/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:50:16,918 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:50:16,922 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:50:16,940 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:50:16,940 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:50:16,941 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:50:16,943 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:50:16,945 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:50:16,947 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:50:16,948 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:50:16,949 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:50:16,950 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:50:16,951 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:50:16,952 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:50:16,953 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:50:16,954 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:50:16,955 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:50:16,956 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:50:16,958 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:50:16,961 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:50:16,963 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:50:16,964 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:50:16,966 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:50:16,967 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:50:16,970 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:50:16,979 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:50:16,980 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:50:16,981 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:50:16,982 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:50:17,000 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:50:17,001 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:50:17,002 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:50:17,003 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:50:17,003 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:50:17,003 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:50:17,003 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:50:17,003 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:50:17,004 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:50:17,004 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:50:17,004 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:50:17,004 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:50:17,004 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:50:17,005 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:50:17,005 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:50:17,005 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:50:17,005 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:50:17,006 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:50:17,006 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:50:17,006 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:50:17,006 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:50:17,006 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:17,007 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:50:17,007 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:50:17,007 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:50:17,007 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:50:17,008 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:17,008 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:50:17,008 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:50:17,008 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:50:17,339 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:50:17,366 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:50:17,371 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:50:17,376 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:50:17,377 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:50:17,378 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-20 13:50:17,483 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/198af8744/7e5e440267334327a17d431030b1def4/FLAG78f8462f2 [2020-07-20 13:50:18,073 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:50:18,074 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-20 13:50:18,083 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/198af8744/7e5e440267334327a17d431030b1def4/FLAG78f8462f2 [2020-07-20 13:50:18,405 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/198af8744/7e5e440267334327a17d431030b1def4 [2020-07-20 13:50:18,417 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:50:18,422 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:50:18,423 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:18,424 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:50:18,428 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:50:18,430 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,433 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3be3771a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18, skipping insertion in model container [2020-07-20 13:50:18,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,444 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:50:18,469 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:50:18,679 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:18,690 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:50:18,719 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:50:18,737 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:50:18,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18 WrapperNode [2020-07-20 13:50:18,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:50:18,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:50:18,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:50:18,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:50:18,757 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,757 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,876 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,877 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,885 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,900 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,904 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... [2020-07-20 13:50:18,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:50:18,913 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:50:18,914 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:50:18,914 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:50:18,915 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:50:18,991 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:50:18,991 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:50:18,991 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:50:18,991 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:50:18,992 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:50:18,992 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:50:18,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:50:18,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:50:19,329 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:50:19,330 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 13:50:19,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:19 BoogieIcfgContainer [2020-07-20 13:50:19,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:50:19,339 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:50:19,339 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:50:19,344 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:50:19,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:50:18" (1/3) ... [2020-07-20 13:50:19,345 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5adc46b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:19, skipping insertion in model container [2020-07-20 13:50:19,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:50:18" (2/3) ... [2020-07-20 