/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_9.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:22:52,551 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:22:52,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:22:52,570 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:22:52,571 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:22:52,572 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:22:52,573 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:22:52,575 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:22:52,577 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:22:52,578 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:22:52,579 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:22:52,580 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:22:52,580 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:22:52,581 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:22:52,582 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:22:52,584 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:22:52,584 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:22:52,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:22:52,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:22:52,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:22:52,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:22:52,592 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:22:52,593 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:22:52,594 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:22:52,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:22:52,604 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:22:52,604 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:22:52,605 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:22:52,606 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 11:22:52,625 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:22:52,626 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:22:52,627 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:22:52,627 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:22:52,628 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:22:52,628 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:22:52,628 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:22:52,628 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:22:52,628 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:22:52,629 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:22:52,629 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:22:52,629 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:22:52,629 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:22:52,629 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:22:52,630 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:22:52,630 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:22:52,630 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:22:52,630 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:22:52,630 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:22:52,631 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:22:52,631 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:22:52,631 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:22:52,631 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:22:52,631 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:22:52,632 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:22:52,632 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:22:52,632 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:52,632 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:22:52,632 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:22:52,633 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 -> NOT_INCREMENTALLY [2020-07-20 11:22:52,944 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:22:52,959 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:22:52,963 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:22:52,964 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:22:52,965 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:22:52,966 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 11:22:53,053 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/864e6f543/9d66eaf9dd924feeb2c900fb7104c796/FLAG5d635ef27 [2020-07-20 11:22:53,606 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:22:53,608 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_9.c [2020-07-20 11:22:53,616 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/864e6f543/9d66eaf9dd924feeb2c900fb7104c796/FLAG5d635ef27 [2020-07-20 11:22:53,907 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/864e6f543/9d66eaf9dd924feeb2c900fb7104c796 [2020-07-20 11:22:53,917 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:22:53,921 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:22:53,922 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:22:53,923 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:22:53,926 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:22:53,928 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:22:53" (1/1) ... [2020-07-20 11:22:53,931 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c24edc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:53, skipping insertion in model container [2020-07-20 11:22:53,931 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:22:53" (1/1) ... [2020-07-20 11:22:53,940 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:22:53,963 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:22:54,159 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:22:54,164 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:22:54,195 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:22:54,211 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:22:54,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54 WrapperNode [2020-07-20 11:22:54,212 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:22:54,214 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:22:54,214 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:22:54,214 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:22:54,316 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,317 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,325 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,325 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,331 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,339 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,340 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (1/1) ... [2020-07-20 11:22:54,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:22:54,344 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:22:54,344 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:22:54,344 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:22:54,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (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 11:22:54,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:22:54,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:22:54,411 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:22:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:22:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:22:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:22:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:22:54,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:22:54,705 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:22:54,706 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 11:22:54,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:22:54 BoogieIcfgContainer [2020-07-20 11:22:54,716 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:22:54,721 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:22:54,722 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:22:54,729 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:22:54,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:22:53" (1/3) ... [2020-07-20 11:22:54,735 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44734a4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:22:54, skipping insertion in model container [2020-07-20 11:22:54,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:22:54" (2/3) ... [2020-07-20 11:22:54,736 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44734a4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:22:54, skipping insertion in model container [2020-07-20 11:22:54,736 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:22:54" (3/3) ... [2020-07-20 11:22:54,745 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_9.c [2020-07-20 11:22:54,772 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:22:54,783 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:22:54,807 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:22:54,847 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:22:54,848 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:22:54,848 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:22:54,848 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:22:54,848 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:22:54,849 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:22:54,849 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:22:54,849 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:22:54,874 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-20 11:22:54,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:22:54,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:54,883 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 11:22:54,883 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:54,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:54,890 INFO L82 PathProgramCache]: Analyzing trace with hash 691982780, now seen corresponding path program 1 times [2020-07-20 11:22:54,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:54,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286947734] [2020-07-20 11:22:54,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:54,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:54,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:54,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:55,046 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 11:22:55,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:55,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286947734] [2020-07-20 11:22:55,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:55,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:55,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550477324] [2020-07-20 11:22:55,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:55,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:55,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:55,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:55,070 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 3 states. [2020-07-20 11:22:55,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:55,145 INFO L93 Difference]: Finished difference Result 81 states and 138 transitions. [2020-07-20 11:22:55,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:55,150 