/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_10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:13:22,743 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:13:22,746 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:13:22,760 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:13:22,761 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:13:22,762 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:13:22,763 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:13:22,765 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:13:22,767 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:13:22,768 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:13:22,769 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:13:22,771 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:13:22,771 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:13:22,772 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:13:22,774 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:13:22,775 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:13:22,776 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:13:22,777 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:13:22,779 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:13:22,781 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:13:22,783 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:13:22,784 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:13:22,785 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:13:22,786 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:13:22,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:13:22,789 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:13:22,790 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:13:22,791 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:13:22,791 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:13:22,792 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:13:22,792 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:13:22,793 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:13:22,794 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:13:22,795 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:13:22,796 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:13:22,797 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:13:22,797 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:13:22,797 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:13:22,798 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:13:22,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:13:22,800 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:13:22,801 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:13:22,819 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:13:22,820 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:13:22,821 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:13:22,822 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:13:22,822 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:13:22,823 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:13:22,823 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:13:22,824 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:13:22,824 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:13:22,824 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:13:22,825 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:13:22,826 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:13:22,826 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:13:22,827 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:13:22,827 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:13:22,827 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:13:22,827 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:13:22,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:13:22,828 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:13:22,828 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:13:22,829 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:13:22,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:13:22,829 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:13:22,830 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:13:22,831 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 [2020-07-21 11:13:23,183 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:13:23,198 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:13:23,202 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:13:23,204 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:13:23,204 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:13:23,205 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 11:13:23,296 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8753106e8/995f492b118644329163af5d5172d348/FLAG9e639ab86 [2020-07-21 11:13:23,862 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:13:23,863 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 11:13:23,880 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8753106e8/995f492b118644329163af5d5172d348/FLAG9e639ab86 [2020-07-21 11:13:24,166 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8753106e8/995f492b118644329163af5d5172d348 [2020-07-21 11:13:24,176 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:13:24,180 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:13:24,181 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:13:24,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:13:24,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:13:24,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,192 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 21.07 11:13:24, skipping insertion in model container [2020-07-21 11:13:24,193 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,203 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:13:24,229 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:13:24,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:13:24,451 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:13:24,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:13:24,500 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:13:24,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24 WrapperNode [2020-07-21 11:13:24,501 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:13:24,502 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:13:24,503 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:13:24,504 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:13:24,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,618 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,619 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,626 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,638 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,640 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... [2020-07-21 11:13:24,643 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:13:24,644 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:13:24,644 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:13:24,644 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:13:24,646 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:13:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:13:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:13:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:13:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:13:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:13:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:13:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:13:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:13:25,089 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:13:25,089 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:13:25,095 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:13:25 BoogieIcfgContainer [2020-07-21 11:13:25,096 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:13:25,097 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:13:25,097 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:13:25,101 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:13:25,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:13:24" (1/3) ... [2020-07-21 11:13:25,102 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72ac86d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:13:25, skipping insertion in model container [2020-07-21 11:13:25,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:13:24" (2/3) ... [2020-07-21 11:13:25,103 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72ac86d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:13:25, skipping insertion in model container [2020-07-21 11:13:25,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:13:25" (3/3) ... [2020-07-21 11:13:25,105 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-21 11:13:25,121 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:13:25,131 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:13:25,148 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:13:25,176 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:13:25,176 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:13:25,177 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:13:25,177 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:13:25,177 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:13:25,178 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:13:25,178 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:13:25,178 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:13:25,202 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-21 11:13:25,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:13:25,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:25,212 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:13:25,213 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:25,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:25,220 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-21 11:13:25,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:25,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005545060] [2020-07-21 11:13:25,230 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 [2020-07-21 11:13:25,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:25,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:25,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:25,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:25,371 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:25,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005545060] [2020-07-21 11:13:25,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:25,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:25,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235002278] [2020-07-21 11:13:25,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:25,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:25,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:25,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:25,402 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-21 11:13:25,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:25,477 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-21 11:13:25,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:25,479 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 11:13:25,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:25,492 INFO L225 Difference]: With dead ends: 87 [2020-07-21 11:13:25,493 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 11:13:25,497 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 [2020-07-21 11:13:25,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 11:13:25,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 11:13:25,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 11:13:25,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-21 11:13:25,543 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-21 