13:50:19,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5adc46b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:50:19, skipping insertion in model container [2020-07-20 13:50:19,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:50:19" (3/3) ... [2020-07-20 13:50:19,349 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-20 13:50:19,367 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:50:19,378 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:50:19,402 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:50:19,449 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:50:19,449 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:50:19,450 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:50:19,454 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:50:19,454 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:50:19,455 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:50:19,455 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:50:19,455 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:50:19,512 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-20 13:50:19,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:50:19,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,528 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:19,529 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:19,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:19,541 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-20 13:50:19,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:19,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673746621] [2020-07-20 13:50:19,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:19,658 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:19,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:19,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:19,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:19,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:19,718 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:19,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673746621] [2020-07-20 13:50:19,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:19,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:19,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418759563] [2020-07-20 13:50:19,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:19,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:19,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:19,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:19,753 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-20 13:50:19,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:19,848 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-20 13:50:19,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:19,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:50:19,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:19,866 INFO L225 Difference]: With dead ends: 75 [2020-07-20 13:50:19,867 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:50:19,872 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 [2020-07-20 13:50:19,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:50:19,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-20 13:50:19,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 13:50:19,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-20 13:50:19,929 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-20 13:50:19,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:19,930 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-20 13:50:19,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:19,930 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-20 13:50:19,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:50:19,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:19,932 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,147 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,148 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-20 13:50:20,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824320706] [2020-07-20 13:50:20,149 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:20,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,268 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824320706] [2020-07-20 13:50:20,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162159642] [2020-07-20 13:50:20,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,273 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-20 13:50:20,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,319 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-20 13:50:20,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,320 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:50:20,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,323 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:50:20,323 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:50:20,324 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 [2020-07-20 13:50:20,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:50:20,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-20 13:50:20,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 13:50:20,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-20 13:50:20,337 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-20 13:50:20,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,337 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-20 13:50:20,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,338 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-20 13:50:20,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:20,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,339 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,554 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,555 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-20 13:50:20,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748034555] [2020-07-20 13:50:20,557 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:20,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,622 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,622 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748034555] [2020-07-20 13:50:20,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845046967] [2020-07-20 13:50:20,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,626 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-20 13:50:20,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:20,649 INFO L93 Difference]: Finished difference Result 109 states and 191 transitions. [2020-07-20 13:50:20,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:20,650 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:20,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:20,653 INFO L225 Difference]: With dead ends: 109 [2020-07-20 13:50:20,653 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 13:50:20,654 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 [2020-07-20 13:50:20,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 13:50:20,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 77. [2020-07-20 13:50:20,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 13:50:20,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 135 transitions. [2020-07-20 13:50:20,668 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 135 transitions. Word has length 19 [2020-07-20 13:50:20,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:20,668 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 135 transitions. [2020-07-20 13:50:20,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:20,669 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 135 transitions. [2020-07-20 13:50:20,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:20,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:20,670 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:20,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,886 