/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 BIGGEST_EQUIVALENCE_CLASS --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 [2020-07-21 00:52:08,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:52:08,170 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:52:08,186 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:52:08,187 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:52:08,189 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:52:08,192 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:52:08,197 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:52:08,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:52:08,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:52:08,214 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:52:08,215 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:52:08,217 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:52:08,220 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:52:08,222 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:52:08,225 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:52:08,226 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:52:08,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:52:08,233 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:52:08,236 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:52:08,239 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:52:08,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:52:08,247 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:52:08,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:52:08,254 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:52:08,274 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 00:52:08,275 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 00:52:08,277 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 00:52:08,278 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 00:52:08,312 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:52:08,312 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:52:08,314 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:52:08,314 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:52:08,314 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:52:08,314 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:52:08,314 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:52:08,315 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:52:08,315 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:52:08,315 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:52:08,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:52:08,320 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:52:08,321 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:52:08,321 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:52:08,321 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:52:08,321 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:52:08,321 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:52:08,322 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:52:08,322 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:52:08,322 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:52:08,325 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:52:08,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:52:08,326 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:52:08,326 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:52:08,326 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:52:08,327 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:52:08,327 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:08,327 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:52:08,327 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:52:08,327 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:52:08,708 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:52:08,726 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:52:08,731 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:52:08,733 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:52:08,734 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:52:08,735 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 00:52:08,821 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a204c884e/a69b3b9c04864f92a362a076728d286f/FLAGcb4d62d5a [2020-07-21 00:52:09,299 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:52:09,300 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 00:52:09,309 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a204c884e/a69b3b9c04864f92a362a076728d286f/FLAGcb4d62d5a [2020-07-21 00:52:09,688 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a204c884e/a69b3b9c04864f92a362a076728d286f [2020-07-21 00:52:09,698 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:52:09,701 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:52:09,702 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:52:09,702 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:52:09,706 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:52:09,708 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:09" (1/1) ... [2020-07-21 00:52:09,711 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39cfa74d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:09, skipping insertion in model container [2020-07-21 00:52:09,711 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:09" (1/1) ... [2020-07-21 00:52:09,719 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:52:09,739 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:52:09,955 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:52:09,961 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:52:09,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:52:10,000 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:52:10,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10 WrapperNode [2020-07-21 00:52:10,001 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:52:10,002 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:52:10,003 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:52:10,003 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:52:10,020 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,028 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,029 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,034 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,037 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,038 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (1/1) ... [2020-07-21 00:52:10,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:52:10,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:52:10,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:52:10,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:52:10,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (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 00:52:10,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:52:10,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:52:10,216 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 00:52:10,216 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 00:52:10,216 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:52:10,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:52:10,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:52:10,217 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 00:52:10,217 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 00:52:10,217 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:52:10,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:52:10,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:52:10,455 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:52:10,456 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:52:10,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:10 BoogieIcfgContainer [2020-07-21 00:52:10,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:52:10,478 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:52:10,479 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:52:10,491 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:52:10,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:52:09" (1/3) ... [2020-07-21 00:52:10,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6023eb5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:10, skipping insertion in model container [2020-07-21 00:52:10,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:10" (2/3) ... [2020-07-21 00:52:10,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6023eb5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:10, skipping insertion in model container [2020-07-21 00:52:10,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:10" (3/3) ... [2020-07-21 00:52:10,504 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2020-07-21 00:52:10,521 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:52:10,531 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:52:10,572 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:52:10,600 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:52:10,600 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:52:10,601 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:52:10,601 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:52:10,601 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:52:10,602 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:52:10,602 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:52:10,602 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:52:10,625 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-21 