:40:54,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:54,505 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-21 16:40:54,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:40:54,507 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-21 16:40:54,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:54,518 INFO L225 Difference]: With dead ends: 60 [2020-07-21 16:40:54,518 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:40:54,522 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 [2020-07-21 16:40:54,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:40:54,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-21 16:40:54,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 16:40:54,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 16:40:54,574 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-21 16:40:54,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:54,574 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 16:40:54,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:40:54,575 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 16:40:54,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:40:54,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:54,576 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] [2020-07-21 16:40:54,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:54,792 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:54,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:54,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-21 16:40:54,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:54,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126562633] [2020-07-21 16:40:54,796 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:54,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:40:54,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:54,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 16:40:54,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:54,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:40:54,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:40:55,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:40:55,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126562633] [2020-07-21 16:40:55,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:40:55,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 16:40:55,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747153074] [2020-07-21 16:40:55,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:40:55,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:55,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:40:55,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:40:55,063 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 8 states. [2020-07-21 16:40:55,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:55,131 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2020-07-21 16:40:55,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:40:55,131 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 16:40:55,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:55,133 INFO L225 Difference]: With dead ends: 55 [2020-07-21 16:40:55,133 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 16:40:55,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:40:55,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 16:40:55,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 16:40:55,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:40:55,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 16:40:55,143 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 22 [2020-07-21 16:40:55,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:55,143 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 16:40:55,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:40:55,144 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 16:40:55,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:40:55,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:55,145 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] [2020-07-21 16:40:55,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:55,360 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:55,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:55,361 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 2 times [2020-07-21 16:40:55,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:55,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395685924] [2020-07-21 16:40:55,363 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:55,435 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:40:55,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:55,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:40:55,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:55,454 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:40:55,456 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:40:55,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395685924] [2020-07-21 16:40:55,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:40:55,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:40:55,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959291181] [2020-07-21 16:40:55,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:40:55,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:55,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:40:55,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:40:55,471 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 3 states. [2020-07-21 16:40:55,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:55,513 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 16:40:55,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:40:55,513 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:40:55,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:55,516 INFO L225 Difference]: With dead ends: 55 [2020-07-21 16:40:55,517 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 16:40:55,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:40:55,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 16:40:55,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2020-07-21 16:40:55,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:40:55,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-07-21 16:40:55,529 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 28 [2020-07-21 16:40:55,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:55,530 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-07-21 16:40:55,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:40:55,530 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-07-21 16:40:55,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:40:55,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:55,531 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, 1, 1, 1] [2020-07-21 16:40:55,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:55,733 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:55,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:55,734 INFO L82 PathProgramCache]: Analyzing trace with hash 630969145, now seen corresponding path program 1 times [2020-07-21 16:40:55,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:55,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750045455] [2020-07-21 16:40:55,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:55,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:40:55,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:55,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:40:55,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:55,806 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 16:40:55,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:40:55,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750045455] [2020-07-21 16:40:55,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:40:55,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:40:55,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661149248] [2020-07-21 16:40:55,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:40:55,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:55,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:40:55,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:40:55,809 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 3 states. [2020-07-21 16:40:55,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:55,826 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-07-21 16:40:55,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:40:55,826 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 16:40:55,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:55,828 INFO L225 Difference]: With dead ends: 54 [2020-07-21 16:40:55,828 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:40:55,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:40:55,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:40:55,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 16:40:55,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:40:55,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-21 16:40:55,835 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 31 [2020-07-21 16:40:55,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:55,835 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-21 16:40:55,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:40:55,835 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-21 16:40:55,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:40:55,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:55,837 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, 1, 1, 1] [2020-07-21 16:40:56,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:56,050 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:56,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:56,051 INFO L82 PathProgramCache]: Analyzing trace with hash 237942135, now seen corresponding path program 1 times [2020-07-21 16:40:56,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:56,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688890703] [2020-07-21 16:40:56,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:56,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:40:56,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:56,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:40:56,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:56,186 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:40:56,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:40:56,335 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:40:56,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688890703] [2020-07-21 16:40:56,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:40:56,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 16:40:56,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496071852] [2020-07-21 16:40:56,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:40:56,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:56,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:40:56,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:40:56,338 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 14 states. [2020-07-21 16:40:56,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:56,428 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2020-07-21 16:40:56,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:40:56,429 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 16:40:56,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:56,430 INFO L225 Difference]: With dead ends: 69 [2020-07-21 16:40:56,430 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:40:56,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:40:56,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:40:56,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 16:40:56,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 16:40:56,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-21 16:40:56,439 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 31 [2020-07-21 16:40:56,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:56,440 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-21 16:40:56,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:40:56,440 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-21 16:40:56,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 16:40:56,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:56,442 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, 1, 1, 1] [2020-07-21 16:40:56,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:56,655 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:56,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:56,657 INFO L82 PathProgramCache]: Analyzing trace with hash -2007416981, now seen corresponding path program 2 times [2020-07-21 16:40:56,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:56,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748502025] [2020-07-21 16:40:56,658 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:57,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:40:57,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:40:57,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:40:57,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:40:57,323 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:40:57,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:40:57,795 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:40:57,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748502025] [2020-07-21 16:40:57,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:40:57,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 16:40:57,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114063189] [2020-07-21 16:40:57,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:40:57,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:40:57,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:40:57,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:40:57,803 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 26 states. [2020-07-21 16:40:58,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:40:58,018 INFO L93 Difference]: Finished difference Result 93 states and 110 transitions. [2020-07-21 16:40:58,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:40:58,021 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 43 [2020-07-21 16:40:58,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:40:58,023 INFO L225 Difference]: With dead ends: 93 [2020-07-21 16:40:58,023 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 16:40:58,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:40:58,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 16:40:58,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-21 16:40:58,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 16:40:58,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-21 16:40:58,044 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 43 [2020-07-21 16:40:58,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:40:58,045 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-21 16:40:58,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:40:58,045 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-21 16:40:58,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:40:58,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:40:58,051 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] [2020-07-21 16:40:58,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:40:58,253 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:40:58,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:40:58,253 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 3 times [2020-07-21 16:40:58,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:40:58,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197833912] [2020-07-21 16:40:58,255 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:41:01,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:41:01,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:41:01,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:41:01,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:41:02,177 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:41:02,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:41:03,633 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:41:03,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197833912] [2020-07-21 16:41:03,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:41:03,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 16:41:03,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741814700] [2020-07-21 16:41:03,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 16:41:03,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:41:03,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 16:41:03,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:41:03,638 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-21 16:41:04,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:41:04,075 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-21 16:41:04,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 16:41:04,077 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-21 16:41:04,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:41:04,079 INFO L225 Difference]: With dead ends: 141 [2020-07-21 16:41:04,079 INFO L226 Difference]: Without dead ends: 120 [2020-07-21 16:41:04,083 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 [2020-07-21 16:41:04,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-21 16:41:04,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-21 16:41:04,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 16:41:04,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-21 16:41:04,098 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-21 16:41:04,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:41:04,098 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-21 16:41:04,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 16:41:04,099 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-21 16:41:04,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-21 16:41:04,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:41:04,101 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] [2020-07-21 16:41:04,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:41:04,302 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:41:04,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:41:04,303 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 4 times [2020-07-21 16:41:04,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:41:04,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463596956] [2020-07-21 16:41:04,304 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in