/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_5.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:53:11,933 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:53:11,937 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:53:11,957 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:53:11,958 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:53:11,959 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:53:11,961 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:53:11,962 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:53:11,965 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:53:11,966 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:53:11,968 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:53:11,969 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:53:11,969 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:53:11,970 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:53:11,971 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:53:11,972 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:53:11,974 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:53:11,975 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:53:11,978 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:53:11,981 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:53:11,984 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:53:11,986 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:53:11,987 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:53:11,989 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:53:11,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:53:12,004 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:53:12,005 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:53:12,006 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:53:12,007 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 19:53:12,026 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:53:12,027 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:53:12,028 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:53:12,028 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:53:12,029 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:53:12,029 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:53:12,029 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:53:12,029 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:53:12,030 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:53:12,030 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:53:12,030 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:53:12,030 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:53:12,030 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:53:12,031 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:53:12,031 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:53:12,031 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:53:12,031 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:53:12,031 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:53:12,032 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:53:12,032 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:53:12,032 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:53:12,032 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:53:12,033 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:53:12,033 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:53:12,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:53:12,033 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:53:12,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:12,034 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:53:12,034 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:53:12,034 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:53:12,411 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:53:12,429 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:53:12,435 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:53:12,437 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:53:12,438 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:53:12,439 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_5.c [2020-07-21 19:53:12,547 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f27c49912/3d1da87fbbd6441e8a7d58c70541ab8f/FLAG9aa1bb941 [2020-07-21 19:53:13,230 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:53:13,235 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_5.c [2020-07-21 19:53:13,252 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f27c49912/3d1da87fbbd6441e8a7d58c70541ab8f/FLAG9aa1bb941 [2020-07-21 19:53:13,502 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f27c49912/3d1da87fbbd6441e8a7d58c70541ab8f [2020-07-21 19:53:13,517 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:53:13,522 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:53:13,523 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:13,524 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:53:13,530 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:53:13,531 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,536 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dddd456 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13, skipping insertion in model container [2020-07-21 19:53:13,537 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,546 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:53:13,571 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:53:13,793 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:13,801 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:53:13,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:13,845 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:53:13,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13 WrapperNode [2020-07-21 19:53:13,846 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:13,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:53:13,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:53:13,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:53:13,862 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,863 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,876 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,886 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (1/1) ... [2020-07-21 19:53:13,889 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:53:13,890 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:53:13,890 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:53:13,891 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:53:13,892 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (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 19:53:14,083 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:53:14,083 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:53:14,083 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:53:14,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:53:14,083 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:53:14,083 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:53:14,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:53:14,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:53:14,376 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:53:14,377 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:53:14,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:14 BoogieIcfgContainer [2020-07-21 19:53:14,383 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:53:14,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:53:14,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:53:14,401 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:53:14,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:53:13" (1/3) ... [2020-07-21 19:53:14,402 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f7965d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:14, skipping insertion in model container [2020-07-21 19:53:14,403 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:13" (2/3) ... [2020-07-21 19:53:14,403 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f7965d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:14, skipping insertion in model container [2020-07-21 19:53:14,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:14" (3/3) ... [2020-07-21 19:53:14,410 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_5.c [2020-07-21 19:53:14,434 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:53:14,449 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:53:14,481 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:53:14,521 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:53:14,522 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:53:14,522 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:53:14,522 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:53:14,522 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:53:14,523 