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:20,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:20,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1422098805, now seen corresponding path program 1 times [2020-07-20 13:50:20,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:20,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181899086] [2020-07-20 13:50:20,888 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:20,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:20,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:20,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:20,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:20,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:20,959 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:20,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181899086] [2020-07-20 13:50:20,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:20,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:20,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380610323] [2020-07-20 13:50:20,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:20,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:20,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:20,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:20,963 INFO L87 Difference]: Start difference. First operand 77 states and 135 transitions. Second operand 3 states. [2020-07-20 13:50:21,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,004 INFO L93 Difference]: Finished difference Result 118 states and 203 transitions. [2020-07-20 13:50:21,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,007 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:21,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,009 INFO L225 Difference]: With dead ends: 118 [2020-07-20 13:50:21,009 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:50:21,010 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 [2020-07-20 13:50:21,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:50:21,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2020-07-20 13:50:21,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 13:50:21,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-20 13:50:21,024 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-20 13:50:21,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,025 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-20 13:50:21,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,025 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-20 13:50:21,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:50:21,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,026 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,234 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-20 13:50:21,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635017419] [2020-07-20 13:50:21,236 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:21,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,303 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,304 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635017419] [2020-07-20 13:50:21,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634867241] [2020-07-20 13:50:21,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,325 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-20 13:50:21,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,379 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-20 13:50:21,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,380 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 13:50:21,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,383 INFO L225 Difference]: With dead ends: 184 [2020-07-20 13:50:21,383 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 13:50:21,388 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 [2020-07-20 13:50:21,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 13:50:21,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-20 13:50:21,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 13:50:21,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-20 13:50:21,416 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-20 13:50:21,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,417 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-20 13:50:21,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,417 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-20 13:50:21,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:21,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,421 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,639 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,640 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-20 13:50:21,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246958014] [2020-07-20 13:50:21,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:21,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:21,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:21,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:21,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:21,693 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:21,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246958014] [2020-07-20 13:50:21,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:21,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:21,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048223908] [2020-07-20 13:50:21,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:21,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:21,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:21,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,696 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-20 13:50:21,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:21,727 INFO L93 Difference]: Finished difference Result 202 states and 346 transitions. [2020-07-20 13:50:21,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:21,727 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:21,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:21,733 INFO L225 Difference]: With dead ends: 202 [2020-07-20 13:50:21,733 INFO L226 Difference]: Without dead ends: 200 [2020-07-20 13:50:21,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:21,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2020-07-20 13:50:21,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 150. [2020-07-20 13:50:21,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 13:50:21,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 252 transitions. [2020-07-20 13:50:21,771 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 252 transitions. Word has length 20 [2020-07-20 13:50:21,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:21,772 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 252 transitions. [2020-07-20 13:50:21,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:21,772 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 252 transitions. [2020-07-20 13:50:21,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:21,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:21,776 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:21,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:21,978 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:21,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:21,978 INFO L82 PathProgramCache]: Analyzing trace with hash 991697490, now seen corresponding path program 1 times [2020-07-20 13:50:21,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:21,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682747528] [2020-07-20 13:50:21,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:22,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682747528] [2020-07-20 13:50:22,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595149439] [2020-07-20 13:50:22,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,037 INFO L87 Difference]: Start difference. First operand 150 states and 252 transitions. Second operand 3 states. [2020-07-20 13:50:22,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,057 INFO L93 