/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:56:38,842 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:56:38,850 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:56:38,867 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:56:38,868 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:56:38,869 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:56:38,870 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:56:38,872 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:56:38,874 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:56:38,875 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:56:38,876 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:56:38,877 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:56:38,878 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:56:38,879 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:56:38,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:56:38,881 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:56:38,882 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:56:38,883 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:56:38,885 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:56:38,887 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:56:38,889 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:56:38,890 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:56:38,891 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:56:38,892 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:56:38,896 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:56:38,904 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:56:38,905 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:56:38,906 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:56:38,907 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:56:38,926 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:56:38,926 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:56:38,929 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:56:38,929 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:56:38,929 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:56:38,930 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:56:38,930 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:56:38,930 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:56:38,931 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:56:38,931 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:56:38,932 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:56:38,932 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:56:38,932 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:56:38,932 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:56:38,932 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:56:38,933 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:56:38,933 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:56:38,933 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:56:38,933 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:56:38,934 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:56:38,934 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:56:38,934 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:38,934 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:56:38,934 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:56:38,935 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:56:38,935 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:56:38,935 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:38,935 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:56:38,935 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:56:38,936 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:56:39,217 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:56:39,230 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:56:39,234 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:56:39,235 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:56:39,235 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:56:39,236 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-20 16:56:39,297 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db8c31f6b/4ba11a1d564b4359b64ef182822019bf/FLAGe027c14f7 [2020-07-20 16:56:39,789 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:56:39,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-20 16:56:39,799 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db8c31f6b/4ba11a1d564b4359b64ef182822019bf/FLAGe027c14f7 [2020-07-20 16:56:40,131 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/db8c31f6b/4ba11a1d564b4359b64ef182822019bf [2020-07-20 16:56:40,141 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:56:40,144 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:56:40,146 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:40,146 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:56:40,152 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:56:40,153 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,157 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f318255 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40, skipping insertion in model container [2020-07-20 16:56:40,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,168 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:56:40,187 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:56:40,374 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:40,380 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:56:40,398 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:56:40,415 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:56:40,416 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40 WrapperNode [2020-07-20 16:56:40,416 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:56:40,417 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:56:40,417 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:56:40,417 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:56:40,433 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,434 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,440 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,440 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,445 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,447 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... [2020-07-20 16:56:40,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:56:40,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:56:40,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:56:40,451 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:56:40,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:56:40,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:56:40,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:56:40,622 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 16:56:40,622 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-20 16:56:40,622 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:56:40,623 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:56:40,623 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:56:40,623 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 16:56:40,623 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-20 16:56:40,623 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:56:40,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:56:40,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:56:40,849 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:56:40,850 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:56:40,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:40 BoogieIcfgContainer [2020-07-20 16:56:40,863 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:56:40,868 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:56:40,868 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:56:40,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:56:40,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:56:40" (1/3) ... [2020-07-20 16:56:40,881 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57332ad2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:40, skipping insertion in model container [2020-07-20 16:56:40,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:56:40" (2/3) ... [2020-07-20 16:56:40,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57332ad2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:56:40, skipping insertion in model container [2020-07-20 16:56:40,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:56:40" (3/3) ... [2020-07-20 16:56:40,888 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2020-07-20 16:56:40,913 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:56:40,922 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:56:40,940 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:56:40,969 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:56:40,969 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:56:40,969 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:56:40,969 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:56:40,970 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:56:40,970 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:56:40,970 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:56:40,970 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:56:40,997 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-20 16:56:41,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:56:41,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:41,008 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:41,009 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:41,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:41,014 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-07-20 16:56:41,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:41,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149593881] [2020-07-20 16:56:41,023 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:41,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:41,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:41,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:56:41,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:41,191 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:56:41,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:41,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149593881] [2020-07-20 16:56:41,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:41,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:56:41,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942260099] [2020-07-20 16:56:41,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:56:41,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:41,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:56:41,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:56:41,218 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-07-20 16:56:41,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:41,316 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-20 16:56:41,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:56:41,318 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:56:41,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:41,329 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:56:41,330 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:56:41,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:56:41,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:56:41,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:56:41,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:56:41,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-20 16:56:41,387 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-07-20 16:56:41,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:41,388 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-20 16:56:41,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:56:41,389 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-20 16:56:41,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:56:41,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:41,391 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:41,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:41,608 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:41,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:41,609 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-07-20 