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:53:14,523 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:53:14,523 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:53:14,555 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 19:53:14,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 19:53:14,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:14,567 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:14,567 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:14,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:14,579 INFO L82 PathProgramCache]: Analyzing trace with hash 316328318, now seen corresponding path program 1 times [2020-07-21 19:53:14,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:14,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559952911] [2020-07-21 19:53:14,594 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:14,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:14,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:14,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:14,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:14,777 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 19:53:14,777 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:14,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559952911] [2020-07-21 19:53:14,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:14,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:14,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081416263] [2020-07-21 19:53:14,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:14,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:14,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:14,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:14,805 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-07-21 19:53:14,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:14,881 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2020-07-21 19:53:14,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:14,884 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 19:53:14,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:14,902 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:53:14,902 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:53:14,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 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 19:53:14,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:53:14,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2020-07-21 19:53:14,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:53:14,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 49 transitions. [2020-07-21 19:53:14,973 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 49 transitions. Word has length 15 [2020-07-21 19:53:14,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:14,975 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 49 transitions. [2020-07-21 19:53:14,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:14,975 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 49 transitions. [2020-07-21 19:53:14,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 19:53:14,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:14,977 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:15,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,195 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:15,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:15,197 INFO L82 PathProgramCache]: Analyzing trace with hash -493018308, now seen corresponding path program 1 times [2020-07-21 19:53:15,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:15,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830910838] [2020-07-21 19:53:15,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:15,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:15,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:15,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:15,267 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 19:53:15,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:15,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830910838] [2020-07-21 19:53:15,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:15,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:15,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37456801] [2020-07-21 19:53:15,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:15,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:15,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:15,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:15,284 INFO L87 Difference]: Start difference. First operand 30 states and 49 transitions. Second operand 3 states. [2020-07-21 19:53:15,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:15,351 INFO L93 Difference]: Finished difference Result 67 states and 112 transitions. [2020-07-21 19:53:15,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:15,353 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 19:53:15,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:15,356 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:53:15,357 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:53:15,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 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 19:53:15,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:53:15,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-07-21 19:53:15,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:53:15,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 65 transitions. [2020-07-21 19:53:15,385 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 65 transitions. Word has length 15 [2020-07-21 19:53:15,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:15,388 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 65 transitions. [2020-07-21 19:53:15,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:15,388 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 65 transitions. [2020-07-21 19:53:15,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 19:53:15,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:15,392 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:15,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,608 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:15,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:15,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1216458266, now seen corresponding path program 1 times [2020-07-21 19:53:15,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:15,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311690549] [2020-07-21 19:53:15,611 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,659 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:15,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:15,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:15,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:15,682 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 19:53:15,682 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:15,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311690549] [2020-07-21 19:53:15,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:15,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:15,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886299104] [2020-07-21 19:53:15,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:15,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:15,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:15,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:15,688 INFO L87 Difference]: Start difference. First operand 40 states and 65 transitions. Second operand 3 states. [2020-07-21 19:53:15,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:15,713 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 19:53:15,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:15,714 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 19:53:15,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:15,715 INFO L225 Difference]: With dead ends: 63 [2020-07-21 19:53:15,716 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 19:53:15,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 19:53:15,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 19:53:15,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2020-07-21 19:53:15,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 19:53:15,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 67 transitions. [2020-07-21 19:53:15,727 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 67 transitions. Word has length 16 [2020-07-21 19:53:15,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:15,727 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 67 transitions. [2020-07-21 19:53:15,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:15,728 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 67 transitions. [2020-07-21 