11:13:25,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:25,544 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-21 11:13:25,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:25,545 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-21 11:13:25,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:13:25,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:25,546 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:13:25,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:25,754 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:25,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:25,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-21 11:13:25,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:25,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006827376] [2020-07-21 11:13:25,757 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 [2020-07-21 11:13:25,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:25,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:25,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:25,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:25,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:25,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006827376] [2020-07-21 11:13:25,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:25,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:25,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211433515] [2020-07-21 11:13:25,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:25,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:25,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:25,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:25,888 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-21 11:13:25,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:25,930 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-21 11:13:25,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:25,931 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 11:13:25,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:25,933 INFO L225 Difference]: With dead ends: 117 [2020-07-21 11:13:25,933 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 11:13:25,935 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 [2020-07-21 11:13:25,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 11:13:25,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-21 11:13:25,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 11:13:25,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-21 11:13:25,948 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-21 11:13:25,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:25,949 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-21 11:13:25,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:25,949 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-21 11:13:25,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 11:13:25,950 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:25,951 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] [2020-07-21 11:13:26,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:26,165 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:26,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:26,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-21 11:13:26,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:26,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242131334] [2020-07-21 11:13:26,169 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 [2020-07-21 11:13:26,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:26,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:26,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:26,242 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:26,242 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:26,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242131334] [2020-07-21 11:13:26,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:26,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:26,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917198647] [2020-07-21 11:13:26,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:26,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:26,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:26,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:26,246 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-21 11:13:26,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:26,270 INFO L93 Difference]: Finished difference Result 108 states and 189 transitions. [2020-07-21 11:13:26,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:26,271 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 11:13:26,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:26,272 INFO L225 Difference]: With dead ends: 108 [2020-07-21 11:13:26,273 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 11:13:26,277 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 [2020-07-21 11:13:26,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 11:13:26,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-07-21 11:13:26,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 11:13:26,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions. [2020-07-21 11:13:26,292 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21 [2020-07-21 11:13:26,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:26,292 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 127 transitions. [2020-07-21 11:13:26,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:26,293 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions. [2020-07-21 11:13:26,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 11:13:26,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:26,296 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] [2020-07-21 11:13:26,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:26,499 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:26,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:26,499 INFO L82 PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times [2020-07-21 11:13:26,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:26,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111115329] [2020-07-21 11:13:26,501 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 [2020-07-21 11:13:26,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:26,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:26,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:26,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:26,568 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:26,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111115329] [2020-07-21 11:13:26,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:26,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:26,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575467340] [2020-07-21 11:13:26,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:26,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:26,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:26,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:26,571 INFO L87 Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states. [2020-07-21 11:13:26,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:26,605 INFO L93 Difference]: Finished difference Result 136 states and 240 transitions. [2020-07-21 11:13:26,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:26,606 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 11:13:26,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:26,608 INFO L225 Difference]: With dead ends: 136 [2020-07-21 11:13:26,609 INFO L226 Difference]: Without dead ends: 134 [2020-07-21 11:13:26,610 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 [2020-07-21 11:13:26,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-21 11:13:26,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96. [2020-07-21 11:13:26,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 11:13:26,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions. [2020-07-21 11:13:26,628 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21 [2020-07-21 11:13:26,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:26,629 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 168 transitions. [2020-07-21 11:13:26,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:26,629 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions. [2020-07-21 11:13:26,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 11:13:26,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:26,631 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] [2020-07-21 11:13:26,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:26,848 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:26,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:26,849 INFO L82 PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times [2020-07-21 11:13:26,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:26,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753148370] [2020-07-21 11:13:26,850 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 [2020-07-21 11:13:26,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:26,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:26,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:26,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:26,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:26,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753148370] [2020-07-21 11:13:26,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:26,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:26,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361999866] [2020-07-21 11:13:26,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:26,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:26,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:26,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:26,949 INFO L87 Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states. [2020-07-21 11:13:26,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:26,972 INFO L93 Difference]: Finished difference Result 224 states and 398 transitions. [2020-07-21 11:13:26,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:26,973 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 11:13:26,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:26,975 INFO L225 Difference]: With dead ends: 224 [2020-07-21 11:13:26,975 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 11:13:26,977 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 [2020-07-21 11:13:26,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 11:13:26,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2020-07-21 11:13:26,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 11:13:26,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions. [2020-07-21 11:13:26,990 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21 [2020-07-21 11:13:26,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:26,990 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 234 transitions. [2020-07-21 11:13:26,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:26,990 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions. [2020-07-21 11:13:26,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 11:13:26,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:26,992 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:13:27,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:27,208 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:27,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:27,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times [2020-07-21 11:13:27,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:27,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756830118] [2020-07-21 11:13:27,210 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 [2020-07-21 