00:52:10,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:52:10,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:10,635 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:10,636 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:10,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:10,645 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-07-21 00:52:10,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:10,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644949909] [2020-07-21 00:52:10,655 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 [2020-07-21 00:52:10,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:52:10,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:10,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:52:10,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:10,840 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 00:52:10,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:52:10,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644949909] [2020-07-21 00:52:10,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:52:10,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:52:10,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112937801] [2020-07-21 00:52:10,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:52:10,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:10,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:52:10,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:52:10,869 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-07-21 00:52:10,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:10,979 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 00:52:10,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:52:10,981 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:52:10,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:10,994 INFO L225 Difference]: With dead ends: 36 [2020-07-21 00:52:10,994 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 00:52:10,999 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 [2020-07-21 00:52:11,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 00:52:11,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 00:52:11,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 00:52:11,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-21 00:52:11,057 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-07-21 00:52:11,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:11,058 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-21 00:52:11,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:52:11,058 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-21 00:52:11,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 00:52:11,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:11,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:52:11,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:11,277 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:11,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:11,279 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-07-21 00:52:11,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:11,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40918216] [2020-07-21 00:52:11,280 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 [2020-07-21 00:52:11,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:52:11,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:11,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:52:11,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:11,394 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 00:52:11,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:52:11,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40918216] [2020-07-21 00:52:11,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:52:11,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 00:52:11,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073358600] [2020-07-21 00:52:11,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 00:52:11,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:11,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 00:52:11,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 00:52:11,400 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-07-21 00:52:11,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:11,539 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-07-21 00:52:11,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:52:11,541 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-21 00:52:11,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:11,543 INFO L225 Difference]: With dead ends: 33 [2020-07-21 00:52:11,543 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 00:52:11,545 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 [2020-07-21 00:52:11,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 00:52:11,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-07-21 00:52:11,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 00:52:11,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-21 00:52:11,569 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-07-21 00:52:11,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:11,571 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-21 00:52:11,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 00:52:11,573 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-21 00:52:11,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 00:52:11,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:11,578 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] [2020-07-21 00:52:11,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:11,795 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:11,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:11,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-07-21 00:52:11,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:11,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974095436] [2020-07-21 00:52:11,798 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 [2020-07-21 00:52:11,827 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:52:11,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:11,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:52:11,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:11,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:52:11,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:12,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:12,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:12,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:12,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:12,468 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 00:52:12,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974095436] [2020-07-21 00:52:12,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:12,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 00:52:12,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299673621] [2020-07-21 00:52:12,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:52:12,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:12,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:52:12,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:52:12,482 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-07-21 00:52:12,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:12,663 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-21 00:52:12,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:52:12,664 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-07-21 00:52:12,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:12,666 INFO L225 Difference]: With dead ends: 39 [2020-07-21 00:52:12,666 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 00:52:12,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:52:12,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 00:52:12,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-21 00:52:12,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 00:52:12,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-21 00:52:12,682 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-07-21 00:52:12,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:12,684 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-21 00:52:12,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:52:12,685 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-21 00:52:12,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 00:52:12,689 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:12,689 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] [2020-07-21 00:52:12,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:12,905 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:12,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:12,906 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-07-21 00:52:12,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:12,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539334483] [2020-07-21 00:52:12,907 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 [2020-07-21 00:52:12,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:52:12,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:12,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:52:12,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:13,040 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:52:13,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:13,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:13,691 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 00:52:13,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539334483] [2020-07-21 