19:53:15,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 19:53:15,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:15,729 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:15,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,944 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:15,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:15,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1896516636, now seen corresponding path program 1 times [2020-07-21 19:53:15,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:15,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126888157] [2020-07-21 19:53:15,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:15,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:15,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:15,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:15,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:16,010 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 19:53:16,011 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:16,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126888157] [2020-07-21 19:53:16,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:16,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:16,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436686259] [2020-07-21 19:53:16,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:16,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:16,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:16,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:16,014 INFO L87 Difference]: Start difference. First operand 43 states and 67 transitions. Second operand 3 states. [2020-07-21 19:53:16,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:16,042 INFO L93 Difference]: Finished difference Result 76 states and 120 transitions. [2020-07-21 19:53:16,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:16,042 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 19:53:16,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:16,044 INFO L225 Difference]: With dead ends: 76 [2020-07-21 19:53:16,044 INFO L226 Difference]: Without dead ends: 74 [2020-07-21 19:53:16,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 19:53:16,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-21 19:53:16,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2020-07-21 19:53:16,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:53:16,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 88 transitions. [2020-07-21 19:53:16,058 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 88 transitions. Word has length 16 [2020-07-21 19:53:16,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:16,059 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 88 transitions. [2020-07-21 19:53:16,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:16,059 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 88 transitions. [2020-07-21 19:53:16,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 19:53:16,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:16,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:16,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:16,275 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:16,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:16,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1087170010, now seen corresponding path program 1 times [2020-07-21 19:53:16,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:16,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552551170] [2020-07-21 19:53:16,277 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:16,356 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:16,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:16,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:16,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:16,381 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 19:53:16,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:16,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552551170] [2020-07-21 19:53:16,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:16,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:16,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386710618] [2020-07-21 19:53:16,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:16,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:16,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:16,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:16,389 INFO L87 Difference]: Start difference. First operand 56 states and 88 transitions. Second operand 3 states. [2020-07-21 19:53:16,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:16,439 INFO L93 Difference]: Finished difference Result 124 states and 198 transitions. [2020-07-21 19:53:16,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:16,444 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 19:53:16,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:16,445 INFO L225 Difference]: With dead ends: 124 [2020-07-21 19:53:16,446 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 19:53:16,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 19:53:16,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 19:53:16,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2020-07-21 19:53:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-21 19:53:16,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 114 transitions. [2020-07-21 19:53:16,464 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 114 transitions. Word has length 16 [2020-07-21 19:53:16,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:16,465 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 114 transitions. [2020-07-21 19:53:16,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:16,465 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 114 transitions. [2020-07-21 19:53:16,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:53:16,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:16,466 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:16,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:16,668 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:16,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:16,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1337311087, now seen corresponding path program 1 times [2020-07-21 19:53:16,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:16,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756220304] [2020-07-21 19:53:16,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:16,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:16,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:16,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:16,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:16,723 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 19:53:16,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:16,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756220304] [2020-07-21 19:53:16,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:16,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:16,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361569097] [2020-07-21 19:53:16,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:16,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:16,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:16,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:16,727 INFO L87 Difference]: Start difference. First operand 74 states and 114 transitions. Second operand 3 states. [2020-07-21 19:53:16,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:16,763 INFO L93 Difference]: Finished difference Result 130 states and 202 transitions. [2020-07-21 19:53:16,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:16,769 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 19:53:16,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:16,771 INFO L225 Difference]: With dead ends: 130 [2020-07-21 19:53:16,772 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 19:53:16,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 19:53:16,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 19:53:16,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 102. [2020-07-21 19:53:16,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 19:53:16,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 156 transitions. [2020-07-21 19:53:16,784 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 156 transitions. Word has length 17 [2020-07-21 19:53:16,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:16,785 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 156 transitions. [2020-07-21 19:53:16,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:16,785 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 156 transitions. [2020-07-21 19:53:16,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:53:16,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:16,787 