11:13:27,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:27,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:27,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:27,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:27,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:27,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756830118] [2020-07-21 11:13:27,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:27,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:27,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528099088] [2020-07-21 11:13:27,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:27,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:27,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:27,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:27,279 INFO L87 Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states. [2020-07-21 11:13:27,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:27,302 INFO L93 Difference]: Finished difference Result 201 states and 349 transitions. [2020-07-21 11:13:27,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:27,302 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 11:13:27,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:27,304 INFO L225 Difference]: With dead ends: 201 [2020-07-21 11:13:27,304 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 11:13:27,306 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 [2020-07-21 11:13:27,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 11:13:27,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 11:13:27,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 11:13:27,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions. [2020-07-21 11:13:27,333 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22 [2020-07-21 11:13:27,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:27,333 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 234 transitions. [2020-07-21 11:13:27,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:27,333 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions. [2020-07-21 11:13:27,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 11:13:27,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:27,335 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:13:27,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:27,547 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:27,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:27,548 INFO L82 PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times [2020-07-21 11:13:27,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:27,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574395186] [2020-07-21 11:13:27,549 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 [2020-07-21 11:13:27,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:27,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:27,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:27,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:27,598 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:27,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574395186] [2020-07-21 11:13:27,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:27,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:27,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253480396] [2020-07-21 11:13:27,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:27,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:27,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:27,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:27,601 INFO L87 Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states. [2020-07-21 11:13:27,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:27,632 INFO L93 Difference]: Finished difference Result 252 states and 440 transitions. [2020-07-21 11:13:27,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:27,633 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 11:13:27,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:27,638 INFO L225 Difference]: With dead ends: 252 [2020-07-21 11:13:27,638 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 11:13:27,639 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 [2020-07-21 11:13:27,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 11:13:27,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184. [2020-07-21 11:13:27,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 11:13:27,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions. [2020-07-21 11:13:27,675 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22 [2020-07-21 11:13:27,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:27,676 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 314 transitions. [2020-07-21 11:13:27,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:27,676 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions. [2020-07-21 11:13:27,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 11:13:27,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:27,683 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:13:27,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:27,897 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:27,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:27,898 INFO L82 PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times [2020-07-21 11:13:27,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:27,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769026061] [2020-07-21 11:13:27,898 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 [2020-07-21 11:13:27,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:27,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:27,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:27,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:27,952 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:27,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769026061] [2020-07-21 11:13:27,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:27,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:27,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903596146] [2020-07-21 11:13:27,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:27,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:27,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:27,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:27,955 INFO L87 Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states. [2020-07-21 11:13:27,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:27,982 INFO L93 Difference]: Finished difference Result 432 states and 744 transitions. [2020-07-21 11:13:27,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:27,983 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 11:13:27,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:27,987 INFO L225 Difference]: With dead ends: 432 [2020-07-21 11:13:27,987 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 11:13:27,988 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 [2020-07-21 11:13:27,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 11:13:28,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 11:13:28,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 11:13:28,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions. [2020-07-21 11:13:28,010 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22 [2020-07-21 11:13:28,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:28,015 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 434 transitions. [2020-07-21 11:13:28,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:28,015 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions. [2020-07-21 11:13:28,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:13:28,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:28,019 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] [2020-07-21 11:13:28,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:28,221 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:28,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:28,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times [2020-07-21 11:13:28,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:28,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269104808] [2020-07-21 11:13:28,223 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 [2020-07-21 11:13:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:28,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:28,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:28,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:28,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:28,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269104808] [2020-07-21 11:13:28,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:28,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:28,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235327128] [2020-07-21 11:13:28,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:28,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:28,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:28,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:28,278 INFO L87 Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states. [2020-07-21 11:13:28,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:28,308 INFO L93 Difference]: Finished difference Result 384 states and 648 transitions. [2020-07-21 11:13:28,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:28,309 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 11:13:28,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:28,312 INFO L225 Difference]: With dead ends: 384 [2020-07-21 11:13:28,312 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 11:13:28,313 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 [2020-07-21 11:13:28,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 11:13:28,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 260. [2020-07-21 11:13:28,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 11:13:28,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 434 transitions. [2020-07-21 11:13:28,325 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 434 transitions. Word has length 23 [2020-07-21 11:13:28,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:28,326 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 434 transitions. [2020-07-21 11:13:28,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:28,326 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 434 transitions. [2020-07-21 11:13:28,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:13:28,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:28,328 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] [2020-07-21 11:13:28,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:28,542 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:28,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:28,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1385664132, now seen corresponding path program 1 times [2020-07-21 11:13:28,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:28,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005664289] [2020-07-21 11:13:28,544 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 [2020-07-21 11:13:28,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:28,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:28,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:28,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:28,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:28,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005664289] [2020-07-21 11:13:28,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:28,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:28,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280192551] [2020-07-21 11:13:28,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:28,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:28,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:28,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:28,604 INFO L87 Difference]: Start