/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:37:57,465 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:37:57,469 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:37:57,489 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:37:57,490 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:37:57,492 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:37:57,494 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:37:57,505 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:37:57,510 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:37:57,513 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:37:57,515 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:37:57,516 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:37:57,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:37:57,519 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:37:57,521 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:37:57,522 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:37:57,524 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:37:57,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:37:57,526 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:37:57,536 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:37:57,542 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:37:57,547 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:37:57,548 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:37:57,549 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:37:57,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:37:57,564 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:37:57,565 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:37:57,566 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:37:57,567 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 01:37:57,597 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:37:57,598 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:37:57,601 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:37:57,601 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:37:57,601 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:37:57,602 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:37:57,602 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:37:57,602 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:37:57,602 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:37:57,602 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:37:57,603 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:37:57,604 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:37:57,604 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:37:57,604 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:37:57,605 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:37:57,605 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:37:57,605 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:37:57,605 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:37:57,605 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:37:57,607 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:37:57,607 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:37:57,609 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:37:57,609 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:37:57,610 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:37:57,610 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:37:57,611 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:37:57,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:37:57,611 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:37:57,611 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:37:57,611 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:37:57,945 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:37:57,968 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:37:57,972 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:37:57,973 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:37:57,974 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:37:57,975 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 01:37:58,061 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9248d2592/2900b45f1d7e4da6a6b86aca46f3aa03/FLAG73c508c84 [2020-07-21 01:37:58,584 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:37:58,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 01:37:58,592 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9248d2592/2900b45f1d7e4da6a6b86aca46f3aa03/FLAG73c508c84 [2020-07-21 01:37:58,952 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9248d2592/2900b45f1d7e4da6a6b86aca46f3aa03 [2020-07-21 01:37:58,963 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:37:58,966 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:37:58,967 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:37:58,967 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:37:58,971 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:37:58,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:37:58" (1/1) ... [2020-07-21 01:37:58,976 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5853e384 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:58, skipping insertion in model container [2020-07-21 01:37:58,976 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:37:58" (1/1) ... [2020-07-21 01:37:58,984 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:37:59,004 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:37:59,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:37:59,241 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:37:59,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:37:59,275 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:37:59,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59 WrapperNode [2020-07-21 01:37:59,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:37:59,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:37:59,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:37:59,277 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:37:59,392 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,401 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,401 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,417 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (1/1) ... [2020-07-21 01:37:59,419 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:37:59,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:37:59,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:37:59,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:37:59,421 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (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 01:37:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:37:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:37:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:37:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-21 01:37:59,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 01:37:59,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 01:37:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:37:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 01:37:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 01:37:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 01:37:59,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:37:59,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:37:59,776 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:37:59,776 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 01:37:59,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:37:59 BoogieIcfgContainer [2020-07-21 01:37:59,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:37:59,785 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:37:59,785 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:37:59,789 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:37:59,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:37:58" (1/3) ... [2020-07-21 01:37:59,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fc696b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:37:59, skipping insertion in model container [2020-07-21 01:37:59,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:37:59" (2/3) ... [2020-07-21 01:37:59,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fc696b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:37:59, skipping insertion in model container [2020-07-21 01:37:59,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:37:59" (3/3) ... [2020-07-21 01:37:59,794 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-21 01:37:59,814 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:37:59,826 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:37:59,846 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:37:59,878 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:37:59,879 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:37:59,879 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:37:59,879 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:37:59,879 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:37:59,880 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:37:59,880 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:37:59,880 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:37:59,904 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 01:37:59,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:37:59,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:37:59,913 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 01:37:59,914 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:37:59,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:37:59,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-21 01:37:59,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:37:59,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335486563] [2020-07-21 01:37:59,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:00,036 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:38:00,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:00,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:38:00,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:00,123 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 01:38:00,124 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:38:00,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335486563] [2020-07-21 01:38:00,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:38:00,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 01:38:00,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356221492] [2020-07-21 01:38:00,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 01:38:00,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:00,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 01:38:00,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 01:38:00,151 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-07-21 01:38:00,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:00,234 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2020-07-21 01:38:00,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 01:38:00,236 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-07-21 01:38:00,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:00,246 INFO L225 Difference]: With dead ends: 60 [2020-07-21 01:38:00,246 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 01:38:00,251 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 01:38:00,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 01:38:00,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-21 01:38:00,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 01:38:00,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 01:38:00,297 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-21 01:38:00,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:00,297 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 01:38:00,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 01:38:00,298 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 01:38:00,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:38:00,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:00,299 