Difference]: Finished difference Result 224 states and 374 transitions. [2020-07-20 13:50:22,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,060 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:22,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,062 INFO L225 Difference]: With dead ends: 224 [2020-07-20 13:50:22,062 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 13:50:22,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 13:50:22,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 152. [2020-07-20 13:50:22,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 13:50:22,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-20 13:50:22,076 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-20 13:50:22,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,077 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-20 13:50:22,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,077 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-20 13:50:22,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:50:22,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,078 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,292 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-20 13:50:22,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317378452] [2020-07-20 13:50:22,294 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,342 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:50:22,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,360 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317378452] [2020-07-20 13:50:22,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763342593] [2020-07-20 13:50:22,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,363 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-20 13:50:22,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,383 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-20 13:50:22,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,384 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 13:50:22,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,386 INFO L225 Difference]: With dead ends: 352 [2020-07-20 13:50:22,386 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 13:50:22,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 13:50:22,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-20 13:50:22,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 13:50:22,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-20 13:50:22,403 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-20 13:50:22,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,404 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-20 13:50:22,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,404 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-20 13:50:22,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:22,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,621 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,622 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-20 13:50:22,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880997193] [2020-07-20 13:50:22,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,656 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:22,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:22,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:22,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:22,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880997193] [2020-07-20 13:50:22,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:22,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:22,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42683530] [2020-07-20 13:50:22,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:22,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:22,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:22,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,674 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-20 13:50:22,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:22,701 INFO L93 Difference]: Finished difference Result 376 states and 620 transitions. [2020-07-20 13:50:22,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:22,701 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:22,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:22,705 INFO L225 Difference]: With dead ends: 376 [2020-07-20 13:50:22,705 INFO L226 Difference]: Without dead ends: 374 [2020-07-20 13:50:22,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:22,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2020-07-20 13:50:22,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 292. [2020-07-20 13:50:22,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-20 13:50:22,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 466 transitions. [2020-07-20 13:50:22,723 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 466 transitions. Word has length 21 [2020-07-20 13:50:22,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:22,724 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 466 transitions. [2020-07-20 13:50:22,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:22,724 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 466 transitions. [2020-07-20 13:50:22,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 13:50:22,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:22,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:22,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,942 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:22,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:22,943 INFO L82 PathProgramCache]: Analyzing trace with hash 534158954, now seen corresponding path program 1 times [2020-07-20 13:50:22,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:22,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710133887] [2020-07-20 13:50:22,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:22,982 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:22,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:22,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:22,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,005 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710133887] [2020-07-20 13:50:23,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497388834] [2020-07-20 13:50:23,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,012 INFO L87 Difference]: Start difference. First operand 292 states and 466 transitions. Second operand 3 states. [2020-07-20 13:50:23,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,067 INFO L93 Difference]: Finished difference Result 680 states and 1092 transitions. [2020-07-20 13:50:23,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,068 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 13:50:23,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,072 INFO L225 Difference]: With dead ends: 680 [2020-07-20 13:50:23,072 INFO L226 Difference]: Without dead ends: 398 [2020-07-20 13:50:23,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2020-07-20 13:50:23,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 396. [2020-07-20 13:50:23,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-20 13:50:23,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 622 transitions. [2020-07-20 13:50:23,110 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 622 transitions. Word has length 21 [2020-07-20 13:50:23,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,110 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 622 transitions. [2020-07-20 13:50:23,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,111 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 622 transitions. [2020-07-20 13:50:23,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:23,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,114 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,328 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,329 INFO L82 PathProgramCache]: Analyzing trace with hash -878891997, now seen corresponding path