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:16,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:16,992 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:16,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:16,993 INFO L82 PathProgramCache]: Analyzing trace with hash -2146657713, now seen corresponding path program 1 times [2020-07-21 19:53:16,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:16,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632993119] [2020-07-21 19:53:16,994 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:17,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:17,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:17,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:17,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:17,058 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 19:53:17,059 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:17,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632993119] [2020-07-21 19:53:17,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:17,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:17,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231641582] [2020-07-21 19:53:17,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:17,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:17,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:17,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:17,062 INFO L87 Difference]: Start difference. First operand 102 states and 156 transitions. Second operand 3 states. [2020-07-21 19:53:17,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:17,085 INFO L93 Difference]: Finished difference Result 152 states and 230 transitions. [2020-07-21 19:53:17,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:17,086 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 19:53:17,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:17,087 INFO L225 Difference]: With dead ends: 152 [2020-07-21 19:53:17,088 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 19:53:17,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 19:53:17,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 19:53:17,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2020-07-21 19:53:17,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 19:53:17,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 154 transitions. [2020-07-21 19:53:17,102 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 154 transitions. Word has length 17 [2020-07-21 19:53:17,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:17,103 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 154 transitions. [2020-07-21 19:53:17,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:17,103 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 154 transitions. [2020-07-21 19:53:17,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:53:17,105 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:17,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:17,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:17,321 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:17,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:17,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1466599343, now seen corresponding path program 1 times [2020-07-21 19:53:17,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:17,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007862109] [2020-07-21 19:53:17,323 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:17,354 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:17,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:17,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:17,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:17,365 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 19:53:17,366 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:17,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007862109] [2020-07-21 19:53:17,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:17,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:17,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816056161] [2020-07-21 19:53:17,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:17,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:17,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:17,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:17,368 INFO L87 Difference]: Start difference. First operand 104 states and 154 transitions. Second operand 3 states. [2020-07-21 19:53:17,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:17,401 INFO L93 Difference]: Finished difference Result 232 states and 344 transitions. [2020-07-21 19:53:17,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:17,403 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 19:53:17,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:17,405 INFO L225 Difference]: With dead ends: 232 [2020-07-21 19:53:17,406 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 19:53:17,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 19:53:17,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 19:53:17,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 19:53:17,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 19:53:17,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 194 transitions. [2020-07-21 19:53:17,425 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 194 transitions. Word has length 17 [2020-07-21 19:53:17,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:17,425 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 194 transitions. [2020-07-21 19:53:17,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:17,425 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 194 transitions. [2020-07-21 19:53:17,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:17,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:17,428 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:17,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:17,637 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:17,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:17,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1100217935, now seen corresponding path program 1 times [2020-07-21 19:53:17,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:17,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1391678178] [2020-07-21 19:53:17,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:53:17,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:17,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:17,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:17,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:17,681 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 19:53:17,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:17,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1391678178] [2020-07-21 19:53:17,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:17,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:17,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526510146] [2020-07-21 19:53:17,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:17,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:17,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:17,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:17,684 INFO L87 Difference]: Start difference. First operand 136 states and 194 transitions. Second operand 3 states. [2020-07-21 19:53:17,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:17,727 INFO L93 Difference]: Finished difference Result 232 states and 332 transitions. [2020-07-21 19:53:17,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:17,728 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:17,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:17,729 INFO L225 Difference]: With dead ends: 232 [2020-07-21 19:53:17,730 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 19:53:17,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 19:53:17,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 19:53:17,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 196. [2020-07-21 19:53:17,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-21 19:53:17,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 274 transitions. [2020-07-21 19:53:17,747 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 274 transitions. Word has length 18 [2020-07-21 19:53:17,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:17,748 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 274 transitions. [2020-07-21 19:53:17,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:17,748 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 274 transitions. [2020-07-21 19:53:17,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:17,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:17,751 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:17,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:17,965 