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 11:22:55,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:55,165 INFO L225 Difference]: With dead ends: 81 [2020-07-20 11:22:55,166 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 11:22:55,170 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 11:22:55,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 11:22:55,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-20 11:22:55,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 11:22:55,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 81 transitions. [2020-07-20 11:22:55,217 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 81 transitions. Word has length 19 [2020-07-20 11:22:55,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:55,217 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 81 transitions. [2020-07-20 11:22:55,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:55,218 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 81 transitions. [2020-07-20 11:22:55,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:22:55,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:55,219 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 11:22:55,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:55,427 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:55,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:55,428 INFO L82 PathProgramCache]: Analyzing trace with hash 950148218, now seen corresponding path program 1 times [2020-07-20 11:22:55,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:55,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145602640] [2020-07-20 11:22:55,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:55,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:55,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:55,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:55,512 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 11:22:55,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:55,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145602640] [2020-07-20 11:22:55,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:55,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:55,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568452694] [2020-07-20 11:22:55,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:55,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:55,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:55,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:55,518 INFO L87 Difference]: Start difference. First operand 46 states and 81 transitions. Second operand 3 states. [2020-07-20 11:22:55,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:55,560 INFO L93 Difference]: Finished difference Result 107 states and 192 transitions. [2020-07-20 11:22:55,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:55,562 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 11:22:55,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:55,564 INFO L225 Difference]: With dead ends: 107 [2020-07-20 11:22:55,565 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 11:22:55,568 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 11:22:55,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 11:22:55,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2020-07-20 11:22:55,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 11:22:55,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 113 transitions. [2020-07-20 11:22:55,591 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 113 transitions. Word has length 19 [2020-07-20 11:22:55,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:55,591 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 113 transitions. [2020-07-20 11:22:55,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:55,592 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 113 transitions. [2020-07-20 11:22:55,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:22:55,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:55,594 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 11:22:55,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:55,809 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:55,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:55,810 INFO L82 PathProgramCache]: Analyzing trace with hash -23156596, now seen corresponding path program 1 times [2020-07-20 11:22:55,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:55,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597767206] [2020-07-20 11:22:55,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:55,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:55,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:55,879 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 11:22:55,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:55,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597767206] [2020-07-20 11:22:55,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:55,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:55,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876731235] [2020-07-20 11:22:55,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:55,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:55,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:55,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:55,884 INFO L87 Difference]: Start difference. First operand 64 states and 113 transitions. Second operand 3 states. [2020-07-20 11:22:55,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:55,923 INFO L93 Difference]: Finished difference Result 99 states and 171 transitions. [2020-07-20 11:22:55,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:55,927 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 11:22:55,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:55,929 INFO L225 Difference]: With dead ends: 99 [2020-07-20 11:22:55,929 INFO L226 Difference]: Without dead ends: 69 [2020-07-20 11:22:55,930 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 11:22:55,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-20 11:22:55,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2020-07-20 11:22:55,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 11:22:55,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 115 transitions. [2020-07-20 11:22:55,950 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 115 transitions. Word has length 20 [2020-07-20 11:22:55,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:55,951 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 115 transitions. [2020-07-20 11:22:55,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:55,951 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 115 transitions. [2020-07-20 11:22:55,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:22:55,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:55,953 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 11:22:56,167 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:56,168 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:56,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:56,169 INFO L82 PathProgramCache]: Analyzing trace with hash -609962610, now seen corresponding path program 1 times [2020-07-20 11:22:56,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:56,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765809996] [2020-07-20 11:22:56,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:56,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:56,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:56,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:56,230 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 11:22:56,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:56,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765809996] [2020-07-20 11:22:56,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:56,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:56,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003278797] [2020-07-20 11:22:56,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:56,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:56,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:56,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:56,234 INFO L87 Difference]: Start difference. First operand 67 states and 115 transitions. Second operand 3 states. [2020-07-20 11:22:56,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:56,254 INFO L93 Difference]: Finished difference Result 124 states and 216 transitions. [2020-07-20 11:22:56,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:56,255 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 11:22:56,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:56,257 INFO L225 Difference]: With dead ends: 124 [2020-07-20 11:22:56,257 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 11:22:56,258 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 11:22:56,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 11:22:56,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 88. [2020-07-20 11:22:56,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 11:22:56,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 152 transitions. [2020-07-20 11:22:56,271 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 152 transitions. Word has length 20 [2020-07-20 11:22:56,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:56,271 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 152 transitions. [2020-07-20 11:22:56,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:56,271 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 152 transitions. [2020-07-20 11:22:56,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:22:56,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:56,273 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 11:22:56,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:56,486 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:56,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:56,487 INFO L82 PathProgramCache]: Analyzing trace with hash -351797172, now seen corresponding path program 1 times [2020-07-20 11:22:56,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:56,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780460995] [2020-07-20 11:22:56,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:56,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:56,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:56,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:56,550 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 11:22:56,550 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:56,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780460995] [2020-07-20 11:22:56,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:56,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:56,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481829055] [2020-07-20 11:22:56,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:56,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:56,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:56,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:56,554 INFO L87 Difference]: Start difference. First operand 88 states and 152 transitions. Second operand 