program 1 times [2020-07-20 13:50:23,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037304699] [2020-07-20 13:50:23,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:23,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:23,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,427 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037304699] [2020-07-20 13:50:23,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082376020] [2020-07-20 13:50:23,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,429 INFO L87 Difference]: Start difference. First operand 396 states and 622 transitions. Second operand 3 states. [2020-07-20 13:50:23,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,458 INFO L93 Difference]: Finished difference Result 704 states and 1120 transitions. [2020-07-20 13:50:23,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,459 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:23,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,464 INFO L225 Difference]: With dead ends: 704 [2020-07-20 13:50:23,465 INFO L226 Difference]: Without dead ends: 702 [2020-07-20 13:50:23,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2020-07-20 13:50:23,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 572. [2020-07-20 13:50:23,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 572 states. [2020-07-20 13:50:23,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 572 states to 572 states and 878 transitions. [2020-07-20 13:50:23,499 INFO L78 Accepts]: Start accepts. Automaton has 572 states and 878 transitions. Word has length 22 [2020-07-20 13:50:23,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,500 INFO L479 AbstractCegarLoop]: Abstraction has 572 states and 878 transitions. [2020-07-20 13:50:23,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,500 INFO L276 IsEmpty]: Start isEmpty. Operand 572 states and 878 transitions. [2020-07-20 13:50:23,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:50:23,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,503 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:23,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:23,718 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:23,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:23,718 INFO L82 PathProgramCache]: Analyzing trace with hash -177827419, now seen corresponding path program 1 times [2020-07-20 13:50:23,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:23,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434869272] [2020-07-20 13:50:23,720 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:23,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:23,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:23,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:23,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:23,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:23,769 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:23,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434869272] [2020-07-20 13:50:23,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:23,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:23,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901894394] [2020-07-20 13:50:23,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:23,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:23,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:23,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,772 INFO L87 Difference]: Start difference. First operand 572 states and 878 transitions. Second operand 3 states. [2020-07-20 13:50:23,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:23,809 INFO L93 Difference]: Finished difference Result 1328 states and 2048 transitions. [2020-07-20 13:50:23,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:23,809 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 13:50:23,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:23,815 INFO L225 Difference]: With dead ends: 1328 [2020-07-20 13:50:23,816 INFO L226 Difference]: Without dead ends: 766 [2020-07-20 13:50:23,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:23,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2020-07-20 13:50:23,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 764. [2020-07-20 13:50:23,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 764 states. [2020-07-20 13:50:23,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1150 transitions. [2020-07-20 13:50:23,857 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1150 transitions. Word has length 22 [2020-07-20 13:50:23,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:23,857 INFO L479 AbstractCegarLoop]: Abstraction has 764 states and 1150 transitions. [2020-07-20 13:50:23,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:23,858 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1150 transitions. [2020-07-20 13:50:23,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:23,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:23,860 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:24,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,075 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:24,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:24,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1475632739, now seen corresponding path program 1 times [2020-07-20 13:50:24,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:24,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380086696] [2020-07-20 13:50:24,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:50:24,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:24,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:24,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:24,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380086696] [2020-07-20 13:50:24,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832499013] [2020-07-20 13:50:24,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,156 INFO L87 Difference]: Start difference. First operand 764 states and 1150 transitions. Second operand 3 states. [2020-07-20 13:50:24,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:24,191 INFO L93 Difference]: Finished difference Result 1328 states and 2016 transitions. [2020-07-20 13:50:24,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:24,192 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:24,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:24,200 INFO L225 Difference]: With dead ends: 1328 [2020-07-20 13:50:24,201 INFO L226 Difference]: Without dead ends: 1326 [2020-07-20 13:50:24,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1326 states. [2020-07-20 13:50:24,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1326 to 1132. [2020-07-20 13:50:24,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1132 states. [2020-07-20 13:50:24,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1662 transitions. [2020-07-20 13:50:24,250 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1662 transitions. Word has length 23 [2020-07-20 13:50:24,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:24,250 INFO L479 AbstractCegarLoop]: Abstraction has 1132 states and 1662 transitions. [2020-07-20 13:50:24,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:24,251 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1662 transitions. [2020-07-20 13:50:24,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 13:50:24,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:24,254 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:24,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,468 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:24,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:24,469 INFO L82 PathProgramCache]: Analyzing trace with hash -774568161, now seen corresponding path program 1 times [2020-07-20 13:50:24,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:24,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108983402] [2020-07-20 