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:17,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:17,966 INFO L82 PathProgramCache]: Analyzing trace with hash 290871309, now seen corresponding path program 1 times [2020-07-21 19:53:17,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:17,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631536178] [2020-07-21 19:53:17,968 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 19:53:18,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:18,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:18,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:18,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:18,020 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 19:53:18,021 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:18,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631536178] [2020-07-21 19:53:18,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:18,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:18,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077486135] [2020-07-21 19:53:18,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:18,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:18,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:18,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:18,023 INFO L87 Difference]: Start difference. First operand 196 states and 274 transitions. Second operand 3 states. [2020-07-21 19:53:18,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:18,049 INFO L93 Difference]: Finished difference Result 292 states and 404 transitions. [2020-07-21 19:53:18,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:18,049 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:18,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:18,051 INFO L225 Difference]: With dead ends: 292 [2020-07-21 19:53:18,052 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 19:53:18,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 19:53:18,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 19:53:18,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-21 19:53:18,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 19:53:18,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 270 transitions. [2020-07-21 19:53:18,066 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 270 transitions. Word has length 18 [2020-07-21 19:53:18,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:18,066 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 270 transitions. [2020-07-21 19:53:18,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:18,067 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 270 transitions. [2020-07-21 19:53:18,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:18,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:18,069 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:18,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,284 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:18,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:18,284 INFO L82 PathProgramCache]: Analyzing trace with hash 970929679, now seen corresponding path program 1 times [2020-07-21 19:53:18,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:18,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56970587] [2020-07-21 19:53:18,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,321 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:18,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:18,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:18,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:18,335 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 19:53:18,336 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:18,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56970587] [2020-07-21 19:53:18,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:18,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:18,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735095614] [2020-07-21 19:53:18,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:18,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:18,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:18,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:18,338 INFO L87 Difference]: Start difference. First operand 200 states and 270 transitions. Second operand 3 states. [2020-07-21 19:53:18,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:18,382 INFO L93 Difference]: Finished difference Result 444 states and 592 transitions. [2020-07-21 19:53:18,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:18,383 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:18,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:18,385 INFO L225 Difference]: With dead ends: 444 [2020-07-21 19:53:18,385 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 19:53:18,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 19:53:18,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 19:53:18,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 19:53:18,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 19:53:18,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 326 transitions. [2020-07-21 19:53:18,403 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 326 transitions. Word has length 18 [2020-07-21 19:53:18,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:18,403 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 326 transitions. [2020-07-21 19:53:18,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:18,404 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 326 transitions. [2020-07-21 19:53:18,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:18,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:18,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:18,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,619 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:18,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:18,619 INFO L82 PathProgramCache]: Analyzing trace with hash -645793370, now seen corresponding path program 1 times [2020-07-21 19:53:18,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:18,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963619797] [2020-07-21 19:53:18,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:18,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:18,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:18,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:18,671 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 19:53:18,672 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:18,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963619797] [2020-07-21 19:53:18,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:18,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:18,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218126646] [2020-07-21 19:53:18,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:18,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:18,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:18,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:18,674 INFO L87 Difference]: Start difference. First operand 256 states and 326 transitions. Second operand 3 states. [2020-07-21 19:53:18,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:18,698 INFO L93 Difference]: Finished difference Result 418 states and 527 transitions. [2020-07-21 19:53:18,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:18,699 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:18,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:18,702 INFO L225 Difference]: With dead ends: 418 [2020-07-21 19:53:18,703 INFO L226 Difference]: Without dead ends: 416 [2020-07-21 19:53:18,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 19:53:18,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2020-07-21 19:53:18,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 384. [2020-07-21 19:53:18,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 19:53:18,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 478 transitions. [2020-07-21 19:53:18,723 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 478 transitions. Word has length 19 [2020-07-21 19:53:18,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:18,724 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 478 transitions. [2020-07-21 19:53:18,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:18,724 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 478 transitions. [2020-07-21 19:53:18,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:18,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:18,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:18,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,941 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:18,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:18,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1455139996, now