/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 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 17:36:25,007 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:36:25,011 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:36:25,032 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:36:25,033 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:36:25,035 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:36:25,037 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:36:25,050 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:36:25,054 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:36:25,055 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:36:25,056 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:36:25,059 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:36:25,059 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:36:25,062 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:36:25,066 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:36:25,069 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:36:25,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:36:25,073 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:36:25,075 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:36:25,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:36:25,088 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:36:25,093 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:36:25,094 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:36:25,098 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:36:25,101 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:36:25,112 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:36:25,113 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:36:25,115 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:36:25,116 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 17:36:25,156 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:36:25,157 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:36:25,160 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:36:25,161 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:36:25,161 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:36:25,161 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:36:25,161 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:36:25,161 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:36:25,162 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:36:25,162 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:36:25,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:36:25,162 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:36:25,166 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:36:25,166 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:36:25,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:36:25,166 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:36:25,167 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:36:25,167 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:36:25,170 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:36:25,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:36:25,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:36:25,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:36:25,171 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:36:25,172 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:36:25,172 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:36:25,172 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:36:25,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:25,172 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:36:25,173 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:36:25,173 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 -> 4 [2020-07-20 17:36:25,522 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:36:25,537 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:36:25,542 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:36:25,543 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:36:25,544 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:36:25,544 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 17:36:25,616 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e94e0de/b2489bc06dd342d48968bd218d408fee/FLAG72746c6fa [2020-07-20 17:36:26,159 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:36:26,160 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 17:36:26,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e94e0de/b2489bc06dd342d48968bd218d408fee/FLAG72746c6fa [2020-07-20 17:36:26,460 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/34e94e0de/b2489bc06dd342d48968bd218d408fee [2020-07-20 17:36:26,477 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:36:26,480 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:36:26,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:36:26,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:36:26,489 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:36:26,490 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4712803d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26, skipping insertion in model container [2020-07-20 17:36:26,495 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:36:26,527 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:36:26,759 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:36:26,772 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:36:26,795 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:36:26,823 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:36:26,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26 WrapperNode [2020-07-20 17:36:26,825 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:36:26,826 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:36:26,826 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:36:26,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:36:26,945 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,946 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,958 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,959 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,969 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (1/1) ... [2020-07-20 17:36:26,981 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:36:26,982 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:36:26,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:36:26,982 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:36:26,984 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (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 17:36:27,057 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:36:27,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:36:27,058 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:36:27,059 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-20 17:36:27,059 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:36:27,059 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:36:27,059 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:36:27,060 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 17:36:27,060 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-20 17:36:27,060 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 17:36:27,060 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 17:36:27,060 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 17:36:27,061 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:36:27,061 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:36:27,061 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 17:36:27,061 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:36:27,061 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:36:27,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:36:27,376 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:36:27,376 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:36:27,384 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:36:27 BoogieIcfgContainer [2020-07-20 17:36:27,384 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:36:27,386 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:36:27,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:36:27,394 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:36:27,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:36:26" (1/3) ... [2020-07-20 17:36:27,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f906504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:36:27, skipping insertion in model container [2020-07-20 17:36:27,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:36:26" (2/3) ... [2020-07-20 17:36:27,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f906504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:36:27, skipping insertion in model container [2020-07-20 17:36:27,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:36:27" (3/3) ... [2020-07-20 17:36:27,400 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-20 17:36:27,420 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:36:27,433 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:36:27,455 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:36:27,488 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:36:27,488 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:36:27,488 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:36:27,488 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:36:27,489 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:36:27,489 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:36:27,489 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:36:27,490 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:36:27,517 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 17:36:27,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:36:27,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:27,528 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 17:36:27,529 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:27,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:27,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-20 