13:50:24,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:24,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:24,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:24,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108983402] [2020-07-20 13:50:24,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911464597] [2020-07-20 13:50:24,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,523 INFO L87 Difference]: Start difference. First operand 1132 states and 1662 transitions. Second operand 3 states. [2020-07-20 13:50:24,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:24,577 INFO L93 Difference]: Finished difference Result 2608 states and 3840 transitions. [2020-07-20 13:50:24,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:24,579 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 13:50:24,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:24,590 INFO L225 Difference]: With dead ends: 2608 [2020-07-20 13:50:24,590 INFO L226 Difference]: Without dead ends: 1486 [2020-07-20 13:50:24,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1486 states. [2020-07-20 13:50:24,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1486 to 1484. [2020-07-20 13:50:24,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1484 states. [2020-07-20 13:50:24,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1484 states to 1484 states and 2126 transitions. [2020-07-20 13:50:24,663 INFO L78 Accepts]: Start accepts. Automaton has 1484 states and 2126 transitions. Word has length 23 [2020-07-20 13:50:24,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:24,663 INFO L479 AbstractCegarLoop]: Abstraction has 1484 states and 2126 transitions. [2020-07-20 13:50:24,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:24,664 INFO L276 IsEmpty]: Start isEmpty. Operand 1484 states and 2126 transitions. [2020-07-20 13:50:24,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:24,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:24,667 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:24,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,883 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:24,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:24,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1500241080, now seen corresponding path program 1 times [2020-07-20 13:50:24,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:24,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83770182] [2020-07-20 13:50:24,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:24,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:24,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:24,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:24,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:24,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:24,965 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:24,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83770182] [2020-07-20 13:50:24,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:24,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:24,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464511316] [2020-07-20 13:50:24,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:24,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:24,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:24,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:24,968 INFO L87 Difference]: Start difference. First operand 1484 states and 2126 transitions. Second operand 3 states. [2020-07-20 13:50:25,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,054 INFO L93 Difference]: Finished difference Result 2512 states and 3600 transitions. [2020-07-20 13:50:25,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,055 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:25,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,074 INFO L225 Difference]: With dead ends: 2512 [2020-07-20 13:50:25,075 INFO L226 Difference]: Without dead ends: 2510 [2020-07-20 13:50:25,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2510 states. [2020-07-20 13:50:25,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2510 to 2252. [2020-07-20 13:50:25,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2252 states. [2020-07-20 13:50:25,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2252 states to 2252 states and 3150 transitions. [2020-07-20 13:50:25,211 INFO L78 Accepts]: Start accepts. Automaton has 2252 states and 3150 transitions. Word has length 24 [2020-07-20 13:50:25,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:25,212 INFO L479 AbstractCegarLoop]: Abstraction has 2252 states and 3150 transitions. [2020-07-20 13:50:25,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:25,213 INFO L276 IsEmpty]: Start isEmpty. Operand 2252 states and 3150 transitions. [2020-07-20 13:50:25,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 13:50:25,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:25,220 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:25,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,434 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:25,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:25,435 INFO L82 PathProgramCache]: Analyzing trace with hash -2093661638, now seen corresponding path program 1 times [2020-07-20 13:50:25,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:25,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208986521] [2020-07-20 13:50:25,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:25,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:25,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:25,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:25,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:25,513 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:25,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:25,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208986521] [2020-07-20 13:50:25,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:25,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:25,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738657986] [2020-07-20 13:50:25,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:25,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:25,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:25,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,521 INFO L87 Difference]: Start difference. First operand 2252 states and 3150 transitions. Second operand 3 states. [2020-07-20 13:50:25,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:25,662 INFO L93 Difference]: Finished difference Result 5136 states and 7184 transitions. [2020-07-20 13:50:25,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:25,663 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 13:50:25,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:25,682 INFO L225 Difference]: With dead ends: 5136 [2020-07-20 13:50:25,682 INFO L226 Difference]: Without dead ends: 2894 [2020-07-20 13:50:25,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:25,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2894 states. [2020-07-20 13:50:25,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2894 to 2892. [2020-07-20 13:50:25,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2892 states. [2020-07-20 13:50:25,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2892 states to 2892 states and 3918 transitions. [2020-07-20 13:50:25,812 INFO L78 Accepts]: Start accepts. Automaton has 2892 states and 3918 transitions. Word has length 24 [2020-07-20 13:50:25,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:25,813 INFO L479 AbstractCegarLoop]: Abstraction has 2892 states and 3918 transitions. [2020-07-20 13:50:25,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:25,813 INFO L276 IsEmpty]: Start isEmpty. Operand 2892 states and 3918 transitions. [2020-07-20 13:50:25,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:25,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:25,819 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:26,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,034 