difference. First operand 260 states and 434 transitions. Second operand 3 states. [2020-07-21 11:13:28,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:28,641 INFO L93 Difference]: Finished difference Result 476 states and 808 transitions. [2020-07-21 11:13:28,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:28,641 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 11:13:28,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:28,645 INFO L225 Difference]: With dead ends: 476 [2020-07-21 11:13:28,645 INFO L226 Difference]: Without dead ends: 474 [2020-07-21 11:13:28,646 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 [2020-07-21 11:13:28,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2020-07-21 11:13:28,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 360. [2020-07-21 11:13:28,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 11:13:28,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions. [2020-07-21 11:13:28,664 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23 [2020-07-21 11:13:28,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:28,664 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 590 transitions. [2020-07-21 11:13:28,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:28,664 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions. [2020-07-21 11:13:28,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:13:28,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:28,666 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] [2020-07-21 11:13:28,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:28,880 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:28,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:28,881 INFO L82 PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times [2020-07-21 11:13:28,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:28,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252875039] [2020-07-21 11:13:28,883 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 [2020-07-21 11:13:28,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:28,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:28,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:28,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:28,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:28,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252875039] [2020-07-21 11:13:28,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:28,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:28,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834287432] [2020-07-21 11:13:28,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:28,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:28,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:28,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:28,949 INFO L87 Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states. [2020-07-21 11:13:28,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:28,992 INFO L93 Difference]: Finished difference Result 844 states and 1392 transitions. [2020-07-21 11:13:28,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:28,993 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 11:13:28,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:28,999 INFO L225 Difference]: With dead ends: 844 [2020-07-21 11:13:28,999 INFO L226 Difference]: Without dead ends: 498 [2020-07-21 11:13:29,001 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 [2020-07-21 11:13:29,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2020-07-21 11:13:29,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496. [2020-07-21 11:13:29,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-21 11:13:29,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions. [2020-07-21 11:13:29,034 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23 [2020-07-21 11:13:29,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:29,035 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 806 transitions. [2020-07-21 11:13:29,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:29,035 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions. [2020-07-21 11:13:29,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 11:13:29,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:29,040 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] [2020-07-21 11:13:29,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:29,255 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:29,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:29,256 INFO L82 PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times [2020-07-21 11:13:29,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:29,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535351483] [2020-07-21 11:13:29,258 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 [2020-07-21 11:13:29,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:29,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:29,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:29,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:29,307 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:29,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535351483] [2020-07-21 11:13:29,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:29,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:29,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18138326] [2020-07-21 11:13:29,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:29,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:29,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:29,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:29,310 INFO L87 Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states. [2020-07-21 11:13:29,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:29,335 INFO L93 Difference]: Finished difference Result 744 states and 1204 transitions. [2020-07-21 11:13:29,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:29,336 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 11:13:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:29,339 INFO L225 Difference]: With dead ends: 744 [2020-07-21 11:13:29,340 INFO L226 Difference]: Without dead ends: 506 [2020-07-21 11:13:29,341 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 [2020-07-21 11:13:29,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2020-07-21 11:13:29,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 504. [2020-07-21 11:13:29,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 504 states. [2020-07-21 11:13:29,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 806 transitions. [2020-07-21 11:13:29,372 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 806 transitions. Word has length 24 [2020-07-21 11:13:29,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:29,372 INFO L479 AbstractCegarLoop]: Abstraction has 504 states and 806 transitions. [2020-07-21 11:13:29,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:29,373 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 806 transitions. [2020-07-21 11:13:29,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 11:13:29,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:29,374 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] [2020-07-21 11:13:29,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:29,589 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:29,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:29,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1004987715, now seen corresponding path program 1 times [2020-07-21 11:13:29,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:29,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710288565] [2020-07-21 11:13:29,591 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 [2020-07-21 11:13:29,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:29,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:29,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:29,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:29,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:29,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710288565] [2020-07-21 11:13:29,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:29,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:29,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553781072] [2020-07-21 11:13:29,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:29,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:29,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:29,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:29,659 INFO L87 Difference]: Start difference. First operand 504 states and 806 transitions. Second operand 3 states. [2020-07-21 11:13:29,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:29,699 INFO L93 Difference]: Finished difference Result 908 states and 1480 transitions. [2020-07-21 11:13:29,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:29,701 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 11:13:29,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:29,707 INFO L225 Difference]: With dead ends: 908 [2020-07-21 11:13:29,708 INFO L226 Difference]: Without dead ends: 906 [2020-07-21 11:13:29,709 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 [2020-07-21 11:13:29,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 906 states. [2020-07-21 11:13:29,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 906 to 712. [2020-07-21 11:13:29,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 712 states. [2020-07-21 11:13:29,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 1110 transitions. [2020-07-21 11:13:29,740 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 1110 transitions. Word has length 24 [2020-07-21 11:13:29,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:29,740 INFO L479 AbstractCegarLoop]: Abstraction has 712 states and 1110 transitions. [2020-07-21 11:13:29,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:29,741 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 1110 transitions. [2020-07-21 11:13:29,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 11:13:29,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:29,743 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] [2020-07-21 11:13:29,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:29,959 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:29,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:29,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1591793729, now seen corresponding path program 1 times [2020-07-21 11:13:29,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:29,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847875894] [2020-07-21 11:13:29,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 11:13:29,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:29,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:29,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:30,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:30,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:30,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847875894] [2020-07-21 11:13:30,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:30,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:30,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602341260] [2020-07-21 11:13:30,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:30,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:30,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:30,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:30,010 INFO L87 Difference]: Start difference. First operand 712 states and 1110 transitions. Second operand 3 states. [2020-07-21 11:13:30,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:30,047 INFO L93 Difference]: Finished difference Result 1660 states and 2600 transitions. [2020-07-21 11:13:30,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:30,047 