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 01:38:00,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:00,506 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:00,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:00,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-07-21 01:38:00,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:00,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607783049] [2020-07-21 01:38:00,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:00,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:38:00,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:00,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:38:00,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:00,629 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 01:38:00,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:38:00,722 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 01:38:00,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607783049] [2020-07-21 01:38:00,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:38:00,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 01:38:00,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028799076] [2020-07-21 01:38:00,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 01:38:00,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:00,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 01:38:00,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:38:00,728 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 8 states. [2020-07-21 01:38:00,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:00,805 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2020-07-21 01:38:00,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:38:00,806 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 01:38:00,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:00,808 INFO L225 Difference]: With dead ends: 55 [2020-07-21 01:38:00,808 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 01:38:00,810 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 01:38:00,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 01:38:00,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 01:38:00,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 01:38:00,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 01:38:00,819 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 22 [2020-07-21 01:38:00,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:00,820 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 01:38:00,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 01:38:00,820 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 01:38:00,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 01:38:00,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:00,822 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 01:38:01,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:01,038 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:01,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:01,040 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 2 times [2020-07-21 01:38:01,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:01,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855970899] [2020-07-21 01:38:01,042 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:01,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:38:01,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:01,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 01:38:01,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:01,159 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 01:38:01,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:38:01,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855970899] [2020-07-21 01:38:01,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:38:01,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:38:01,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214491855] [2020-07-21 01:38:01,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:38:01,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:01,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:38:01,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:38:01,173 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 3 states. [2020-07-21 01:38:01,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:01,229 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 01:38:01,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:38:01,230 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 01:38:01,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:01,233 INFO L225 Difference]: With dead ends: 55 [2020-07-21 01:38:01,233 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 01:38:01,234 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 01:38:01,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 01:38:01,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2020-07-21 01:38:01,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 01:38:01,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-07-21 01:38:01,247 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 28 [2020-07-21 01:38:01,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:01,248 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-07-21 01:38:01,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:38:01,248 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-07-21 01:38:01,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:38:01,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:01,250 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 01:38:01,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:01,465 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:01,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:01,466 INFO L82 PathProgramCache]: Analyzing trace with hash 630969145, now seen corresponding path program 1 times [2020-07-21 01:38:01,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:01,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616427] [2020-07-21 01:38:01,468 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:01,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:38:01,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:01,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:38:01,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:01,638 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 01:38:01,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:38:01,806 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 01:38:01,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616427] [2020-07-21 01:38:01,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:38:01,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 01:38:01,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547433555] [2020-07-21 01:38:01,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:38:01,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:01,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:38:01,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:38:01,809 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 14 states. [2020-07-21 01:38:01,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:01,915 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2020-07-21 01:38:01,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:38:01,919 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 01:38:01,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:01,921 INFO L225 Difference]: With dead ends: 69 [2020-07-21 01:38:01,921 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 01:38:01,922 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 01:38:01,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 01:38:01,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 01:38:01,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 01:38:01,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 01:38:01,931 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 31 [2020-07-21 01:38:01,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:01,932 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 01:38:01,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:38:01,932 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 01:38:01,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 01:38:01,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:01,934 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 01:38:02,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:02,150 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:02,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:02,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1614389971, now seen corresponding path program 2 times [2020-07-21 01:38:02,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:02,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126564655] [2020-07-21 01:38:02,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:02,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:38:02,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:02,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:38:02,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:02,479 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 01:38:02,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:38:02,980 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 01:38:02,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126564655] [2020-07-21 01:38:02,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:38:02,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 01:38:02,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388359492] [2020-07-21 01:38:02,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 01:38:02,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:02,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 01:38:02,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-21 01:38:02,984 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 26 states. [2020-07-21 01:38:03,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:03,180 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2020-07-21 01:38:03,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 01:38:03,181 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 43 [2020-07-21 01:38:03,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:03,183 INFO L225 Difference]: With dead ends: 93 [2020-07-21 01:38:03,183 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 01:38:03,184 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 01:38:03,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 01:38:03,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-21 01:38:03,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 01:38:03,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2020-07-21 01:38:03,196 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 43 [2020-07-21 01:38:03,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:03,197 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2020-07-21 01:38:03,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 01:38:03,197 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2020-07-21 01:38:03,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 01:38:03,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:03,200 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 01:38:03,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:03,407 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:03,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:03,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1850308843, now seen corresponding path program 3 times [2020-07-21 01:38:03,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:03,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657940526] [2020-07-21 01:38:03,408 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:04,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:38:04,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:04,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 01:38:04,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:04,583 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 