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:26,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:26,035 INFO L82 PathProgramCache]: Analyzing trace with hash -736950702, now seen corresponding path program 1 times [2020-07-20 13:50:26,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:26,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521265265] [2020-07-20 13:50:26,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:26,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:26,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:26,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:26,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:26,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:26,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521265265] [2020-07-20 13:50:26,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:26,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:26,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194771952] [2020-07-20 13:50:26,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:26,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:26,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:26,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,085 INFO L87 Difference]: Start difference. First operand 2892 states and 3918 transitions. Second operand 3 states. [2020-07-20 13:50:26,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:26,165 INFO L93 Difference]: Finished difference Result 4308 states and 5784 transitions. [2020-07-20 13:50:26,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:26,165 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:26,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:26,184 INFO L225 Difference]: With dead ends: 4308 [2020-07-20 13:50:26,185 INFO L226 Difference]: Without dead ends: 2898 [2020-07-20 13:50:26,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2898 states. [2020-07-20 13:50:26,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2898 to 2896. [2020-07-20 13:50:26,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2896 states. [2020-07-20 13:50:26,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2896 states to 2896 states and 3798 transitions. [2020-07-20 13:50:26,320 INFO L78 Accepts]: Start accepts. Automaton has 2896 states and 3798 transitions. Word has length 25 [2020-07-20 13:50:26,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,321 INFO L479 AbstractCegarLoop]: Abstraction has 2896 states and 3798 transitions. [2020-07-20 13:50:26,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,321 INFO L276 IsEmpty]: Start isEmpty. Operand 2896 states and 3798 transitions. [2020-07-20 13:50:26,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:26,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:26,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,542 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:26,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:26,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1758019056, now seen corresponding path program 1 times [2020-07-20 13:50:26,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:26,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279970091] [2020-07-20 13:50:26,546 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:26,596 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:26,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:26,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:26,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:26,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:26,610 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:26,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279970091] [2020-07-20 13:50:26,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:26,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:26,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653680052] [2020-07-20 13:50:26,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:26,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:26,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:26,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,618 INFO L87 Difference]: Start difference. First operand 2896 states and 3798 transitions. Second operand 3 states. [2020-07-20 13:50:26,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:26,688 INFO L93 Difference]: Finished difference Result 4316 states and 5608 transitions. [2020-07-20 13:50:26,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:26,689 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:26,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:26,707 INFO L225 Difference]: With dead ends: 4316 [2020-07-20 13:50:26,708 INFO L226 Difference]: Without dead ends: 2906 [2020-07-20 13:50:26,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:26,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2906 states. [2020-07-20 13:50:26,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2906 to 2904. [2020-07-20 13:50:26,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2904 states. [2020-07-20 13:50:26,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 3686 transitions. [2020-07-20 13:50:26,880 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 3686 transitions. Word has length 25 [2020-07-20 13:50:26,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:26,881 INFO L479 AbstractCegarLoop]: Abstraction has 2904 states and 3686 transitions. [2020-07-20 13:50:26,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:26,881 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 3686 transitions. [2020-07-20 13:50:26,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:26,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:26,887 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:27,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,103 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:27,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:27,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1257084562, now seen corresponding path program 1 times [2020-07-20 13:50:27,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:27,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862566654] [2020-07-20 13:50:27,104 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:50:27,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:27,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:27,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:27,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:27,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:27,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862566654] [2020-07-20 13:50:27,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:27,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:27,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799831830] [2020-07-20 13:50:27,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:27,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:27,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:27,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,160 INFO L87 Difference]: Start difference. First operand 2904 states and 3686 transitions. Second operand 3 states. [2020-07-20 13:50:27,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:27,284 INFO L93 Difference]: Finished difference Result 8538 states and 10727 transitions. [2020-07-20 13:50:27,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:27,285 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:27,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:27,301 INFO L225 Difference]: With dead ends: 8538 [2020-07-20 13:50:27,302 INFO L226 Difference]: Without dead ends: 2904 [2020-07-20 13:50:27,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2904 states. [2020-07-20 13:50:27,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2904 to 2904. [2020-07-20 13:50:27,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2904 states. [2020-07-20 13:50:27,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 