17:36:27,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:27,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237570538] [2020-07-20 17:36:27,545 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 17:36:27,659 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:36:27,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:27,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:36:27,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:27,756 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 17:36:27,756 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:36:27,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237570538] [2020-07-20 17:36:27,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:36:27,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 17:36:27,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063057099] [2020-07-20 17:36:27,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 17:36:27,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:27,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 17:36:27,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:36:27,787 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-20 17:36:27,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:27,894 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-20 17:36:27,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 17:36:27,897 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-20 17:36:27,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:27,918 INFO L225 Difference]: With dead ends: 60 [2020-07-20 17:36:27,919 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 17:36:27,927 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 17:36:27,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 17:36:27,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-20 17:36:27,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 17:36:27,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 17:36:28,002 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-20 17:36:28,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:28,003 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 17:36:28,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 17:36:28,004 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 17:36:28,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:36:28,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:28,007 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 17:36:28,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:28,224 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:28,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:28,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-20 17:36:28,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:28,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887605795] [2020-07-20 17:36:28,226 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 17:36:28,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:36:28,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:28,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:36:28,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:28,338 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 17:36:28,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:36:28,447 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 17:36:28,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887605795] [2020-07-20 17:36:28,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:36:28,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 17:36:28,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027412327] [2020-07-20 17:36:28,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:36:28,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:28,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:36:28,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:36:28,453 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 8 states. [2020-07-20 17:36:28,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:28,543 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2020-07-20 17:36:28,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:36:28,544 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 17:36:28,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:28,545 INFO L225 Difference]: With dead ends: 55 [2020-07-20 17:36:28,546 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 17:36:28,548 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 [2020-07-20 17:36:28,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 17:36:28,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 17:36:28,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 17:36:28,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 17:36:28,573 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 22 [2020-07-20 17:36:28,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:28,575 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 17:36:28,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:36:28,577 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 17:36:28,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:36:28,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:28,581 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 17:36:28,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:28,796 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:28,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:28,797 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 2 times [2020-07-20 17:36:28,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:28,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663216479] [2020-07-20 17:36:28,799 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 17:36:28,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:36:28,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:28,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:36:28,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:29,062 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 17:36:29,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:36:29,261 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 17:36:29,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663216479] [2020-07-20 17:36:29,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:36:29,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 17:36:29,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293059528] [2020-07-20 17:36:29,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:36:29,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:29,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:36:29,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:36:29,266 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2020-07-20 17:36:29,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:29,399 INFO L93 Difference]: Finished difference Result 67 states and 80 transitions. [2020-07-20 17:36:29,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 17:36:29,400 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2020-07-20 17:36:29,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:29,402 INFO L225 Difference]: With dead ends: 67 [2020-07-20 17:36:29,402 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 17:36:29,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:36:29,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 17:36:29,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-07-20 17:36:29,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 17:36:29,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-07-20 17:36:29,414 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 28 [2020-07-20 17:36:29,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:29,414 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-07-20 17:36:29,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:36:29,414 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-07-20 17:36:29,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 17:36:29,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:29,417 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 17:36:29,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:29,632 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:29,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:29,633 INFO L82 PathProgramCache]: Analyzing trace with hash -619729958, now seen corresponding path program 3 times [2020-07-20 17:36:29,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:29,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373816120] [2020-07-20 17:36:29,634 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 17:36:30,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:36:30,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:30,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 17:36:30,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:30,780 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 17:36:30,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:36:31,364 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 17:36:31,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373816120] [2020-07-20 17:36:31,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:36:31,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 17:36:31,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966738215] [2020-07-20 17:36:31,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:36:31,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:31,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:36:31,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:36:31,368 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 26 states. [2020-07-20 17:36:31,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:31,626 INFO L93 Difference]: Finished difference Result 91 states and 110 transitions. [2020-07-20 17:36:31,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:36:31,628 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 40 [2020-07-20 