seen corresponding path program 1 times [2020-07-21 19:53:18,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:18,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186921468] [2020-07-21 19:53:18,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:18,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:18,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:18,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:18,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:18,986 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 19:53:18,987 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:18,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186921468] [2020-07-21 19:53:18,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:18,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:18,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421280396] [2020-07-21 19:53:18,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:18,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:18,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:18,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:18,992 INFO L87 Difference]: Start difference. First operand 384 states and 478 transitions. Second operand 3 states. [2020-07-21 19:53:19,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:19,022 INFO L93 Difference]: Finished difference Result 848 states and 1038 transitions. [2020-07-21 19:53:19,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:19,023 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:19,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:19,025 INFO L225 Difference]: With dead ends: 848 [2020-07-21 19:53:19,025 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:53:19,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 19:53:19,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:53:19,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:53:19,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:53:19,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:53:19,029 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 19 [2020-07-21 19:53:19,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:19,029 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:53:19,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:19,029 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:53:19,030 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:53:19,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:19,245 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:53:19,335 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:53:19,335 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:19,335 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:19,335 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:53:19,336 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:53:19,336 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:53:19,336 INFO L268 CegarLoopResult]: For program point L64(line 64) no Hoare annotation was computed. [2020-07-21 19:53:19,336 INFO L271 CegarLoopResult]: At program point L89(lines 5 93) the Hoare annotation is: true [2020-07-21 19:53:19,336 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 93) no Hoare annotation was computed. [2020-07-21 19:53:19,337 INFO L268 CegarLoopResult]: For program point L73-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,337 INFO L268 CegarLoopResult]: For program point L69(line 69) no Hoare annotation was computed. [2020-07-21 19:53:19,337 INFO L268 CegarLoopResult]: For program point L57-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,337 INFO L268 CegarLoopResult]: For program point L53-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,337 INFO L268 CegarLoopResult]: For program point L49-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,338 INFO L268 CegarLoopResult]: For program point L78-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,338 INFO L268 CegarLoopResult]: For program point L45-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,338 INFO L268 CegarLoopResult]: For program point L74(line 74) no Hoare annotation was computed. [2020-07-21 19:53:19,338 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 19:53:19,339 INFO L268 CegarLoopResult]: For program point L41-2(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,339 INFO L271 CegarLoopResult]: At program point L83-1(lines 24 88) the Hoare annotation is: true [2020-07-21 19:53:19,339 INFO L268 CegarLoopResult]: For program point L79(line 79) no Hoare annotation was computed. [2020-07-21 19:53:19,339 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 93) no Hoare annotation was computed. [2020-07-21 19:53:19,339 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 91) no Hoare annotation was computed. [2020-07-21 19:53:19,340 INFO L268 CegarLoopResult]: For program point L63-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,340 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 93) the Hoare annotation is: true [2020-07-21 19:53:19,340 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 19:53:19,340 INFO L268 CegarLoopResult]: For program point L84(line 84) no Hoare annotation was computed. [2020-07-21 19:53:19,340 INFO L264 CegarLoopResult]: At program point L84-1(lines 5 93) the Hoare annotation is: false [2020-07-21 19:53:19,341 INFO L268 CegarLoopResult]: For program point L68-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 19:53:19,358 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:53:19 BoogieIcfgContainer [2020-07-21 19:53:19,358 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:53:19,362 INFO L168 Benchmark]: Toolchain (without parser) took 5841.45 ms. Allocated memory was 142.6 MB in the beginning and 229.1 MB in the end (delta: 86.5 MB). Free memory was 100.4 MB in the beginning and 101.7 MB in the end (delta: -1.3 MB). Peak memory consumption was 85.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:19,363 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 142.6 MB. Free memory is still 118.4 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:53:19,364 INFO L168 Benchmark]: CACSL2BoogieTranslator took 323.46 ms. Allocated memory is still 142.6 MB. Free memory was 100.0 MB in the beginning and 89.8 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:19,365 INFO L168 Benchmark]: Boogie Preprocessor took 42.18 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 88.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:19,366 INFO L168 Benchmark]: RCFGBuilder took 493.03 ms. Allocated memory was 142.6 MB in the beginning and 200.8 MB in the end (delta: 58.2 MB). Free memory was 88.5 MB in the beginning and 164.9 MB in the end (delta: -76.4 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:19,367 INFO L168 Benchmark]: TraceAbstraction took 4971.52 ms. Allocated memory was 200.8 MB in the beginning and 229.1 MB in the end (delta: 28.3 MB). Free memory was 164.9 MB in the beginning and 101.7 MB in the end (delta: 63.2 MB). Peak memory consumption was 91.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:19,371 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 142.6 MB. Free memory is still 118.4 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 323.46 ms. Allocated memory is still 142.6 MB. Free memory was 100.0 MB in the beginning and 89.8 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 42.18 ms. Allocated memory is still 142.6 MB. Free memory was 89.8 MB in the beginning and 88.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 493.03 ms. Allocated memory was 142.6 MB in the beginning and 200.8 MB in the end (delta: 58.2 MB). Free memory was 88.5 MB in the beginning and 164.9 MB in the end (delta: -76.4 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4971.52 ms. Allocated memory was 200.8 MB in the beginning and 229.1 MB in the end (delta: 28.3 MB). Free memory was 164.9 MB in the beginning and 101.7 MB in the end (delta: 63.2 MB). Peak memory consumption was 91.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 91]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.7s, OverallIterations: 13, TraceHistogramMax: 1, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 608 SDtfs, 263 SDslu, 400 SDs, 0 SdLazy, 70 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 208 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=384occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 13 MinimizatonAttempts, 136 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 42 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 221 NumberOfCodeBlocks, 186 NumberOfCodeBlocksAsserted, 22 NumberOfCheckSat, 208 ConstructedInterpolants, 0 QuantifiedInterpolants, 5830 SizeOfPredicates, 0 NumberOfNonLiveVariables, 779 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 13 InterpolantComputations, 13 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...