3430 transitions. [2020-07-20 13:50:27,415 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 3430 transitions. Word has length 25 [2020-07-20 13:50:27,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:27,415 INFO L479 AbstractCegarLoop]: Abstraction has 2904 states and 3430 transitions. [2020-07-20 13:50:27,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:27,415 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 3430 transitions. [2020-07-20 13:50:27,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:50:27,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:50:27,421 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:50:27,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,635 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:50:27,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:50:27,636 INFO L82 PathProgramCache]: Analyzing trace with hash 556019984, now seen corresponding path program 1 times [2020-07-20 13:50:27,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:50:27,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117319058] [2020-07-20 13:50:27,636 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:50:27,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:50:27,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:50:27,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:50:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:50:27,698 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:50:27,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117319058] [2020-07-20 13:50:27,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:50:27,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:50:27,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396367440] [2020-07-20 13:50:27,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:50:27,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:50:27,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:50:27,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,701 INFO L87 Difference]: Start difference. First operand 2904 states and 3430 transitions. Second operand 3 states. [2020-07-20 13:50:27,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:50:27,752 INFO L93 Difference]: Finished difference Result 2904 states and 3430 transitions. [2020-07-20 13:50:27,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:50:27,753 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 13:50:27,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:50:27,754 INFO L225 Difference]: With dead ends: 2904 [2020-07-20 13:50:27,754 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:50:27,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:50:27,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:50:27,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:50:27,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:50:27,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:50:27,764 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-20 13:50:27,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:50:27,765 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:50:27,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:50:27,765 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:50:27,765 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:50:27,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:50:27,983 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:50:28,058 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,059 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,059 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,059 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,059 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 13:50:28,059 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 13:50:28,059 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-20 13:50:28,059 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-20 13:50:28,060 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-20 13:50:28,061 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-20 13:50:28,061 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-20 13:50:28,061 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-20 13:50:28,061 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,061 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,062 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-20 13:50:28,063 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-20 13:50:28,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:50:28 BoogieIcfgContainer [2020-07-20 13:50:28,078 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:50:28,082 INFO L168 Benchmark]: Toolchain (without parser) took 9661.26 ms. Allocated memory was 144.7 MB in the beginning and 291.0 MB in the end (delta: 146.3 MB). Free memory was 101.7 MB in the beginning and 121.9 MB in the end (delta: -20.2 MB). Peak memory consumption was 126.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,083 INFO L168 Benchmark]: CDTParser took 0.91 ms. Allocated memory is still 144.7 MB. Free memory is still 119.2 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 13:50:28,083 INFO L168 Benchmark]: CACSL2BoogieTranslator took 314.97 ms. Allocated memory is still 144.7 MB. Free memory was 101.3 MB in the beginning and 90.8 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,084 INFO L168 Benchmark]: Boogie Preprocessor took 168.82 ms. Allocated memory was 144.7 MB in the beginning and 202.9 MB in the end (delta: 58.2 MB). Free memory was 90.8 MB in the beginning and 181.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,084 INFO L168 Benchmark]: RCFGBuilder took 424.14 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 163.2 MB in the end (delta: 18.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,085 INFO L168 Benchmark]: TraceAbstraction took 8739.51 ms. Allocated memory was 202.9 MB in the beginning and 291.0 MB in the end (delta: 88.1 MB). Free memory was 163.2 MB in the beginning and 121.9 MB in the end (delta: 41.3 MB). Peak memory consumption was 129.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:50:28,087 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.91 ms. Allocated memory is still 144.7 MB. Free memory is still 119.2 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 314.97 ms. Allocated memory is still 144.7 MB. Free memory was 101.3 MB in the beginning and 90.8 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 168.82 ms. Allocated memory was 144.7 MB in the beginning and 202.9 MB in the end (delta: 58.2 MB). Free memory was 90.8 MB in the beginning and 181.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 424.14 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 163.2 MB in the end (delta: 18.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8739.51 ms. Allocated memory was 202.9 MB in the beginning and 291.0 MB in the end (delta: 88.1 MB). Free memory was 163.2 MB in the beginning and 121.9 MB in the end (delta: 41.3 MB). Peak memory consumption was 129.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: 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: 33]: 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, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.5s, OverallIterations: 20, TraceHistogramMax: 1, AutomataDifference: 1.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1349 SDtfs, 643 SDslu, 917 SDs, 0 SdLazy, 106 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 413 GetRequests, 393 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2904occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.0s AutomataMinimizationTime, 20 MinimizatonAttempts, 784 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 433 NumberOfCodeBlocks, 338 NumberOfCodeBlocksAsserted, 60 NumberOfCheckSat, 413 ConstructedInterpolants, 0 QuantifiedInterpolants, 16261 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1707 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 20 InterpolantComputations, 20 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...