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 11:13:30,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:30,054 INFO L225 Difference]: With dead ends: 1660 [2020-07-21 11:13:30,054 INFO L226 Difference]: Without dead ends: 970 [2020-07-21 11:13:30,056 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 [2020-07-21 11:13:30,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-07-21 11:13:30,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 968. [2020-07-21 11:13:30,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 968 states. [2020-07-21 11:13:30,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 968 states to 968 states and 1494 transitions. [2020-07-21 11:13:30,092 INFO L78 Accepts]: Start accepts. Automaton has 968 states and 1494 transitions. Word has length 24 [2020-07-21 11:13:30,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:30,093 INFO L479 AbstractCegarLoop]: Abstraction has 968 states and 1494 transitions. [2020-07-21 11:13:30,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:30,093 INFO L276 IsEmpty]: Start isEmpty. Operand 968 states and 1494 transitions. [2020-07-21 11:13:30,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:13:30,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:30,096 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] [2020-07-21 11:13:30,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:30,309 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:30,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:30,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1089633349, now seen corresponding path program 1 times [2020-07-21 11:13:30,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:30,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336132062] [2020-07-21 11:13:30,311 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 [2020-07-21 11:13:30,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:30,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:30,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:30,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:30,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:30,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336132062] [2020-07-21 11:13:30,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:30,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:30,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328213881] [2020-07-21 11:13:30,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:30,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:30,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:30,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:30,372 INFO L87 Difference]: Start difference. First operand 968 states and 1494 transitions. Second operand 3 states. [2020-07-21 11:13:30,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:30,404 INFO L93 Difference]: Finished difference Result 1452 states and 2232 transitions. [2020-07-21 11:13:30,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:30,405 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 11:13:30,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:30,411 INFO L225 Difference]: With dead ends: 1452 [2020-07-21 11:13:30,412 INFO L226 Difference]: Without dead ends: 986 [2020-07-21 11:13:30,414 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 [2020-07-21 11:13:30,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-21 11:13:30,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 984. [2020-07-21 11:13:30,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 11:13:30,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1494 transitions. [2020-07-21 11:13:30,452 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1494 transitions. Word has length 25 [2020-07-21 11:13:30,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:30,452 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1494 transitions. [2020-07-21 11:13:30,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:30,452 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1494 transitions. [2020-07-21 11:13:30,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:13:30,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:30,454 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] [2020-07-21 11:13:30,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:30,671 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:30,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:30,671 INFO L82 PathProgramCache]: Analyzing trace with hash -2100750599, now seen corresponding path program 1 times [2020-07-21 11:13:30,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:30,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050522764] [2020-07-21 11:13:30,672 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 [2020-07-21 11:13:30,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:30,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:30,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:30,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:30,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:30,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050522764] [2020-07-21 11:13:30,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:30,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:30,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258849807] [2020-07-21 11:13:30,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:30,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:30,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:30,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:30,719 INFO L87 Difference]: Start difference. First operand 984 states and 1494 transitions. Second operand 3 states. [2020-07-21 11:13:30,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:30,757 INFO L93 Difference]: Finished difference Result 1740 states and 2696 transitions. [2020-07-21 11:13:30,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:30,758 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 11:13:30,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:30,767 INFO L225 Difference]: With dead ends: 1740 [2020-07-21 11:13:30,767 INFO L226 Difference]: Without dead ends: 1738 [2020-07-21 11:13:30,769 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 [2020-07-21 11:13:30,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-21 11:13:30,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1416. [2020-07-21 11:13:30,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1416 states. [2020-07-21 11:13:30,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1416 states to 1416 states and 2086 transitions. [2020-07-21 11:13:30,818 INFO L78 Accepts]: Start accepts. Automaton has 1416 states and 2086 transitions. Word has length 25 [2020-07-21 11:13:30,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:30,819 INFO L479 AbstractCegarLoop]: Abstraction has 1416 states and 2086 transitions. [2020-07-21 11:13:30,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:30,819 INFO L276 IsEmpty]: Start isEmpty. Operand 1416 states and 2086 transitions. [2020-07-21 11:13:30,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:13:30,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:30,823 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] [2020-07-21 11:13:31,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:31,038 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:31,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:31,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1607410683, now seen corresponding path program 1 times [2020-07-21 11:13:31,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:31,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788237320] [2020-07-21 11:13:31,040 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 [2020-07-21 11:13:31,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:31,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:31,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:31,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:31,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:31,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788237320] [2020-07-21 11:13:31,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:31,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:31,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237709173] [2020-07-21 11:13:31,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:31,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:31,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:31,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:31,095 INFO L87 Difference]: Start difference. First operand 1416 states and 2086 transitions. Second operand 3 states. [2020-07-21 11:13:31,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:31,154 INFO L93 Difference]: Finished difference Result 3276 states and 4840 transitions. [2020-07-21 11:13:31,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:31,154 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 11:13:31,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:31,163 INFO L225 Difference]: With dead ends: 3276 [2020-07-21 11:13:31,164 INFO L226 Difference]: Without dead ends: 1898 [2020-07-21 11:13:31,167 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 [2020-07-21 11:13:31,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2020-07-21 11:13:31,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1896. [2020-07-21 11:13:31,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1896 states. [2020-07-21 11:13:31,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2758 transitions. [2020-07-21 11:13:31,228 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2758 transitions. Word has length 25 [2020-07-21 11:13:31,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:31,229 INFO L479 AbstractCegarLoop]: Abstraction has 1896 states and 2758 transitions. [2020-07-21 11:13:31,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:31,229 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2758 transitions. [2020-07-21 11:13:31,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 11:13:31,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:31,232 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] [2020-07-21 11:13:31,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:31,449 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:31,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:31,449 INFO L82 PathProgramCache]: Analyzing trace with hash -698544044, now seen corresponding path program 1 times [2020-07-21 11:13:31,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:31,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909723211] [2020-07-21 11:13:31,450 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 [2020-07-21 11:13:31,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:31,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:31,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:31,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:31,486 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:31,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909723211] [2020-07-21 11:13:31,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:31,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:31,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632876547] [2020-07-21 11:13:31,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:31,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:31,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:31,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:31,493 INFO L87 Difference]: Start difference. First operand 1896 states and 2758 transitions. Second operand 3 states. [2020-07-21 11:13:31,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:31,542 INFO L93 Difference]: Finished difference Result 2844 states and 4120 transitions. [2020-07-21 11:13:31,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:31,543 