3 states. [2020-07-20 11:22:56,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:56,584 INFO L93 Difference]: Finished difference Result 204 states and 358 transitions. [2020-07-20 11:22:56,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:56,584 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 11:22:56,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:56,587 INFO L225 Difference]: With dead ends: 204 [2020-07-20 11:22:56,587 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 11:22:56,588 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 11:22:56,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 11:22:56,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2020-07-20 11:22:56,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 11:22:56,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 210 transitions. [2020-07-20 11:22:56,616 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 210 transitions. Word has length 20 [2020-07-20 11:22:56,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:56,617 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 210 transitions. [2020-07-20 11:22:56,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:56,617 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 210 transitions. [2020-07-20 11:22:56,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:22:56,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:56,620 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 11:22:56,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:56,821 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:56,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:56,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1728757681, now seen corresponding path program 1 times [2020-07-20 11:22:56,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:56,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21047228] [2020-07-20 11:22:56,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:56,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:56,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:56,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:56,885 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 11:22:56,886 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:56,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21047228] [2020-07-20 11:22:56,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:56,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:56,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646302433] [2020-07-20 11:22:56,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:56,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:56,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:56,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:56,888 INFO L87 Difference]: Start difference. First operand 122 states and 210 transitions. Second operand 3 states. [2020-07-20 11:22:56,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:56,907 INFO L93 Difference]: Finished difference Result 183 states and 313 transitions. [2020-07-20 11:22:56,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:56,907 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 11:22:56,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:56,909 INFO L225 Difference]: With dead ends: 183 [2020-07-20 11:22:56,909 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 11:22:56,910 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 11:22:56,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 11:22:56,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2020-07-20 11:22:56,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 11:22:56,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 210 transitions. [2020-07-20 11:22:56,922 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 210 transitions. Word has length 21 [2020-07-20 11:22:56,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:56,922 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 210 transitions. [2020-07-20 11:22:56,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:56,922 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 210 transitions. [2020-07-20 11:22:56,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:22:56,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:56,924 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 11:22:57,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:57,129 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:57,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:57,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1979403601, now seen corresponding path program 1 times [2020-07-20 11:22:57,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:57,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330882033] [2020-07-20 11:22:57,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:57,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:57,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:57,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:57,181 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 11:22:57,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:57,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330882033] [2020-07-20 11:22:57,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:57,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:57,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657488669] [2020-07-20 11:22:57,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:57,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:57,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:57,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:57,184 INFO L87 Difference]: Start difference. First operand 124 states and 210 transitions. Second operand 3 states. [2020-07-20 11:22:57,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:57,204 INFO L93 Difference]: Finished difference Result 228 states and 392 transitions. [2020-07-20 11:22:57,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:57,204 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 11:22:57,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:57,206 INFO L225 Difference]: With dead ends: 228 [2020-07-20 11:22:57,207 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 11:22:57,207 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 11:22:57,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 11:22:57,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 168. [2020-07-20 11:22:57,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-07-20 11:22:57,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 282 transitions. [2020-07-20 11:22:57,224 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 282 transitions. Word has length 21 [2020-07-20 11:22:57,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:57,224 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 282 transitions. [2020-07-20 11:22:57,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:57,225 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 282 transitions. [2020-07-20 11:22:57,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:22:57,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:57,226 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 11:22:57,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:57,440 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:57,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:57,441 INFO L82 PathProgramCache]: Analyzing trace with hash -2057398257, now seen corresponding path program 1 times [2020-07-20 11:22:57,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:57,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623778267] [2020-07-20 11:22:57,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:57,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:57,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:57,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:57,492 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 11:22:57,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:57,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623778267] [2020-07-20 11:22:57,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:57,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:57,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879263925] [2020-07-20 11:22:57,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:57,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:57,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:57,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:57,498 INFO L87 Difference]: Start difference. First operand 168 states and 282 transitions. Second operand 3 states. [2020-07-20 11:22:57,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:57,533 INFO L93 Difference]: Finished difference Result 392 states and 664 transitions. [2020-07-20 11:22:57,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:57,533 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 11:22:57,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:57,537 INFO L225 Difference]: With dead ends: 392 [2020-07-20 11:22:57,537 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 11:22:57,539 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 11:22:57,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 11:22:57,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2020-07-20 11:22:57,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 11:22:57,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 386 transitions. [2020-07-20 11:22:57,576 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 386 transitions. Word has length 21 [2020-07-20 11:22:57,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:57,577 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 386 transitions. [2020-07-20 11:22:57,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:57,577 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 386 transitions. [2020-07-20 11:22:57,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:22:57,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:57,583 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 11:22:57,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:57,785 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:57,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:57,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1232183873, now seen corresponding path program 1 times [2020-07-20 11:22:57,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:57,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595189843] [2020-07-20 11:22:57,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:57,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:57,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:57,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:57,841 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 11:22:57,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:57,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595189843] [2020-07-20 11:22:57,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:57,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:57,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322086459] [2020-07-20 