16:56:41,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:41,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994405279] [2020-07-20 16:56:41,611 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:41,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:41,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:41,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:56:41,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:41,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:56:41,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:41,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994405279] [2020-07-20 16:56:41,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:41,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 16:56:41,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162727105] [2020-07-20 16:56:41,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:56:41,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:41,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:56:41,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:56:41,723 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-07-20 16:56:41,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:41,818 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-07-20 16:56:41,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:56:41,819 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-20 16:56:41,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:41,820 INFO L225 Difference]: With dead ends: 33 [2020-07-20 16:56:41,821 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 16:56:41,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:56:41,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 16:56:41,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-07-20 16:56:41,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 16:56:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-20 16:56:41,831 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-07-20 16:56:41,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:41,832 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-20 16:56:41,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:56:41,832 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-20 16:56:41,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 16:56:41,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:41,834 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:42,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:42,050 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:42,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:42,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-07-20 16:56:42,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:42,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006590119] [2020-07-20 16:56:42,054 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:42,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:42,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:42,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:56:42,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:42,166 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:56:42,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:42,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:42,554 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:56:42,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006590119] [2020-07-20 16:56:42,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:42,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:56:42,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8780755] [2020-07-20 16:56:42,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:42,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:42,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:42,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:42,558 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-07-20 16:56:42,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:42,706 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-20 16:56:42,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:56:42,707 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-07-20 16:56:42,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:42,710 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:56:42,710 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 16:56:42,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:42,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 16:56:42,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-20 16:56:42,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:56:42,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-20 16:56:42,728 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-07-20 16:56:42,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:42,729 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-20 16:56:42,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:42,730 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-20 16:56:42,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:56:42,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:42,734 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:42,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:42,947 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:42,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:42,948 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-07-20 16:56:42,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:42,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955085137] [2020-07-20 16:56:42,950 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:43,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:43,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:43,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:56:43,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:43,083 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:56:43,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:43,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:43,709 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:56:43,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955085137] [2020-07-20 16:56:43,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:43,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:56:43,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047399269] [2020-07-20 16:56:43,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:56:43,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:43,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:56:43,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:56:43,716 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-07-20 16:56:43,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:43,840 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-07-20 16:56:43,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:56:43,841 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-20 16:56:43,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:43,842 INFO L225 Difference]: With dead ends: 45 [2020-07-20 16:56:43,842 INFO L226 Difference]: Without dead ends: 41 [2020-07-20 16:56:43,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:56:43,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-20 16:56:43,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-20 16:56:43,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 16:56:43,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-20 16:56:43,850 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-07-20 16:56:43,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:43,850 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-20 16:56:43,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:56:43,850 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-20 16:56:43,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 16:56:43,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:43,852 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:44,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:44,053 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:44,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:44,054 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-07-20 16:56:44,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:44,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822578665] [2020-07-20 16:56:44,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:44,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:44,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:44,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:56:44,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:44,173 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 16:56:44,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:44,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:44,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:45,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:45,063 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:56:45,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822578665] [2020-07-20 16:56:45,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:45,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:56:45,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672292970] [2020-07-20 16:56:45,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:56:45,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:45,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:56:45,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:45,066 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-07-20 16:56:45,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:45,220 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-07-20 16:56:45,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:56:45,224 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 16:56:45,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:45,225 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:56:45,225 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:56:45,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 49 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:56:45,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:56:45,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-07-20 16:56:45,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:56:45,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-20 16:56:45,234 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-07-20 16:56:45,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:45,235 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-20 16:56:45,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:56:45,235 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-20 16:56:45,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 16:56:45,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:45,236 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:45,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:45,438 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:45,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:45,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-07-20 16:56:45,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:45,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463007931] [2020-07-20 16:56:45,441 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:45,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:56:45,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:45,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 16:56:45,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:45,655 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 16:56:45,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:46,046 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 16:56:46,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463007931] [2020-07-20 16:56:46,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:46,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2020-07-20 16:56:46,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104486399] [2020-07-20 16:56:46,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:56:46,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:46,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:56:46,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:46,049 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 15 states. [2020-07-20 