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 11:13:31,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:31,553 INFO L225 Difference]: With dead ends: 2844 [2020-07-21 11:13:31,553 INFO L226 Difference]: Without dead ends: 1930 [2020-07-21 11:13:31,556 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 [2020-07-21 11:13:31,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-21 11:13:31,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1928. [2020-07-21 11:13:31,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1928 states. [2020-07-21 11:13:31,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1928 states to 1928 states and 2758 transitions. [2020-07-21 11:13:31,625 INFO L78 Accepts]: Start accepts. Automaton has 1928 states and 2758 transitions. Word has length 26 [2020-07-21 11:13:31,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:31,625 INFO L479 AbstractCegarLoop]: Abstraction has 1928 states and 2758 transitions. [2020-07-21 11:13:31,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:31,626 INFO L276 IsEmpty]: Start isEmpty. Operand 1928 states and 2758 transitions. [2020-07-21 11:13:31,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 11:13:31,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:31,629 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] [2020-07-21 11:13:31,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:31,843 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:31,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:31,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1709661294, now seen corresponding path program 1 times [2020-07-21 11:13:31,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:31,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488881889] [2020-07-21 11:13:31,844 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 [2020-07-21 11:13:31,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:31,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:31,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:31,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:31,887 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:31,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488881889] [2020-07-21 11:13:31,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:31,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:31,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132676527] [2020-07-21 11:13:31,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:31,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:31,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:31,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:31,892 INFO L87 Difference]: Start difference. First operand 1928 states and 2758 transitions. Second operand 3 states. [2020-07-21 11:13:31,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:31,942 INFO L93 Difference]: Finished difference Result 3340 states and 4872 transitions. [2020-07-21 11:13:31,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:31,943 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 11:13:31,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:31,961 INFO L225 Difference]: With dead ends: 3340 [2020-07-21 11:13:31,961 INFO L226 Difference]: Without dead ends: 3338 [2020-07-21 11:13:31,969 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 [2020-07-21 11:13:31,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-21 11:13:32,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 2824. [2020-07-21 11:13:32,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2824 states. [2020-07-21 11:13:32,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2824 states to 2824 states and 3910 transitions. [2020-07-21 11:13:32,063 INFO L78 Accepts]: Start accepts. Automaton has 2824 states and 3910 transitions. Word has length 26 [2020-07-21 11:13:32,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:32,064 INFO L479 AbstractCegarLoop]: Abstraction has 2824 states and 3910 transitions. [2020-07-21 11:13:32,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:32,064 INFO L276 IsEmpty]: Start isEmpty. Operand 2824 states and 3910 transitions. [2020-07-21 11:13:32,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 11:13:32,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:32,069 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] [2020-07-21 11:13:32,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:32,284 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:32,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:32,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1998499988, now seen corresponding path program 1 times [2020-07-21 11:13:32,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:32,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013900865] [2020-07-21 11:13:32,285 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 [2020-07-21 11:13:32,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:32,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:32,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:32,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:32,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013900865] [2020-07-21 11:13:32,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:32,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:32,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100256101] [2020-07-21 11:13:32,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:32,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:32,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:32,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:32,355 INFO L87 Difference]: Start difference. First operand 2824 states and 3910 transitions. Second operand 3 states. [2020-07-21 11:13:32,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:32,415 INFO L93 Difference]: Finished difference Result 6476 states and 8968 transitions. [2020-07-21 11:13:32,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:32,418 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 11:13:32,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:32,434 INFO L225 Difference]: With dead ends: 6476 [2020-07-21 11:13:32,434 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 11:13:32,440 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 [2020-07-21 11:13:32,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 11:13:32,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2020-07-21 11:13:32,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3720 states. [2020-07-21 11:13:32,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions. [2020-07-21 11:13:32,540 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 26 [2020-07-21 11:13:32,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:32,540 INFO L479 AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions. [2020-07-21 11:13:32,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:32,541 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions. [2020-07-21 11:13:32,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:13:32,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:32,546 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] [2020-07-21 11:13:32,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:32,761 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:32,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:32,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times [2020-07-21 11:13:32,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:32,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667137647] [2020-07-21 11:13:32,762 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 [2020-07-21 11:13:32,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:32,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:32,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:32,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:32,805 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:32,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667137647] [2020-07-21 11:13:32,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:32,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:32,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378618367] [2020-07-21 11:13:32,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:32,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:32,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:32,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:32,807 INFO L87 Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states. [2020-07-21 11:13:32,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:32,863 INFO L93 Difference]: Finished difference Result 5580 states and 7560 transitions. [2020-07-21 11:13:32,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:32,864 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 11:13:32,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:32,880 INFO L225 Difference]: With dead ends: 5580 [2020-07-21 11:13:32,880 INFO L226 Difference]: Without dead ends: 3786 [2020-07-21 11:13:32,884 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 [2020-07-21 11:13:32,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2020-07-21 11:13:32,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 3784. [2020-07-21 11:13:32,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3784 states. [2020-07-21 11:13:32,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3784 states to 3784 states and 5062 transitions. [2020-07-21 11:13:32,972 INFO L78 Accepts]: Start accepts. Automaton has 3784 states and 5062 transitions. Word has length 27 [2020-07-21 11:13:32,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:32,973 INFO L479 AbstractCegarLoop]: Abstraction has 3784 states and 5062 transitions. [2020-07-21 11:13:32,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:32,973 INFO L276 IsEmpty]: Start isEmpty. Operand 3784 states and 5062 transitions. [2020-07-21 11:13:32,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:13:32,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:32,978 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] [2020-07-21 11:13:33,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:33,193 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:33,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:33,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1824172910, now seen corresponding path program 1 times [2020-07-21 11:13:33,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:33,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081127461] [2020-07-21 11:13:33,195 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 [2020-07-21 11:13:33,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:33,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:33,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:33,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:33,237 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:33,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081127461] [2020-07-21 11:13:33,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:33,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:33,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588332818] [2020-07-21 11:13:33,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:33,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:33,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:33,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:33,239 INFO L87 Difference]: Start difference. First operand 3784 states and 5062 transitions. Second operand 3 states. [2020-07-21 11:13:33,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:33,369 INFO L93 Difference]: Finished difference Result 10956 states and 14408 transitions. [2020-07-21 11:13:33,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:33,370 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 