11:22:57,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:57,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:57,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:57,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:57,843 INFO L87 Difference]: Start difference. First operand 232 states and 386 transitions. Second operand 3 states. [2020-07-20 11:22:57,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:57,870 INFO L93 Difference]: Finished difference Result 348 states and 576 transitions. [2020-07-20 11:22:57,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:57,871 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 11:22:57,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:57,873 INFO L225 Difference]: With dead ends: 348 [2020-07-20 11:22:57,873 INFO L226 Difference]: Without dead ends: 238 [2020-07-20 11:22:57,874 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 11:22:57,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-07-20 11:22:57,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 236. [2020-07-20 11:22:57,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 11:22:57,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 386 transitions. [2020-07-20 11:22:57,886 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 386 transitions. Word has length 22 [2020-07-20 11:22:57,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:57,886 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 386 transitions. [2020-07-20 11:22:57,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:57,887 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 386 transitions. [2020-07-20 11:22:57,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:22:57,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:57,889 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 11:22:58,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:58,104 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:58,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:58,105 INFO L82 PathProgramCache]: Analyzing trace with hash 645377859, now seen corresponding path program 1 times [2020-07-20 11:22:58,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:58,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791087396] [2020-07-20 11:22:58,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:58,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:58,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:58,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:58,159 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 11:22:58,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:58,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791087396] [2020-07-20 11:22:58,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:58,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:58,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104964832] [2020-07-20 11:22:58,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:58,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:58,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:58,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:58,162 INFO L87 Difference]: Start difference. First operand 236 states and 386 transitions. Second operand 3 states. [2020-07-20 11:22:58,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:58,184 INFO L93 Difference]: Finished difference Result 428 states and 712 transitions. [2020-07-20 11:22:58,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:58,185 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 11:22:58,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:58,188 INFO L225 Difference]: With dead ends: 428 [2020-07-20 11:22:58,188 INFO L226 Difference]: Without dead ends: 426 [2020-07-20 11:22:58,189 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 11:22:58,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-07-20 11:22:58,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 328. [2020-07-20 11:22:58,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2020-07-20 11:22:58,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 526 transitions. [2020-07-20 11:22:58,202 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 526 transitions. Word has length 22 [2020-07-20 11:22:58,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:58,203 INFO L479 AbstractCegarLoop]: Abstraction has 328 states and 526 transitions. [2020-07-20 11:22:58,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:58,203 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 526 transitions. [2020-07-20 11:22:58,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:22:58,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:58,205 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 11:22:58,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:58,421 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:58,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:58,421 INFO L82 PathProgramCache]: Analyzing trace with hash 903543297, now seen corresponding path program 1 times [2020-07-20 11:22:58,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:58,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86217181] [2020-07-20 11:22:58,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:58,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:58,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:58,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:58,486 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 11:22:58,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:58,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86217181] [2020-07-20 11:22:58,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:58,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:58,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378669403] [2020-07-20 11:22:58,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:58,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:58,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:58,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:58,490 INFO L87 Difference]: Start difference. First operand 328 states and 526 transitions. Second operand 3 states. [2020-07-20 11:22:58,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:58,535 INFO L93 Difference]: Finished difference Result 764 states and 1232 transitions. [2020-07-20 11:22:58,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:58,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 11:22:58,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:58,540 INFO L225 Difference]: With dead ends: 764 [2020-07-20 11:22:58,540 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 11:22:58,544 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 11:22:58,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 11:22:58,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 448. [2020-07-20 11:22:58,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 448 states. [2020-07-20 11:22:58,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 710 transitions. [2020-07-20 11:22:58,579 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 710 transitions. Word has length 22 [2020-07-20 11:22:58,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:58,580 INFO L479 AbstractCegarLoop]: Abstraction has 448 states and 710 transitions. [2020-07-20 11:22:58,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:58,580 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 710 transitions. [2020-07-20 11:22:58,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:22:58,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:58,582 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 11:22:58,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:58,796 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:58,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:58,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1467908124, now seen corresponding path program 1 times [2020-07-20 11:22:58,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:58,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922665362] [2020-07-20 11:22:58,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:58,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:58,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:58,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:58,848 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 11:22:58,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:58,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922665362] [2020-07-20 11:22:58,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:58,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:58,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146575992] [2020-07-20 11:22:58,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:58,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:58,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:58,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:58,853 INFO L87 Difference]: Start difference. First operand 448 states and 710 transitions. Second operand 3 states. [2020-07-20 11:22:58,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:58,887 INFO L93 Difference]: Finished difference Result 672 states and 1060 transitions. [2020-07-20 11:22:58,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:58,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 11:22:58,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:58,892 INFO L225 Difference]: With dead ends: 672 [2020-07-20 11:22:58,892 INFO L226 Difference]: Without dead ends: 458 [2020-07-20 11:22:58,893 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 11:22:58,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-07-20 11:22:58,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 456. [2020-07-20 11:22:58,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-20 11:22:58,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 710 transitions. [2020-07-20 11:22:58,915 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 710 transitions. Word has length 23 [2020-07-20 11:22:58,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:58,916 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 710 transitions. [2020-07-20 11:22:58,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:58,916 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 710 transitions. [2020-07-20 11:22:58,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:22:58,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:58,921 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 11:22:59,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:59,140 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:59,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:59,141 INFO L82 PathProgramCache]: Analyzing trace with hash -2054714138, now seen corresponding path program 1 times [2020-07-20 11:22:59,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:59,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523814595] [2020-07-20 11:22:59,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:59,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:59,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:59,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:59,233 