00:52:13,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:13,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 00:52:13,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328460351] [2020-07-21 00:52:13,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 00:52:13,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:13,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 00:52:13,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:52:13,695 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-07-21 00:52:13,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:13,826 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-07-21 00:52:13,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:52:13,830 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 00:52:13,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:13,834 INFO L225 Difference]: With dead ends: 45 [2020-07-21 00:52:13,835 INFO L226 Difference]: Without dead ends: 41 [2020-07-21 00:52:13,836 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 [2020-07-21 00:52:13,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-21 00:52:13,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-21 00:52:13,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 00:52:13,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-21 00:52:13,860 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-07-21 00:52:13,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:13,860 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-21 00:52:13,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 00:52:13,861 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-21 00:52:13,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 00:52:13,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:13,866 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] [2020-07-21 00:52:14,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:14,081 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:14,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:14,082 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-07-21 00:52:14,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:14,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015722459] [2020-07-21 00:52:14,083 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 [2020-07-21 00:52:14,115 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:52:14,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:14,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:52:14,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:14,194 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 00:52:14,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:14,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:14,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:15,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:15,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:15,176 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:52:15,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015722459] [2020-07-21 00:52:15,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:15,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 00:52:15,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436735803] [2020-07-21 00:52:15,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:52:15,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:15,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:52:15,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:52:15,181 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-07-21 00:52:15,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:15,361 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-07-21 00:52:15,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:52:15,363 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 00:52:15,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:15,365 INFO L225 Difference]: With dead ends: 51 [2020-07-21 00:52:15,365 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 00:52:15,366 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 [2020-07-21 00:52:15,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 00:52:15,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-07-21 00:52:15,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:52:15,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-21 00:52:15,375 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-07-21 00:52:15,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:15,375 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-21 00:52:15,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:52:15,376 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-21 00:52:15,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 00:52:15,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:15,377 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] [2020-07-21 00:52:15,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:15,579 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:15,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:15,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-07-21 00:52:15,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:15,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830428596] [2020-07-21 00:52:15,582 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 [2020-07-21 00:52:15,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 00:52:15,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:15,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 00:52:15,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:15,838 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 00:52:15,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:16,254 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 00:52:16,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1830428596] [2020-07-21 00:52:16,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:16,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2020-07-21 00:52:16,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010189502] [2020-07-21 00:52:16,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:52:16,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:16,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:52:16,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:52:16,258 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 15 states. [2020-07-21 00:52:16,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:16,390 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-07-21 00:52:16,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:52:16,390 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-07-21 00:52:16,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:16,396 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:52:16,397 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:52:16,398 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 [2020-07-21 00:52:16,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:52:16,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2020-07-21 00:52:16,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 00:52:16,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-07-21 00:52:16,415 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 43 [2020-07-21 00:52:16,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:16,416 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-07-21 00:52:16,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:52:16,416 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-07-21 00:52:16,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 00:52:16,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:16,426 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] [2020-07-21 00:52:16,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:16,643 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:16,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:16,643 INFO L82 PathProgramCache]: Analyzing trace with hash 706413819, now seen corresponding path program 3 times [2020-07-21 00:52:16,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:16,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419011506] [2020-07-21 00:52:16,645 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 [2020-07-21 00:52:16,690 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:52:16,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:16,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:52:16,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 00:52:16,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:52:16,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419011506] [2020-07-21 00:52:16,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:52:16,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-21 00:52:16,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001637628] [2020-07-21 00:52:16,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 00:52:16,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:16,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 00:52:16,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 00:52:16,800 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2020-07-21 00:52:16,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:16,979 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2020-07-21 00:52:16,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:52:16,981 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-07-21 00:52:16,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:16,983 INFO L225 Difference]: With dead ends: 63 [2020-07-21 00:52:16,983 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 00:52:16,985 