11:13:33,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:33,415 INFO L225 Difference]: With dead ends: 10956 [2020-07-21 11:13:33,415 INFO L226 Difference]: Without dead ends: 7306 [2020-07-21 11:13:33,425 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 [2020-07-21 11:13:33,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2020-07-21 11:13:33,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7304. [2020-07-21 11:13:33,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 11:13:33,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9350 transitions. [2020-07-21 11:13:33,587 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9350 transitions. Word has length 27 [2020-07-21 11:13:33,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:33,588 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9350 transitions. [2020-07-21 11:13:33,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:33,588 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9350 transitions. [2020-07-21 11:13:33,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:13:33,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:33,598 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] [2020-07-21 11:13:33,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:33,812 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:33,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:33,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1883988372, now seen corresponding path program 1 times [2020-07-21 11:13:33,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:33,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796066191] [2020-07-21 11:13:33,814 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 [2020-07-21 11:13:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:33,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:33,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:33,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:33,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:33,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796066191] [2020-07-21 11:13:33,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:33,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:33,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791919115] [2020-07-21 11:13:33,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:33,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:33,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:33,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:33,859 INFO L87 Difference]: Start difference. First operand 7304 states and 9350 transitions. Second operand 3 states. [2020-07-21 11:13:33,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:33,971 INFO L93 Difference]: Finished difference Result 8076 states and 10632 transitions. [2020-07-21 11:13:33,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:33,972 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 11:13:33,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:33,988 INFO L225 Difference]: With dead ends: 8076 [2020-07-21 11:13:33,988 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 11:13:33,992 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 [2020-07-21 11:13:34,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 11:13:34,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 7304. [2020-07-21 11:13:34,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 11:13:34,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9222 transitions. [2020-07-21 11:13:34,172 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9222 transitions. Word has length 27 [2020-07-21 11:13:34,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:34,172 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9222 transitions. [2020-07-21 11:13:34,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:34,172 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9222 transitions. [2020-07-21 11:13:34,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 11:13:34,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:34,182 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, 1] [2020-07-21 11:13:34,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:34,396 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:34,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:34,396 INFO L82 PathProgramCache]: Analyzing trace with hash 715001129, now seen corresponding path program 1 times [2020-07-21 11:13:34,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:34,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741677341] [2020-07-21 11:13:34,397 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 [2020-07-21 11:13:34,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:34,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:34,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:34,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:34,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:34,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741677341] [2020-07-21 11:13:34,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:34,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:34,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725438578] [2020-07-21 11:13:34,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:34,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:34,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:34,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:34,440 INFO L87 Difference]: Start difference. First operand 7304 states and 9222 transitions. Second operand 3 states. [2020-07-21 11:13:34,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:34,574 INFO L93 Difference]: Finished difference Result 12172 states and 15496 transitions. [2020-07-21 11:13:34,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:34,575 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 11:13:34,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:34,596 INFO L225 Difference]: With dead ends: 12172 [2020-07-21 11:13:34,597 INFO L226 Difference]: Without dead ends: 12170 [2020-07-21 11:13:34,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:34,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12170 states. [2020-07-21 11:13:34,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12170 to 11144. [2020-07-21 11:13:34,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11144 states. [2020-07-21 11:13:34,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11144 states to 11144 states and 13702 transitions. [2020-07-21 11:13:34,880 INFO L78 Accepts]: Start accepts. Automaton has 11144 states and 13702 transitions. Word has length 28 [2020-07-21 11:13:34,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:34,881 INFO L479 AbstractCegarLoop]: Abstraction has 11144 states and 13702 transitions. [2020-07-21 11:13:34,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:34,881 INFO L276 IsEmpty]: Start isEmpty. Operand 11144 states and 13702 transitions. [2020-07-21 11:13:34,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 11:13:34,899 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:34,900 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, 1] [2020-07-21 11:13:35,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:35,113 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:35,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:35,113 INFO L82 PathProgramCache]: Analyzing trace with hash 128195115, now seen corresponding path program 1 times [2020-07-21 11:13:35,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:35,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738281789] [2020-07-21 11:13:35,114 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 [2020-07-21 11:13:35,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:35,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:35,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:35,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:35,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:35,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738281789] [2020-07-21 11:13:35,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:35,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:35,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93498488] [2020-07-21 11:13:35,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:35,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:35,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:35,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:35,156 INFO L87 Difference]: Start difference. First operand 11144 states and 13702 transitions. Second operand 3 states. [2020-07-21 11:13:35,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:35,332 INFO L93 Difference]: Finished difference Result 25228 states and 30856 transitions. [2020-07-21 11:13:35,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:35,332 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 11:13:35,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:35,360 INFO L225 Difference]: With dead ends: 25228 [2020-07-21 11:13:35,361 INFO L226 Difference]: Without dead ends: 14218 [2020-07-21 11:13:35,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:35,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14218 states. [2020-07-21 11:13:35,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14218 to 14216. [2020-07-21 11:13:35,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14216 states. [2020-07-21 11:13:35,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14216 states to 14216 states and 16902 transitions. [2020-07-21 11:13:35,745 INFO L78 Accepts]: Start accepts. Automaton has 14216 states and 16902 transitions. Word has length 28 [2020-07-21 11:13:35,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:35,745 INFO L479 AbstractCegarLoop]: Abstraction has 14216 states and 16902 transitions. [2020-07-21 11:13:35,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:35,745 INFO L276 IsEmpty]: Start isEmpty. Operand 14216 states and 16902 transitions. [2020-07-21 11:13:35,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 11:13:35,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:35,760 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, 1, 1] [2020-07-21 11:13:35,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:35,975 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:35,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:35,976 INFO L82 PathProgramCache]: Analyzing trace with hash 690414627, now seen corresponding path program 1 times [2020-07-21 11:13:35,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:35,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592257413] [2020-07-21 11:13:35,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:36,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:36,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:36,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:36,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:36,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:36,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592257413] [2020-07-21 11:13:36,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:36,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:36,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100081341] [2020-07-21 11:13:36,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:36,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:36,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:36,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:36,031 INFO L87 Difference]: Start difference. First operand 14216 states and 16902 transitions. Second operand 3 states. [2020-07-21 11:13:36,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:36,193 INFO L93 Difference]: Finished difference Result 21516 states and 25608 transitions. [2020-07-21 11:13:36,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:36,194 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 