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 11:22:59,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:59,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523814595] [2020-07-20 11:22:59,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:59,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:59,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858602191] [2020-07-20 11:22:59,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:59,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:59,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:59,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:59,239 INFO L87 Difference]: Start difference. First operand 456 states and 710 transitions. Second operand 3 states. [2020-07-20 11:22:59,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:59,279 INFO L93 Difference]: Finished difference Result 812 states and 1288 transitions. [2020-07-20 11:22:59,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:59,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 11:22:59,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:59,287 INFO L225 Difference]: With dead ends: 812 [2020-07-20 11:22:59,287 INFO L226 Difference]: Without dead ends: 810 [2020-07-20 11:22:59,288 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 11:22:59,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-20 11:22:59,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 648. [2020-07-20 11:22:59,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 648 states. [2020-07-20 11:22:59,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 648 states to 648 states and 982 transitions. [2020-07-20 11:22:59,325 INFO L78 Accepts]: Start accepts. Automaton has 648 states and 982 transitions. Word has length 23 [2020-07-20 11:22:59,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:59,325 INFO L479 AbstractCegarLoop]: Abstraction has 648 states and 982 transitions. [2020-07-20 11:22:59,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:59,326 INFO L276 IsEmpty]: Start isEmpty. Operand 648 states and 982 transitions. [2020-07-20 11:22:59,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:22:59,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:59,328 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 11:22:59,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:59,543 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:59,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:59,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1796548700, now seen corresponding path program 1 times [2020-07-20 11:22:59,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:59,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574468704] [2020-07-20 11:22:59,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:59,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:59,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:59,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:59,598 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 11:22:59,599 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:59,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574468704] [2020-07-20 11:22:59,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:59,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:59,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087715528] [2020-07-20 11:22:59,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:59,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:59,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:59,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:59,601 INFO L87 Difference]: Start difference. First operand 648 states and 982 transitions. Second operand 3 states. [2020-07-20 11:22:59,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:59,639 INFO L93 Difference]: Finished difference Result 1500 states and 2280 transitions. [2020-07-20 11:22:59,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:59,640 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 11:22:59,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:59,646 INFO L225 Difference]: With dead ends: 1500 [2020-07-20 11:22:59,647 INFO L226 Difference]: Without dead ends: 874 [2020-07-20 11:22:59,649 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 11:22:59,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874 states. [2020-07-20 11:22:59,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874 to 872. [2020-07-20 11:22:59,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 872 states. [2020-07-20 11:22:59,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 872 states to 872 states and 1302 transitions. [2020-07-20 11:22:59,683 INFO L78 Accepts]: Start accepts. Automaton has 872 states and 1302 transitions. Word has length 23 [2020-07-20 11:22:59,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:22:59,683 INFO L479 AbstractCegarLoop]: Abstraction has 872 states and 1302 transitions. [2020-07-20 11:22:59,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:22:59,684 INFO L276 IsEmpty]: Start isEmpty. Operand 872 states and 1302 transitions. [2020-07-20 11:22:59,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 11:22:59,685 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:22:59,686 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 11:22:59,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:22:59,890 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:22:59,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:22:59,891 INFO L82 PathProgramCache]: Analyzing trace with hash 728586230, now seen corresponding path program 1 times [2020-07-20 11:22:59,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:22:59,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073521678] [2020-07-20 11:22:59,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:22:59,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:22:59,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:22:59,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:22:59,934 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 11:22:59,935 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:22:59,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073521678] [2020-07-20 11:22:59,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:22:59,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:22:59,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047274963] [2020-07-20 11:22:59,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:22:59,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:22:59,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:22:59,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:22:59,937 INFO L87 Difference]: Start difference. First operand 872 states and 1302 transitions. Second operand 3 states. [2020-07-20 11:22:59,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:22:59,963 INFO L93 Difference]: Finished difference Result 1308 states and 1944 transitions. [2020-07-20 11:22:59,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:22:59,963 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 11:22:59,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:22:59,968 INFO L225 Difference]: With dead ends: 1308 [2020-07-20 11:22:59,968 INFO L226 Difference]: Without dead ends: 890 [2020-07-20 11:22:59,970 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 11:22:59,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2020-07-20 11:22:59,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 888. [2020-07-20 11:22:59,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 888 states. [2020-07-20 11:22:59,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1302 transitions. [2020-07-20 11:23:00,000 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1302 transitions. Word has length 24 [2020-07-20 11:23:00,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:00,000 INFO L479 AbstractCegarLoop]: Abstraction has 888 states and 1302 transitions. [2020-07-20 11:23:00,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:00,001 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1302 transitions. [2020-07-20 11:23:00,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 11:23:00,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:00,003 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 11:23:00,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:00,217 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:00,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:00,218 INFO L82 PathProgramCache]: Analyzing trace with hash 141780216, now seen corresponding path program 1 times [2020-07-20 11:23:00,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:00,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614174767] [2020-07-20 11:23:00,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:00,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:00,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:00,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:00,273 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 11:23:00,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:00,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614174767] [2020-07-20 11:23:00,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:00,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:00,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659895067] [2020-07-20 11:23:00,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:00,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:00,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:00,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:00,275 INFO L87 Difference]: Start difference. First operand 888 states and 1302 transitions. Second operand 3 states. [2020-07-20 11:23:00,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:00,308 INFO L93 Difference]: Finished difference Result 1548 states and 2312 transitions. [2020-07-20 11:23:00,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:00,309 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 11:23:00,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:00,316 INFO L225 Difference]: With dead ends: 1548 [2020-07-20 11:23:00,316 INFO L226 Difference]: Without dead ends: 1546 [2020-07-20 11:23:00,317 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 11:23:00,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-20 11:23:00,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1288. [2020-07-20 11:23:00,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1288 states. [2020-07-20 11:23:00,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1288 states to 1288 states and 1830 transitions. [2020-07-20 11:23:00,359 INFO L78 Accepts]: Start accepts. Automaton has 1288 states and 1830 transitions. Word has length 24 [2020-07-20 11:23:00,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:00,359 INFO L479 AbstractCegarLoop]: Abstraction has 1288 states and 1830 transitions. [2020-07-20 11:23:00,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:00,359 INFO L276 IsEmpty]: Start isEmpty. Operand 1288 states and 1830 transitions. [2020-07-20 11:23:00,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 