16:56:46,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:46,160 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-07-20 16:56:46,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:56:46,161 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-07-20 16:56:46,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:46,162 INFO L225 Difference]: With dead ends: 57 [2020-07-20 16:56:46,163 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 16:56:46,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:56:46,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 16:56:46,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2020-07-20 16:56:46,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 16:56:46,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-07-20 16:56:46,184 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 43 [2020-07-20 16:56:46,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:46,186 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-07-20 16:56:46,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:56:46,186 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-07-20 16:56:46,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 16:56:46,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:46,188 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:46,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,407 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:46,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:46,407 INFO L82 PathProgramCache]: Analyzing trace with hash 706413819, now seen corresponding path program 3 times [2020-07-20 16:56:46,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:46,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1188404617] [2020-07-20 16:56:46,408 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:46,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:46,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:56:46,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:46,542 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:56:46,543 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:46,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1188404617] [2020-07-20 16:56:46,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:46,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-20 16:56:46,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027412327] [2020-07-20 16:56:46,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:56:46,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:46,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:56:46,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:56:46,545 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2020-07-20 16:56:46,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:46,708 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2020-07-20 16:56:46,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:56:46,710 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-07-20 16:56:46,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:46,711 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:56:46,711 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 16:56:46,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:46,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 16:56:46,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 16:56:46,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 16:56:46,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 16:56:46,723 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 49 [2020-07-20 16:56:46,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:46,723 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 16:56:46,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:56:46,724 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 16:56:46,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 16:56:46,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:46,725 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:46,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,926 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:46,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:46,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1492956279, now seen corresponding path program 3 times [2020-07-20 16:56:46,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:46,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269964771] [2020-07-20 16:56:46,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:46,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:46,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:46,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:46,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:47,092 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2020-07-20 16:56:47,092 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:56:47,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269964771] [2020-07-20 16:56:47,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:56:47,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-07-20 16:56:47,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903226928] [2020-07-20 16:56:47,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:56:47,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:47,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:56:47,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:56:47,095 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-07-20 16:56:47,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:47,261 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2020-07-20 16:56:47,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:56:47,262 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-07-20 16:56:47,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:47,263 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:56:47,263 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:56:47,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:56:47,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:56:47,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:56:47,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:56:47,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:56:47,266 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 55 [2020-07-20 16:56:47,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:47,266 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:56:47,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:56:47,267 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:56:47,267 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:56:47,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:47,472 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:56:47,570 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:56:47,571 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:56:47,571 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (<= |id2_#in~x| id2_~x) (<= id2_~x |id2_#in~x|)) [2020-07-20 16:56:47,571 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-20 16:56:47,571 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-20 16:56:47,571 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 12 15) no Hoare annotation was computed. [2020-07-20 16:56:47,572 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 12 15) the Hoare annotation is: true [2020-07-20 16:56:47,572 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 12 15) no Hoare annotation was computed. [2020-07-20 16:56:47,572 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:56:47,572 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:56:47,573 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:56:47,573 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:56:47,573 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 21) no Hoare annotation was computed. [2020-07-20 16:56:47,574 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 23) the Hoare annotation is: true [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 23) no Hoare annotation was computed. [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point L21(line 21) no Hoare annotation was computed. [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point L20(lines 20 22) no Hoare annotation was computed. [2020-07-20 16:56:47,575 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (<= main_~input~0 5) (<= 5 main_~input~0)) [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point L20-2(lines 17 23) no Hoare annotation was computed. [2020-07-20 16:56:47,575 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 10) no Hoare annotation was computed. [2020-07-20 16:56:47,576 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 10) no Hoare annotation was computed. [2020-07-20 16:56:47,576 INFO L264 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-20 16:56:47,576 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-20 16:56:47,576 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-20 16:56:47,576 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 10) the Hoare annotation is: true [2020-07-20 16:56:47,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:56:47 BoogieIcfgContainer [2020-07-20 16:56:47,583 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:56:47,586 INFO L168 Benchmark]: Toolchain (without parser) took 7442.59 ms. Allocated memory was 144.2 MB in the beginning and 274.7 MB in the end (delta: 130.5 MB). Free memory was 101.5 MB in the beginning and 97.6 MB in the end (delta: 4.0 MB). Peak memory consumption was 134.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,588 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 144.2 MB. Free memory was 119.1 MB in the beginning and 118.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,589 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.74 ms. Allocated memory is still 144.2 MB. Free memory was 101.1 MB in the beginning and 91.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,590 INFO L168 Benchmark]: Boogie Preprocessor took 33.38 ms. Allocated memory is still 144.2 MB. Free memory was 91.3 MB in the beginning and 89.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,591 INFO L168 Benchmark]: RCFGBuilder took 412.15 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 89.9 MB in the beginning and 169.5 MB in the end (delta: -79.6 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,592 INFO L168 Benchmark]: TraceAbstraction took 6715.82 ms. Allocated memory was 201.9 MB in the beginning and 274.7 MB in the end (delta: 72.9 MB). Free memory was 168.9 MB in the beginning and 97.6 MB in the end (delta: 71.3 MB). Peak memory consumption was 144.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:47,596 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 144.2 MB. Free memory was 119.1 MB in the beginning and 118.9 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.74 ms. Allocated memory is still 144.2 MB. Free memory was 101.1 MB in the beginning and 91.3 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.38 ms. Allocated memory is still 144.2 MB. Free memory was 91.3 MB in the beginning and 89.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 412.15 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 89.9 MB in the beginning and 169.5 MB in the end (delta: -79.6 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6715.82 ms. Allocated memory was 201.9 MB in the beginning and 274.7 MB in the end (delta: 72.9 MB). Free memory was 168.9 MB in the beginning and 97.6 MB in the end (delta: 71.3 MB). Peak memory consumption was 144.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 21]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.5s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 179 SDtfs, 130 SDslu, 1108 SDs, 0 SdLazy, 510 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 430 GetRequests, 296 SyntacticMatches, 27 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 40 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 27 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.0s InterpolantComputationTime, 272 NumberOfCodeBlocks, 226 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 396 ConstructedInterpolants, 0 QuantifiedInterpolants, 35544 SizeOfPredicates, 37 NumberOfNonLiveVariables, 594 ConjunctsInSsa, 101 ConjunctsInUnsatCore, 12 InterpolantComputations, 4 PerfectInterpolantSequences, 170/246 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...