11:13:36,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:36,228 INFO L225 Difference]: With dead ends: 21516 [2020-07-21 11:13:36,228 INFO L226 Difference]: Without dead ends: 14602 [2020-07-21 11:13:36,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:36,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14602 states. [2020-07-21 11:13:37,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14602 to 14600. [2020-07-21 11:13:37,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14600 states. [2020-07-21 11:13:37,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14600 states to 14600 states and 17158 transitions. [2020-07-21 11:13:37,025 INFO L78 Accepts]: Start accepts. Automaton has 14600 states and 17158 transitions. Word has length 29 [2020-07-21 11:13:37,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:37,025 INFO L479 AbstractCegarLoop]: Abstraction has 14600 states and 17158 transitions. [2020-07-21 11:13:37,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:37,026 INFO L276 IsEmpty]: Start isEmpty. Operand 14600 states and 17158 transitions. [2020-07-21 11:13:37,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 11:13:37,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:37,040 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, 1, 1] [2020-07-21 11:13:37,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:37,255 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:37,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:37,256 INFO L82 PathProgramCache]: Analyzing trace with hash -320702623, now seen corresponding path program 1 times [2020-07-21 11:13:37,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:37,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725075405] [2020-07-21 11:13:37,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:37,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:37,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:37,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:37,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:37,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:37,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725075405] [2020-07-21 11:13:37,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:37,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:37,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940447168] [2020-07-21 11:13:37,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:37,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:37,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:37,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:37,293 INFO L87 Difference]: Start difference. First operand 14600 states and 17158 transitions. Second operand 3 states. [2020-07-21 11:13:37,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:37,469 INFO L93 Difference]: Finished difference Result 23562 states and 27399 transitions. [2020-07-21 11:13:37,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:37,470 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 11:13:37,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:37,503 INFO L225 Difference]: With dead ends: 23562 [2020-07-21 11:13:37,503 INFO L226 Difference]: Without dead ends: 23560 [2020-07-21 11:13:37,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:37,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23560 states. [2020-07-21 11:13:37,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23560 to 22536. [2020-07-21 11:13:37,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22536 states. [2020-07-21 11:13:37,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22536 states to 22536 states and 25862 transitions. [2020-07-21 11:13:37,942 INFO L78 Accepts]: Start accepts. Automaton has 22536 states and 25862 transitions. Word has length 29 [2020-07-21 11:13:37,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:37,943 INFO L479 AbstractCegarLoop]: Abstraction has 22536 states and 25862 transitions. [2020-07-21 11:13:37,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:37,943 INFO L276 IsEmpty]: Start isEmpty. Operand 22536 states and 25862 transitions. [2020-07-21 11:13:37,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 11:13:37,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:13:37,969 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, 1, 1] [2020-07-21 11:13:38,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:38,183 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:13:38,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:13:38,183 INFO L82 PathProgramCache]: Analyzing trace with hash -907508637, now seen corresponding path program 1 times [2020-07-21 11:13:38,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:13:38,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210178083] [2020-07-21 11:13:38,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:38,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:13:38,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:13:38,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:13:38,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:13:38,230 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:13:38,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210178083] [2020-07-21 11:13:38,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:13:38,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:13:38,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055434358] [2020-07-21 11:13:38,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:13:38,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:13:38,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:13:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:38,231 INFO L87 Difference]: Start difference. First operand 22536 states and 25862 transitions. Second operand 3 states. [2020-07-21 11:13:38,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:13:38,611 INFO L93 Difference]: Finished difference Result 50184 states and 56582 transitions. [2020-07-21 11:13:38,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:13:38,612 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 11:13:38,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:13:38,612 INFO L225 Difference]: With dead ends: 50184 [2020-07-21 11:13:38,612 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 11:13:38,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:13:38,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 11:13:38,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 11:13:38,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 11:13:38,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 11:13:38,667 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-21 11:13:38,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:13:38,667 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 11:13:38,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:13:38,667 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 11:13:38,667 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 11:13:38,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:13:38,886 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 11:13:38,959 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 11:13:38,959 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:13:38,959 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:13:38,959 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 11:13:38,959 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 11:13:38,959 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 11:13:38,960 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-21 11:13:38,960 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-21 11:13:38,960 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,960 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,960 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,961 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-21 11:13:38,961 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-21 11:13:38,962 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-21 11:13:38,962 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-21 11:13:38,962 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-21 11:13:38,962 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-21 11:13:38,963 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,964 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,965 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 11:13:38,966 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-21 11:13:38,966 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-21 11:13:38,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:13:38 BoogieIcfgContainer [2020-07-21 11:13:38,984 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:13:38,993 INFO L168 Benchmark]: Toolchain (without parser) took 14808.16 ms. Allocated memory was 138.4 MB in the beginning and 574.6 MB in the end (delta: 436.2 MB). Free memory was 103.6 MB in the beginning and 401.9 MB in the end (delta: -298.4 MB). Peak memory consumption was 137.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:13:38,995 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 11:13:38,996 INFO L168 Benchmark]: CACSL2BoogieTranslator took 320.09 ms. Allocated memory is still 138.4 MB. Free memory was 103.1 MB in the beginning and 92.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:13:38,997 INFO L168 Benchmark]: Boogie Preprocessor took 141.62 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 179.5 MB in the end (delta: -87.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-21 11:13:38,997 INFO L168 Benchmark]: RCFGBuilder took 452.04 ms. Allocated memory is still 201.3 MB. Free memory was 179.5 MB in the beginning and 159.7 MB in the end (delta: 19.8 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. [2020-07-21 11:13:38,997 INFO L168 Benchmark]: TraceAbstraction took 13886.94 ms. Allocated memory was 201.3 MB in the beginning and 574.6 MB in the end (delta: 373.3 MB). Free memory was 159.7 MB in the beginning and 401.9 MB in the end (delta: -242.2 MB). Peak memory consumption was 131.1 MB. Max. memory is 7.1 GB. [2020-07-21 11:13:39,000 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 320.09 ms. Allocated memory is still 138.4 MB. Free memory was 103.1 MB in the beginning and 92.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 141.62 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 179.5 MB in the end (delta: -87.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 452.04 ms. Allocated memory is still 201.3 MB. Free memory was 179.5 MB in the beginning and 159.7 MB in the end (delta: 19.8 MB). Peak memory consumption was 19.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13886.94 ms. Allocated memory was 201.3 MB in the beginning and 574.6 MB in the end (delta: 373.3 MB). Free memory was 159.7 MB in the beginning and 401.9 MB in the end (delta: -242.2 MB). Peak memory consumption was 131.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 161]: 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: 39]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 13.7s, OverallIterations: 28, TraceHistogramMax: 1, AutomataDifference: 2.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2384 SDtfs, 1153 SDslu, 1624 SDs, 0 SdLazy, 149 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 659 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22536occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 3.0s AutomataMinimizationTime, 28 MinimizatonAttempts, 4124 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 687 NumberOfCodeBlocks, 687 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 659 ConstructedInterpolants, 0 QuantifiedInterpolants, 31265 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3128 ConjunctsInSsa, 84 ConjunctsInUnsatCore, 28 InterpolantComputations, 28 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...