11:23:00,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:00,362 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 11:23:00,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:00,576 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:00,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:00,577 INFO L82 PathProgramCache]: Analyzing trace with hash 399945654, now seen corresponding path program 1 times [2020-07-20 11:23:00,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:00,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676358016] [2020-07-20 11:23:00,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:00,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:00,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:00,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:00,620 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 11:23:00,620 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:00,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676358016] [2020-07-20 11:23:00,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:00,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:00,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847906590] [2020-07-20 11:23:00,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:00,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:00,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:00,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:00,622 INFO L87 Difference]: Start difference. First operand 1288 states and 1830 transitions. Second operand 3 states. [2020-07-20 11:23:00,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:00,667 INFO L93 Difference]: Finished difference Result 2956 states and 4200 transitions. [2020-07-20 11:23:00,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:00,668 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 11:23:00,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:00,677 INFO L225 Difference]: With dead ends: 2956 [2020-07-20 11:23:00,678 INFO L226 Difference]: Without dead ends: 1706 [2020-07-20 11:23:00,683 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 11:23:00,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2020-07-20 11:23:00,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 1704. [2020-07-20 11:23:00,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1704 states. [2020-07-20 11:23:00,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1704 states to 1704 states and 2374 transitions. [2020-07-20 11:23:00,741 INFO L78 Accepts]: Start accepts. Automaton has 1704 states and 2374 transitions. Word has length 24 [2020-07-20 11:23:00,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:00,742 INFO L479 AbstractCegarLoop]: Abstraction has 1704 states and 2374 transitions. [2020-07-20 11:23:00,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:00,742 INFO L276 IsEmpty]: Start isEmpty. Operand 1704 states and 2374 transitions. [2020-07-20 11:23:00,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:23:00,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:00,746 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 11:23:00,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:00,959 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:00,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:00,960 INFO L82 PathProgramCache]: Analyzing trace with hash 100434809, now seen corresponding path program 1 times [2020-07-20 11:23:00,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:00,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672333039] [2020-07-20 11:23:00,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:00,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:00,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:00,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:01,006 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 11:23:01,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:01,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672333039] [2020-07-20 11:23:01,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:01,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:01,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200614515] [2020-07-20 11:23:01,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:01,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:01,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:01,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:01,008 INFO L87 Difference]: Start difference. First operand 1704 states and 2374 transitions. Second operand 3 states. [2020-07-20 11:23:01,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:01,057 INFO L93 Difference]: Finished difference Result 2556 states and 3544 transitions. [2020-07-20 11:23:01,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:01,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 11:23:01,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:01,068 INFO L225 Difference]: With dead ends: 2556 [2020-07-20 11:23:01,068 INFO L226 Difference]: Without dead ends: 1738 [2020-07-20 11:23:01,071 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 11:23:01,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-20 11:23:01,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1736. [2020-07-20 11:23:01,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1736 states. [2020-07-20 11:23:01,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2374 transitions. [2020-07-20 11:23:01,164 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2374 transitions. Word has length 25 [2020-07-20 11:23:01,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:01,164 INFO L479 AbstractCegarLoop]: Abstraction has 1736 states and 2374 transitions. [2020-07-20 11:23:01,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:01,164 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2374 transitions. [2020-07-20 11:23:01,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:23:01,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:01,167 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 11:23:01,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:01,382 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:01,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:01,382 INFO L82 PathProgramCache]: Analyzing trace with hash -486371205, now seen corresponding path program 1 times [2020-07-20 11:23:01,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:01,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145148123] [2020-07-20 11:23:01,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:01,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:01,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:01,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:01,437 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 11:23:01,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:01,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145148123] [2020-07-20 11:23:01,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:01,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:01,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445053476] [2020-07-20 11:23:01,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:01,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:01,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:01,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:01,440 INFO L87 Difference]: Start difference. First operand 1736 states and 2374 transitions. Second operand 3 states. [2020-07-20 11:23:01,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:01,499 INFO L93 Difference]: Finished difference Result 2956 states and 4104 transitions. [2020-07-20 11:23:01,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:01,500 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 11:23:01,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:01,517 INFO L225 Difference]: With dead ends: 2956 [2020-07-20 11:23:01,518 INFO L226 Difference]: Without dead ends: 2954 [2020-07-20 11:23:01,525 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 11:23:01,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-20 11:23:01,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2568. [2020-07-20 11:23:01,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2568 states. [2020-07-20 11:23:01,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2568 states to 2568 states and 3398 transitions. [2020-07-20 11:23:01,633 INFO L78 Accepts]: Start accepts. Automaton has 2568 states and 3398 transitions. Word has length 25 [2020-07-20 11:23:01,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:01,634 INFO L479 AbstractCegarLoop]: Abstraction has 2568 states and 3398 transitions. [2020-07-20 11:23:01,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:01,634 INFO L276 IsEmpty]: Start isEmpty. Operand 2568 states and 3398 transitions. [2020-07-20 11:23:01,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:23:01,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:01,639 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 11:23:01,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:01,855 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:01,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:01,856 INFO L82 PathProgramCache]: Analyzing trace with hash -228205767, now seen corresponding path program 1 times [2020-07-20 11:23:01,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:01,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736990524] [2020-07-20 11:23:01,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:01,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:01,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:01,928 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 11:23:01,928 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:01,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736990524] [2020-07-20 11:23:01,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:01,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:01,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580918817] [2020-07-20 11:23:01,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:01,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:01,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:01,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:01,931 INFO L87 Difference]: Start difference. First operand 2568 states and 3398 transitions. Second operand 3 states. [2020-07-20 11:23:02,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:02,001 INFO L93 Difference]: Finished difference Result 5836 states and 7688 transitions. [2020-07-20 11:23:02,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:02,002 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 11:23:02,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:02,018 INFO L225 Difference]: With dead ends: 5836 [2020-07-20 11:23:02,018 INFO L226 Difference]: Without dead ends: 3338 [2020-07-20 11:23:02,024 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 11:23:02,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-20 11:23:02,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 3336. [2020-07-20 11:23:02,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3336 