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 [2020-07-21 00:52:16,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 00:52:16,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 00:52:16,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 00:52:16,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 00:52:16,992 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 49 [2020-07-21 00:52:16,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:16,993 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 00:52:16,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 00:52:16,993 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 00:52:16,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 00:52:16,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:52:16,994 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] [2020-07-21 00:52:17,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:17,201 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:52:17,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:52:17,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1492956279, now seen corresponding path program 3 times [2020-07-21 00:52:17,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:52:17,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443980403] [2020-07-21 00:52:17,203 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 [2020-07-21 00:52:17,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:52:17,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:52:17,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 00:52:17,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:52:17,369 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 15 proven. 29 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-21 00:52:17,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:52:18,169 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 15 proven. 39 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 00:52:18,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443980403] [2020-07-21 00:52:18,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:52:18,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 00:52:18,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801495909] [2020-07-21 00:52:18,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:52:18,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:52:18,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:52:18,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:52:18,172 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 17 states. [2020-07-21 00:52:18,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:52:18,573 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2020-07-21 00:52:18,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 00:52:18,579 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 55 [2020-07-21 00:52:18,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:52:18,580 INFO L225 Difference]: With dead ends: 61 [2020-07-21 00:52:18,580 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 00:52:18,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=151, Invalid=661, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:52:18,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 00:52:18,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 00:52:18,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 00:52:18,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 00:52:18,583 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 55 [2020-07-21 00:52:18,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:52:18,584 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 00:52:18,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:52:18,584 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 00:52:18,584 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 00:52:18,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:52:18,789 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 00:52:18,964 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 00:52:18,964 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:52:18,964 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (not (= 0 |id2_#in~x|)) (= id2_~x |id2_#in~x|)) [2020-07-21 00:52:18,965 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 00:52:18,965 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-21 00:52:18,965 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 12 15) no Hoare annotation was computed. [2020-07-21 00:52:18,965 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 12 15) the Hoare annotation is: true [2020-07-21 00:52:18,965 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 12 15) no Hoare annotation was computed. [2020-07-21 00:52:18,965 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 00:52:18,966 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 00:52:18,966 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 00:52:18,966 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 00:52:18,966 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 21) no Hoare annotation was computed. [2020-07-21 00:52:18,967 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 23) the Hoare annotation is: true [2020-07-21 00:52:18,967 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 23) no Hoare annotation was computed. [2020-07-21 00:52:18,967 INFO L268 CegarLoopResult]: For program point L21(line 21) no Hoare annotation was computed. [2020-07-21 00:52:18,967 INFO L268 CegarLoopResult]: For program point L20(lines 20 22) no Hoare annotation was computed. [2020-07-21 00:52:18,967 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (= 5 main_~input~0) [2020-07-21 00:52:18,967 INFO L268 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2020-07-21 00:52:18,967 INFO L268 CegarLoopResult]: For program point L20-2(lines 17 23) no Hoare annotation was computed. [2020-07-21 00:52:18,968 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 10) no Hoare annotation was computed. [2020-07-21 00:52:18,968 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 10) no Hoare annotation was computed. [2020-07-21 00:52:18,968 INFO L264 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: (= |id_#in~x| id_~x) [2020-07-21 00:52:18,968 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 00:52:18,968 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 00:52:18,969 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 10) the Hoare annotation is: true [2020-07-21 00:52:18,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:52:18 BoogieIcfgContainer [2020-07-21 00:52:18,978 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 00:52:18,982 INFO L168 Benchmark]: Toolchain (without parser) took 9281.14 ms. Allocated memory was 137.9 MB in the beginning and 282.6 MB in the end (delta: 144.7 MB). Free memory was 102.8 MB in the beginning and 130.6 MB in the end (delta: -27.8 MB). Peak memory consumption was 116.9 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,983 INFO L168 Benchmark]: CDTParser took 0.39 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,984 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.4 MB in the beginning and 92.6 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,985 INFO L168 Benchmark]: Boogie Preprocessor took 38.14 ms. Allocated memory is still 137.9 MB. Free memory was 92.6 MB in the beginning and 91.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,986 INFO L168 Benchmark]: RCFGBuilder took 432.42 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.1 MB in the beginning and 170.1 MB in the end (delta: -79.0 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,987 INFO L168 Benchmark]: TraceAbstraction took 8499.90 ms. Allocated memory was 202.4 MB in the beginning and 282.6 MB in the end (delta: 80.2 MB). Free memory was 169.5 MB in the beginning and 130.6 MB in the end (delta: 38.9 MB). Peak memory consumption was 119.1 MB. Max. memory is 7.1 GB. [2020-07-21 00:52:18,991 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.4 MB in the beginning and 92.6 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 38.14 ms. Allocated memory is still 137.9 MB. Free memory was 92.6 MB in the beginning and 91.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 432.42 ms. Allocated memory was 137.9 MB in the beginning and 202.4 MB in the end (delta: 64.5 MB). Free memory was 91.1 MB in the beginning and 170.1 MB in the end (delta: -79.0 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8499.90 ms. Allocated memory was 202.4 MB in the beginning and 282.6 MB in the end (delta: 80.2 MB). Free memory was 169.5 MB in the beginning and 130.6 MB in the end (delta: 38.9 MB). Peak memory consumption was 119.1 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: 8.1s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 177 SDtfs, 149 SDslu, 1195 SDs, 0 SdLazy, 644 SolverSat, 48 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 493 GetRequests, 351 SyntacticMatches, 27 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 1.6s 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, 17 PreInvPairs, 17 NumberOfFragments, 20 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 106 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 4.2s InterpolantComputationTime, 272 NumberOfCodeBlocks, 178 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 450 ConstructedInterpolants, 0 QuantifiedInterpolants, 45966 SizeOfPredicates, 34 NumberOfNonLiveVariables, 435 ConjunctsInSsa, 110 ConjunctsInUnsatCore, 13 InterpolantComputations, 3 PerfectInterpolantSequences, 168/312 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...