17:36:31,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:31,632 INFO L225 Difference]: With dead ends: 91 [2020-07-20 17:36:31,633 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 17:36:31,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:36:31,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 17:36:31,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2020-07-20 17:36:31,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 17:36:31,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2020-07-20 17:36:31,649 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 40 [2020-07-20 17:36:31,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:31,649 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2020-07-20 17:36:31,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:36:31,649 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2020-07-20 17:36:31,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-07-20 17:36:31,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:31,652 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 17:36:31,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:31,866 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:31,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:31,867 INFO L82 PathProgramCache]: Analyzing trace with hash -2145776910, now seen corresponding path program 4 times [2020-07-20 17:36:31,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:31,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467053203] [2020-07-20 17:36:31,867 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 17:36:51,023 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:36:51,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:51,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:36:51,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:51,210 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 17:36:51,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:36:51,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467053203] [2020-07-20 17:36:51,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:36:51,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:36:51,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789961359] [2020-07-20 17:36:51,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:36:51,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:51,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:36:51,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:36:51,215 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand 3 states. [2020-07-20 17:36:51,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:51,251 INFO L93 Difference]: Finished difference Result 91 states and 100 transitions. [2020-07-20 17:36:51,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:36:51,251 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 64 [2020-07-20 17:36:51,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:51,257 INFO L225 Difference]: With dead ends: 91 [2020-07-20 17:36:51,258 INFO L226 Difference]: Without dead ends: 79 [2020-07-20 17:36:51,259 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 17:36:51,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-07-20 17:36:51,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-07-20 17:36:51,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 17:36:51,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-07-20 17:36:51,275 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 64 [2020-07-20 17:36:51,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:51,275 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-07-20 17:36:51,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:36:51,276 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-07-20 17:36:51,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 17:36:51,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:51,278 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 17:36:51,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:51,479 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:51,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:51,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1850308843, now seen corresponding path program 1 times [2020-07-20 17:36:51,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:51,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581496734] [2020-07-20 17:36:51,481 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 17:36:52,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:36:52,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:36:52,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:36:52,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:36:52,553 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 17:36:52,553 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:36:52,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581496734] [2020-07-20 17:36:52,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:36:52,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:36:52,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319262304] [2020-07-20 17:36:52,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:36:52,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:36:52,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:36:52,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:36:52,556 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 3 states. [2020-07-20 17:36:52,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:36:52,581 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2020-07-20 17:36:52,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:36:52,582 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 67 [2020-07-20 17:36:52,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:36:52,583 INFO L225 Difference]: With dead ends: 90 [2020-07-20 17:36:52,584 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 17:36:52,588 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 17:36:52,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 17:36:52,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-20 17:36:52,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 17:36:52,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-20 17:36:52,609 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 67 [2020-07-20 17:36:52,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:36:52,610 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-20 17:36:52,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:36:52,614 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-20 17:36:52,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 17:36:52,615 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:36:52,616 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 17:36:52,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:36:52,834 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:36:52,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:36:52,835 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 1 times [2020-07-20 17:36:52,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:36:52,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929021572] [2020-07-20 17:36:52,836 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 17:37:05,746 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:37:05,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:37:05,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 17:37:05,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:37:06,480 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 17:37:06,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:37:08,137 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 17:37:08,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929021572] [2020-07-20 17:37:08,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:37:08,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 17:37:08,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854331992] [2020-07-20 17:37:08,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 17:37:08,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:37:08,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 17:37:08,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 17:37:08,141 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-20 17:37:08,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:37:08,610 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-20 17:37:08,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 17:37:08,611 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-20 17:37:08,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:37:08,614 INFO L225 Difference]: With dead ends: 141 [2020-07-20 17:37:08,614 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 17:37:08,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 17:37:08,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 17:37:08,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-20 17:37:08,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 17:37:08,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-20 17:37:08,631 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-20 17:37:08,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:37:08,632 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-20 17:37:08,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 17:37:08,632 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-20 17:37:08,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-20 17:37:08,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:37:08,634 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 17:37:08,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:37:08,849 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:37:08,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:37:08,850 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 2 times [2020-07-20 17:37:08,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:37:08,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847558255] [2020-07-20 17:37:08,851 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