states. [2020-07-20 11:23:02,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3336 states to 3336 states and 4294 transitions. [2020-07-20 11:23:02,125 INFO L78 Accepts]: Start accepts. Automaton has 3336 states and 4294 transitions. Word has length 25 [2020-07-20 11:23:02,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:02,125 INFO L479 AbstractCegarLoop]: Abstraction has 3336 states and 4294 transitions. [2020-07-20 11:23:02,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:02,126 INFO L276 IsEmpty]: Start isEmpty. Operand 3336 states and 4294 transitions. [2020-07-20 11:23:02,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:23:02,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:02,131 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, 1] [2020-07-20 11:23:02,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:02,346 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:02,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:02,347 INFO L82 PathProgramCache]: Analyzing trace with hash 2102577579, now seen corresponding path program 1 times [2020-07-20 11:23:02,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:02,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495576953] [2020-07-20 11:23:02,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:02,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:02,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:02,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:02,391 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 11:23:02,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:02,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495576953] [2020-07-20 11:23:02,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:02,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:02,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764988000] [2020-07-20 11:23:02,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:02,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:02,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:02,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:02,394 INFO L87 Difference]: Start difference. First operand 3336 states and 4294 transitions. Second operand 3 states. [2020-07-20 11:23:02,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:02,478 INFO L93 Difference]: Finished difference Result 5004 states and 6408 transitions. [2020-07-20 11:23:02,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:02,479 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 11:23:02,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:02,494 INFO L225 Difference]: With dead ends: 5004 [2020-07-20 11:23:02,494 INFO L226 Difference]: Without dead ends: 3402 [2020-07-20 11:23:02,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 11:23:02,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3402 states. [2020-07-20 11:23:02,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3402 to 3400. [2020-07-20 11:23:02,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3400 states. [2020-07-20 11:23:02,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3400 states to 3400 states and 4294 transitions. [2020-07-20 11:23:02,589 INFO L78 Accepts]: Start accepts. Automaton has 3400 states and 4294 transitions. Word has length 26 [2020-07-20 11:23:02,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:02,589 INFO L479 AbstractCegarLoop]: Abstraction has 3400 states and 4294 transitions. [2020-07-20 11:23:02,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:02,589 INFO L276 IsEmpty]: Start isEmpty. Operand 3400 states and 4294 transitions. [2020-07-20 11:23:02,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:23:02,594 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:02,594 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, 1] [2020-07-20 11:23:02,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:02,810 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:02,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:02,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1515771565, now seen corresponding path program 1 times [2020-07-20 11:23:02,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:02,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832633296] [2020-07-20 11:23:02,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:02,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:02,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:02,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:02,852 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 11:23:02,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:02,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832633296] [2020-07-20 11:23:02,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:02,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:02,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068539951] [2020-07-20 11:23:02,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:02,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:02,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:02,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:02,855 INFO L87 Difference]: Start difference. First operand 3400 states and 4294 transitions. Second operand 3 states. [2020-07-20 11:23:02,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:02,949 INFO L93 Difference]: Finished difference Result 9804 states and 12104 transitions. [2020-07-20 11:23:02,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:02,950 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 11:23:02,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:02,979 INFO L225 Difference]: With dead ends: 9804 [2020-07-20 11:23:02,980 INFO L226 Difference]: Without dead ends: 6538 [2020-07-20 11:23:02,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 11:23:02,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6538 states. [2020-07-20 11:23:03,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6538 to 6536. [2020-07-20 11:23:03,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-20 11:23:03,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7814 transitions. [2020-07-20 11:23:03,175 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7814 transitions. Word has length 26 [2020-07-20 11:23:03,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:03,175 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7814 transitions. [2020-07-20 11:23:03,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:03,176 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7814 transitions. [2020-07-20 11:23:03,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:23:03,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:03,187 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, 1] [2020-07-20 11:23:03,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:03,402 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:03,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:03,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1257606127, now seen corresponding path program 1 times [2020-07-20 11:23:03,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:03,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306828065] [2020-07-20 11:23:03,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:03,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:03,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:03,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:03,443 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 11:23:03,443 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:03,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306828065] [2020-07-20 11:23:03,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:03,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:03,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091112968] [2020-07-20 11:23:03,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:03,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:03,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:03,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:03,446 INFO L87 Difference]: Start difference. First operand 6536 states and 7814 transitions. Second operand 3 states. [2020-07-20 11:23:03,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:03,612 INFO L93 Difference]: Finished difference Result 7052 states and 8584 transitions. [2020-07-20 11:23:03,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:03,613 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 11:23:03,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:03,633 INFO L225 Difference]: With dead ends: 7052 [2020-07-20 11:23:03,633 INFO L226 Difference]: Without dead ends: 7050 [2020-07-20 11:23:03,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 11:23:03,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7050 states. [2020-07-20 11:23:03,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7050 to 6536. [2020-07-20 11:23:03,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6536 states. [2020-07-20 11:23:03,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6536 states to 6536 states and 7686 transitions. [2020-07-20 11:23:03,799 INFO L78 Accepts]: Start accepts. Automaton has 6536 states and 7686 transitions. Word has length 26 [2020-07-20 11:23:03,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:03,799 INFO L479 AbstractCegarLoop]: Abstraction has 6536 states and 7686 transitions. [2020-07-20 11:23:03,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:03,800 INFO L276 IsEmpty]: Start isEmpty. Operand 6536 states and 7686 transitions. [2020-07-20 11:23:03,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:23:03,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:03,810 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, 1, 1] [2020-07-20 11:23:04,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:04,027 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:04,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:04,028 INFO L82 PathProgramCache]: Analyzing trace with hash -255505650, now seen corresponding path program 1 times [2020-07-20 11:23:04,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:04,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772918463] [2020-07-20 11:23:04,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:04,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:04,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:04,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:04,097 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 11:23:04,098 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:04,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772918463] [2020-07-20 11:23:04,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:04,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:04,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730675687] [2020-07-20 11:23:04,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:04,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:04,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:04,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:04,099 INFO L87 Difference]: Start difference. First operand 6536 states and 7686 transitions. Second