01:38:04,584 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:38:04,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657940526] [2020-07-21 01:38:04,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:38:04,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:38:04,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533615803] [2020-07-21 01:38:04,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:38:04,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:04,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:38:04,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:38:04,586 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 3 states. [2020-07-21 01:38:04,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:04,607 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2020-07-21 01:38:04,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:38:04,607 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 67 [2020-07-21 01:38:04,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:04,612 INFO L225 Difference]: With dead ends: 90 [2020-07-21 01:38:04,612 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 01:38:04,613 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 [2020-07-21 01:38:04,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 01:38:04,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-21 01:38:04,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 01:38:04,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-21 01:38:04,632 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 67 [2020-07-21 01:38:04,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:04,633 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-21 01:38:04,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:38:04,634 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-21 01:38:04,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 01:38:04,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:04,640 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 01:38:04,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:04,842 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:04,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:04,842 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 1 times [2020-07-21 01:38:04,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:04,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620163543] [2020-07-21 01:38:04,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:06,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:38:06,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:38:06,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 01:38:06,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:38:06,647 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 01:38:06,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:38:08,206 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 01:38:08,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620163543] [2020-07-21 01:38:08,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:38:08,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 01:38:08,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899419827] [2020-07-21 01:38:08,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 01:38:08,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:38:08,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 01:38:08,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 01:38:08,210 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-21 01:38:08,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:38:08,550 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-21 01:38:08,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 01:38:08,552 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-21 01:38:08,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:38:08,554 INFO L225 Difference]: With dead ends: 141 [2020-07-21 01:38:08,554 INFO L226 Difference]: Without dead ends: 120 [2020-07-21 01:38:08,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 01:38:08,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-21 01:38:08,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-21 01:38:08,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 01:38:08,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-21 01:38:08,590 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-21 01:38:08,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:38:08,591 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-21 01:38:08,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 01:38:08,591 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-21 01:38:08,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-21 01:38:08,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:38:08,598 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 01:38:08,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:38:08,812 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:38:08,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:38:08,813 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 2 times [2020-07-21 01:38:08,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:38:08,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478122535] [2020-07-21 01:38:08,815 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:39:12,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:39:12,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:39:13,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 01:39:13,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:39:15,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 01:39:15,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:39:15,945 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 01:39:16,152 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 01:39:21,388 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 01:39:21,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478122535] [2020-07-21 01:39:21,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:39:21,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 98 [2020-07-21 01:39:21,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847358020] [2020-07-21 01:39:21,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 01:39:21,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:39:21,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 01:39:21,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4659, Invalid=4847, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 01:39:21,396 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 98 states. [2020-07-21 01:39:22,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:39:22,289 INFO L93 Difference]: Finished difference Result 237 states and 290 transitions. [2020-07-21 01:39:22,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 01:39:22,290 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 115 [2020-07-21 01:39:22,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:39:22,293 INFO L225 Difference]: With dead ends: 237 [2020-07-21 01:39:22,293 INFO L226 Difference]: Without dead ends: 216 [2020-07-21 01:39:22,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4711, Invalid=4991, Unknown=0, NotChecked=0, Total=9702 [2020-07-21 01:39:22,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-21 01:39:22,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-21 01:39:22,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-21 01:39:22,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2020-07-21 01:39:22,319 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 115 [2020-07-21 01:39:22,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:39:22,320 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2020-07-21 01:39:22,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 01:39:22,320 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2020-07-21 01:39:22,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-07-21 01:39:22,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:39:22,324 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 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 01:39:22,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:39:22,526 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:39:22,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:39:22,527 INFO L82 PathProgramCache]: Analyzing trace with hash -946549565, now seen corresponding path program 3 times [2020-07-21 01:39:22,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:39:22,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160109593] [2020-07-21 01:39:22,528 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:34,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:34,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:56,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 01:50:56,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:03,244 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 01:51:03,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:03,820 WARN L193 SmtUtils]: Spent 567.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 01:51:04,398 WARN L193 SmtUtils]: Spent 571.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 01:51:27,613 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 01:51:27,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160109593] [2020-07-21 01:51:27,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:27,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 194 [2020-07-21 01:51:27,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522853026] [2020-07-21 01:51:27,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2020-07-21 01:51:27,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:27,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2020-07-21 01:51:27,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18531, Invalid=18911, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 01:51:27,644 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand 194 states. [2020-07-21 01:51:32,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:32,350 INFO L93 Difference]: Finished difference Result 429 states and 530 transitions. [2020-07-21 01:51:32,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2020-07-21 01:51:32,352 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 211 [2020-07-21 01:51:32,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:32,354 INFO L225 Difference]: With dead ends: 429 [2020-07-21 01:51:32,355 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 01:51:32,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=18631, Invalid=19199, Unknown=0, NotChecked=0, Total=37830 [2020-07-21 01:51:32,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 01:51:32,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2020-07-21 01:51:32,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 01:51:32,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 411 transitions. [2020-07-21 01:51:32,386 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 411 transitions. Word has length 211 [2020-07-21 01:51:32,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:32,387 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 411 transitions. [2020-07-21 01:51:32,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 194 states. [2020-07-21 01:51:32,387 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 411 transitions. [2020-07-21 01:51:32,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-21 01:51:32,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:32,395 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 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 01:51:32,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:32,596 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:32,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:32,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1988117501, now seen corresponding path program 4 times [2020-07-21 01:51:32,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:32,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685711890] [2020-07-21 01:51:32,599 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in