operand 3 states. [2020-07-20 11:23:04,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:04,260 INFO L93 Difference]: Finished difference Result 10634 states and 12423 transitions. [2020-07-20 11:23:04,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:04,260 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 11:23:04,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:04,289 INFO L225 Difference]: With dead ends: 10634 [2020-07-20 11:23:04,289 INFO L226 Difference]: Without dead ends: 10632 [2020-07-20 11:23:04,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 11:23:04,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10632 states. [2020-07-20 11:23:04,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10632 to 10120. [2020-07-20 11:23:04,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10120 states. [2020-07-20 11:23:04,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10120 states to 10120 states and 11654 transitions. [2020-07-20 11:23:04,556 INFO L78 Accepts]: Start accepts. Automaton has 10120 states and 11654 transitions. Word has length 27 [2020-07-20 11:23:04,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:04,556 INFO L479 AbstractCegarLoop]: Abstraction has 10120 states and 11654 transitions. [2020-07-20 11:23:04,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:04,556 INFO L276 IsEmpty]: Start isEmpty. Operand 10120 states and 11654 transitions. [2020-07-20 11:23:04,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:23:04,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:23:04,575 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, 1, 1] [2020-07-20 11:23:04,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:04,790 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:23:04,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:23:04,791 INFO L82 PathProgramCache]: Analyzing trace with hash 2659788, now seen corresponding path program 1 times [2020-07-20 11:23:04,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:23:04,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864536214] [2020-07-20 11:23:04,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:04,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:23:04,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:23:04,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:23:04,828 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 11:23:04,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:23:04,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864536214] [2020-07-20 11:23:04,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:23:04,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:23:04,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952056960] [2020-07-20 11:23:04,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:23:04,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:23:04,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:23:04,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:23:04,830 INFO L87 Difference]: Start difference. First operand 10120 states and 11654 transitions. Second operand 3 states. [2020-07-20 11:23:05,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:23:05,001 INFO L93 Difference]: Finished difference Result 22664 states and 25734 transitions. [2020-07-20 11:23:05,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:23:05,002 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 11:23:05,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:23:05,002 INFO L225 Difference]: With dead ends: 22664 [2020-07-20 11:23:05,002 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:23:05,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 11:23:05,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:23:05,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:23:05,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:23:05,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:23:05,042 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2020-07-20 11:23:05,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:23:05,042 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:23:05,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:23:05,043 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:23:05,043 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:23:05,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:23:05,258 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:23:05,315 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 11:23:05,315 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:23:05,315 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 11:23:05,316 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point L93-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 149) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point L85-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point L110(line 110) no Hoare annotation was computed. [2020-07-20 11:23:05,316 INFO L268 CegarLoopResult]: For program point L77-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L135(line 135) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L69-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L61(lines 61 63) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L61-2(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L119-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point L120(line 120) no Hoare annotation was computed. [2020-07-20 11:23:05,317 INFO L271 CegarLoopResult]: At program point L145(lines 5 149) the Hoare annotation is: true [2020-07-20 11:23:05,317 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 149) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L104-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L129-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 147) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 149) the Hoare annotation is: true [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L105(line 105) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L130(line 130) no Hoare annotation was computed. [2020-07-20 11:23:05,318 INFO L268 CegarLoopResult]: For program point L89-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L114-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L81-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L271 CegarLoopResult]: At program point L139-1(lines 36 144) the Hoare annotation is: true [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L73-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L65-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L115(line 115) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L140(line 140) no Hoare annotation was computed. [2020-07-20 11:23:05,319 INFO L264 CegarLoopResult]: At program point L140-1(lines 5 149) the Hoare annotation is: false [2020-07-20 11:23:05,319 INFO L268 CegarLoopResult]: For program point L99-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,320 INFO L268 CegarLoopResult]: For program point L124-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,320 INFO L268 CegarLoopResult]: For program point L100(line 100) no Hoare annotation was computed. [2020-07-20 11:23:05,320 INFO L268 CegarLoopResult]: For program point L125(line 125) no Hoare annotation was computed. [2020-07-20 11:23:05,320 INFO L268 CegarLoopResult]: For program point L109-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,320 INFO L268 CegarLoopResult]: For program point L134-1(lines 36 144) no Hoare annotation was computed. [2020-07-20 11:23:05,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:23:05 BoogieIcfgContainer [2020-07-20 11:23:05,333 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:23:05,336 INFO L168 Benchmark]: Toolchain (without parser) took 11415.91 ms. Allocated memory was 134.7 MB in the beginning and 357.0 MB in the end (delta: 222.3 MB). Free memory was 98.1 MB in the beginning and 147.9 MB in the end (delta: -49.8 MB). Peak memory consumption was 172.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,337 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 134.7 MB. Free memory was 116.5 MB in the beginning and 116.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,337 INFO L168 Benchmark]: CACSL2BoogieTranslator took 290.79 ms. Allocated memory is still 134.7 MB. Free memory was 97.9 MB in the beginning and 87.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,338 INFO L168 Benchmark]: Boogie Preprocessor took 129.34 ms. Allocated memory was 134.7 MB in the beginning and 198.2 MB in the end (delta: 63.4 MB). Free memory was 87.4 MB in the beginning and 176.2 MB in the end (delta: -88.8 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,338 INFO L168 Benchmark]: RCFGBuilder took 372.97 ms. Allocated memory is still 198.2 MB. Free memory was 176.2 MB in the beginning and 157.5 MB in the end (delta: 18.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,339 INFO L168 Benchmark]: TraceAbstraction took 10611.95 ms. Allocated memory was 198.2 MB in the beginning and 357.0 MB in the end (delta: 158.9 MB). Free memory was 156.8 MB in the beginning and 147.9 MB in the end (delta: 8.9 MB). Peak memory consumption was 167.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:23:05,341 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 134.7 MB. Free memory was 116.5 MB in the beginning and 116.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 290.79 ms. Allocated memory is still 134.7 MB. Free memory was 97.9 MB in the beginning and 87.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.34 ms. Allocated memory was 134.7 MB in the beginning and 198.2 MB in the end (delta: 63.4 MB). Free memory was 87.4 MB in the beginning and 176.2 MB in the end (delta: -88.8 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 372.97 ms. Allocated memory is still 198.2 MB. Free memory was 176.2 MB in the beginning and 157.5 MB in the end (delta: 18.7 MB). Peak memory consumption was 18.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10611.95 ms. Allocated memory was 198.2 MB in the beginning and 357.0 MB in the end (delta: 158.9 MB). Free memory was 156.8 MB in the beginning and 147.9 MB in the end (delta: 8.9 MB). Peak memory consumption was 167.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 147]: 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: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 10.4s, OverallIterations: 25, TraceHistogramMax: 1, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1937 SDtfs, 926 SDslu, 1314 SDs, 0 SdLazy, 133 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 550 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=10120occurred in iteration=24, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.4s AutomataMinimizationTime, 25 MinimizatonAttempts, 2072 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 522 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 575 NumberOfCodeBlocks, 575 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 550 ConstructedInterpolants, 0 QuantifiedInterpolants, 23930 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2552 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 25 InterpolantComputations, 25 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...